mbed library sources
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targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/i2c_api.c@118:b44c45162f28, 2014-03-14 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Mar 14 10:00:07 2014 +0000
- Revision:
- 118:b44c45162f28
- Parent:
- 80:66393a7b209d
- Child:
- 129:0182c99221bc
Synchronized with git revision 7d88efe969a293d8fee496c7c1f902f359c40af8
Full URL: https://github.com/mbedmicro/mbed/commit/7d88efe969a293d8fee496c7c1f902f359c40af8/
Add additional peripherie for ST Nucleo L152 board
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 76:aeb1df146756 | 1 | /* mbed Microcontroller Library |
mbed_official | 76:aeb1df146756 | 2 | ******************************************************************************* |
mbed_official | 76:aeb1df146756 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 76:aeb1df146756 | 4 | * All rights reserved. |
mbed_official | 76:aeb1df146756 | 5 | * |
mbed_official | 76:aeb1df146756 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 76:aeb1df146756 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 76:aeb1df146756 | 8 | * |
mbed_official | 76:aeb1df146756 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 76:aeb1df146756 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 76:aeb1df146756 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 76:aeb1df146756 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 76:aeb1df146756 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 76:aeb1df146756 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 76:aeb1df146756 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 76:aeb1df146756 | 16 | * without specific prior written permission. |
mbed_official | 76:aeb1df146756 | 17 | * |
mbed_official | 76:aeb1df146756 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 76:aeb1df146756 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 76:aeb1df146756 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 76:aeb1df146756 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 76:aeb1df146756 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 76:aeb1df146756 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 76:aeb1df146756 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 76:aeb1df146756 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 76:aeb1df146756 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 76:aeb1df146756 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 76:aeb1df146756 | 28 | ******************************************************************************* |
mbed_official | 76:aeb1df146756 | 29 | */ |
mbed_official | 76:aeb1df146756 | 30 | #include "i2c_api.h" |
mbed_official | 76:aeb1df146756 | 31 | |
mbed_official | 76:aeb1df146756 | 32 | #if DEVICE_I2C |
mbed_official | 76:aeb1df146756 | 33 | |
mbed_official | 76:aeb1df146756 | 34 | #include "cmsis.h" |
mbed_official | 76:aeb1df146756 | 35 | #include "pinmap.h" |
mbed_official | 76:aeb1df146756 | 36 | #include "error.h" |
mbed_official | 76:aeb1df146756 | 37 | |
mbed_official | 76:aeb1df146756 | 38 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 76:aeb1df146756 | 39 | not based on accurate values, they just guarantee that the application will |
mbed_official | 76:aeb1df146756 | 40 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 76:aeb1df146756 | 41 | #define FLAG_TIMEOUT ((int)0x1000) |
mbed_official | 76:aeb1df146756 | 42 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 76:aeb1df146756 | 43 | |
mbed_official | 76:aeb1df146756 | 44 | static const PinMap PinMap_I2C_SDA[] = { |
mbed_official | 118:b44c45162f28 | 45 | {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)}, |
mbed_official | 80:66393a7b209d | 46 | {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)}, |
