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Last commit 20 Feb 2019 by 
mbed official
targets/hal/TARGET_Atmel/TARGET_SAM21/drivers/sercom/i2c/i2c_samd21_r21_d10_d11_l21/i2c_master.c@579:53297373a894, 2015-07-01 (annotated)
- Committer:
- mbed_official
- Date:
- Wed Jul 01 09:45:11 2015 +0100
- Revision:
- 579:53297373a894
- Child:
- 592:a274ee790e56
Synchronized with git revision d5b4d2ab9c47edb4dc5776e7177b0c2263459081
Full URL: https://github.com/mbedmicro/mbed/commit/d5b4d2ab9c47edb4dc5776e7177b0c2263459081/
Initial version of drivers for SAMR21
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mbed_official | 579:53297373a894 | 1 | /** |
| mbed_official | 579:53297373a894 | 2 | * \file |
| mbed_official | 579:53297373a894 | 3 | * |
| mbed_official | 579:53297373a894 | 4 | * \brief SAM I2C Master Driver |
| mbed_official | 579:53297373a894 | 5 | * |
| mbed_official | 579:53297373a894 | 6 | * Copyright (C) 2012-2014 Atmel Corporation. All rights reserved. |
| mbed_official | 579:53297373a894 | 7 | * |
| mbed_official | 579:53297373a894 | 8 | * \asf_license_start |
| mbed_official | 579:53297373a894 | 9 | * |
| mbed_official | 579:53297373a894 | 10 | * \page License |
| mbed_official | 579:53297373a894 | 11 | * |
| mbed_official | 579:53297373a894 | 12 | * Redistribution and use in source and binary forms, with or without |
| mbed_official | 579:53297373a894 | 13 | * modification, are permitted provided that the following conditions are met: |
| mbed_official | 579:53297373a894 | 14 | * |
| mbed_official | 579:53297373a894 | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
| mbed_official | 579:53297373a894 | 16 | * this list of conditions and the following disclaimer. |
| mbed_official | 579:53297373a894 | 17 | * |
| mbed_official | 579:53297373a894 | 18 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| mbed_official | 579:53297373a894 | 19 | * this list of conditions and the following disclaimer in the documentation |
| mbed_official | 579:53297373a894 | 20 | * and/or other materials provided with the distribution. |
| mbed_official | 579:53297373a894 | 21 | * |
| mbed_official | 579:53297373a894 | 22 | * 3. The name of Atmel may not be used to endorse or promote products derived |
| mbed_official | 579:53297373a894 | 23 | * from this software without specific prior written permission. |
| mbed_official | 579:53297373a894 | 24 | * |
| mbed_official | 579:53297373a894 | 25 | * 4. This software may only be redistributed and used in connection with an |
| mbed_official | 579:53297373a894 | 26 | * Atmel microcontroller product. |
| mbed_official | 579:53297373a894 | 27 | * |
| mbed_official | 579:53297373a894 | 28 | * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED |
| mbed_official | 579:53297373a894 | 29 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| mbed_official | 579:53297373a894 | 30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE |
| mbed_official | 579:53297373a894 | 31 | * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR |
| mbed_official | 579:53297373a894 | 32 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| mbed_official | 579:53297373a894 | 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| mbed_official | 579:53297373a894 | 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| mbed_official | 579:53297373a894 | 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| mbed_official | 579:53297373a894 | 36 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| mbed_official | 579:53297373a894 | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| mbed_official | 579:53297373a894 | 38 | * POSSIBILITY OF SUCH DAMAGE. |
| mbed_official | 579:53297373a894 | 39 | * |
| mbed_official | 579:53297373a894 | 40 | * \asf_license_stop |
| mbed_official | 579:53297373a894 | 41 | * |
| mbed_official | 579:53297373a894 | 42 | */ |
| mbed_official | 579:53297373a894 | 43 | /** |
| mbed_official | 579:53297373a894 | 44 | * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> |
| mbed_official | 579:53297373a894 | 45 | */ |
| mbed_official | 579:53297373a894 | 46 | |
| mbed_official | 579:53297373a894 | 47 | #include "i2c_master.h" |
| mbed_official | 579:53297373a894 | 48 | |
| mbed_official | 579:53297373a894 | 49 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 50 | # include "i2c_master_interrupt.h" |
| mbed_official | 579:53297373a894 | 51 | #endif |
| mbed_official | 579:53297373a894 | 52 | |
| mbed_official | 579:53297373a894 | 53 | /* Forward declaration */ |
| mbed_official | 579:53297373a894 | 54 | enum status_code _i2c_master_wait_for_bus( |
| mbed_official | 579:53297373a894 | 55 | struct i2c_master_module *const module); |
| mbed_official | 579:53297373a894 | 56 | |
| mbed_official | 579:53297373a894 | 57 | enum status_code _i2c_master_address_response( |
| mbed_official | 579:53297373a894 | 58 | struct i2c_master_module *const module); |
| mbed_official | 579:53297373a894 | 59 | |
| mbed_official | 579:53297373a894 | 60 | enum status_code _i2c_master_send_hs_master_code( |
| mbed_official | 579:53297373a894 | 61 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 62 | uint8_t hs_master_code); |
| mbed_official | 579:53297373a894 | 63 | |
| mbed_official | 579:53297373a894 | 64 | #if !defined(__DOXYGEN__) |
| mbed_official | 579:53297373a894 | 65 | |
| mbed_official | 579:53297373a894 | 66 | /** |
| mbed_official | 579:53297373a894 | 67 | * \internal Sets configurations to module |
| mbed_official | 579:53297373a894 | 68 | * |
| mbed_official | 579:53297373a894 | 69 | * \param[out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 70 | * \param[in] config Configuration structure with configurations to set |
| mbed_official | 579:53297373a894 | 71 | * |
| mbed_official | 579:53297373a894 | 72 | * \return Status of setting configuration. |
| mbed_official | 579:53297373a894 | 73 | * \retval STATUS_OK If module was configured correctly |
| mbed_official | 579:53297373a894 | 74 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
| mbed_official | 579:53297373a894 | 75 | * previously set |
| mbed_official | 579:53297373a894 | 76 | * \retval STATUS_ERR_BAUDRATE_UNAVAILABLE If given baudrate is not compatible |
| mbed_official | 579:53297373a894 | 77 | * with set GCLK frequency |
| mbed_official | 579:53297373a894 | 78 | */ |
| mbed_official | 579:53297373a894 | 79 | static enum status_code _i2c_master_set_config( |
| mbed_official | 579:53297373a894 | 80 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 81 | const struct i2c_master_config *const config) |
| mbed_official | 579:53297373a894 | 82 | { |
| mbed_official | 579:53297373a894 | 83 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 84 | Assert(module); |
| mbed_official | 579:53297373a894 | 85 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 86 | Assert(config); |
| mbed_official | 579:53297373a894 | 87 | |
| mbed_official | 579:53297373a894 | 88 | /* Temporary variables. */ |
| mbed_official | 579:53297373a894 | 89 | uint32_t tmp_ctrla; |
| mbed_official | 579:53297373a894 | 90 | int32_t tmp_baud; |
| mbed_official | 579:53297373a894 | 91 | int32_t tmp_baud_hs; |
| mbed_official | 579:53297373a894 | 92 | enum status_code tmp_status_code = STATUS_OK; |
| mbed_official | 579:53297373a894 | 93 | |
| mbed_official | 579:53297373a894 | 94 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 95 | Sercom *const sercom_hw = module->hw; |
| mbed_official | 579:53297373a894 | 96 | |
| mbed_official | 579:53297373a894 | 97 | uint8_t sercom_index = _sercom_get_sercom_inst_index(sercom_hw); |
| mbed_official | 579:53297373a894 | 98 | |
| mbed_official | 579:53297373a894 | 99 | /* Pin configuration */ |
