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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_slave.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 I<SUP>2</SUP>C Slave Driver |
| mbed_official | 579:53297373a894 | 5 | * |
| mbed_official | 579:53297373a894 | 6 | * Copyright (C) 2013-2014 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_slave.h" |
| mbed_official | 579:53297373a894 | 48 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 49 | # include "i2c_slave_interrupt.h" |
| mbed_official | 579:53297373a894 | 50 | #endif |
| mbed_official | 579:53297373a894 | 51 | |
| mbed_official | 579:53297373a894 | 52 | /** |
| mbed_official | 579:53297373a894 | 53 | * \internal Sets configuration to module |
| mbed_official | 579:53297373a894 | 54 | * |
| mbed_official | 579:53297373a894 | 55 | * \param[out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 56 | * \param[in] config Configuration structure with configurations to set |
| mbed_official | 579:53297373a894 | 57 | * |
| mbed_official | 579:53297373a894 | 58 | * \return Status of setting configuration. |
| mbed_official | 579:53297373a894 | 59 | * \retval STATUS_OK Module was configured correctly |
| mbed_official | 579:53297373a894 | 60 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
| mbed_official | 579:53297373a894 | 61 | * previously set |
| mbed_official | 579:53297373a894 | 62 | */ |
| mbed_official | 579:53297373a894 | 63 | static enum status_code _i2c_slave_set_config( |
| mbed_official | 579:53297373a894 | 64 | struct i2c_slave_module *const module, |
| mbed_official | 579:53297373a894 | 65 | const struct i2c_slave_config *const config) |
| mbed_official | 579:53297373a894 | 66 | { |
| mbed_official | 579:53297373a894 | 67 | uint32_t tmp_ctrla; |
| mbed_official | 579:53297373a894 | 68 | |
| mbed_official | 579:53297373a894 | 69 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 70 | Assert(module); |
| mbed_official | 579:53297373a894 | 71 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 72 | Assert(config); |
| mbed_official | 579:53297373a894 | 73 | |
| mbed_official | 579:53297373a894 | 74 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 75 | Sercom *const sercom_hw = module->hw; |
| mbed_official | 579:53297373a894 | 76 | |
| mbed_official | 579:53297373a894 | 77 | module->buffer_timeout = config->buffer_timeout; |
| mbed_official | 579:53297373a894 | 78 | module->ten_bit_address = config->ten_bit_address; |
| mbed_official | 579:53297373a894 | 79 | |
| mbed_official | 579:53297373a894 | 80 | struct system_pinmux_config pin_conf; |
| mbed_official | 579:53297373a894 | 81 | system_pinmux_get_config_defaults(&pin_conf); |
| mbed_official | 579:53297373a894 | 82 | |
| mbed_official | 579:53297373a894 | 83 | uint32_t pad0 = config->pinmux_pad0; |
| mbed_official | 579:53297373a894 | 84 | uint32_t pad1 = config->pinmux_pad1; |
| mbed_official | 579:53297373a894 | 85 | |
| mbed_official | 579:53297373a894 | 86 | /* SERCOM PAD0 - SDA */ |
| mbed_official | 579:53297373a894 | 87 | if (pad0 == PINMUX_DEFAULT) { |
| mbed_official | 579:53297373a894 | 88 | pad0 = _sercom_get_default_pad(sercom_hw, 0); |
| mbed_official | 579:53297373a894 | 89 | } |
| mbed_official | 579:53297373a894 | 90 | pin_conf.mux_position = pad0 & 0xFFFF; |
| mbed_official | 579:53297373a894 | 91 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
| mbed_official | 579:53297373a894 | 92 | system_pinmux_pin_set_config(pad0 >> 16, &pin_conf); |
| mbed_official | 579:53297373a894 | 93 | |
| mbed_official | 579:53297373a894 | 94 | /* SERCOM PAD1 - SCL */ |
| mbed_official | 579:53297373a894 | 95 | if (pad1 == PINMUX_DEFAULT) { |
| mbed_official | 579:53297373a894 | 96 | pad1 = _sercom_get_default_pad(sercom_hw, 1); |
| mbed_official | 579:53297373a894 | 97 | } |
| mbed_official | 579:53297373a894 | 98 | pin_conf.mux_position = pad1 & 0xFFFF; |
| mbed_official | 579:53297373a894 | 99 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
| mbed_official | 579:53297373a894 | 100 | system_pinmux_pin_set_config(pad1 >> 16, &pin_conf); |
| mbed_official | 579:53297373a894 | 101 | |
| mbed_official | 579:53297373a894 | 102 | /* Prepare config to write to register CTRLA */ |
| mbed_official | 579:53297373a894 | 103 | if (config->run_in_standby || system_is_debugger_present()) { |
| mbed_official | 579:53297373a894 | 104 | tmp_ctrla = SERCOM_I2CS_CTRLA_RUNSTDBY; |
| mbed_official | 579:53297373a894 | 105 | } else { |
| mbed_official | 579:53297373a894 | 106 | tmp_ctrla = 0; |
| mbed_official | 579:53297373a894 | 107 | } |
| mbed_official | 579:53297373a894 | 108 | |
| mbed_official | 579:53297373a894 | 109 | tmp_ctrla |= ((uint32_t)config->sda_hold_time | |
| mbed_official | 579:53297373a894 | 110 | config->transfer_speed | |
| mbed_official | 579:53297373a894 | 111 | (config->scl_low_timeout << SERCOM_I2CS_CTRLA_LOWTOUTEN_Pos) | |
| mbed_official | 579:53297373a894 | 112 | (config->scl_stretch_only_after_ack_bit << SERCOM_I2CS_CTRLA_SCLSM_Pos) | |
| mbed_official | 579:53297373a894 | 113 | (config->slave_scl_low_extend_timeout << SERCOM_I2CS_CTRLA_SEXTTOEN_Pos)); |
| mbed_official | 579:53297373a894 | 114 | |
| mbed_official | 579:53297373a894 | 115 | i2c_hw->CTRLA.reg |= tmp_ctrla; |
| mbed_official | 579:53297373a894 | 116 | |
| mbed_official | 579:53297373a894 | 117 | /* Set CTRLB configuration */ |
| mbed_official | 579:53297373a894 | 118 | i2c_hw->CTRLB.reg = SERCOM_I2CS_CTRLB_SMEN | config->address_mode; |
| mbed_official | 579:53297373a894 | 119 | |
| mbed_official | 579:53297373a894 | 120 | i2c_hw->ADDR.reg = config->address << SERCOM_I2CS_ADDR_ADDR_Pos | |
| mbed_official | 579:53297373a894 | 121 | config->address_mask << SERCOM_I2CS_ADDR_ADDRMASK_Pos | |
| mbed_official | 579:53297373a894 | 122 | config->ten_bit_address << SERCOM_I2CS_ADDR_TENBITEN_Pos | |
| mbed_official | 579:53297373a894 | 123 | config->enable_general_call_address << SERCOM_I2CS_ADDR_GENCEN_Pos; |
| mbed_official | 579:53297373a894 | 124 | |