mbed_official | 118:b44c45162f28 | 47 | {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)}, |
mbed_official | 76:aeb1df146756 | 48 | {NC, NC, 0} |
mbed_official | 76:aeb1df146756 | 49 | }; |
mbed_official | 76:aeb1df146756 | 50 | |
mbed_official | 76:aeb1df146756 | 51 | static const PinMap PinMap_I2C_SCL[] = { |
mbed_official | 118:b44c45162f28 | 52 | {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)}, |
mbed_official | 80:66393a7b209d | 53 | {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)}, |
mbed_official | 118:b44c45162f28 | 54 | {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)}, |
mbed_official | 76:aeb1df146756 | 55 | {NC, NC, 0} |
mbed_official | 76:aeb1df146756 | 56 | }; |
mbed_official | 76:aeb1df146756 | 57 | |
mbed_official | 76:aeb1df146756 | 58 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
mbed_official | 76:aeb1df146756 | 59 | // Determine the I2C to use |
mbed_official | 76:aeb1df146756 | 60 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 76:aeb1df146756 | 61 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 76:aeb1df146756 | 62 | |
mbed_official | 76:aeb1df146756 | 63 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 76:aeb1df146756 | 64 | |
mbed_official | 76:aeb1df146756 | 65 | if (obj->i2c == (I2CName)NC) { |
mbed_official | 76:aeb1df146756 | 66 | error("I2C pin mapping failed"); |
mbed_official | 76:aeb1df146756 | 67 | } |
mbed_official | 76:aeb1df146756 | 68 | |
mbed_official | 76:aeb1df146756 | 69 | // Enable I2C clock |
mbed_official | 76:aeb1df146756 | 70 | if (obj->i2c == I2C_1) { |
mbed_official | 76:aeb1df146756 | 71 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); |
mbed_official | 76:aeb1df146756 | 72 | } |
mbed_official | 76:aeb1df146756 | 73 | if (obj->i2c == I2C_2) { |
mbed_official | 76:aeb1df146756 | 74 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE); |
mbed_official | 76:aeb1df146756 | 75 | } |
mbed_official | 76:aeb1df146756 | 76 | |
mbed_official | 76:aeb1df146756 | 77 | // Configure I2C pins |
mbed_official | 80:66393a7b209d | 78 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 80:66393a7b209d | 79 | pin_mode(scl, OpenDrain); |
mbed_official | 76:aeb1df146756 | 80 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 76:aeb1df146756 | 81 | pin_mode(sda, OpenDrain); |
mbed_official | 76:aeb1df146756 | 82 | |
mbed_official | 76:aeb1df146756 | 83 | // Reset to clear pending flags if any |
mbed_official | 76:aeb1df146756 | 84 | i2c_reset(obj); |
mbed_official | 76:aeb1df146756 | 85 | |
mbed_official | 76:aeb1df146756 | 86 | // I2C configuration |
mbed_official | 76:aeb1df146756 | 87 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 76:aeb1df146756 | 88 | } |
mbed_official | 76:aeb1df146756 | 89 | |
mbed_official | 76:aeb1df146756 | 90 | void i2c_frequency(i2c_t *obj, int hz) { |
mbed_official | 76:aeb1df146756 | 91 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 92 | I2C_InitTypeDef I2C_InitStructure; |
mbed_official | 76:aeb1df146756 | 93 | |
mbed_official | 76:aeb1df146756 | 94 | if ((hz != 0) && (hz <= 400000)) { |
mbed_official | 80:66393a7b209d | 95 | I2C_DeInit(i2c); |
mbed_official | 80:66393a7b209d | 96 | |
mbed_official | 76:aeb1df146756 | 97 | // I2C configuration |
mbed_official | 76:aeb1df146756 | 98 | I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; |
mbed_official | 76:aeb1df146756 | 99 | I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; |
mbed_official | 76:aeb1df146756 | 100 | I2C_InitStructure.I2C_OwnAddress1 = 0; |
mbed_official | 76:aeb1df146756 | 101 | I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; |
mbed_official | 76:aeb1df146756 | 102 | I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; |