| mbed_official | 579:53297373a894 | 100 | struct system_pinmux_config pin_conf; |
| mbed_official | 579:53297373a894 | 101 | system_pinmux_get_config_defaults(&pin_conf); |
| mbed_official | 579:53297373a894 | 102 | |
| mbed_official | 579:53297373a894 | 103 | uint32_t pad0 = config->pinmux_pad0; |
| mbed_official | 579:53297373a894 | 104 | uint32_t pad1 = config->pinmux_pad1; |
| mbed_official | 579:53297373a894 | 105 | |
| mbed_official | 579:53297373a894 | 106 | /* SERCOM PAD0 - SDA */ |
| mbed_official | 579:53297373a894 | 107 | if (pad0 == PINMUX_DEFAULT) { |
| mbed_official | 579:53297373a894 | 108 | pad0 = _sercom_get_default_pad(sercom_hw, 0); |
| mbed_official | 579:53297373a894 | 109 | } |
| mbed_official | 579:53297373a894 | 110 | pin_conf.mux_position = pad0 & 0xFFFF; |
| mbed_official | 579:53297373a894 | 111 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
| mbed_official | 579:53297373a894 | 112 | system_pinmux_pin_set_config(pad0 >> 16, &pin_conf); |
| mbed_official | 579:53297373a894 | 113 | |
| mbed_official | 579:53297373a894 | 114 | /* SERCOM PAD1 - SCL */ |
| mbed_official | 579:53297373a894 | 115 | if (pad1 == PINMUX_DEFAULT) { |
| mbed_official | 579:53297373a894 | 116 | pad1 = _sercom_get_default_pad(sercom_hw, 1); |
| mbed_official | 579:53297373a894 | 117 | } |
| mbed_official | 579:53297373a894 | 118 | pin_conf.mux_position = pad1 & 0xFFFF; |
| mbed_official | 579:53297373a894 | 119 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
| mbed_official | 579:53297373a894 | 120 | system_pinmux_pin_set_config(pad1 >> 16, &pin_conf); |
| mbed_official | 579:53297373a894 | 121 | |
| mbed_official | 579:53297373a894 | 122 | /* Save timeout on unknown bus state in software module. */ |
| mbed_official | 579:53297373a894 | 123 | module->unknown_bus_state_timeout = config->unknown_bus_state_timeout; |
| mbed_official | 579:53297373a894 | 124 | |
| mbed_official | 579:53297373a894 | 125 | /* Save timeout on buffer write. */ |
| mbed_official | 579:53297373a894 | 126 | module->buffer_timeout = config->buffer_timeout; |
| mbed_official | 579:53297373a894 | 127 | |
| mbed_official | 579:53297373a894 | 128 | /* Set whether module should run in standby. */ |
| mbed_official | 579:53297373a894 | 129 | if (config->run_in_standby || system_is_debugger_present()) { |
| mbed_official | 579:53297373a894 | 130 | tmp_ctrla = SERCOM_I2CM_CTRLA_RUNSTDBY; |
| mbed_official | 579:53297373a894 | 131 | } else { |
| mbed_official | 579:53297373a894 | 132 | tmp_ctrla = 0; |
| mbed_official | 579:53297373a894 | 133 | } |
| mbed_official | 579:53297373a894 | 134 | |
| mbed_official | 579:53297373a894 | 135 | /* Check and set start data hold timeout. */ |
| mbed_official | 579:53297373a894 | 136 | if (config->start_hold_time != I2C_MASTER_START_HOLD_TIME_DISABLED) { |
| mbed_official | 579:53297373a894 | 137 | tmp_ctrla |= config->start_hold_time; |
| mbed_official | 579:53297373a894 | 138 | } |
| mbed_official | 579:53297373a894 | 139 | |
| mbed_official | 579:53297373a894 | 140 | /* Check and set transfer speed */ |
| mbed_official | 579:53297373a894 | 141 | tmp_ctrla |= config->transfer_speed; |
| mbed_official | 579:53297373a894 | 142 | |
| mbed_official | 579:53297373a894 | 143 | /* Check and set SCL low timeout. */ |
| mbed_official | 579:53297373a894 | 144 | if (config->scl_low_timeout) { |
| mbed_official | 579:53297373a894 | 145 | tmp_ctrla |= SERCOM_I2CM_CTRLA_LOWTOUTEN; |
| mbed_official | 579:53297373a894 | 146 | } |
| mbed_official | 579:53297373a894 | 147 | |
| mbed_official | 579:53297373a894 | 148 | /* Check and set inactive bus timeout. */ |
| mbed_official | 579:53297373a894 | 149 | if (config->inactive_timeout != I2C_MASTER_INACTIVE_TIMEOUT_DISABLED) { |
| mbed_official | 579:53297373a894 | 150 | tmp_ctrla |= config->inactive_timeout; |
| mbed_official | 579:53297373a894 | 151 | } |
| mbed_official | 579:53297373a894 | 152 | |
| mbed_official | 579:53297373a894 | 153 | /* Check and set SCL clock stretch mode. */ |
| mbed_official | 579:53297373a894 | 154 | if (config->scl_stretch_only_after_ack_bit) { |
| mbed_official | 579:53297373a894 | 155 | tmp_ctrla |= SERCOM_I2CM_CTRLA_SCLSM; |
| mbed_official | 579:53297373a894 | 156 | } |
| mbed_official | 579:53297373a894 | 157 | |
| mbed_official | 579:53297373a894 | 158 | /* Check and set slave SCL low extend timeout. */ |
| mbed_official | 579:53297373a894 | 159 | if (config->slave_scl_low_extend_timeout) { |
| mbed_official | 579:53297373a894 | 160 | tmp_ctrla |= SERCOM_I2CM_CTRLA_SEXTTOEN; |
| mbed_official | 579:53297373a894 | 161 | } |
| mbed_official | 579:53297373a894 | 162 | |
| mbed_official | 579:53297373a894 | 163 | /* Check and set master SCL low extend timeout. */ |
| mbed_official | 579:53297373a894 | 164 | if (config->master_scl_low_extend_timeout) { |
| mbed_official | 579:53297373a894 | 165 | tmp_ctrla |= SERCOM_I2CM_CTRLA_MEXTTOEN; |
| mbed_official | 579:53297373a894 | 166 | } |
| mbed_official | 579:53297373a894 | 167 | |
| mbed_official | 579:53297373a894 | 168 | /* Write config to register CTRLA. */ |
| mbed_official | 579:53297373a894 | 169 | i2c_module->CTRLA.reg |= tmp_ctrla; |
| mbed_official | 579:53297373a894 | 170 | |
| mbed_official | 579:53297373a894 | 171 | /* Set configurations in CTRLB. */ |
| mbed_official | 579:53297373a894 | 172 | i2c_module->CTRLB.reg = SERCOM_I2CM_CTRLB_SMEN; |
| mbed_official | 579:53297373a894 | 173 | |
| mbed_official | 579:53297373a894 | 174 | /* Find and set baudrate. */ |
| mbed_official | 579:53297373a894 | 175 | tmp_baud = (int32_t)(div_ceil( |
| mbed_official | 579:53297373a894 | 176 | system_gclk_chan_get_hz(SERCOM0_GCLK_ID_CORE + sercom_index), |
| mbed_official | 579:53297373a894 | 177 | (2000*(config->baud_rate))) - 5); |
| mbed_official | 579:53297373a894 | 178 | |
| mbed_official | 579:53297373a894 | 179 | /* Check that baudrate is supported at current speed. */ |
| mbed_official | 579:53297373a894 | 180 | if (tmp_baud > 255 || tmp_baud < 0) { |
| mbed_official | 579:53297373a894 | 181 | /* Baud rate not supported. */ |
| mbed_official | 579:53297373a894 | 182 | tmp_status_code = STATUS_ERR_BAUDRATE_UNAVAILABLE; |
| mbed_official | 579:53297373a894 | 183 | } else { |
| mbed_official | 579:53297373a894 | 184 | /* Find baudrate for high speed */ |
| mbed_official | 579:53297373a894 | 185 | tmp_baud_hs = (int32_t)(div_ceil( |
| mbed_official | 579:53297373a894 | 186 | system_gclk_chan_get_hz(SERCOM0_GCLK_ID_CORE + sercom_index), |
| mbed_official | 579:53297373a894 | 187 | (2000*(config->baud_rate_high_speed))) - 1); |
| mbed_official | 579:53297373a894 | 188 | |
| mbed_official | 579:53297373a894 | 189 | /* Check that baudrate is supported at current speed. */ |
| mbed_official | 579:53297373a894 | 190 | if (tmp_baud_hs > 255 || tmp_baud_hs < 0) { |
| mbed_official | 579:53297373a894 | 191 | /* Baud rate not supported. */ |
| mbed_official | 579:53297373a894 | 192 | tmp_status_code = STATUS_ERR_BAUDRATE_UNAVAILABLE; |
| mbed_official | 579:53297373a894 | 193 | } |
| mbed_official | 579:53297373a894 | 194 | } |
| mbed_official | 579:53297373a894 | 195 | if (tmp_status_code != STATUS_ERR_BAUDRATE_UNAVAILABLE) { |
| mbed_official | 579:53297373a894 | 196 | /* Baud rate acceptable. */ |
| mbed_official | 579:53297373a894 | 197 | i2c_module->BAUD.reg = SERCOM_I2CM_BAUD_BAUD(tmp_baud) | |
| mbed_official | 579:53297373a894 | 198 | SERCOM_I2CM_BAUD_HSBAUD(tmp_baud_hs); |
| mbed_official | 579:53297373a894 | 199 | } |
| mbed_official | 579:53297373a894 | 200 | |
| mbed_official | 579:53297373a894 | 201 | return tmp_status_code; |
| mbed_official | 579:53297373a894 | 202 | } |
| mbed_official | 579:53297373a894 | 203 | #endif /* __DOXYGEN__ */ |
| mbed_official | 579:53297373a894 | 204 | |