| mbed_official | 579:53297373a894 | 125 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 126 | } |
| mbed_official | 579:53297373a894 | 127 | |
| mbed_official | 579:53297373a894 | 128 | /** |
| mbed_official | 579:53297373a894 | 129 | * \brief Initializes the requested I<SUP>2</SUP>C hardware module |
| mbed_official | 579:53297373a894 | 130 | * |
| mbed_official | 579:53297373a894 | 131 | * Initializes the SERCOM I<SUP>2</SUP>C Slave device requested and sets the provided |
| mbed_official | 579:53297373a894 | 132 | * software module struct. Run this function before any further use of |
| mbed_official | 579:53297373a894 | 133 | * the driver. |
| mbed_official | 579:53297373a894 | 134 | * |
| mbed_official | 579:53297373a894 | 135 | * \param[out] module Pointer to software module struct |
| mbed_official | 579:53297373a894 | 136 | * \param[in] hw Pointer to the hardware instance |
| mbed_official | 579:53297373a894 | 137 | * \param[in] config Pointer to the configuration struct |
| mbed_official | 579:53297373a894 | 138 | * |
| mbed_official | 579:53297373a894 | 139 | * \return Status of initialization. |
| mbed_official | 579:53297373a894 | 140 | * \retval STATUS_OK Module initiated correctly |
| mbed_official | 579:53297373a894 | 141 | * \retval STATUS_ERR_DENIED If module is enabled |
| mbed_official | 579:53297373a894 | 142 | * \retval STATUS_BUSY If module is busy resetting |
| mbed_official | 579:53297373a894 | 143 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
| mbed_official | 579:53297373a894 | 144 | * previously set |
| mbed_official | 579:53297373a894 | 145 | */ |
| mbed_official | 579:53297373a894 | 146 | enum status_code i2c_slave_init( |
| mbed_official | 579:53297373a894 | 147 | struct i2c_slave_module *const module, |
| mbed_official | 579:53297373a894 | 148 | Sercom *const hw, |
| mbed_official | 579:53297373a894 | 149 | const struct i2c_slave_config *const config) |
| mbed_official | 579:53297373a894 | 150 | { |
| mbed_official | 579:53297373a894 | 151 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 152 | Assert(module); |
| mbed_official | 579:53297373a894 | 153 | Assert(hw); |
| mbed_official | 579:53297373a894 | 154 | Assert(config); |
| mbed_official | 579:53297373a894 | 155 | |
| mbed_official | 579:53297373a894 | 156 | /* Initialize software module */ |
| mbed_official | 579:53297373a894 | 157 | module->hw = hw; |
| mbed_official | 579:53297373a894 | 158 | |
| mbed_official | 579:53297373a894 | 159 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 160 | |
| mbed_official | 579:53297373a894 | 161 | /* Check if module is enabled. */ |
| mbed_official | 579:53297373a894 | 162 | if (i2c_hw->CTRLA.reg & SERCOM_I2CS_CTRLA_ENABLE) { |
| mbed_official | 579:53297373a894 | 163 | return STATUS_ERR_DENIED; |
| mbed_official | 579:53297373a894 | 164 | } |
| mbed_official | 579:53297373a894 | 165 | |
| mbed_official | 579:53297373a894 | 166 | /* Check if reset is in progress. */ |
| mbed_official | 579:53297373a894 | 167 | if (i2c_hw->CTRLA.reg & SERCOM_I2CS_CTRLA_SWRST) { |
| mbed_official | 579:53297373a894 | 168 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 169 | } |
| mbed_official | 579:53297373a894 | 170 | |
| mbed_official | 579:53297373a894 | 171 | uint32_t sercom_index = _sercom_get_sercom_inst_index(module->hw); |
| mbed_official | 579:53297373a894 | 172 | #if (SAML21) |
| mbed_official | 579:53297373a894 | 173 | uint32_t pm_index = sercom_index + MCLK_APBCMASK_SERCOM0_Pos; |
| mbed_official | 579:53297373a894 | 174 | #else |
| mbed_official | 579:53297373a894 | 175 | uint32_t pm_index = sercom_index + PM_APBCMASK_SERCOM0_Pos; |
| mbed_official | 579:53297373a894 | 176 | #endif |
| mbed_official | 579:53297373a894 | 177 | uint32_t gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE; |
| mbed_official | 579:53297373a894 | 178 | |
| mbed_official | 579:53297373a894 | 179 | /* Turn on module in PM */ |
| mbed_official | 579:53297373a894 | 180 | system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, 1 << pm_index); |
| mbed_official | 579:53297373a894 | 181 | |
| mbed_official | 579:53297373a894 | 182 | /* Set up the GCLK for the module */ |
| mbed_official | 579:53297373a894 | 183 | struct system_gclk_chan_config gclk_chan_conf; |
| mbed_official | 579:53297373a894 | 184 | system_gclk_chan_get_config_defaults(&gclk_chan_conf); |
| mbed_official | 579:53297373a894 | 185 | gclk_chan_conf.source_generator = config->generator_source; |
| mbed_official | 579:53297373a894 | 186 | system_gclk_chan_set_config(gclk_index, &gclk_chan_conf); |
| mbed_official | 579:53297373a894 | 187 | system_gclk_chan_enable(gclk_index); |
| mbed_official | 579:53297373a894 | 188 | sercom_set_gclk_generator(config->generator_source, false); |
| mbed_official | 579:53297373a894 | 189 | |
| mbed_official | 579:53297373a894 | 190 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 191 | /* Get sercom instance index. */ |
| mbed_official | 579:53297373a894 | 192 | uint8_t instance_index = _sercom_get_sercom_inst_index(module->hw); |
| mbed_official | 579:53297373a894 | 193 | |
| mbed_official | 579:53297373a894 | 194 | /* Save software module in interrupt handler. */ |
| mbed_official | 579:53297373a894 | 195 | _sercom_set_handler(instance_index, _i2c_slave_interrupt_handler); |
| mbed_official | 579:53297373a894 | 196 | |
| mbed_official | 579:53297373a894 | 197 | /* Save software module. */ |
| mbed_official | 579:53297373a894 | 198 | _sercom_instances[instance_index] = module; |
| mbed_official | 579:53297373a894 | 199 | |
| mbed_official | 579:53297373a894 | 200 | /* Initialize values in module. */ |
| mbed_official | 579:53297373a894 | 201 | module->registered_callback = 0; |
| mbed_official | 579:53297373a894 | 202 | module->enabled_callback = 0; |
| mbed_official | 579:53297373a894 | 203 | module->buffer_length = 0; |
| mbed_official | 579:53297373a894 | 204 | module->nack_on_address = config->enable_nack_on_address; |
| mbed_official | 579:53297373a894 | 205 | #endif |
| mbed_official | 579:53297373a894 | 206 | |
