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_L053R8/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:
286:31249416b6f9 
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 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 181:a4cbdfbbd2f4 31 #include "i2c_api.h"
mbed_official 181:a4cbdfbbd2f4 32
mbed_official 181:a4cbdfbbd2f4 33 #if DEVICE_I2C
mbed_official 181:a4cbdfbbd2f4 34
mbed_official 181:a4cbdfbbd2f4 35 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "pinmap.h"
mbed_official 286:31249416b6f9 37 #include "mbed_error.h"
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 181:a4cbdfbbd2f4 40 not based on accurate values, they just guarantee that the application will
mbed_official 181:a4cbdfbbd2f4 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 181:a4cbdfbbd2f4 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 181:a4cbdfbbd2f4 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 181:a4cbdfbbd2f4 44
mbed_official 181:a4cbdfbbd2f4 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 181:a4cbdfbbd2f4 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 48 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 49 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 50 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 51 };
mbed_official 181:a4cbdfbbd2f4 52
mbed_official 181:a4cbdfbbd2f4 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 181:a4cbdfbbd2f4 54 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 55 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 56 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 57 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 58 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 59 };
mbed_official 181:a4cbdfbbd2f4 60
mbed_official 181:a4cbdfbbd2f4 61 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 62
mbed_official 306:1f0269907d8b 63 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 64 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 65
mbed_official 181:a4cbdfbbd2f4 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 181:a4cbdfbbd2f4 67 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 70
mbed_official 181:a4cbdfbbd2f4 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 73
mbed_official 306:1f0269907d8b 74 // Enable I2C1 clock and pinout if not done
mbed_official 306:1f0269907d8b 75 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 76 i2c1_inited = 1;
mbed_official 210:45934c3d812a 77 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 78 __I2C1_CLK_ENABLE();
mbed_official 306:1f0269907d8b 79 // Configure I2C pins
mbed_official 306:1f0269907d8b 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 82 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 83 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 84 }
mbed_official 306:1f0269907d8b 85 // Enable I2C2 clock and pinout if not done
mbed_official 306:1f0269907d8b 86 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 87 i2c2_inited = 1;
mbed_official 306:1f0269907d8b 88 __I2C2_CLK_ENABLE();
mbed_official 306:1f0269907d8b 89 // Configure I2C pins
mbed_official 306:1f0269907d8b 90 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 91 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 92 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 93 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 94 }
mbed_official 181:a4cbdfbbd2f4 95
mbed_official 181:a4cbdfbbd2f4 96 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 97 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 98
mbed_official 181:a4cbdfbbd2f4 99 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 100 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 101 }
mbed_official 181:a4cbdfbbd2f4 102
mbed_official 181:a4cbdfbbd2f4 103 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 104 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 105 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 106 int timeout;
mbed_official 306:1f0269907d8b 107
mbed_official 306:1f0269907d8b 108 // wait before init
mbed_official 306:1f0269907d8b 109 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 110 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 181:a4cbdfbbd2f4 111
mbed_official 181:a4cbdfbbd2f4 112 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 113 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 114 case 100000:
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 116 break;
mbed_official 181:a4cbdfbbd2f4 117 case 400000:
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 119 break;
mbed_official 181:a4cbdfbbd2f4 120 case 1000000:
mbed_official 181:a4cbdfbbd2f4 121 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 122 break;
mbed_official 181:a4cbdfbbd2f4 123 default:
mbed_official 181:a4cbdfbbd2f4 124 break;
mbed_official 181:a4cbdfbbd2f4 125 }
mbed_official 181:a4cbdfbbd2f4 126
mbed_official 181:a4cbdfbbd2f4 127 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 129 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 130 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 131 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 132 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 133 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 134 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 135 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 136 }
mbed_official 181:a4cbdfbbd2f4 137
mbed_official 181:a4cbdfbbd2f4 138 inline int i2c_start(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 139 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 140 int timeout;
mbed_official 181:a4cbdfbbd2f4 141
mbed_official 181:a4cbdfbbd2f4 142 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 143
mbed_official 181:a4cbdfbbd2f4 144 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 145 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 146