| mbed_official | 579:53297373a894 | 205 | /** |
| mbed_official | 579:53297373a894 | 206 | * \brief Initializes the requested I<SUP>2</SUP>C hardware module |
| mbed_official | 579:53297373a894 | 207 | * |
| mbed_official | 579:53297373a894 | 208 | * Initializes the SERCOM I<SUP>2</SUP>C master device requested and sets the provided |
| mbed_official | 579:53297373a894 | 209 | * software module struct. Run this function before any further use of |
| mbed_official | 579:53297373a894 | 210 | * the driver. |
| mbed_official | 579:53297373a894 | 211 | * |
| mbed_official | 579:53297373a894 | 212 | * \param[out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 213 | * \param[in] hw Pointer to the hardware instance |
| mbed_official | 579:53297373a894 | 214 | * \param[in] config Pointer to the configuration struct |
| mbed_official | 579:53297373a894 | 215 | * |
| mbed_official | 579:53297373a894 | 216 | * \return Status of initialization. |
| mbed_official | 579:53297373a894 | 217 | * \retval STATUS_OK Module initiated correctly |
| mbed_official | 579:53297373a894 | 218 | * \retval STATUS_ERR_DENIED If module is enabled |
| mbed_official | 579:53297373a894 | 219 | * \retval STATUS_BUSY If module is busy resetting |
| mbed_official | 579:53297373a894 | 220 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
| mbed_official | 579:53297373a894 | 221 | * previously set |
| mbed_official | 579:53297373a894 | 222 | * \retval STATUS_ERR_BAUDRATE_UNAVAILABLE If given baudrate is not compatible |
| mbed_official | 579:53297373a894 | 223 | * with set GCLK frequency |
| mbed_official | 579:53297373a894 | 224 | * |
| mbed_official | 579:53297373a894 | 225 | */ |
| mbed_official | 579:53297373a894 | 226 | enum status_code i2c_master_init( |
| mbed_official | 579:53297373a894 | 227 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 228 | Sercom *const hw, |
| mbed_official | 579:53297373a894 | 229 | const struct i2c_master_config *const config) |
| mbed_official | 579:53297373a894 | 230 | { |
| mbed_official | 579:53297373a894 | 231 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 232 | Assert(module); |
| mbed_official | 579:53297373a894 | 233 | Assert(hw); |
| mbed_official | 579:53297373a894 | 234 | Assert(config); |
| mbed_official | 579:53297373a894 | 235 | |
| mbed_official | 579:53297373a894 | 236 | /* Initialize software module */ |
| mbed_official | 579:53297373a894 | 237 | module->hw = hw; |
| mbed_official | 579:53297373a894 | 238 | |
| mbed_official | 579:53297373a894 | 239 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 240 | |
| mbed_official | 579:53297373a894 | 241 | uint32_t sercom_index = _sercom_get_sercom_inst_index(module->hw); |
| mbed_official | 579:53297373a894 | 242 | #if (SAML21) |
| mbed_official | 579:53297373a894 | 243 | uint32_t pm_index = sercom_index + MCLK_APBCMASK_SERCOM0_Pos; |
| mbed_official | 579:53297373a894 | 244 | #else |
| mbed_official | 579:53297373a894 | 245 | uint32_t pm_index = sercom_index + PM_APBCMASK_SERCOM0_Pos; |
| mbed_official | 579:53297373a894 | 246 | #endif |
| mbed_official | 579:53297373a894 | 247 | uint32_t gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE; |
| mbed_official | 579:53297373a894 | 248 | |
| mbed_official | 579:53297373a894 | 249 | /* Turn on module in PM */ |
| mbed_official | 579:53297373a894 | 250 | system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, 1 << pm_index); |
| mbed_official | 579:53297373a894 | 251 | |
| mbed_official | 579:53297373a894 | 252 | /* Set up the GCLK for the module */ |
| mbed_official | 579:53297373a894 | 253 | struct system_gclk_chan_config gclk_chan_conf; |
| mbed_official | 579:53297373a894 | 254 | system_gclk_chan_get_config_defaults(&gclk_chan_conf); |
| mbed_official | 579:53297373a894 | 255 | gclk_chan_conf.source_generator = config->generator_source; |
| mbed_official | 579:53297373a894 | 256 | system_gclk_chan_set_config(gclk_index, &gclk_chan_conf); |
| mbed_official | 579:53297373a894 | 257 | system_gclk_chan_enable(gclk_index); |
| mbed_official | 579:53297373a894 | 258 | sercom_set_gclk_generator(config->generator_source, false); |
| mbed_official | 579:53297373a894 | 259 | |
| mbed_official | 579:53297373a894 | 260 | /* Check if module is enabled. */ |
| mbed_official | 579:53297373a894 | 261 | if (i2c_module->CTRLA.reg & SERCOM_I2CM_CTRLA_ENABLE) { |
| mbed_official | 579:53297373a894 | 262 | return STATUS_ERR_DENIED; |
| mbed_official | 579:53297373a894 | 263 | } |
| mbed_official | 579:53297373a894 | 264 | |
| mbed_official | 579:53297373a894 | 265 | /* Check if reset is in progress. */ |
| mbed_official | 579:53297373a894 | 266 | if (i2c_module->CTRLA.reg & SERCOM_I2CM_CTRLA_SWRST) { |
| mbed_official | 579:53297373a894 | 267 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 268 | } |
| mbed_official | 579:53297373a894 | 269 | |
| mbed_official | 579:53297373a894 | 270 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 271 | /* Get sercom instance index and register callback. */ |
| mbed_official | 579:53297373a894 | 272 | uint8_t instance_index = _sercom_get_sercom_inst_index(module->hw); |
| mbed_official | 579:53297373a894 | 273 | _sercom_set_handler(instance_index, _i2c_master_interrupt_handler); |
| mbed_official | 579:53297373a894 | 274 | _sercom_instances[instance_index] = module; |
| mbed_official | 579:53297373a894 | 275 | |
| mbed_official | 579:53297373a894 | 276 | /* Initialize values in module. */ |
| mbed_official | 579:53297373a894 | 277 | module->registered_callback = 0; |
| mbed_official | 579:53297373a894 | 278 | module->enabled_callback = 0; |
| mbed_official | 579:53297373a894 | 279 | module->buffer_length = 0; |
| mbed_official | 579:53297373a894 | 280 | module->buffer_remaining = 0; |
| mbed_official | 579:53297373a894 | 281 | |
| mbed_official | 579:53297373a894 | 282 | module->status = STATUS_OK; |
| mbed_official | 579:53297373a894 | 283 | module->buffer = NULL; |
| mbed_official | 579:53297373a894 | 284 | #endif |
| mbed_official | 579:53297373a894 | 285 | |
| mbed_official | 579:53297373a894 | 286 | /* Set sercom module to operate in I2C master mode. */ |
| mbed_official | 579:53297373a894 | 287 | i2c_module->CTRLA.reg = SERCOM_I2CM_CTRLA_MODE(0x5); |
| mbed_official | 579:53297373a894 | 288 | |
| mbed_official | 579:53297373a894 | 289 | /* Set config and return status. */ |
| mbed_official | 579:53297373a894 | 290 | return _i2c_master_set_config(module, config); |
| mbed_official | 579:53297373a894 | 291 | } |
| mbed_official | 579:53297373a894 | 292 | |
| mbed_official | 579:53297373a894 | 293 | /** |
| mbed_official | 579:53297373a894 | 294 | * \brief Resets the hardware module |
| mbed_official | 579:53297373a894 | 295 | * |
| mbed_official | 579:53297373a894 | 296 | * Reset the module to hardware defaults. |
| mbed_official | 579:53297373a894 | 297 | * |
| mbed_official | 579:53297373a894 | 298 | * \param[in,out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 299 | */ |
| mbed_official | 579:53297373a894 | 300 | void i2c_master_reset(struct i2c_master_module *const module) |
| mbed_official | 579:53297373a894 | 301 | { |
| mbed_official | 579:53297373a894 | 302 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 303 | Assert(module); |
| mbed_official | 579:53297373a894 | 304 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 305 | |
| mbed_official | 579:53297373a894 | 306 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 307 | |
| mbed_official | 579:53297373a894 | 308 | /* Wait for sync */ |
| mbed_official | 579:53297373a894 | 309 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 310 | |
| mbed_official | 579:53297373a894 | 311 | /* Disable module */ |