| mbed_official | 579:53297373a894 | 207 | /* Set SERCOM module to operate in I2C slave mode. */ |
| mbed_official | 579:53297373a894 | 208 | i2c_hw->CTRLA.reg = SERCOM_I2CS_CTRLA_MODE(0x4); |
| mbed_official | 579:53297373a894 | 209 | |
| mbed_official | 579:53297373a894 | 210 | /* Set config and return status. */ |
| mbed_official | 579:53297373a894 | 211 | return _i2c_slave_set_config(module, config); |
| mbed_official | 579:53297373a894 | 212 | } |
| mbed_official | 579:53297373a894 | 213 | |
| mbed_official | 579:53297373a894 | 214 | /** |
| mbed_official | 579:53297373a894 | 215 | * \brief Resets the hardware module |
| mbed_official | 579:53297373a894 | 216 | * |
| mbed_official | 579:53297373a894 | 217 | * This will reset the module to hardware defaults. |
| mbed_official | 579:53297373a894 | 218 | * |
| mbed_official | 579:53297373a894 | 219 | * \param[in,out] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 220 | */ |
| mbed_official | 579:53297373a894 | 221 | void i2c_slave_reset( |
| mbed_official | 579:53297373a894 | 222 | struct i2c_slave_module *const module) |
| mbed_official | 579:53297373a894 | 223 | { |
| mbed_official | 579:53297373a894 | 224 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 225 | Assert(module); |
| mbed_official | 579:53297373a894 | 226 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 227 | |
| mbed_official | 579:53297373a894 | 228 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 229 | |
| mbed_official | 579:53297373a894 | 230 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 231 | /* Reset module instance. */ |
| mbed_official | 579:53297373a894 | 232 | module->registered_callback = 0; |
| mbed_official | 579:53297373a894 | 233 | module->enabled_callback = 0; |
| mbed_official | 579:53297373a894 | 234 | module->buffer_length = 0; |
| mbed_official | 579:53297373a894 | 235 | module->buffer_remaining = 0; |
| mbed_official | 579:53297373a894 | 236 | module->buffer = NULL; |
| mbed_official | 579:53297373a894 | 237 | #endif |
| mbed_official | 579:53297373a894 | 238 | |
| mbed_official | 579:53297373a894 | 239 | /* Disable module */ |
| mbed_official | 579:53297373a894 | 240 | i2c_slave_disable(module); |
| mbed_official | 579:53297373a894 | 241 | |
| mbed_official | 579:53297373a894 | 242 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 243 | /* Clear all pending interrupts. */ |
| mbed_official | 579:53297373a894 | 244 | system_interrupt_enter_critical_section(); |
| mbed_official | 579:53297373a894 | 245 | system_interrupt_clear_pending(_sercom_get_interrupt_vector(module->hw)); |
| mbed_official | 579:53297373a894 | 246 | system_interrupt_leave_critical_section(); |
| mbed_official | 579:53297373a894 | 247 | #endif |
| mbed_official | 579:53297373a894 | 248 | |
| mbed_official | 579:53297373a894 | 249 | /* Wait for sync. */ |
| mbed_official | 579:53297373a894 | 250 | _i2c_slave_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 251 | |
| mbed_official | 579:53297373a894 | 252 | /* Reset module. */ |
| mbed_official | 579:53297373a894 | 253 | i2c_hw->CTRLA.reg = SERCOM_I2CS_CTRLA_SWRST; |
| mbed_official | 579:53297373a894 | 254 | } |
| mbed_official | 579:53297373a894 | 255 | |
| mbed_official | 579:53297373a894 | 256 | /** |
| mbed_official | 579:53297373a894 | 257 | * \internal Waits for answer on bus |
| mbed_official | 579:53297373a894 | 258 | * |
| mbed_official | 579:53297373a894 | 259 | * \param[in] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 260 | * |
| mbed_official | 579:53297373a894 | 261 | * \return Status of bus. |
| mbed_official | 579:53297373a894 | 262 | * \retval STATUS_OK If given response from slave device |
| mbed_official | 579:53297373a894 | 263 | * \retval STATUS_ERR_TIMEOUT If no response was given within specified timeout |
| mbed_official | 579:53297373a894 | 264 | * period |
| mbed_official | 579:53297373a894 | 265 | */ |
| mbed_official | 579:53297373a894 | 266 | static enum status_code _i2c_slave_wait_for_bus( |
| mbed_official | 579:53297373a894 | 267 | struct i2c_slave_module *const module) |
| mbed_official | 579:53297373a894 | 268 | { |
| mbed_official | 579:53297373a894 | 269 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 270 | Assert(module); |
| mbed_official | 579:53297373a894 | 271 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 272 | |
| mbed_official | 579:53297373a894 | 273 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
| mbed_official | 579:53297373a894 | 274 | |
| mbed_official | 579:53297373a894 | 275 | /* Wait for reply. */ |
| mbed_official | 579:53297373a894 | 276 | uint16_t timeout_counter = 0; |
| mbed_official | 579:53297373a894 | 277 | while ((!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_DRDY)) && |
| mbed_official | 579:53297373a894 | 278 | (!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC)) && |
| mbed_official | 579:53297373a894 | 279 | (!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH))) { |
| mbed_official | 579:53297373a894 | 280 | |
| mbed_official | 579:53297373a894 | 281 | /* Check timeout condition. */ |
| mbed_official | 579:53297373a894 | 282 | if (++timeout_counter >= module->buffer_timeout) { |
| mbed_official | 579:53297373a894 | 283 | return STATUS_ERR_TIMEOUT; |
| mbed_official | 579:53297373a894 | 284 | } |
| mbed_official | 579:53297373a894 | 285 | } |
| mbed_official | 579:53297373a894 | 286 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 287 | } |
| mbed_official | 579:53297373a894 | 288 | |
| mbed_official | 579:53297373a894 | 289 | /** |
| mbed_official | 579:53297373a894 | 290 | * \brief Writes a packet to the master |
| mbed_official | 579:53297373a894 | 291 | * |
| mbed_official | 579:53297373a894 | 292 | * Writes a packet to the master. This will wait for the master to issue |
| mbed_official | 579:53297373a894 | 293 | * a request. |
| mbed_official | 579:53297373a894 | 294 | * |
| mbed_official | 579:53297373a894 | 295 | * \param[in] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 296 | * \param[in] packet Packet to write to master |
