Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/i2c_api.c@306:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
306:1f0269907d8b
Parent:
247:135e3186a638 
Synchronized with git revision f304c6ba83591678388024d30440e94781fa8d65



Full URL: https://github.com/mbedmicro/mbed/commit/f304c6ba83591678388024d30440e94781fa8d65/



[NUCLEOs] enhance i2c api

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 219:993c9b0acbcc 1 /* mbed Microcontroller Library
mbed_official 219:993c9b0acbcc 2 *******************************************************************************
mbed_official 219:993c9b0acbcc 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 219:993c9b0acbcc 4 * All rights reserved.
mbed_official 219:993c9b0acbcc 5 *
mbed_official 219:993c9b0acbcc 6 * Redistribution and use in source and binary forms, with or without
mbed_official 219:993c9b0acbcc 7 * modification, are permitted provided that the following conditions are met:
mbed_official 219:993c9b0acbcc 8 *
mbed_official 219:993c9b0acbcc 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 219:993c9b0acbcc 10 * this list of conditions and the following disclaimer.
mbed_official 219:993c9b0acbcc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 219:993c9b0acbcc 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 219:993c9b0acbcc 13 * and/or other materials provided with the distribution.
mbed_official 219:993c9b0acbcc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 219:993c9b0acbcc 15 * may be used to endorse or promote products derived from this software
mbed_official 219:993c9b0acbcc 16 * without specific prior written permission.
mbed_official 219:993c9b0acbcc 17 *
mbed_official 219:993c9b0acbcc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 219:993c9b0acbcc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 219:993c9b0acbcc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 219:993c9b0acbcc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 219:993c9b0acbcc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 219:993c9b0acbcc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 219:993c9b0acbcc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 219:993c9b0acbcc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 219:993c9b0acbcc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 219:993c9b0acbcc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 219:993c9b0acbcc 28 *******************************************************************************
mbed_official 219:993c9b0acbcc 29 */
mbed_official 239:8cadf13dff33 30 #include "mbed_assert.h"
mbed_official 219:993c9b0acbcc 31 #include "i2c_api.h"
mbed_official 219:993c9b0acbcc 32
mbed_official 219:993c9b0acbcc 33 #if DEVICE_I2C
mbed_official 219:993c9b0acbcc 34
mbed_official 219:993c9b0acbcc 35 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 36 #include "pinmap.h"
mbed_official 219:993c9b0acbcc 37
mbed_official 219:993c9b0acbcc 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 219:993c9b0acbcc 39 not based on accurate values, they just guarantee that the application will
mbed_official 219:993c9b0acbcc 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 219:993c9b0acbcc 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 219:993c9b0acbcc 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 219:993c9b0acbcc 43
mbed_official 219:993c9b0acbcc 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 219:993c9b0acbcc 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 48 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 49 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 50 };
mbed_official 219:993c9b0acbcc 51
mbed_official 219:993c9b0acbcc 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 219:993c9b0acbcc 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 55 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 56 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 57 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 58 };
mbed_official 219:993c9b0acbcc 59
mbed_official 219:993c9b0acbcc 60 I2C_HandleTypeDef I2cHandle;
mbed_official 219:993c9b0acbcc 61
mbed_official 306:1f0269907d8b 62 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 63 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 64