mbed_official 181:a4cbdfbbd2f4 147 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 148 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 149
mbed_official 181:a4cbdfbbd2f4 150 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 151 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 152 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 153 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 154 return 1;
mbed_official 181:a4cbdfbbd2f4 155 }
mbed_official 181:a4cbdfbbd2f4 156 }
mbed_official 181:a4cbdfbbd2f4 157
mbed_official 181:a4cbdfbbd2f4 158 return 0;
mbed_official 181:a4cbdfbbd2f4 159 }
mbed_official 181:a4cbdfbbd2f4 160
mbed_official 181:a4cbdfbbd2f4 161 inline int i2c_stop(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 163
mbed_official 181:a4cbdfbbd2f4 164 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 165 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 166
mbed_official 181:a4cbdfbbd2f4 167 return 0;
mbed_official 181:a4cbdfbbd2f4 168 }
mbed_official 181:a4cbdfbbd2f4 169
mbed_official 181:a4cbdfbbd2f4 170 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 202:bd6461c07541 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 172 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 173 int timeout;
mbed_official 202:bd6461c07541 174 int count;
mbed_official 202:bd6461c07541 175 int value;
mbed_official 202:bd6461c07541 176
mbed_official 202:bd6461c07541 177 /* update CR2 register */
mbed_official 202:bd6461c07541 178 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 211:fb8edfff6ae1 179 | (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 211:fb8edfff6ae1 180
mbed_official 202:bd6461c07541 181 // Read all bytes
mbed_official 202:bd6461c07541 182 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 183 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 184 data[count] = (char)value;
mbed_official 202:bd6461c07541 185 }
mbed_official 181:a4cbdfbbd2f4 186
mbed_official 202:bd6461c07541 187 // Wait transfer complete
mbed_official 202:bd6461c07541 188 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 189 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 190 timeout--;
mbed_official 202:bd6461c07541 191 if (timeout == 0) {
mbed_official 247:135e3186a638 192 return -1;
mbed_official 202:bd6461c07541 193 }
mbed_official 202:bd6461c07541 194 }
mbed_official 211:fb8edfff6ae1 195
mbed_official 211:fb8edfff6ae1 196 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 197
mbed_official 202:bd6461c07541 198 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 199 if (stop) {
mbed_official 202:bd6461c07541 200 i2c_stop(obj);
mbed_official 202:bd6461c07541 201 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 202 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 203 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 204 timeout--;
mbed_official 202:bd6461c07541 205 if (timeout == 0) {
mbed_official 247:135e3186a638 206 return -1;
mbed_official 202:bd6461c07541 207 }
mbed_official 202:bd6461c07541 208 }
mbed_official 202:bd6461c07541 209 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 210 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 211 }
mbed_official 181:a4cbdfbbd2f4 212
mbed_official 181:a4cbdfbbd2f4 213 return length;
mbed_official 181:a4cbdfbbd2f4 214 }
mbed_official 181:a4cbdfbbd2f4 215
mbed_official 181:a4cbdfbbd2f4 216 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 202:bd6461c07541 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 218 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 219 int timeout;
mbed_official 202:bd6461c07541 220 int count;
mbed_official 202:bd6461c07541 221
mbed_official 202:bd6461c07541 222 /* update CR2 register */
mbed_official 202:bd6461c07541 223 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 211:fb8edfff6ae1 224 | (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 181:a4cbdfbbd2f4 225
mbed_official 202:bd6461c07541 226 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 227 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 228 }
mbed_official 181:a4cbdfbbd2f4 229
mbed_official 202:bd6461c07541 230 // Wait transfer complete
mbed_official 202:bd6461c07541 231 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 232 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 233 timeout--;
mbed_official 202:bd6461c07541 234 if (timeout == 0) {
mbed_official 247:135e3186a638 235 return -1;
mbed_official 211:fb8edfff6ae1 236 }
mbed_official 202:bd6461c07541 237 }
mbed_official 211:fb8edfff6ae1 238
mbed_official 211:fb8edfff6ae1 239 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 240
mbed_official 202:bd6461c07541 241 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 242 if (stop) {
mbed_official 202:bd6461c07541 243 i2c_stop(obj);
mbed_official 202:bd6461c07541 244 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 245 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 246 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 247 timeout--;
mbed_official 202:bd6461c07541 248 if (timeout == 0) {
mbed_official 247:135e3186a638 249 return -1;
mbed_official 202:bd6461c07541 250 }
mbed_official 202:bd6461c07541 251 }
mbed_official 202:bd6461c07541 252 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 253 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 254 }
mbed_official 202:bd6461c07541 255
mbed_official 202:bd6461c07541 256 return count;
mbed_official 181:a4cbdfbbd2f4 257 }
mbed_official 181:a4cbdfbbd2f4 258
mbed_official 181:a4cbdfbbd2f4 259 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 261 int timeout;
mbed_official 181:a4cbdfbbd2f4 262
mbed_official 181:a4cbdfbbd2f4 263 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 264 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 266 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 267 return -1;
mbed_official 181:a4cbdfbbd2f4 268 }
mbed_official 181:a4cbdfbbd2f4 269 }
mbed_official 181:a4cbdfbbd2f4 270
mbed_official 181:a4cbdfbbd2f4 271 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 272 }