| mbed_official | 579:53297373a894 | 312 | i2c_master_disable(module); |
| mbed_official | 579:53297373a894 | 313 | |
| mbed_official | 579:53297373a894 | 314 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 315 | /* Clear all pending interrupts */ |
| mbed_official | 579:53297373a894 | 316 | system_interrupt_enter_critical_section(); |
| mbed_official | 579:53297373a894 | 317 | system_interrupt_clear_pending(_sercom_get_interrupt_vector(module->hw)); |
| mbed_official | 579:53297373a894 | 318 | system_interrupt_leave_critical_section(); |
| mbed_official | 579:53297373a894 | 319 | #endif |
| mbed_official | 579:53297373a894 | 320 | |
| mbed_official | 579:53297373a894 | 321 | /* Wait for sync */ |
| mbed_official | 579:53297373a894 | 322 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 323 | |
| mbed_official | 579:53297373a894 | 324 | /* Reset module */ |
| mbed_official | 579:53297373a894 | 325 | i2c_module->CTRLA.reg = SERCOM_I2CM_CTRLA_SWRST; |
| mbed_official | 579:53297373a894 | 326 | } |
| mbed_official | 579:53297373a894 | 327 | |
| mbed_official | 579:53297373a894 | 328 | #if !defined(__DOXYGEN__) |
| mbed_official | 579:53297373a894 | 329 | /** |
| mbed_official | 579:53297373a894 | 330 | * \internal |
| mbed_official | 579:53297373a894 | 331 | * Address response. Called when address is answered or timed out. |
| mbed_official | 579:53297373a894 | 332 | * |
| mbed_official | 579:53297373a894 | 333 | * \param[in,out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 334 | * |
| mbed_official | 579:53297373a894 | 335 | * \return Status of address response. |
| mbed_official | 579:53297373a894 | 336 | * \retval STATUS_OK No error has occurred |
| mbed_official | 579:53297373a894 | 337 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 338 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 339 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 340 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 341 | */ |
| mbed_official | 579:53297373a894 | 342 | enum status_code _i2c_master_address_response( |
| mbed_official | 579:53297373a894 | 343 | struct i2c_master_module *const module) |
| mbed_official | 579:53297373a894 | 344 | { |
| mbed_official | 579:53297373a894 | 345 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 346 | Assert(module); |
| mbed_official | 579:53297373a894 | 347 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 348 | |
| mbed_official | 579:53297373a894 | 349 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 350 | |
| mbed_official | 579:53297373a894 | 351 | /* Check for error and ignore bus-error; workaround for BUSSTATE stuck in |
| mbed_official | 579:53297373a894 | 352 | * BUSY */ |
| mbed_official | 579:53297373a894 | 353 | if (i2c_module->INTFLAG.reg & SERCOM_I2CM_INTFLAG_SB) { |
| mbed_official | 579:53297373a894 | 354 | |
| mbed_official | 579:53297373a894 | 355 | /* Clear write interrupt flag */ |
| mbed_official | 579:53297373a894 | 356 | i2c_module->INTFLAG.reg = SERCOM_I2CM_INTFLAG_SB; |
| mbed_official | 579:53297373a894 | 357 | |
| mbed_official | 579:53297373a894 | 358 | /* Check arbitration. */ |
| mbed_official | 579:53297373a894 | 359 | if (i2c_module->STATUS.reg & SERCOM_I2CM_STATUS_ARBLOST) { |
| mbed_official | 579:53297373a894 | 360 | /* Return packet collision. */ |
| mbed_official | 579:53297373a894 | 361 | return STATUS_ERR_PACKET_COLLISION; |
| mbed_official | 579:53297373a894 | 362 | } |
| mbed_official | 579:53297373a894 | 363 | /* Check that slave responded with ack. */ |
| mbed_official | 579:53297373a894 | 364 | } else if (i2c_module->STATUS.reg & SERCOM_I2CM_STATUS_RXNACK) { |
| mbed_official | 579:53297373a894 | 365 | /* Slave busy. Issue ack and stop command. */ |
| mbed_official | 579:53297373a894 | 366 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_CMD(3); |
| mbed_official | 579:53297373a894 | 367 | |
| mbed_official | 579:53297373a894 | 368 | /* Return bad address value. */ |
| mbed_official | 579:53297373a894 | 369 | return STATUS_ERR_BAD_ADDRESS; |
| mbed_official | 579:53297373a894 | 370 | } |
| mbed_official | 579:53297373a894 | 371 | |
| mbed_official | 579:53297373a894 | 372 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 373 | } |
| mbed_official | 579:53297373a894 | 374 | |
| mbed_official | 579:53297373a894 | 375 | /** |
| mbed_official | 579:53297373a894 | 376 | * \internal |
| mbed_official | 579:53297373a894 | 377 | * Waits for answer on bus. |
| mbed_official | 579:53297373a894 | 378 | * |
| mbed_official | 579:53297373a894 | 379 | * \param[in,out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 380 | * |
| mbed_official | 579:53297373a894 | 381 | * \return Status of bus. |
| mbed_official | 579:53297373a894 | 382 | * \retval STATUS_OK If given response from slave device |
| mbed_official | 579:53297373a894 | 383 | * \retval STATUS_ERR_TIMEOUT If no response was given within specified timeout |
| mbed_official | 579:53297373a894 | 384 | * period |
| mbed_official | 579:53297373a894 | 385 | */ |
| mbed_official | 579:53297373a894 | 386 | enum status_code _i2c_master_wait_for_bus( |
| mbed_official | 579:53297373a894 | 387 | struct i2c_master_module *const module) |
| mbed_official | 579:53297373a894 | 388 | { |
| mbed_official | 579:53297373a894 | 389 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 390 | Assert(module); |
| mbed_official | 579:53297373a894 | 391 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 392 | |
| mbed_official | 579:53297373a894 | 393 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 394 | |
| mbed_official | 579:53297373a894 | 395 | /* Wait for reply. */ |
| mbed_official | 579:53297373a894 | 396 | uint16_t timeout_counter = 0; |
| mbed_official | 579:53297373a894 | 397 | while (!(i2c_module->INTFLAG.reg & SERCOM_I2CM_INTFLAG_MB) && |
| mbed_official | 579:53297373a894 | 398 | !(i2c_module->INTFLAG.reg & SERCOM_I2CM_INTFLAG_SB)) { |
| mbed_official | 579:53297373a894 | 399 | |
| mbed_official | 579:53297373a894 | 400 | /* Check timeout condition. */ |
| mbed_official | 579:53297373a894 | 401 | if (++timeout_counter >= module->buffer_timeout) { |
| mbed_official | 579:53297373a894 | 402 | return STATUS_ERR_TIMEOUT; |
| mbed_official | 579:53297373a894 | 403 | } |
| mbed_official | 579:53297373a894 | 404 | } |
| mbed_official | 579:53297373a894 | 405 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 406 | } |
| mbed_official | 579:53297373a894 | 407 | #endif /* __DOXYGEN__ */ |
| mbed_official | 579:53297373a894 | 408 | |
| mbed_official | 579:53297373a894 | 409 | /** |
| mbed_official | 579:53297373a894 | 410 | * \internal |
| mbed_official | 579:53297373a894 | 411 | * Send master code for high speed transfer. |
| mbed_official | 579:53297373a894 | 412 | * |
| mbed_official | 579:53297373a894 | 413 | * \param[in,out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 414 | * \param[in] hs_master_code 8-bit master code (0000 1XXX) |
| mbed_official | 579:53297373a894 | 415 | * |
| mbed_official | 579:53297373a894 | 416 | * \return Status of bus. |
| mbed_official | 579:53297373a894 | 417 | * \retval STATUS_OK No error happen |
| mbed_official | 579:53297373a894 | 418 | */ |
| mbed_official | 579:53297373a894 | 419 | enum status_code _i2c_master_send_hs_master_code( |
| mbed_official | 579:53297373a894 | 420 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 421 | uint8_t hs_master_code) |
| mbed_official | 579:53297373a894 | 422 | { |
| mbed_official | 579:53297373a894 | 423 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 424 | /* Return value. */ |
| mbed_official | 579:53297373a894 | 425 | enum status_code tmp_status; |
| mbed_official | 579:53297373a894 | 426 | |