| mbed_official | 579:53297373a894 | 297 | * |
| mbed_official | 579:53297373a894 | 298 | * \return Status of packet write. |
| mbed_official | 579:53297373a894 | 299 | * \retval STATUS_OK Packet was written successfully |
| mbed_official | 579:53297373a894 | 300 | * \retval STATUS_ERR_DENIED Start condition not received, another |
| mbed_official | 579:53297373a894 | 301 | * interrupt flag is set |
| mbed_official | 579:53297373a894 | 302 | * \retval STATUS_ERR_IO There was an error in the previous transfer |
| mbed_official | 579:53297373a894 | 303 | * \retval STATUS_ERR_BAD_FORMAT Master wants to write data |
| mbed_official | 579:53297373a894 | 304 | * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) was provided |
| mbed_official | 579:53297373a894 | 305 | * \retval STATUS_ERR_BUSY The I<SUP>2</SUP>C module is busy with a job |
| mbed_official | 579:53297373a894 | 306 | * \retval STATUS_ERR_ERR_OVERFLOW Master NACKed before entire packet was |
| mbed_official | 579:53297373a894 | 307 | * transferred |
| mbed_official | 579:53297373a894 | 308 | * \retval STATUS_ERR_TIMEOUT No response was given within the timeout |
| mbed_official | 579:53297373a894 | 309 | * period |
| mbed_official | 579:53297373a894 | 310 | */ |
| mbed_official | 579:53297373a894 | 311 | enum status_code i2c_slave_write_packet_wait( |
| mbed_official | 579:53297373a894 | 312 | struct i2c_slave_module *const module, |
| mbed_official | 579:53297373a894 | 313 | struct i2c_slave_packet *const packet) |
| mbed_official | 579:53297373a894 | 314 | { |
| mbed_official | 579:53297373a894 | 315 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 316 | Assert(module); |
| mbed_official | 579:53297373a894 | 317 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 318 | Assert(packet); |
| mbed_official | 579:53297373a894 | 319 | |
| mbed_official | 579:53297373a894 | 320 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 321 | |
| mbed_official | 579:53297373a894 | 322 | uint16_t length = packet->data_length; |
| mbed_official | 579:53297373a894 | 323 | |
| mbed_official | 579:53297373a894 | 324 | if (length == 0) { |
| mbed_official | 579:53297373a894 | 325 | return STATUS_ERR_INVALID_ARG; |
| mbed_official | 579:53297373a894 | 326 | } |
| mbed_official | 579:53297373a894 | 327 | |
| mbed_official | 579:53297373a894 | 328 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 329 | /* Check if the module is busy with a job or AMATCH is enabled */ |
| mbed_official | 579:53297373a894 | 330 | if (module->buffer_remaining > 0 || |
| mbed_official | 579:53297373a894 | 331 | (i2c_hw->INTENSET.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 332 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 333 | } |
| mbed_official | 579:53297373a894 | 334 | #endif |
| mbed_official | 579:53297373a894 | 335 | |
| mbed_official | 579:53297373a894 | 336 | enum status_code status; |
| mbed_official | 579:53297373a894 | 337 | /* Wait for master to send address packet */ |
| mbed_official | 579:53297373a894 | 338 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 339 | |
| mbed_official | 579:53297373a894 | 340 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 341 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 342 | return status; |
| mbed_official | 579:53297373a894 | 343 | } |
| mbed_official | 579:53297373a894 | 344 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 345 | /* Not address interrupt, something is wrong */ |
| mbed_official | 579:53297373a894 | 346 | return STATUS_ERR_DENIED; |
| mbed_official | 579:53297373a894 | 347 | } |
| mbed_official | 579:53297373a894 | 348 | |
| mbed_official | 579:53297373a894 | 349 | if (module->ten_bit_address) { |
| mbed_official | 579:53297373a894 | 350 | /* ACK the first address */ |
| mbed_official | 579:53297373a894 | 351 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 352 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
| mbed_official | 579:53297373a894 | 353 | |
| mbed_official | 579:53297373a894 | 354 | /* Wait for address interrupt */ |
| mbed_official | 579:53297373a894 | 355 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 356 | |
| mbed_official | 579:53297373a894 | 357 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 358 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 359 | return STATUS_ERR_TIMEOUT; |
| mbed_official | 579:53297373a894 | 360 | } |
| mbed_official | 579:53297373a894 | 361 | |
| mbed_official | 579:53297373a894 | 362 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 363 | /* Not address interrupt, something is wrong */ |
| mbed_official | 579:53297373a894 | 364 | return STATUS_ERR_DENIED; |
| mbed_official | 579:53297373a894 | 365 | } |
| mbed_official | 579:53297373a894 | 366 | } |
| mbed_official | 579:53297373a894 | 367 | |
| mbed_official | 579:53297373a894 | 368 | /* Check if there was an error in last transfer */ |
| mbed_official | 579:53297373a894 | 369 | if (i2c_hw->STATUS.reg & (SERCOM_I2CS_STATUS_BUSERR | |
| mbed_official | 579:53297373a894 | 370 | SERCOM_I2CS_STATUS_COLL | SERCOM_I2CS_STATUS_LOWTOUT)) { |
| mbed_official | 579:53297373a894 | 371 | return STATUS_ERR_IO; |
| mbed_official | 579:53297373a894 | 372 | } |
| mbed_official | 579:53297373a894 | 373 | |
| mbed_official | 579:53297373a894 | 374 | /* Check direction */ |
| mbed_official | 579:53297373a894 | 375 | if (!(i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
| mbed_official | 579:53297373a894 | 376 | /* Write request from master, send NACK and return */ |
| mbed_official | 579:53297373a894 | 377 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 378 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
| mbed_official | 579:53297373a894 | 379 | return STATUS_ERR_BAD_FORMAT; |
| mbed_official | 579:53297373a894 | 380 | } |
| mbed_official | 579:53297373a894 | 381 | |
| mbed_official | 579:53297373a894 | 382 | /* Read request from master, ACK address */ |