mbed_official | 76:aeb1df146756 | 103 | I2C_InitStructure.I2C_ClockSpeed = hz; |
mbed_official | 80:66393a7b209d | 104 | I2C_Init(i2c, &I2C_InitStructure); |
mbed_official | 80:66393a7b209d | 105 | |
mbed_official | 76:aeb1df146756 | 106 | I2C_Cmd(i2c, ENABLE); |
mbed_official | 76:aeb1df146756 | 107 | } |
mbed_official | 76:aeb1df146756 | 108 | } |
mbed_official | 76:aeb1df146756 | 109 | |
mbed_official | 76:aeb1df146756 | 110 | inline int i2c_start(i2c_t *obj) { |
mbed_official | 76:aeb1df146756 | 111 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 112 | int timeout; |
mbed_official | 76:aeb1df146756 | 113 | |
mbed_official | 76:aeb1df146756 | 114 | I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag |
mbed_official | 76:aeb1df146756 | 115 | |
mbed_official | 76:aeb1df146756 | 116 | // Generate the START condition |
mbed_official | 76:aeb1df146756 | 117 | I2C_GenerateSTART(i2c, ENABLE); |
mbed_official | 76:aeb1df146756 | 118 | |
mbed_official | 76:aeb1df146756 | 119 | // Wait the START condition has been correctly sent |
mbed_official | 76:aeb1df146756 | 120 | timeout = FLAG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 121 | //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) { |
mbed_official | 76:aeb1df146756 | 122 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) { |
mbed_official | 80:66393a7b209d | 123 | timeout--; |
mbed_official | 80:66393a7b209d | 124 | if (timeout == 0) { |
mbed_official | 80:66393a7b209d | 125 | return 1; |
mbed_official | 80:66393a7b209d | 126 | } |
mbed_official | 76:aeb1df146756 | 127 | } |
mbed_official | 76:aeb1df146756 | 128 | |
mbed_official | 76:aeb1df146756 | 129 | return 0; |
mbed_official | 76:aeb1df146756 | 130 | } |
mbed_official | 76:aeb1df146756 | 131 | |
mbed_official | 76:aeb1df146756 | 132 | inline int i2c_stop(i2c_t *obj) { |
mbed_official | 76:aeb1df146756 | 133 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 134 | |
mbed_official | 76:aeb1df146756 | 135 | I2C_GenerateSTOP(i2c, ENABLE); |
mbed_official | 76:aeb1df146756 | 136 | |
mbed_official | 76:aeb1df146756 | 137 | return 0; |
mbed_official | 76:aeb1df146756 | 138 | } |
mbed_official | 76:aeb1df146756 | 139 | |
mbed_official | 76:aeb1df146756 | 140 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
mbed_official | 76:aeb1df146756 | 141 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 142 | int timeout; |
mbed_official | 76:aeb1df146756 | 143 | int count; |
mbed_official | 76:aeb1df146756 | 144 | int value; |
mbed_official | 76:aeb1df146756 | 145 | |
mbed_official | 76:aeb1df146756 | 146 | if (length == 0) return 0; |
mbed_official | 76:aeb1df146756 | 147 | |
mbed_official | 76:aeb1df146756 | 148 | /* |
mbed_official | 76:aeb1df146756 | 149 | // Wait until the bus is not busy anymore |
mbed_official | 76:aeb1df146756 | 150 | timeout = LONG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 151 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) { |
mbed_official | 80:66393a7b209d | 152 | timeout--; |
mbed_official | 80:66393a7b209d | 153 | if (timeout == 0) { |
mbed_official | 76:aeb1df146756 | 154 | return 0; |
mbed_official | 76:aeb1df146756 | 155 | } |
mbed_official | 76:aeb1df146756 | 156 | } |
mbed_official | 76:aeb1df146756 | 157 | */ |
mbed_official | 76:aeb1df146756 | 158 | |
mbed_official | 76:aeb1df146756 | 159 | i2c_start(obj); |
mbed_official | 76:aeb1df146756 | 160 | |
mbed_official | 76:aeb1df146756 | 161 | // Send slave address for read |
mbed_official | 76:aeb1df146756 | 162 | I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver); |
mbed_official | 76:aeb1df146756 | 163 | |
mbed_official | 76:aeb1df146756 | 164 | // Wait address is acknowledged |