| mbed_official | 579:53297373a894 | 427 | /* Set NACK for high speed code */ |
| mbed_official | 579:53297373a894 | 428 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 429 | /* Send high speed code */ |
| mbed_official | 579:53297373a894 | 430 | i2c_module->ADDR.reg = hs_master_code; |
| mbed_official | 579:53297373a894 | 431 | /* Wait for response on bus. */ |
| mbed_official | 579:53297373a894 | 432 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 433 | /* Clear write interrupt flag */ |
| mbed_official | 579:53297373a894 | 434 | i2c_module->INTFLAG.reg = SERCOM_I2CM_INTENCLR_MB; |
| mbed_official | 579:53297373a894 | 435 | |
| mbed_official | 579:53297373a894 | 436 | return tmp_status; |
| mbed_official | 579:53297373a894 | 437 | } |
| mbed_official | 579:53297373a894 | 438 | |
| mbed_official | 579:53297373a894 | 439 | |
| mbed_official | 579:53297373a894 | 440 | /** |
| mbed_official | 579:53297373a894 | 441 | * \internal |
| mbed_official | 579:53297373a894 | 442 | * Starts blocking read operation. |
| mbed_official | 579:53297373a894 | 443 | * |
| mbed_official | 579:53297373a894 | 444 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 445 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 446 | * |
| mbed_official | 579:53297373a894 | 447 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 448 | * \retval STATUS_OK The packet was read successfully |
| mbed_official | 579:53297373a894 | 449 | * \retval STATUS_ERR_TIMEOUT If no response was given within |
| mbed_official | 579:53297373a894 | 450 | * specified timeout period |
| mbed_official | 579:53297373a894 | 451 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 452 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 453 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 454 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 455 | * |
| mbed_official | 579:53297373a894 | 456 | */ |
| mbed_official | 579:53297373a894 | 457 | static enum status_code _i2c_master_read_packet( |
| mbed_official | 579:53297373a894 | 458 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 459 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 460 | { |
| mbed_official | 579:53297373a894 | 461 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 462 | Assert(module); |
| mbed_official | 579:53297373a894 | 463 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 464 | Assert(packet); |
| mbed_official | 579:53297373a894 | 465 | |
| mbed_official | 579:53297373a894 | 466 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 467 | |
| mbed_official | 579:53297373a894 | 468 | /* Return value. */ |
| mbed_official | 579:53297373a894 | 469 | enum status_code tmp_status; |
| mbed_official | 579:53297373a894 | 470 | uint16_t tmp_data_length = packet->data_length; |
| mbed_official | 579:53297373a894 | 471 | |
| mbed_official | 579:53297373a894 | 472 | /* Written buffer counter. */ |
| mbed_official | 579:53297373a894 | 473 | uint16_t counter = 0; |
| mbed_official | 579:53297373a894 | 474 | |
| mbed_official | 579:53297373a894 | 475 | bool sclsm_flag = i2c_module->CTRLA.bit.SCLSM; |
| mbed_official | 579:53297373a894 | 476 | |
| mbed_official | 579:53297373a894 | 477 | /* Switch to high speed mode */ |
| mbed_official | 579:53297373a894 | 478 | if (packet->high_speed) { |
| mbed_official | 579:53297373a894 | 479 | _i2c_master_send_hs_master_code(module, packet->hs_master_code); |
| mbed_official | 579:53297373a894 | 480 | } |
| mbed_official | 579:53297373a894 | 481 | |
| mbed_official | 579:53297373a894 | 482 | /* Set action to ACK. */ |
| mbed_official | 579:53297373a894 | 483 | i2c_module->CTRLB.reg &= ~SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 484 | |
| mbed_official | 579:53297373a894 | 485 | /* Set address and direction bit. Will send start command on bus. */ |
| mbed_official | 579:53297373a894 | 486 | if (packet->ten_bit_address) { |
| mbed_official | 579:53297373a894 | 487 | /* |
| mbed_official | 579:53297373a894 | 488 | * Write ADDR.ADDR[10:1] with the 10-bit address. ADDR.TENBITEN must |
| mbed_official | 579:53297373a894 | 489 | * be set and read/write bit (ADDR.ADDR[0]) equal to 0. |
| mbed_official | 579:53297373a894 | 490 | */ |
| mbed_official | 579:53297373a894 | 491 | i2c_module->ADDR.reg = (packet->address << 1) | |
| mbed_official | 579:53297373a894 | 492 | (packet->high_speed << SERCOM_I2CM_ADDR_HS_Pos) | |
| mbed_official | 579:53297373a894 | 493 | SERCOM_I2CM_ADDR_TENBITEN; |
| mbed_official | 579:53297373a894 | 494 | |
| mbed_official | 579:53297373a894 | 495 | /* Wait for response on bus. */ |
| mbed_official | 579:53297373a894 | 496 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 497 | |
| mbed_official | 579:53297373a894 | 498 | /* Set action to ack. */ |
| mbed_official | 579:53297373a894 | 499 | i2c_module->CTRLB.reg &= ~SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 500 | |
| mbed_official | 579:53297373a894 | 501 | /* Check for address response error unless previous error is |
| mbed_official | 579:53297373a894 | 502 | * detected. */ |
| mbed_official | 579:53297373a894 | 503 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 504 | tmp_status = _i2c_master_address_response(module); |
| mbed_official | 579:53297373a894 | 505 | } |
| mbed_official | 579:53297373a894 | 506 | |
| mbed_official | 579:53297373a894 | 507 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 508 | /* |
| mbed_official | 579:53297373a894 | 509 | * Write ADDR[7:0] register to 鈥10 address[9:8] 1鈥 |
| mbed_official | 579:53297373a894 | 510 | * ADDR.TENBITEN must be cleared |
| mbed_official | 579:53297373a894 | 511 | */ |
| mbed_official | 579:53297373a894 | 512 | i2c_module->ADDR.reg = (((packet->address >> 8) | 0x78) << 1) | |
| mbed_official | 579:53297373a894 | 513 | (packet->high_speed << SERCOM_I2CM_ADDR_HS_Pos) | |
| mbed_official | 579:53297373a894 | 514 | I2C_TRANSFER_READ; |
| mbed_official | 579:53297373a894 | 515 | } else { |
| mbed_official | 579:53297373a894 | 516 | return tmp_status; |
| mbed_official | 579:53297373a894 | 517 | } |
| mbed_official | 579:53297373a894 | 518 | } else { |
| mbed_official | 579:53297373a894 | 519 | i2c_module->ADDR.reg = (packet->address << 1) | I2C_TRANSFER_READ | |
| mbed_official | 579:53297373a894 | 520 | (packet->high_speed << SERCOM_I2CM_ADDR_HS_Pos); |
| mbed_official | 579:53297373a894 | 521 | } |
| mbed_official | 579:53297373a894 | 522 | |
| mbed_official | 579:53297373a894 | 523 | /* Wait for response on bus. */ |
| mbed_official | 579:53297373a894 | 524 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 525 | |
| mbed_official | 579:53297373a894 | 526 | /* Set action to ack. */ |
| mbed_official | 579:53297373a894 | 527 | i2c_module->CTRLB.reg &= ~SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 528 | |
| mbed_official | 579:53297373a894 | 529 | /* Check for address response error unless previous error is |
| mbed_official | 579:53297373a894 | 530 | * detected. */ |
| mbed_official | 579:53297373a894 | 531 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 532 | tmp_status = _i2c_master_address_response(module); |
| mbed_official | 579:53297373a894 | 533 | } |
| mbed_official | 579:53297373a894 | 534 | |
| mbed_official | 579:53297373a894 | 535 | /* Check that no error has occurred. */ |
| mbed_official | 579:53297373a894 | 536 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 537 | /* Read data buffer. */ |
| mbed_official | 579:53297373a894 | 538 | while (tmp_data_length--) { |
| mbed_official | 579:53297373a894 | 539 | /* Check that bus ownership is not lost. */ |
| mbed_official | 579:53297373a894 | 540 | if (!(i2c_module->STATUS.reg & SERCOM_I2CM_STATUS_BUSSTATE(2))) { |
| mbed_official | 579:53297373a894 | 541 | return STATUS_ERR_PACKET_COLLISION; |