mbed_official 219:993c9b0acbcc 65 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 219:993c9b0acbcc 66 // Determine the I2C to use
mbed_official 219:993c9b0acbcc 67 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 68 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 69
mbed_official 219:993c9b0acbcc 70 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 239:8cadf13dff33 71 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 219:993c9b0acbcc 72
mbed_official 306:1f0269907d8b 73 // Enable I2C1 clock and pinout if not done
mbed_official 306:1f0269907d8b 74 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 75 i2c1_inited = 1;
mbed_official 219:993c9b0acbcc 76 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 219:993c9b0acbcc 77 __I2C1_CLK_ENABLE();
mbed_official 306:1f0269907d8b 78 // Configure I2C pins
mbed_official 306:1f0269907d8b 79 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 80 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 81 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 82 pin_mode(scl, OpenDrain);
mbed_official 219:993c9b0acbcc 83 }
mbed_official 306:1f0269907d8b 84 // Enable I2C2 clock and pinout if not done
mbed_official 306:1f0269907d8b 85 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 86 i2c2_inited = 1;
mbed_official 219:993c9b0acbcc 87 __I2C2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 88 // Configure I2C pins
mbed_official 219:993c9b0acbcc 89 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 90 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 91 pin_mode(sda, OpenDrain);
mbed_official 219:993c9b0acbcc 92 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 93 }
mbed_official 219:993c9b0acbcc 94
mbed_official 219:993c9b0acbcc 95 // Reset to clear pending flags if any
mbed_official 219:993c9b0acbcc 96 i2c_reset(obj);
mbed_official 219:993c9b0acbcc 97
mbed_official 219:993c9b0acbcc 98 // I2C configuration
mbed_official 219:993c9b0acbcc 99 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 219:993c9b0acbcc 100 }
mbed_official 219:993c9b0acbcc 101
mbed_official 219:993c9b0acbcc 102 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 239:8cadf13dff33 103 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 306:1f0269907d8b 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 105 int timeout;
mbed_official 239:8cadf13dff33 106
mbed_official 306:1f0269907d8b 107 // wait before init
mbed_official 306:1f0269907d8b 108 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 109 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 219:993c9b0acbcc 110
mbed_official 219:993c9b0acbcc 111 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 219:993c9b0acbcc 112 switch (hz) {
mbed_official 219:993c9b0acbcc 113 case 100000:
mbed_official 219:993c9b0acbcc 114 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 115 break;
mbed_official 219:993c9b0acbcc 116 case 400000:
mbed_official 219:993c9b0acbcc 117 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 118 break;
mbed_official 219:993c9b0acbcc 119 case 1000000:
mbed_official 219:993c9b0acbcc 120 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 121 break;
mbed_official 219:993c9b0acbcc 122 default:
mbed_official 219:993c9b0acbcc 123 break;
mbed_official 219:993c9b0acbcc 124 }
mbed_official 219:993c9b0acbcc 125
mbed_official 219:993c9b0acbcc 126 // I2C configuration
mbed_official 219:993c9b0acbcc 127 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 219:993c9b0acbcc 128 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 219:993c9b0acbcc 129 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 219:993c9b0acbcc 130 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 219:993c9b0acbcc 131 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 219:993c9b0acbcc 132 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 219:993c9b0acbcc 133 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 219:993c9b0acbcc 134 HAL_I2C_Init(&I2cHandle);
mbed_official 219:993c9b0acbcc 135 }
mbed_official 219:993c9b0acbcc 136
mbed_official 219:993c9b0acbcc 137 inline int i2c_start(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 138 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 139 int timeout;
mbed_official 219:993c9b0acbcc 140
mbed_official 219:993c9b0acbcc 141 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 142
mbed_official 219:993c9b0acbcc 143 // Clear Acknowledge failure flag