mbed_official | 76:aeb1df146756 | 165 | timeout = FLAG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 166 | while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) { |
mbed_official | 80:66393a7b209d | 167 | timeout--; |
mbed_official | 80:66393a7b209d | 168 | if (timeout == 0) { |
mbed_official | 80:66393a7b209d | 169 | return 0; |
mbed_official | 80:66393a7b209d | 170 | } |
mbed_official | 76:aeb1df146756 | 171 | } |
mbed_official | 76:aeb1df146756 | 172 | |
mbed_official | 76:aeb1df146756 | 173 | // Read all bytes except last one |
mbed_official | 76:aeb1df146756 | 174 | for (count = 0; count < (length - 1); count++) { |
mbed_official | 76:aeb1df146756 | 175 | value = i2c_byte_read(obj, 0); |
mbed_official | 76:aeb1df146756 | 176 | data[count] = (char)value; |
mbed_official | 76:aeb1df146756 | 177 | } |
mbed_official | 76:aeb1df146756 | 178 | |
mbed_official | 76:aeb1df146756 | 179 | // If not repeated start, send stop. |
mbed_official | 76:aeb1df146756 | 180 | // Warning: must be done BEFORE the data is read. |
mbed_official | 76:aeb1df146756 | 181 | if (stop) { |
mbed_official | 76:aeb1df146756 | 182 | i2c_stop(obj); |
mbed_official | 76:aeb1df146756 | 183 | } |
mbed_official | 76:aeb1df146756 | 184 | |
mbed_official | 76:aeb1df146756 | 185 | // Read the last byte |
mbed_official | 76:aeb1df146756 | 186 | value = i2c_byte_read(obj, 1); |
mbed_official | 76:aeb1df146756 | 187 | data[count] = (char)value; |
mbed_official | 76:aeb1df146756 | 188 | |
mbed_official | 76:aeb1df146756 | 189 | return length; |
mbed_official | 76:aeb1df146756 | 190 | } |
mbed_official | 76:aeb1df146756 | 191 | |
mbed_official | 76:aeb1df146756 | 192 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
mbed_official | 76:aeb1df146756 | 193 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 194 | int timeout; |
mbed_official | 76:aeb1df146756 | 195 | int count; |
mbed_official | 76:aeb1df146756 | 196 | |
mbed_official | 76:aeb1df146756 | 197 | /* |
mbed_official | 76:aeb1df146756 | 198 | // Wait until the bus is not busy anymore |
mbed_official | 76:aeb1df146756 | 199 | timeout = LONG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 200 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) { |
mbed_official | 80:66393a7b209d | 201 | timeout--; |
mbed_official | 80:66393a7b209d | 202 | if (timeout == 0) { |
mbed_official | 76:aeb1df146756 | 203 | return 0; |
mbed_official | 76:aeb1df146756 | 204 | } |
mbed_official | 76:aeb1df146756 | 205 | } |
mbed_official | 76:aeb1df146756 | 206 | */ |
mbed_official | 76:aeb1df146756 | 207 | |
mbed_official | 76:aeb1df146756 | 208 | i2c_start(obj); |
mbed_official | 76:aeb1df146756 | 209 | |
mbed_official | 76:aeb1df146756 | 210 | // Send slave address for write |
mbed_official | 76:aeb1df146756 | 211 | I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter); |
mbed_official | 76:aeb1df146756 | 212 | |
mbed_official | 76:aeb1df146756 | 213 | // Wait address is acknowledged |
mbed_official | 76:aeb1df146756 | 214 | timeout = FLAG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 215 | while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) { |
mbed_official | 80:66393a7b209d | 216 | timeout--; |
mbed_official | 80:66393a7b209d | 217 | if (timeout == 0) { |
mbed_official | 80:66393a7b209d | 218 | return 0; |
mbed_official | 80:66393a7b209d | 219 | } |
mbed_official | 76:aeb1df146756 | 220 | } |
mbed_official | 76:aeb1df146756 | 221 | |
mbed_official | 76:aeb1df146756 | 222 | for (count = 0; count < length; count++) { |
mbed_official | 76:aeb1df146756 | 223 | if (i2c_byte_write(obj, data[count]) != 1) { |
mbed_official | 76:aeb1df146756 | 224 | i2c_stop(obj); |
mbed_official | 76:aeb1df146756 | 225 | return 0; |
mbed_official | 76:aeb1df146756 | 226 | } |