| mbed_official | 579:53297373a894 | 542 | } |
| mbed_official | 579:53297373a894 | 543 | |
| mbed_official | 579:53297373a894 | 544 | if (((!sclsm_flag) && (tmp_data_length == 0)) || |
| mbed_official | 579:53297373a894 | 545 | ((sclsm_flag) && (tmp_data_length == 1))) { |
| mbed_official | 579:53297373a894 | 546 | /* Set action to NACK */ |
| mbed_official | 579:53297373a894 | 547 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 548 | } else { |
| mbed_official | 579:53297373a894 | 549 | /* Save data to buffer. */ |
| mbed_official | 579:53297373a894 | 550 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 551 | packet->data[counter++] = i2c_module->DATA.reg; |
| mbed_official | 579:53297373a894 | 552 | /* Wait for response. */ |
| mbed_official | 579:53297373a894 | 553 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 554 | } |
| mbed_official | 579:53297373a894 | 555 | |
| mbed_official | 579:53297373a894 | 556 | /* Check for error. */ |
| mbed_official | 579:53297373a894 | 557 | if (tmp_status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 558 | break; |
| mbed_official | 579:53297373a894 | 559 | } |
| mbed_official | 579:53297373a894 | 560 | } |
| mbed_official | 579:53297373a894 | 561 | |
| mbed_official | 579:53297373a894 | 562 | if (module->send_stop) { |
| mbed_official | 579:53297373a894 | 563 | /* Send stop command unless arbitration is lost. */ |
| mbed_official | 579:53297373a894 | 564 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 565 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_CMD(3); |
| mbed_official | 579:53297373a894 | 566 | } |
| mbed_official | 579:53297373a894 | 567 | |
| mbed_official | 579:53297373a894 | 568 | /* Save last data to buffer. */ |
| mbed_official | 579:53297373a894 | 569 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 570 | packet->data[counter] = i2c_module->DATA.reg; |
| mbed_official | 579:53297373a894 | 571 | } |
| mbed_official | 579:53297373a894 | 572 | |
| mbed_official | 579:53297373a894 | 573 | return tmp_status; |
| mbed_official | 579:53297373a894 | 574 | } |
| mbed_official | 579:53297373a894 | 575 | |
| mbed_official | 579:53297373a894 | 576 | /** |
| mbed_official | 579:53297373a894 | 577 | * \brief Reads data packet from slave |
| mbed_official | 579:53297373a894 | 578 | * |
| mbed_official | 579:53297373a894 | 579 | * Reads a data packet from the specified slave address on the I<SUP>2</SUP>C |
| mbed_official | 579:53297373a894 | 580 | * bus and sends a stop condition when finished. |
| mbed_official | 579:53297373a894 | 581 | * |
| mbed_official | 579:53297373a894 | 582 | * \note This will stall the device from any other operation. For |
| mbed_official | 579:53297373a894 | 583 | * interrupt-driven operation, see \ref i2c_master_read_packet_job. |
| mbed_official | 579:53297373a894 | 584 | * |
| mbed_official | 579:53297373a894 | 585 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 586 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 587 | * |
| mbed_official | 579:53297373a894 | 588 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 589 | * \retval STATUS_OK The packet was read successfully |
| mbed_official | 579:53297373a894 | 590 | * \retval STATUS_ERR_TIMEOUT If no response was given within |
| mbed_official | 579:53297373a894 | 591 | * specified timeout period |
| mbed_official | 579:53297373a894 | 592 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 593 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 594 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 595 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 596 | */ |
| mbed_official | 579:53297373a894 | 597 | enum status_code i2c_master_read_packet_wait( |
| mbed_official | 579:53297373a894 | 598 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 599 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 600 | { |
| mbed_official | 579:53297373a894 | 601 | /* Sanity check */ |
| mbed_official | 579:53297373a894 | 602 | Assert(module); |
| mbed_official | 579:53297373a894 | 603 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 604 | Assert(packet); |
| mbed_official | 579:53297373a894 | 605 | |
| mbed_official | 579:53297373a894 | 606 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 607 | /* Check if the I2C module is busy with a job. */ |
| mbed_official | 579:53297373a894 | 608 | if (module->buffer_remaining > 0) { |
| mbed_official | 579:53297373a894 | 609 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 610 | } |
| mbed_official | 579:53297373a894 | 611 | #endif |
| mbed_official | 579:53297373a894 | 612 | |
| mbed_official | 579:53297373a894 | 613 | module->send_stop = true; |
| mbed_official | 579:53297373a894 | 614 | |
| mbed_official | 579:53297373a894 | 615 | return _i2c_master_read_packet(module, packet); |
| mbed_official | 579:53297373a894 | 616 | } |
| mbed_official | 579:53297373a894 | 617 | |
| mbed_official | 579:53297373a894 | 618 | /** |
| mbed_official | 579:53297373a894 | 619 | * \brief Reads data packet from slave without sending a stop condition when done |
| mbed_official | 579:53297373a894 | 620 | * |
| mbed_official | 579:53297373a894 | 621 | * Reads a data packet from the specified slave address on the I<SUP>2</SUP>C |
| mbed_official | 579:53297373a894 | 622 | * bus without sending a stop condition when done, thus retaining ownership of |
| mbed_official | 579:53297373a894 | 623 | * the bus when done. To end the transaction, a |
| mbed_official | 579:53297373a894 | 624 | * \ref i2c_master_read_packet_wait "read" or |
| mbed_official | 579:53297373a894 | 625 | * \ref i2c_master_write_packet_wait "write" with stop condition must be |
| mbed_official | 579:53297373a894 | 626 | * performed. |
| mbed_official | 579:53297373a894 | 627 | * |
| mbed_official | 579:53297373a894 | 628 | * \note This will stall the device from any other operation. For |
| mbed_official | 579:53297373a894 | 629 | * interrupt-driven operation, see \ref i2c_master_read_packet_job. |
| mbed_official | 579:53297373a894 | 630 | * |
| mbed_official | 579:53297373a894 | 631 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 632 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 633 | * |
| mbed_official | 579:53297373a894 | 634 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 635 | * \retval STATUS_OK The packet was read successfully |
| mbed_official | 579:53297373a894 | 636 | * \retval STATUS_ERR_TIMEOUT If no response was given within |
| mbed_official | 579:53297373a894 | 637 | * specified timeout period |
| mbed_official | 579:53297373a894 | 638 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 639 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 640 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 641 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 642 | */ |
| mbed_official | 579:53297373a894 | 643 | enum status_code i2c_master_read_packet_wait_no_stop( |
| mbed_official | 579:53297373a894 | 644 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 645 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 646 | { |
| mbed_official | 579:53297373a894 | 647 | /* Sanity check */ |
| mbed_official | 579:53297373a894 | 648 | Assert(module); |
| mbed_official | 579:53297373a894 | 649 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 650 | Assert(packet); |
| mbed_official | 579:53297373a894 | 651 | |
| mbed_official | 579:53297373a894 | 652 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 653 | /* Check if the I2C module is busy with a job. */ |
| mbed_official | 579:53297373a894 | 654 | if (module->buffer_remaining > 0) { |
| mbed_official | 579:53297373a894 | 655 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 656 | } |