| mbed_official | 579:53297373a894 | 383 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 384 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
| mbed_official | 579:53297373a894 | 385 | |
| mbed_official | 579:53297373a894 | 386 | uint16_t i = 0; |
| mbed_official | 579:53297373a894 | 387 | |
| mbed_official | 579:53297373a894 | 388 | /* Wait for data interrupt */ |
| mbed_official | 579:53297373a894 | 389 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 390 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 391 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 392 | return status; |
| mbed_official | 579:53297373a894 | 393 | } |
| mbed_official | 579:53297373a894 | 394 | |
| mbed_official | 579:53297373a894 | 395 | while (length--) { |
| mbed_official | 579:53297373a894 | 396 | /* Write data */ |
| mbed_official | 579:53297373a894 | 397 | _i2c_slave_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 398 | i2c_hw->DATA.reg = packet->data[i++]; |
| mbed_official | 579:53297373a894 | 399 | |
| mbed_official | 579:53297373a894 | 400 | /* Wait for response from master */ |
| mbed_official | 579:53297373a894 | 401 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 402 | |
| mbed_official | 579:53297373a894 | 403 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 404 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 405 | return status; |
| mbed_official | 579:53297373a894 | 406 | } |
| mbed_official | 579:53297373a894 | 407 | |
| mbed_official | 579:53297373a894 | 408 | if (i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_RXNACK && |
| mbed_official | 579:53297373a894 | 409 | length !=0) { |
| mbed_official | 579:53297373a894 | 410 | /* NACK from master, abort */ |
| mbed_official | 579:53297373a894 | 411 | /* Release line */ |
| mbed_official | 579:53297373a894 | 412 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x02); |
| mbed_official | 579:53297373a894 | 413 | |
| mbed_official | 579:53297373a894 | 414 | return STATUS_ERR_OVERFLOW; |
| mbed_official | 579:53297373a894 | 415 | } |
| mbed_official | 579:53297373a894 | 416 | /* ACK from master, continue writing */ |
| mbed_official | 579:53297373a894 | 417 | } |
| mbed_official | 579:53297373a894 | 418 | |
| mbed_official | 579:53297373a894 | 419 | /* Release line */ |
| mbed_official | 579:53297373a894 | 420 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x02); |
| mbed_official | 579:53297373a894 | 421 | |
| mbed_official | 579:53297373a894 | 422 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 423 | } |
| mbed_official | 579:53297373a894 | 424 | |
| mbed_official | 579:53297373a894 | 425 | /** |
| mbed_official | 579:53297373a894 | 426 | * \brief Reads a packet from the master |
| mbed_official | 579:53297373a894 | 427 | * |
| mbed_official | 579:53297373a894 | 428 | * Reads a packet from the master. This will wait for the master to issue a |
| mbed_official | 579:53297373a894 | 429 | * request. |
| mbed_official | 579:53297373a894 | 430 | * |
| mbed_official | 579:53297373a894 | 431 | * \param[in] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 432 | * \param[out] packet Packet to read from master |
| mbed_official | 579:53297373a894 | 433 | * |
| mbed_official | 579:53297373a894 | 434 | * \return Status of packet read. |
| mbed_official | 579:53297373a894 | 435 | * \retval STATUS_OK Packet was read successfully |
| mbed_official | 579:53297373a894 | 436 | * \retval STATUS_ABORTED Master sent stop condition or repeated |
| mbed_official | 579:53297373a894 | 437 | * start before specified length of bytes |
| mbed_official | 579:53297373a894 | 438 | * was received |
| mbed_official | 579:53297373a894 | 439 | * \retval STATUS_ERR_IO There was an error in the previous transfer |
| mbed_official | 579:53297373a894 | 440 | * \retval STATUS_ERR_DENIED Start condition not received, another |
| mbed_official | 579:53297373a894 | 441 | * interrupt flag is set |
| mbed_official | 579:53297373a894 | 442 | * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) was provided |
| mbed_official | 579:53297373a894 | 443 | * \retval STATUS_ERR_BUSY The I<SUP>2</SUP>C module is busy with a job |
| mbed_official | 579:53297373a894 | 444 | * \retval STATUS_ERR_BAD_FORMAT Master wants to read data |
| mbed_official | 579:53297373a894 | 445 | * \retval STATUS_ERR_ERR_OVERFLOW Last byte received overflows buffer |
| mbed_official | 579:53297373a894 | 446 | */ |
| mbed_official | 579:53297373a894 | 447 | enum status_code i2c_slave_read_packet_wait( |
| mbed_official | 579:53297373a894 | 448 | struct i2c_slave_module *const module, |
| mbed_official | 579:53297373a894 | 449 | struct i2c_slave_packet *const packet) |
| mbed_official | 579:53297373a894 | 450 | { |
| mbed_official | 579:53297373a894 | 451 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 452 | Assert(module); |
| mbed_official | 579:53297373a894 | 453 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 454 | Assert(packet); |
| mbed_official | 579:53297373a894 | 455 | |
| mbed_official | 579:53297373a894 | 456 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 457 | |
| mbed_official | 579:53297373a894 | 458 | uint16_t length = packet->data_length; |
| mbed_official | 579:53297373a894 | 459 | |
| mbed_official | 579:53297373a894 | 460 | if (length == 0) { |
| mbed_official | 579:53297373a894 | 461 | return STATUS_ERR_INVALID_ARG; |
| mbed_official | 579:53297373a894 | 462 | } |
| mbed_official | 579:53297373a894 | 463 | |
| mbed_official | 579:53297373a894 | 464 | #if I2C_SLAVE_CALLBACK_MODE == true |
| mbed_official | 579:53297373a894 | 465 | /* Check if the module is busy with a job or AMATCH is enabled */ |
| mbed_official | 579:53297373a894 | 466 | if (module->buffer_remaining > 0 || |
| mbed_official | 579:53297373a894 | 467 | (i2c_hw->INTENSET.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 468 | return STATUS_BUSY; |
| mbed_official | 579:53297373a894 | 469 | } |
| mbed_official | 579:53297373a894 | 470 | #endif |
| mbed_official | 579:53297373a894 | 471 | |