mbed_official | 76:aeb1df146756 | 227 | } |
mbed_official | 76:aeb1df146756 | 228 | |
mbed_official | 76:aeb1df146756 | 229 | // If not repeated start, send stop. |
mbed_official | 76:aeb1df146756 | 230 | if (stop) { |
mbed_official | 76:aeb1df146756 | 231 | i2c_stop(obj); |
mbed_official | 76:aeb1df146756 | 232 | } |
mbed_official | 76:aeb1df146756 | 233 | |
mbed_official | 76:aeb1df146756 | 234 | return count; |
mbed_official | 76:aeb1df146756 | 235 | } |
mbed_official | 76:aeb1df146756 | 236 | |
mbed_official | 76:aeb1df146756 | 237 | int i2c_byte_read(i2c_t *obj, int last) { |
mbed_official | 76:aeb1df146756 | 238 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 239 | uint8_t data; |
mbed_official | 76:aeb1df146756 | 240 | int timeout; |
mbed_official | 76:aeb1df146756 | 241 | |
mbed_official | 76:aeb1df146756 | 242 | if (last) { |
mbed_official | 76:aeb1df146756 | 243 | // Don't acknowledge the last byte |
mbed_official | 76:aeb1df146756 | 244 | I2C_AcknowledgeConfig(i2c, DISABLE); |
mbed_official | 76:aeb1df146756 | 245 | } else { |
mbed_official | 76:aeb1df146756 | 246 | // Acknowledge the byte |
mbed_official | 76:aeb1df146756 | 247 | I2C_AcknowledgeConfig(i2c, ENABLE); |
mbed_official | 76:aeb1df146756 | 248 | } |
mbed_official | 76:aeb1df146756 | 249 | |
mbed_official | 76:aeb1df146756 | 250 | // Wait until the byte is received |
mbed_official | 76:aeb1df146756 | 251 | timeout = FLAG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 252 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 80:66393a7b209d | 253 | timeout--; |
mbed_official | 80:66393a7b209d | 254 | if (timeout == 0) { |
mbed_official | 80:66393a7b209d | 255 | return 0; |
mbed_official | 80:66393a7b209d | 256 | } |
mbed_official | 76:aeb1df146756 | 257 | } |
mbed_official | 76:aeb1df146756 | 258 | |
mbed_official | 76:aeb1df146756 | 259 | data = I2C_ReceiveData(i2c); |
mbed_official | 76:aeb1df146756 | 260 | |
mbed_official | 76:aeb1df146756 | 261 | return (int)data; |
mbed_official | 76:aeb1df146756 | 262 | } |
mbed_official | 76:aeb1df146756 | 263 | |
mbed_official | 76:aeb1df146756 | 264 | int i2c_byte_write(i2c_t *obj, int data) { |
mbed_official | 76:aeb1df146756 | 265 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 266 | int timeout; |
mbed_official | 76:aeb1df146756 | 267 | |
mbed_official | 76:aeb1df146756 | 268 | I2C_SendData(i2c, (uint8_t)data); |
mbed_official | 76:aeb1df146756 | 269 | |
mbed_official | 76:aeb1df146756 | 270 | // Wait until the byte is transmitted |
mbed_official | 76:aeb1df146756 | 271 | timeout = FLAG_TIMEOUT; |
mbed_official | 76:aeb1df146756 | 272 | //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) { |
mbed_official | 76:aeb1df146756 | 273 | while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) && |
mbed_official | 76:aeb1df146756 | 274 | (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) { |
mbed_official | 80:66393a7b209d | 275 | timeout--; |
mbed_official | 80:66393a7b209d | 276 | if (timeout == 0) { |
mbed_official | 76:aeb1df146756 | 277 | return 0; |
mbed_official | 76:aeb1df146756 | 278 | } |
mbed_official | 76:aeb1df146756 | 279 | } |
mbed_official | 76:aeb1df146756 | 280 | |
mbed_official | 76:aeb1df146756 | 281 | return 1; |
mbed_official | 76:aeb1df146756 | 282 | } |
mbed_official | 76:aeb1df146756 | 283 | |
mbed_official | 76:aeb1df146756 | 284 | void i2c_reset(i2c_t *obj) { |
mbed_official | 76:aeb1df146756 | 285 | if (obj->i2c == I2C_1) { |
mbed_official | 76:aeb1df146756 | 286 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE); |
mbed_official | 76:aeb1df146756 | 287 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE); |
mbed_official | 76:aeb1df146756 | 288 | } |
mbed_official | 76:aeb1df146756 | 289 | if (obj->i2c == I2C_2) { |