| mbed_official | 579:53297373a894 | 657 | #endif |
| mbed_official | 579:53297373a894 | 658 | |
| mbed_official | 579:53297373a894 | 659 | module->send_stop = false; |
| mbed_official | 579:53297373a894 | 660 | |
| mbed_official | 579:53297373a894 | 661 | return _i2c_master_read_packet(module, packet); |
| mbed_official | 579:53297373a894 | 662 | } |
| mbed_official | 579:53297373a894 | 663 | |
| mbed_official | 579:53297373a894 | 664 | /** |
| mbed_official | 579:53297373a894 | 665 | * \internal |
| mbed_official | 579:53297373a894 | 666 | * Starts blocking write operation. |
| mbed_official | 579:53297373a894 | 667 | * |
| mbed_official | 579:53297373a894 | 668 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 669 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 670 | * |
| mbed_official | 579:53297373a894 | 671 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 672 | * \retval STATUS_OK The packet was read successfully |
| mbed_official | 579:53297373a894 | 673 | * \retval STATUS_ERR_TIMEOUT If no response was given within |
| mbed_official | 579:53297373a894 | 674 | * specified timeout period |
| mbed_official | 579:53297373a894 | 675 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 676 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 677 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 678 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 679 | */ |
| mbed_official | 579:53297373a894 | 680 | static enum status_code _i2c_master_write_packet( |
| mbed_official | 579:53297373a894 | 681 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 682 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 683 | { |
| mbed_official | 579:53297373a894 | 684 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 685 | |
| mbed_official | 579:53297373a894 | 686 | /* Return value. */ |
| mbed_official | 579:53297373a894 | 687 | enum status_code tmp_status; |
| mbed_official | 579:53297373a894 | 688 | uint16_t tmp_data_length = packet->data_length; |
| mbed_official | 579:53297373a894 | 689 | |
| mbed_official | 579:53297373a894 | 690 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 691 | |
| mbed_official | 579:53297373a894 | 692 | /* Switch to high speed mode */ |
| mbed_official | 579:53297373a894 | 693 | if (packet->high_speed) { |
| mbed_official | 579:53297373a894 | 694 | _i2c_master_send_hs_master_code(module, packet->hs_master_code); |
| mbed_official | 579:53297373a894 | 695 | } |
| mbed_official | 579:53297373a894 | 696 | |
| mbed_official | 579:53297373a894 | 697 | /* Set action to ACK. */ |
| mbed_official | 579:53297373a894 | 698 | i2c_module->CTRLB.reg &= ~SERCOM_I2CM_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 699 | |
| mbed_official | 579:53297373a894 | 700 | /* Set address and direction bit. Will send start command on bus. */ |
| mbed_official | 579:53297373a894 | 701 | if (packet->ten_bit_address) { |
| mbed_official | 579:53297373a894 | 702 | i2c_module->ADDR.reg = (packet->address << 1) | I2C_TRANSFER_WRITE | |
| mbed_official | 579:53297373a894 | 703 | (packet->high_speed << SERCOM_I2CM_ADDR_HS_Pos) | |
| mbed_official | 579:53297373a894 | 704 | SERCOM_I2CM_ADDR_TENBITEN; |
| mbed_official | 579:53297373a894 | 705 | } else { |
| mbed_official | 579:53297373a894 | 706 | i2c_module->ADDR.reg = (packet->address << 1) | I2C_TRANSFER_WRITE | |
| mbed_official | 579:53297373a894 | 707 | (packet->high_speed << SERCOM_I2CM_ADDR_HS_Pos); |
| mbed_official | 579:53297373a894 | 708 | } |
| mbed_official | 579:53297373a894 | 709 | /* Wait for response on bus. */ |
| mbed_official | 579:53297373a894 | 710 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 711 | |
| mbed_official | 579:53297373a894 | 712 | /* Check for address response error unless previous error is |
| mbed_official | 579:53297373a894 | 713 | * detected. */ |
| mbed_official | 579:53297373a894 | 714 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 715 | tmp_status = _i2c_master_address_response(module); |
| mbed_official | 579:53297373a894 | 716 | } |
| mbed_official | 579:53297373a894 | 717 | |
| mbed_official | 579:53297373a894 | 718 | /* Check that no error has occurred. */ |
| mbed_official | 579:53297373a894 | 719 | if (tmp_status == STATUS_OK) { |
| mbed_official | 579:53297373a894 | 720 | /* Buffer counter. */ |
| mbed_official | 579:53297373a894 | 721 | uint16_t buffer_counter = 0; |
| mbed_official | 579:53297373a894 | 722 | |
| mbed_official | 579:53297373a894 | 723 | /* Write data buffer. */ |
| mbed_official | 579:53297373a894 | 724 | while (tmp_data_length--) { |
| mbed_official | 579:53297373a894 | 725 | /* Check that bus ownership is not lost. */ |
| mbed_official | 579:53297373a894 | 726 | if (!(i2c_module->STATUS.reg & SERCOM_I2CM_STATUS_BUSSTATE(2))) { |
| mbed_official | 579:53297373a894 | 727 | return STATUS_ERR_PACKET_COLLISION; |
| mbed_official | 579:53297373a894 | 728 | } |
| mbed_official | 579:53297373a894 | 729 | |
| mbed_official | 579:53297373a894 | 730 | /* Write byte to slave. */ |
| mbed_official | 579:53297373a894 | 731 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 732 | i2c_module->DATA.reg = packet->data[buffer_counter++]; |
| mbed_official | 579:53297373a894 | 733 | |
| mbed_official | 579:53297373a894 | 734 | /* Wait for response. */ |
| mbed_official | 579:53297373a894 | 735 | tmp_status = _i2c_master_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 736 | |
| mbed_official | 579:53297373a894 | 737 | /* Check for error. */ |
| mbed_official | 579:53297373a894 | 738 | if (tmp_status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 739 | break; |
| mbed_official | 579:53297373a894 | 740 | } |
| mbed_official | 579:53297373a894 | 741 | |
| mbed_official | 579:53297373a894 | 742 | /* Check for NACK from slave. */ |
| mbed_official | 579:53297373a894 | 743 | if (i2c_module->STATUS.reg & SERCOM_I2CM_STATUS_RXNACK) { |
| mbed_official | 579:53297373a894 | 744 | /* Return bad data value. */ |
| mbed_official | 579:53297373a894 | 745 | tmp_status = STATUS_ERR_OVERFLOW; |
| mbed_official | 579:53297373a894 | 746 | break; |
| mbed_official | 579:53297373a894 | 747 | } |
| mbed_official | 579:53297373a894 | 748 | } |
| mbed_official | 579:53297373a894 | 749 | |
| mbed_official | 579:53297373a894 | 750 | if (module->send_stop) { |
| mbed_official | 579:53297373a894 | 751 | /* Stop command */ |
| mbed_official | 579:53297373a894 | 752 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 753 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_CMD(3); |
| mbed_official | 579:53297373a894 | 754 | } |
| mbed_official | 579:53297373a894 | 755 | } |
| mbed_official | 579:53297373a894 | 756 | |
| mbed_official | 579:53297373a894 | 757 | return tmp_status; |
| mbed_official | 579:53297373a894 | 758 | } |
| mbed_official | 579:53297373a894 | 759 | |
| mbed_official | 579:53297373a894 | 760 | /** |
| mbed_official | 579:53297373a894 | 761 | * \brief Writes data packet to slave |
| mbed_official | 579:53297373a894 | 762 | * |
| mbed_official | 579:53297373a894 | 763 | * Writes a data packet to the specified slave address on the I<SUP>2</SUP>C bus |
| mbed_official | 579:53297373a894 | 764 | * and sends a stop condition when finished. |
| mbed_official | 579:53297373a894 | 765 | * |
| mbed_official | 579:53297373a894 | 766 | * \note This will stall the device from any other operation. For |
| mbed_official | 579:53297373a894 | 767 | * interrupt-driven operation, see \ref i2c_master_read_packet_job. |
| mbed_official | 579:53297373a894 | 768 | * |
| mbed_official | 579:53297373a894 | 769 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 770 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 771 | * |