| mbed_official | 579:53297373a894 | 472 | enum status_code status; |
| mbed_official | 579:53297373a894 | 473 | |
| mbed_official | 579:53297373a894 | 474 | /* Wait for master to send address packet */ |
| mbed_official | 579:53297373a894 | 475 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 476 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 477 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 478 | return status; |
| mbed_official | 579:53297373a894 | 479 | } |
| mbed_official | 579:53297373a894 | 480 | |
| mbed_official | 579:53297373a894 | 481 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 482 | /* Not address interrupt, something is wrong */ |
| mbed_official | 579:53297373a894 | 483 | return STATUS_ERR_DENIED; |
| mbed_official | 579:53297373a894 | 484 | } |
| mbed_official | 579:53297373a894 | 485 | |
| mbed_official | 579:53297373a894 | 486 | /* Check if there was an error in the last transfer */ |
| mbed_official | 579:53297373a894 | 487 | if (i2c_hw->STATUS.reg & (SERCOM_I2CS_STATUS_BUSERR | |
| mbed_official | 579:53297373a894 | 488 | SERCOM_I2CS_STATUS_COLL | SERCOM_I2CS_STATUS_LOWTOUT)) { |
| mbed_official | 579:53297373a894 | 489 | return STATUS_ERR_IO; |
| mbed_official | 579:53297373a894 | 490 | } |
| mbed_official | 579:53297373a894 | 491 | /* Check direction */ |
| mbed_official | 579:53297373a894 | 492 | if ((i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
| mbed_official | 579:53297373a894 | 493 | /* Read request from master, send NACK and return */ |
| mbed_official | 579:53297373a894 | 494 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 495 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
| mbed_official | 579:53297373a894 | 496 | return STATUS_ERR_BAD_FORMAT; |
| mbed_official | 579:53297373a894 | 497 | } |
| mbed_official | 579:53297373a894 | 498 | |
| mbed_official | 579:53297373a894 | 499 | /* Write request from master, ACK address */ |
| mbed_official | 579:53297373a894 | 500 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 501 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
| mbed_official | 579:53297373a894 | 502 | |
| mbed_official | 579:53297373a894 | 503 | uint16_t i = 0; |
| mbed_official | 579:53297373a894 | 504 | while (length--) { |
| mbed_official | 579:53297373a894 | 505 | |
| mbed_official | 579:53297373a894 | 506 | /* Wait for next byte or stop condition */ |
| mbed_official | 579:53297373a894 | 507 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 508 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 509 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 510 | return status; |
| mbed_official | 579:53297373a894 | 511 | } |
| mbed_official | 579:53297373a894 | 512 | |
| mbed_official | 579:53297373a894 | 513 | if ((i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC) || |
| mbed_official | 579:53297373a894 | 514 | i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH) { |
| mbed_official | 579:53297373a894 | 515 | /* Master sent stop condition, or repeated start, read done */ |
| mbed_official | 579:53297373a894 | 516 | /* Clear stop flag */ |
| mbed_official | 579:53297373a894 | 517 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
| mbed_official | 579:53297373a894 | 518 | return STATUS_ABORTED; |
| mbed_official | 579:53297373a894 | 519 | } |
| mbed_official | 579:53297373a894 | 520 | |
| mbed_official | 579:53297373a894 | 521 | /* Read data */ |
| mbed_official | 579:53297373a894 | 522 | _i2c_slave_wait_for_sync(module); |
| mbed_official | 579:53297373a894 | 523 | packet->data[i++] = i2c_hw->DATA.reg; |
| mbed_official | 579:53297373a894 | 524 | |
| mbed_official | 579:53297373a894 | 525 | } |
| mbed_official | 579:53297373a894 | 526 | |
| mbed_official | 579:53297373a894 | 527 | /* Packet read done, wait for packet to NACK, Stop or repeated start */ |
| mbed_official | 579:53297373a894 | 528 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 529 | |
| mbed_official | 579:53297373a894 | 530 | if (i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_DRDY) { |
| mbed_official | 579:53297373a894 | 531 | /* Buffer is full, send NACK */ |
| mbed_official | 579:53297373a894 | 532 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
| mbed_official | 579:53297373a894 | 533 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x2); |
| mbed_official | 579:53297373a894 | 534 | } |
| mbed_official | 579:53297373a894 | 535 | if (i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC) { |
| mbed_official | 579:53297373a894 | 536 | /* Clear stop flag */ |
| mbed_official | 579:53297373a894 | 537 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
| mbed_official | 579:53297373a894 | 538 | } |
| mbed_official | 579:53297373a894 | 539 | return STATUS_OK; |
| mbed_official | 579:53297373a894 | 540 | } |
| mbed_official | 579:53297373a894 | 541 | |
| mbed_official | 579:53297373a894 | 542 | /** |
| mbed_official | 579:53297373a894 | 543 | * \brief Waits for a start condition on the bus |
| mbed_official | 579:53297373a894 | 544 | * |
| mbed_official | 579:53297373a894 | 545 | * \note This function is only available for 7-bit slave addressing. |
| mbed_official | 579:53297373a894 | 546 | * |
| mbed_official | 579:53297373a894 | 547 | * Waits for the master to issue a start condition on the bus. |
| mbed_official | 579:53297373a894 | 548 | * Note that this function does not check for errors in the last transfer, |
| mbed_official | 579:53297373a894 | 549 | * this will be discovered when reading or writing. |
| mbed_official | 579:53297373a894 | 550 | * |
| mbed_official | 579:53297373a894 | 551 | * \param[in] module Pointer to software module structure |
| mbed_official | 579:53297373a894 | 552 | * |
| mbed_official | 579:53297373a894 | 553 | * \return Direction of the current transfer, when in slave mode. |
| mbed_official | 579:53297373a894 | 554 | * \retval I2C_SLAVE_DIRECTION_NONE No request from master within timeout |
| mbed_official | 579:53297373a894 | 555 | * period |