mbed_official 219:993c9b0acbcc 144 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 219:993c9b0acbcc 145
mbed_official 219:993c9b0acbcc 146 // Generate the START condition
mbed_official 219:993c9b0acbcc 147 i2c->CR2 |= I2C_CR2_START;
mbed_official 219:993c9b0acbcc 148
mbed_official 219:993c9b0acbcc 149 // Wait the START condition has been correctly sent
mbed_official 219:993c9b0acbcc 150 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 151 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 219:993c9b0acbcc 152 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 153 return 1;
mbed_official 219:993c9b0acbcc 154 }
mbed_official 219:993c9b0acbcc 155 }
mbed_official 219:993c9b0acbcc 156
mbed_official 219:993c9b0acbcc 157 return 0;
mbed_official 219:993c9b0acbcc 158 }
mbed_official 219:993c9b0acbcc 159
mbed_official 219:993c9b0acbcc 160 inline int i2c_stop(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 161 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 162
mbed_official 219:993c9b0acbcc 163 // Generate the STOP condition
mbed_official 219:993c9b0acbcc 164 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 219:993c9b0acbcc 165
mbed_official 219:993c9b0acbcc 166 return 0;
mbed_official 219:993c9b0acbcc 167 }
mbed_official 219:993c9b0acbcc 168
mbed_official 219:993c9b0acbcc 169 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 219:993c9b0acbcc 170 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 171 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 172 int timeout;
mbed_official 219:993c9b0acbcc 173 int count;
mbed_official 219:993c9b0acbcc 174 int value;
mbed_official 219:993c9b0acbcc 175
mbed_official 219:993c9b0acbcc 176 /* update CR2 register */
mbed_official 219:993c9b0acbcc 177 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
mbed_official 219:993c9b0acbcc 178 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_READ);
mbed_official 219:993c9b0acbcc 179
mbed_official 219:993c9b0acbcc 180 // Read all bytes
mbed_official 219:993c9b0acbcc 181 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 182 value = i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 183 data[count] = (char)value;
mbed_official 219:993c9b0acbcc 184 }
mbed_official 219:993c9b0acbcc 185
mbed_official 219:993c9b0acbcc 186 // Wait transfer complete
mbed_official 219:993c9b0acbcc 187 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 188 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 189 timeout--;
mbed_official 219:993c9b0acbcc 190 if (timeout == 0) {
mbed_official 247:135e3186a638 191 return -1;
mbed_official 219:993c9b0acbcc 192 }
mbed_official 219:993c9b0acbcc 193 }
mbed_official 219:993c9b0acbcc 194 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 195
mbed_official 219:993c9b0acbcc 196 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 197 if (stop) {
mbed_official 219:993c9b0acbcc 198 i2c_stop(obj);
mbed_official 219:993c9b0acbcc 199 /* Wait until STOPF flag is set */
mbed_official 219:993c9b0acbcc 200 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 201 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 202 timeout--;
mbed_official 219:993c9b0acbcc 203 if (timeout == 0) {
mbed_official 247:135e3186a638 204 return -1;
mbed_official 219:993c9b0acbcc 205 }
mbed_official 219:993c9b0acbcc 206 }
mbed_official 219:993c9b0acbcc 207 /* Clear STOP Flag */
mbed_official 219:993c9b0acbcc 208 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 209 }
mbed_official 219:993c9b0acbcc 210
mbed_official 219:993c9b0acbcc 211 return length;
mbed_official 219:993c9b0acbcc 212 }
mbed_official 219:993c9b0acbcc 213
mbed_official 219:993c9b0acbcc 214 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 219:993c9b0acbcc 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 216 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 217 int timeout;
mbed_official 219:993c9b0acbcc 218 int count;
mbed_official 219:993c9b0acbcc 219
mbed_official 219:993c9b0acbcc 220 /* update CR2 register */
mbed_official 219:993c9b0acbcc 221 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
mbed_official 219:993c9b0acbcc 222 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_WRITE);
mbed_official 219:993c9b0acbcc 223
mbed_official 219:993c9b0acbcc 224
mbed_official 219:993c9b0acbcc 225