| mbed_official | 579:53297373a894 | 772 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 773 | * \retval STATUS_OK If packet was read |
| mbed_official | 579:53297373a894 | 774 | * \retval STATUS_BUSY If master module is busy with a job |
| mbed_official | 579:53297373a894 | 775 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 776 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 777 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 778 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 779 | * \retval STATUS_ERR_TIMEOUT If timeout occurred |
| mbed_official | 579:53297373a894 | 780 | * \retval STATUS_ERR_OVERFLOW If slave did not acknowledge last sent |
| mbed_official | 579:53297373a894 | 781 | * data, indicating that slave does not |
| mbed_official | 579:53297373a894 | 782 | * want more data and was not able to read |
| mbed_official | 579:53297373a894 | 783 | * last data sent |
| mbed_official | 579:53297373a894 | 784 | */ |
| mbed_official | 579:53297373a894 | 785 | enum status_code i2c_master_write_packet_wait( |
| mbed_official | 579:53297373a894 | 786 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 787 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 788 | { |
| mbed_official | 579:53297373a894 | 789 | /* Sanity check */ |
| mbed_official | 579:53297373a894 | 790 | Assert(module); |
| mbed_official | 579:53297373a894 | 791 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 792 | Assert(packet); |
| mbed_official | 579:53297373a894 | 793 | |
| mbed_official | 579:53297373a894 | 794 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 795 | /* Check if the I2C module is busy with a job */ |
| mbed_official | 579:53297373a894 | 796 | if (module->buffer_remaining > 0) { |
| mbed_official | 579:53297373a894 | 797 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 798 | } |
| mbed_official | 579:53297373a894 | 799 | #endif |
| mbed_official | 579:53297373a894 | 800 | |
| mbed_official | 579:53297373a894 | 801 | module->send_stop = true; |
| mbed_official | 579:53297373a894 | 802 | |
| mbed_official | 579:53297373a894 | 803 | return _i2c_master_write_packet(module, packet); |
| mbed_official | 579:53297373a894 | 804 | } |
| mbed_official | 579:53297373a894 | 805 | |
| mbed_official | 579:53297373a894 | 806 | /** |
| mbed_official | 579:53297373a894 | 807 | * \brief Writes data packet to slave without sending a stop condition when done |
| mbed_official | 579:53297373a894 | 808 | * |
| mbed_official | 579:53297373a894 | 809 | * Writes a data packet to the specified slave address on the I<SUP>2</SUP>C bus |
| mbed_official | 579:53297373a894 | 810 | * without sending a stop condition, thus retaining ownership of the bus when |
| mbed_official | 579:53297373a894 | 811 | * done. To end the transaction, a \ref i2c_master_read_packet_wait "read" or |
| mbed_official | 579:53297373a894 | 812 | * \ref i2c_master_write_packet_wait "write" with stop condition or sending a |
| mbed_official | 579:53297373a894 | 813 | * stop with the \ref i2c_master_send_stop function must be performed. |
| mbed_official | 579:53297373a894 | 814 | * |
| mbed_official | 579:53297373a894 | 815 | * \note This will stall the device from any other operation. For |
| mbed_official | 579:53297373a894 | 816 | * interrupt-driven operation, see \ref i2c_master_read_packet_job. |
| mbed_official | 579:53297373a894 | 817 | * |
| mbed_official | 579:53297373a894 | 818 | * \param[in,out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 819 | * \param[in,out] packet Pointer to I<SUP>2</SUP>C packet to transfer |
| mbed_official | 579:53297373a894 | 820 | * |
| mbed_official | 579:53297373a894 | 821 | * \return Status of reading packet. |
| mbed_official | 579:53297373a894 | 822 | * \retval STATUS_OK If packet was read |
| mbed_official | 579:53297373a894 | 823 | * \retval STATUS_BUSY If master module is busy |
| mbed_official | 579:53297373a894 | 824 | * \retval STATUS_ERR_DENIED If error on bus |
| mbed_official | 579:53297373a894 | 825 | * \retval STATUS_ERR_PACKET_COLLISION If arbitration is lost |
| mbed_official | 579:53297373a894 | 826 | * \retval STATUS_ERR_BAD_ADDRESS If slave is busy, or no slave |
| mbed_official | 579:53297373a894 | 827 | * acknowledged the address |
| mbed_official | 579:53297373a894 | 828 | * \retval STATUS_ERR_TIMEOUT If timeout occurred |
| mbed_official | 579:53297373a894 | 829 | * \retval STATUS_ERR_OVERFLOW If slave did not acknowledge last sent |
| mbed_official | 579:53297373a894 | 830 | * data, indicating that slave do not want |
| mbed_official | 579:53297373a894 | 831 | * more data |
| mbed_official | 579:53297373a894 | 832 | */ |
| mbed_official | 579:53297373a894 | 833 | enum status_code i2c_master_write_packet_wait_no_stop( |
| mbed_official | 579:53297373a894 | 834 | struct i2c_master_module *const module, |
| mbed_official | 579:53297373a894 | 835 | struct i2c_master_packet *const packet) |
| mbed_official | 579:53297373a894 | 836 | { |
| mbed_official | 579:53297373a894 | 837 | /* Sanity check */ |
| mbed_official | 579:53297373a894 | 838 | Assert(module); |
| mbed_official | 579:53297373a894 | 839 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 840 | Assert(packet); |
| mbed_official | 579:53297373a894 | 841 | |
| mbed_official | 579:53297373a894 | 842 | #if I2C_MASTER_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 843 | /* Check if the I2C module is busy with a job */ |
| mbed_official | 579:53297373a894 | 844 | if (module->buffer_remaining > 0) { |
| mbed_official | 579:53297373a894 | 845 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 846 | } |
| mbed_official | 579:53297373a894 | 847 | #endif |
| mbed_official | 579:53297373a894 | 848 | |
| mbed_official | 579:53297373a894 | 849 | module->send_stop = false; |
| mbed_official | 579:53297373a894 | 850 | |
| mbed_official | 579:53297373a894 | 851 | return _i2c_master_write_packet(module, packet); |
| mbed_official | 579:53297373a894 | 852 | } |
| mbed_official | 579:53297373a894 | 853 | |
| mbed_official | 579:53297373a894 | 854 | /** |
| mbed_official | 579:53297373a894 | 855 | * \brief Sends stop condition on bus |
| mbed_official | 579:53297373a894 | 856 | * |
| mbed_official | 579:53297373a894 | 857 | * Sends a stop condition on bus. |
| mbed_official | 579:53297373a894 | 858 | * |
| mbed_official | 579:53297373a894 | 859 | * \note This function can only be used after the |
| mbed_official | 579:53297373a894 | 860 | * \ref i2c_master_write_packet_wait_no_stop function. If a stop condition |
| mbed_official | 579:53297373a894 | 861 | * is to be sent after a read, the \ref i2c_master_read_packet_wait |
| mbed_official | 579:53297373a894 | 862 | * function must be used. |
| mbed_official | 579:53297373a894 | 863 | * |
| mbed_official | 579:53297373a894 | 864 | * \param[in] module Pointer to the software instance struct |
| mbed_official | 579:53297373a894 | 865 | */ |
| mbed_official | 579:53297373a894 | 866 | void i2c_master_send_stop(struct i2c_master_module *const module) |
| mbed_official | 579:53297373a894 | 867 | { |
| mbed_official | 579:53297373a894 | 868 | /* Sanity check */ |
| mbed_official | 579:53297373a894 | 869 | Assert(module); |
| mbed_official | 579:53297373a894 | 870 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 871 | |
| mbed_official | 579:53297373a894 | 872 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 873 | |
| mbed_official | 579:53297373a894 | 874 | /* Send stop command */ |
| mbed_official | 579:53297373a894 | 875 | _i2c_master_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 876 | i2c_module->CTRLB.reg |= SERCOM_I2CM_CTRLB_CMD(3); |
| mbed_official | 579:53297373a894 | 877 | } |