| mbed_official | 579:53297373a894 | 556 | * \retval I2C_SLAVE_DIRECTION_READ Write request from master |
| mbed_official | 579:53297373a894 | 557 | * \retval I2C_SLAVE_DIRECTION_WRITE Read request from master |
| mbed_official | 579:53297373a894 | 558 | */ |
| mbed_official | 579:53297373a894 | 559 | enum i2c_slave_direction i2c_slave_get_direction_wait( |
| mbed_official | 579:53297373a894 | 560 | struct i2c_slave_module *const module) |
| mbed_official | 579:53297373a894 | 561 | { |
| mbed_official | 579:53297373a894 | 562 | /* Sanity check arguments. */ |
| mbed_official | 579:53297373a894 | 563 | Assert(module); |
| mbed_official | 579:53297373a894 | 564 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 565 | |
| mbed_official | 579:53297373a894 | 566 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 567 | |
| mbed_official | 579:53297373a894 | 568 | enum status_code status; |
| mbed_official | 579:53297373a894 | 569 | |
| mbed_official | 579:53297373a894 | 570 | /* Wait for address interrupt */ |
| mbed_official | 579:53297373a894 | 571 | status = _i2c_slave_wait_for_bus(module); |
| mbed_official | 579:53297373a894 | 572 | |
| mbed_official | 579:53297373a894 | 573 | if (status != STATUS_OK) { |
| mbed_official | 579:53297373a894 | 574 | /* Timeout, return */ |
| mbed_official | 579:53297373a894 | 575 | return I2C_SLAVE_DIRECTION_NONE; |
| mbed_official | 579:53297373a894 | 576 | } |
| mbed_official | 579:53297373a894 | 577 | |
| mbed_official | 579:53297373a894 | 578 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
| mbed_official | 579:53297373a894 | 579 | /* Not address interrupt, something is wrong */ |
| mbed_official | 579:53297373a894 | 580 | return I2C_SLAVE_DIRECTION_NONE; |
| mbed_official | 579:53297373a894 | 581 | } |
| mbed_official | 579:53297373a894 | 582 | |
| mbed_official | 579:53297373a894 | 583 | /* Check direction */ |
| mbed_official | 579:53297373a894 | 584 | if ((i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
| mbed_official | 579:53297373a894 | 585 | /* Read request from master */ |
| mbed_official | 579:53297373a894 | 586 | return I2C_SLAVE_DIRECTION_WRITE; |
| mbed_official | 579:53297373a894 | 587 | } else { |
| mbed_official | 579:53297373a894 | 588 | /* Write request from master */ |
| mbed_official | 579:53297373a894 | 589 | return I2C_SLAVE_DIRECTION_READ; |
| mbed_official | 579:53297373a894 | 590 | } |
| mbed_official | 579:53297373a894 | 591 | } |
| mbed_official | 579:53297373a894 | 592 | |
| mbed_official | 579:53297373a894 | 593 | /** |
| mbed_official | 579:53297373a894 | 594 | * \brief Retrieves the current module status |
| mbed_official | 579:53297373a894 | 595 | * |
| mbed_official | 579:53297373a894 | 596 | * Checks the status of the module and returns it as a bitmask of status |
| mbed_official | 579:53297373a894 | 597 | * flags. |
| mbed_official | 579:53297373a894 | 598 | * |
| mbed_official | 579:53297373a894 | 599 | * \param[in] module Pointer to the I<SUP>2</SUP>C slave software device struct |
| mbed_official | 579:53297373a894 | 600 | * |
| mbed_official | 579:53297373a894 | 601 | * \return Bitmask of status flags. |
| mbed_official | 579:53297373a894 | 602 | * |
| mbed_official | 579:53297373a894 | 603 | * \retval I2C_SLAVE_STATUS_ADDRESS_MATCH A valid address has been received |
| mbed_official | 579:53297373a894 | 604 | * \retval I2C_SLAVE_STATUS_DATA_READY A I<SUP>2</SUP>C slave byte transmission is |
| mbed_official | 579:53297373a894 | 605 | * successfully completed |
| mbed_official | 579:53297373a894 | 606 | * \retval I2C_SLAVE_STATUS_STOP_RECEIVED A stop condition is detected for a |
| mbed_official | 579:53297373a894 | 607 | * transaction being processed |
| mbed_official | 579:53297373a894 | 608 | * \retval I2C_SLAVE_STATUS_CLOCK_HOLD The slave is holding the SCL line |
| mbed_official | 579:53297373a894 | 609 | * low |
| mbed_official | 579:53297373a894 | 610 | * \retval I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT An SCL low time-out has occurred |
| mbed_official | 579:53297373a894 | 611 | * \retval I2C_SLAVE_STATUS_REPEATED_START Indicates a repeated start, only |
| mbed_official | 579:53297373a894 | 612 | * valid if \ref |
| mbed_official | 579:53297373a894 | 613 | * I2C_SLAVE_STATUS_ADDRESS_MATCH is |
| mbed_official | 579:53297373a894 | 614 | * set |
| mbed_official | 579:53297373a894 | 615 | * \retval I2C_SLAVE_STATUS_RECEIVED_NACK The last data packet sent was not |
| mbed_official | 579:53297373a894 | 616 | * acknowledged |
| mbed_official | 579:53297373a894 | 617 | * \retval I2C_SLAVE_STATUS_COLLISION The I<SUP>2</SUP>C slave was not able to |
| mbed_official | 579:53297373a894 | 618 | * transmit a high data or NACK bit |
| mbed_official | 579:53297373a894 | 619 | * \retval I2C_SLAVE_STATUS_BUS_ERROR An illegal bus condition has |
| mbed_official | 579:53297373a894 | 620 | * occurred on the bus |
| mbed_official | 579:53297373a894 | 621 | */ |
| mbed_official | 579:53297373a894 | 622 | uint32_t i2c_slave_get_status( |
| mbed_official | 579:53297373a894 | 623 | struct i2c_slave_module *const module) |
| mbed_official | 579:53297373a894 | 624 | { |
| mbed_official | 579:53297373a894 | 625 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 626 | Assert(module); |
| mbed_official | 579:53297373a894 | 627 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 628 | |
| mbed_official | 579:53297373a894 | 629 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 630 | |
| mbed_official | 579:53297373a894 | 631 | uint8_t intflags = i2c_hw->INTFLAG.reg; |
| mbed_official | 579:53297373a894 | 632 | uint8_t status = i2c_hw->STATUS.reg; |
| mbed_official | 579:53297373a894 | 633 | uint32_t status_flags = 0; |
| mbed_official | 579:53297373a894 | 634 | |
| mbed_official | 579:53297373a894 | 635 | /* Check Address Match flag */ |
| mbed_official | 579:53297373a894 | 636 | if (intflags & SERCOM_I2CS_INTFLAG_AMATCH) { |
| mbed_official | 579:53297373a894 | 637 | status_flags |= I2C_SLAVE_STATUS_ADDRESS_MATCH; |
| mbed_official | 579:53297373a894 | 638 | } |