mbed_official | 76:aeb1df146756 | 290 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE); |
mbed_official | 76:aeb1df146756 | 291 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE); |
mbed_official | 76:aeb1df146756 | 292 | } |
mbed_official | 76:aeb1df146756 | 293 | } |
mbed_official | 76:aeb1df146756 | 294 | |
mbed_official | 76:aeb1df146756 | 295 | #if DEVICE_I2CSLAVE |
mbed_official | 76:aeb1df146756 | 296 | |
mbed_official | 76:aeb1df146756 | 297 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
mbed_official | 76:aeb1df146756 | 298 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 76:aeb1df146756 | 299 | uint16_t tmpreg; |
mbed_official | 76:aeb1df146756 | 300 | |
mbed_official | 76:aeb1df146756 | 301 | // Get the old register value |
mbed_official | 76:aeb1df146756 | 302 | tmpreg = i2c->OAR1; |
mbed_official | 76:aeb1df146756 | 303 | // Reset address bits |
mbed_official | 76:aeb1df146756 | 304 | tmpreg &= 0xFC00; |
mbed_official | 76:aeb1df146756 | 305 | // Set new address |
mbed_official | 76:aeb1df146756 | 306 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 76:aeb1df146756 | 307 | // Store the new register value |
mbed_official | 76:aeb1df146756 | 308 | i2c->OAR1 = tmpreg; |
mbed_official | 76:aeb1df146756 | 309 | } |
mbed_official | 76:aeb1df146756 | 310 | |
mbed_official | 76:aeb1df146756 | 311 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
mbed_official | 76:aeb1df146756 | 312 | // Nothing to do |
mbed_official | 76:aeb1df146756 | 313 | } |
mbed_official | 76:aeb1df146756 | 314 | |
mbed_official | 76:aeb1df146756 | 315 | // See I2CSlave.h |
mbed_official | 76:aeb1df146756 | 316 | #define NoData 0 // the slave has not been addressed |
mbed_official | 76:aeb1df146756 | 317 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 76:aeb1df146756 | 318 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 76:aeb1df146756 | 319 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 76:aeb1df146756 | 320 | |
mbed_official | 76:aeb1df146756 | 321 | int i2c_slave_receive(i2c_t *obj) { |
mbed_official | 76:aeb1df146756 | 322 | // TO BE DONE |
mbed_official | 76:aeb1df146756 | 323 | return(0); |
mbed_official | 76:aeb1df146756 | 324 | } |
mbed_official | 76:aeb1df146756 | 325 | |
mbed_official | 76:aeb1df146756 | 326 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
mbed_official | 76:aeb1df146756 | 327 | int count = 0; |
mbed_official | 76:aeb1df146756 | 328 | |
mbed_official | 76:aeb1df146756 | 329 | // Read all bytes |
mbed_official | 76:aeb1df146756 | 330 | for (count = 0; count < length; count++) { |
mbed_official | 76:aeb1df146756 | 331 | data[count] = i2c_byte_read(obj, 0); |
mbed_official | 76:aeb1df146756 | 332 | } |
mbed_official | 76:aeb1df146756 | 333 | |
mbed_official | 76:aeb1df146756 | 334 | return count; |
mbed_official | 76:aeb1df146756 | 335 | } |
mbed_official | 76:aeb1df146756 | 336 | |
mbed_official | 76:aeb1df146756 | 337 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
mbed_official | 76:aeb1df146756 | 338 | int count = 0; |
mbed_official | 76:aeb1df146756 | 339 | |
mbed_official | 76:aeb1df146756 | 340 | // Write all bytes |
mbed_official | 76:aeb1df146756 | 341 | for (count = 0; count < length; count++) { |
mbed_official | 76:aeb1df146756 | 342 | i2c_byte_write(obj, data[count]); |
mbed_official | 76:aeb1df146756 | 343 | } |
mbed_official | 76:aeb1df146756 | 344 | |
mbed_official | 76:aeb1df146756 | 345 | return count; |
mbed_official | 76:aeb1df146756 | 346 | } |
mbed_official | 76:aeb1df146756 | 347 | |
mbed_official | 76:aeb1df146756 | 348 | |
mbed_official | 76:aeb1df146756 | 349 | #endif // DEVICE_I2CSLAVE |
mbed_official | 76:aeb1df146756 | 350 | |
mbed_official | 76:aeb1df146756 | 351 | #endif // DEVICE_I2C |