mbed_official 219:993c9b0acbcc 226 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 227 i2c_byte_write(obj, data[count]);
mbed_official 219:993c9b0acbcc 228 }
mbed_official 219:993c9b0acbcc 229
mbed_official 219:993c9b0acbcc 230 // Wait transfer complete
mbed_official 219:993c9b0acbcc 231 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 232 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 233 timeout--;
mbed_official 219:993c9b0acbcc 234 if (timeout == 0) {
mbed_official 247:135e3186a638 235 return -1;
mbed_official 219:993c9b0acbcc 236 }
mbed_official 219:993c9b0acbcc 237 }
mbed_official 219:993c9b0acbcc 238 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 239
mbed_official 219:993c9b0acbcc 240 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 241 if (stop) {
mbed_official 219:993c9b0acbcc 242 i2c_stop(obj);
mbed_official 219:993c9b0acbcc 243 /* Wait until STOPF flag is set */
mbed_official 219:993c9b0acbcc 244 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 245 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 246 timeout--;
mbed_official 219:993c9b0acbcc 247 if (timeout == 0) {
mbed_official 247:135e3186a638 248 return -1;
mbed_official 219:993c9b0acbcc 249 }
mbed_official 219:993c9b0acbcc 250 }
mbed_official 219:993c9b0acbcc 251 /* Clear STOP Flag */
mbed_official 219:993c9b0acbcc 252 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 253 }
mbed_official 219:993c9b0acbcc 254
mbed_official 219:993c9b0acbcc 255 return count;
mbed_official 219:993c9b0acbcc 256 }
mbed_official 219:993c9b0acbcc 257
mbed_official 219:993c9b0acbcc 258 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 219:993c9b0acbcc 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 260 int timeout;
mbed_official 219:993c9b0acbcc 261
mbed_official 219:993c9b0acbcc 262 // Wait until the byte is received
mbed_official 219:993c9b0acbcc 263 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 264 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 219:993c9b0acbcc 265 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 266 return -1;
mbed_official 219:993c9b0acbcc 267 }
mbed_official 219:993c9b0acbcc 268 }
mbed_official 219:993c9b0acbcc 269
mbed_official 219:993c9b0acbcc 270 return (int)i2c->RXDR;
mbed_official 219:993c9b0acbcc 271 }
mbed_official 219:993c9b0acbcc 272
mbed_official 219:993c9b0acbcc 273 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 219:993c9b0acbcc 274 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 275 int timeout;
mbed_official 219:993c9b0acbcc 276
mbed_official 219:993c9b0acbcc 277 // Wait until the previous byte is transmitted
mbed_official 219:993c9b0acbcc 278 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 279 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 219:993c9b0acbcc 280 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 281 return 0;
mbed_official 219:993c9b0acbcc 282 }
mbed_official 219:993c9b0acbcc 283 }
mbed_official 219:993c9b0acbcc 284
mbed_official 219:993c9b0acbcc 285 i2c->TXDR = (uint8_t)data;
mbed_official 219:993c9b0acbcc 286
mbed_official 219:993c9b0acbcc 287 return 1;
mbed_official 219:993c9b0acbcc 288 }
mbed_official 219:993c9b0acbcc 289
mbed_official 219:993c9b0acbcc 290 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 291 int timeout;
mbed_official 306:1f0269907d8b 292
mbed_official 306:1f0269907d8b 293 // wait before reset
mbed_official 306:1f0269907d8b 294 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 295 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 296
mbed_official 219:993c9b0acbcc 297 if (obj->i2c == I2C_1) {
mbed_official 219:993c9b0acbcc 298 __I2C1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 299 __I2C1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 300 }
mbed_official 219:993c9b0acbcc 301 if (obj->i2c == I2C_2) {
mbed_official 219:993c9b0acbcc 302 __I2C2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 303 __I2C2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 304 }
mbed_official 219:993c9b0acbcc 305 }
mbed_official 219:993c9b0acbcc 306
mbed_official 219:993c9b0acbcc 307 #if DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 308
mbed_official 219:993c9b0acbcc 309 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 219:993c9b0acbcc 310 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 311 uint16_t tmpreg = 0;