| mbed_official | 579:53297373a894 | 639 | /* Check Data Ready flag */ |
| mbed_official | 579:53297373a894 | 640 | if (intflags & SERCOM_I2CS_INTFLAG_DRDY) { |
| mbed_official | 579:53297373a894 | 641 | status_flags |= I2C_SLAVE_STATUS_DATA_READY; |
| mbed_official | 579:53297373a894 | 642 | } |
| mbed_official | 579:53297373a894 | 643 | /* Check Stop flag */ |
| mbed_official | 579:53297373a894 | 644 | if (intflags & SERCOM_I2CS_INTFLAG_PREC) { |
| mbed_official | 579:53297373a894 | 645 | status_flags |= I2C_SLAVE_STATUS_STOP_RECEIVED; |
| mbed_official | 579:53297373a894 | 646 | } |
| mbed_official | 579:53297373a894 | 647 | /* Check Clock Hold */ |
| mbed_official | 579:53297373a894 | 648 | if (status & SERCOM_I2CS_STATUS_CLKHOLD) { |
| mbed_official | 579:53297373a894 | 649 | status_flags |= I2C_SLAVE_STATUS_CLOCK_HOLD; |
| mbed_official | 579:53297373a894 | 650 | } |
| mbed_official | 579:53297373a894 | 651 | /* Check SCL Low Timeout */ |
| mbed_official | 579:53297373a894 | 652 | if (status & SERCOM_I2CS_STATUS_LOWTOUT) { |
| mbed_official | 579:53297373a894 | 653 | status_flags |= I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT; |
| mbed_official | 579:53297373a894 | 654 | } |
| mbed_official | 579:53297373a894 | 655 | /* Check Repeated Start */ |
| mbed_official | 579:53297373a894 | 656 | if (status & SERCOM_I2CS_STATUS_SR) { |
| mbed_official | 579:53297373a894 | 657 | status_flags |= I2C_SLAVE_STATUS_REPEATED_START; |
| mbed_official | 579:53297373a894 | 658 | } |
| mbed_official | 579:53297373a894 | 659 | /* Check Received Not Acknowledge */ |
| mbed_official | 579:53297373a894 | 660 | if (status & SERCOM_I2CS_STATUS_RXNACK) { |
| mbed_official | 579:53297373a894 | 661 | status_flags |= I2C_SLAVE_STATUS_RECEIVED_NACK; |
| mbed_official | 579:53297373a894 | 662 | } |
| mbed_official | 579:53297373a894 | 663 | /* Check Transmit Collision */ |
| mbed_official | 579:53297373a894 | 664 | if (status & SERCOM_I2CS_STATUS_COLL) { |
| mbed_official | 579:53297373a894 | 665 | status_flags |= I2C_SLAVE_STATUS_COLLISION; |
| mbed_official | 579:53297373a894 | 666 | } |
| mbed_official | 579:53297373a894 | 667 | /* Check Bus Error */ |
| mbed_official | 579:53297373a894 | 668 | if (status & SERCOM_I2CS_STATUS_BUSERR) { |
| mbed_official | 579:53297373a894 | 669 | status_flags |= I2C_SLAVE_STATUS_BUS_ERROR; |
| mbed_official | 579:53297373a894 | 670 | } |
| mbed_official | 579:53297373a894 | 671 | |
| mbed_official | 579:53297373a894 | 672 | return status_flags; |
| mbed_official | 579:53297373a894 | 673 | } |
| mbed_official | 579:53297373a894 | 674 | |
| mbed_official | 579:53297373a894 | 675 | /** |
| mbed_official | 579:53297373a894 | 676 | * \brief Clears a module status flag |
| mbed_official | 579:53297373a894 | 677 | * |
| mbed_official | 579:53297373a894 | 678 | * Clears the given status flag of the module. |
| mbed_official | 579:53297373a894 | 679 | * |
| mbed_official | 579:53297373a894 | 680 | * \note Not all status flags can be cleared. |
| mbed_official | 579:53297373a894 | 681 | * |
| mbed_official | 579:53297373a894 | 682 | * \param[in] module Pointer to the I<SUP>2</SUP>C software device struct |
| mbed_official | 579:53297373a894 | 683 | * \param[in] status_flags Bit mask of status flags to clear |
| mbed_official | 579:53297373a894 | 684 | * |
| mbed_official | 579:53297373a894 | 685 | */ |
| mbed_official | 579:53297373a894 | 686 | void i2c_slave_clear_status( |
| mbed_official | 579:53297373a894 | 687 | struct i2c_slave_module *const module, |
| mbed_official | 579:53297373a894 | 688 | uint32_t status_flags) |
| mbed_official | 579:53297373a894 | 689 | { |
| mbed_official | 579:53297373a894 | 690 | /* Sanity check arguments */ |
| mbed_official | 579:53297373a894 | 691 | Assert(module); |
| mbed_official | 579:53297373a894 | 692 | Assert(module->hw); |
| mbed_official | 579:53297373a894 | 693 | |
| mbed_official | 579:53297373a894 | 694 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
| mbed_official | 579:53297373a894 | 695 | |
| mbed_official | 579:53297373a894 | 696 | /* Clear Address Match flag */ |
| mbed_official | 579:53297373a894 | 697 | if (status_flags & I2C_SLAVE_STATUS_ADDRESS_MATCH) { |
| mbed_official | 579:53297373a894 | 698 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_AMATCH; |
| mbed_official | 579:53297373a894 | 699 | } |
| mbed_official | 579:53297373a894 | 700 | /* Clear Data Ready flag */ |
| mbed_official | 579:53297373a894 | 701 | if (status_flags & I2C_SLAVE_STATUS_DATA_READY) { |
| mbed_official | 579:53297373a894 | 702 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_DRDY; |
| mbed_official | 579:53297373a894 | 703 | } |
| mbed_official | 579:53297373a894 | 704 | /* Clear Stop flag */ |
| mbed_official | 579:53297373a894 | 705 | if (status_flags & I2C_SLAVE_STATUS_STOP_RECEIVED) { |
| mbed_official | 579:53297373a894 | 706 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
| mbed_official | 579:53297373a894 | 707 | } |
| mbed_official | 579:53297373a894 | 708 | /* Clear SCL Low Timeout */ |
| mbed_official | 579:53297373a894 | 709 | if (status_flags & I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT) { |
| mbed_official | 579:53297373a894 | 710 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_LOWTOUT; |
| mbed_official | 579:53297373a894 | 711 | } |
| mbed_official | 579:53297373a894 | 712 | /* Clear Transmit Collision */ |
| mbed_official | 579:53297373a894 | 713 | if (status_flags & I2C_SLAVE_STATUS_COLLISION) { |
| mbed_official | 579:53297373a894 | 714 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_COLL; |
| mbed_official | 579:53297373a894 | 715 | } |
| mbed_official | 579:53297373a894 | 716 | /* Clear Bus Error */ |
| mbed_official | 579:53297373a894 | 717 | if (status_flags & I2C_SLAVE_STATUS_BUS_ERROR) { |
| mbed_official | 579:53297373a894 | 718 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_BUSERR; |
| mbed_official | 579:53297373a894 | 719 | } |
| mbed_official | 579:53297373a894 | 720 | } |