mbed_official 181:a4cbdfbbd2f4 273
mbed_official 181:a4cbdfbbd2f4 274 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 181:a4cbdfbbd2f4 275 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 276 int timeout;
mbed_official 181:a4cbdfbbd2f4 277
mbed_official 202:bd6461c07541 278 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 279 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 280 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 281 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 282 return 0;
mbed_official 181:a4cbdfbbd2f4 283 }
mbed_official 181:a4cbdfbbd2f4 284 }
mbed_official 181:a4cbdfbbd2f4 285
mbed_official 202:bd6461c07541 286 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 287
mbed_official 181:a4cbdfbbd2f4 288 return 1;
mbed_official 181:a4cbdfbbd2f4 289 }
mbed_official 181:a4cbdfbbd2f4 290
mbed_official 181:a4cbdfbbd2f4 291 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 292 int timeout;
mbed_official 306:1f0269907d8b 293
mbed_official 306:1f0269907d8b 294 // wait before reset
mbed_official 306:1f0269907d8b 295 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 296 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 297
mbed_official 181:a4cbdfbbd2f4 298 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 299 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 300 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 301 }
mbed_official 181:a4cbdfbbd2f4 302 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 303 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 304 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 305 }
mbed_official 181:a4cbdfbbd2f4 306 }
mbed_official 181:a4cbdfbbd2f4 307
mbed_official 181:a4cbdfbbd2f4 308 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 309
mbed_official 181:a4cbdfbbd2f4 310 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 311 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 312 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 313
mbed_official 181:a4cbdfbbd2f4 314 // disable
mbed_official 202:bd6461c07541 315 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 316 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 317 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 318 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 319 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 320 // Set new address
mbed_official 181:a4cbdfbbd2f4 321 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 322 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 323 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 324 // enable
mbed_official 181:a4cbdfbbd2f4 325 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 326 }
mbed_official 181:a4cbdfbbd2f4 327
mbed_official 181:a4cbdfbbd2f4 328 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 329
mbed_official 181:a4cbdfbbd2f4 330 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 331 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 332
mbed_official 181:a4cbdfbbd2f4 333 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 334 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 335
mbed_official 181:a4cbdfbbd2f4 336 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 337 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 338 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 339 } else {
mbed_official 202:bd6461c07541 340 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 341 }
mbed_official 181:a4cbdfbbd2f4 342
mbed_official 181:a4cbdfbbd2f4 343 // Set new mode
mbed_official 181:a4cbdfbbd2f4 344 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 345
mbed_official 181:a4cbdfbbd2f4 346 }
mbed_official 181:a4cbdfbbd2f4 347
mbed_official 181:a4cbdfbbd2f4 348 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 349 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 350 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 351 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 352 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 353
mbed_official 181:a4cbdfbbd2f4 354 int i2c_slave_receive(i2c_t *obj) {
mbed_official 202:bd6461c07541 355 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 356 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 357
mbed_official 181:a4cbdfbbd2f4 358 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 359 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 360 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 361 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 362 else
mbed_official 181:a4cbdfbbd2f4 363 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 364 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 365 }
mbed_official 181:a4cbdfbbd2f4 366 }
mbed_official 181:a4cbdfbbd2f4 367
mbed_official 181:a4cbdfbbd2f4 368 return (retValue);
mbed_official 181:a4cbdfbbd2f4 369 }
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 202:bd6461c07541 372 char size = 0;
mbed_official 211:fb8edfff6ae1 373
mbed_official 202:bd6461c07541 374 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 202:bd6461c07541 376 return size;
mbed_official 181:a4cbdfbbd2f4 377 }
mbed_official 181:a4cbdfbbd2f4 378
mbed_official 181:a4cbdfbbd2f4 379 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 380 char size = 0;
mbed_official 202:bd6461c07541 381 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 382
mbed_official 181:a4cbdfbbd2f4 383 do {
mbed_official 181:a4cbdfbbd2f4 384 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 385 size++;
mbed_official 181:a4cbdfbbd2f4 386 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 387
mbed_official 181:a4cbdfbbd2f4 388 return size;
mbed_official 181:a4cbdfbbd2f4 389 }
mbed_official 181:a4cbdfbbd2f4 390
mbed_official 181:a4cbdfbbd2f4 391
mbed_official 181:a4cbdfbbd2f4 392 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 393
mbed_official 181:a4cbdfbbd2f4 394 #endif // DEVICE_I2C