mbed_official 219:993c9b0acbcc 312
mbed_official 219:993c9b0acbcc 313 // disable
mbed_official 219:993c9b0acbcc 314 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 315 // Get the old register value
mbed_official 219:993c9b0acbcc 316 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 317 // Reset address bits
mbed_official 219:993c9b0acbcc 318 tmpreg &= 0xFC00;
mbed_official 219:993c9b0acbcc 319 // Set new address
mbed_official 219:993c9b0acbcc 320 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 219:993c9b0acbcc 321 // Store the new register value
mbed_official 219:993c9b0acbcc 322 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 323 // enable
mbed_official 219:993c9b0acbcc 324 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 325 }
mbed_official 219:993c9b0acbcc 326
mbed_official 219:993c9b0acbcc 327 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 219:993c9b0acbcc 328
mbed_official 219:993c9b0acbcc 329 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 330 uint16_t tmpreg;
mbed_official 219:993c9b0acbcc 331
mbed_official 219:993c9b0acbcc 332 // Get the old register value
mbed_official 219:993c9b0acbcc 333 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 334
mbed_official 219:993c9b0acbcc 335 // Enable / disable slave
mbed_official 219:993c9b0acbcc 336 if (enable_slave == 1) {
mbed_official 219:993c9b0acbcc 337 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 338 } else {
mbed_official 219:993c9b0acbcc 339 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 340 }
mbed_official 219:993c9b0acbcc 341
mbed_official 219:993c9b0acbcc 342 // Set new mode
mbed_official 219:993c9b0acbcc 343 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 344
mbed_official 219:993c9b0acbcc 345 }
mbed_official 219:993c9b0acbcc 346
mbed_official 219:993c9b0acbcc 347 // See I2CSlave.h
mbed_official 219:993c9b0acbcc 348 #define NoData 0 // the slave has not been addressed
mbed_official 219:993c9b0acbcc 349 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 219:993c9b0acbcc 350 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 219:993c9b0acbcc 351 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 219:993c9b0acbcc 352
mbed_official 219:993c9b0acbcc 353 int i2c_slave_receive(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 354 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 355 int retValue = NoData;
mbed_official 219:993c9b0acbcc 356
mbed_official 219:993c9b0acbcc 357 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 219:993c9b0acbcc 358 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 219:993c9b0acbcc 359 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 219:993c9b0acbcc 360 retValue = ReadAddressed;
mbed_official 219:993c9b0acbcc 361 else
mbed_official 219:993c9b0acbcc 362 retValue = WriteAddressed;
mbed_official 219:993c9b0acbcc 363
mbed_official 219:993c9b0acbcc 364 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 219:993c9b0acbcc 365 }
mbed_official 219:993c9b0acbcc 366 }
mbed_official 219:993c9b0acbcc 367
mbed_official 219:993c9b0acbcc 368 return (retValue);
mbed_official 219:993c9b0acbcc 369 }
mbed_official 219:993c9b0acbcc 370
mbed_official 219:993c9b0acbcc 371 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 219:993c9b0acbcc 372 char size = 0;
mbed_official 219:993c9b0acbcc 373
mbed_official 219:993c9b0acbcc 374 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 375
mbed_official 219:993c9b0acbcc 376 return size;
mbed_official 219:993c9b0acbcc 377 }
mbed_official 219:993c9b0acbcc 378
mbed_official 219:993c9b0acbcc 379 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 219:993c9b0acbcc 380 char size = 0;
mbed_official 219:993c9b0acbcc 381 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 382
mbed_official 219:993c9b0acbcc 383 do {
mbed_official 219:993c9b0acbcc 384 i2c_byte_write(obj, data[size]);
mbed_official 219:993c9b0acbcc 385 size++;
mbed_official 219:993c9b0acbcc 386 } while (size < length);
mbed_official 219:993c9b0acbcc 387
mbed_official 219:993c9b0acbcc 388 return size;
mbed_official 219:993c9b0acbcc 389 }
mbed_official 219:993c9b0acbcc 390
mbed_official 219:993c9b0acbcc 391
mbed_official 219:993c9b0acbcc 392 #endif // DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 393
mbed_official 219:993c9b0acbcc 394 #endif // DEVICE_I2C