Joris Aerts / mbed-src

mbed library sources

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Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F7/i2c_api.c@582:a89625bcd809, 2015-07-06 (annotated)

Committer:
mbed_official
Date:
Mon Jul 06 09:00:34 2015 +0100
Revision:
582:a89625bcd809
Parent:
573:ad23fe03a082 
Synchronized with git revision 45004fb61e4af8f74f4e916318df5207fcf6076d



Full URL: https://github.com/mbedmicro/mbed/commit/45004fb61e4af8f74f4e916318df5207fcf6076d/



DISCO_F746NG - Fix several issues

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 573:ad23fe03a082 1 /* mbed Microcontroller Library
mbed_official 573:ad23fe03a082 2 *******************************************************************************
mbed_official 573:ad23fe03a082 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 573:ad23fe03a082 4 * All rights reserved.
mbed_official 573:ad23fe03a082 5 *
mbed_official 573:ad23fe03a082 6 * Redistribution and use in source and binary forms, with or without
mbed_official 573:ad23fe03a082 7 * modification, are permitted provided that the following conditions are met:
mbed_official 573:ad23fe03a082 8 *
mbed_official 573:ad23fe03a082 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 573:ad23fe03a082 10 * this list of conditions and the following disclaimer.
mbed_official 573:ad23fe03a082 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 573:ad23fe03a082 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 573:ad23fe03a082 13 * and/or other materials provided with the distribution.
mbed_official 573:ad23fe03a082 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 573:ad23fe03a082 15 * may be used to endorse or promote products derived from this software
mbed_official 573:ad23fe03a082 16 * without specific prior written permission.
mbed_official 573:ad23fe03a082 17 *
mbed_official 573:ad23fe03a082 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 573:ad23fe03a082 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 573:ad23fe03a082 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 573:ad23fe03a082 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 573:ad23fe03a082 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 573:ad23fe03a082 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 573:ad23fe03a082 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 573:ad23fe03a082 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 573:ad23fe03a082 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 573:ad23fe03a082 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 573:ad23fe03a082 28 *******************************************************************************
mbed_official 573:ad23fe03a082 29 */
mbed_official 573:ad23fe03a082 30 #include "mbed_assert.h"
mbed_official 573:ad23fe03a082 31 #include "i2c_api.h"
mbed_official 573:ad23fe03a082 32
mbed_official 573:ad23fe03a082 33 #if DEVICE_I2C
mbed_official 573:ad23fe03a082 34
mbed_official 573:ad23fe03a082 35 #include "cmsis.h"
mbed_official 573:ad23fe03a082 36 #include "pinmap.h"
mbed_official 573:ad23fe03a082 37 #include "PeripheralPins.h"
mbed_official 582:a89625bcd809 38 #include "mbed_error.h"
mbed_official 573:ad23fe03a082 39
mbed_official 573:ad23fe03a082 40 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 573:ad23fe03a082 41 not based on accurate values, they just guarantee that the application will
mbed_official 573:ad23fe03a082 42 not remain stuck if the I2C communication is corrupted. */
mbed_official 582:a89625bcd809 43 #define FLAG_TIMEOUT ((int)0x4000)
mbed_official 573:ad23fe03a082 44 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 573:ad23fe03a082 45
mbed_official 573:ad23fe03a082 46 I2C_HandleTypeDef I2cHandle;
mbed_official 573:ad23fe03a082 47
mbed_official 573:ad23fe03a082 48 int i2c1_inited = 0;
mbed_official 582:a89625bcd809 49 /* Ready for next F7 devices
mbed_official 573:ad23fe03a082 50 int i2c2_inited = 0;
mbed_official 573:ad23fe03a082 51 int i2c3_inited = 0;
mbed_official 582:a89625bcd809 52 int i2c4_inited = 0;
mbed_official 582:a89625bcd809 53 */
mbed_official 573:ad23fe03a082 54
mbed_official 573:ad23fe03a082 55 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 573:ad23fe03a082 56 {
mbed_official 573:ad23fe03a082 57 // Determine the I2C to use
mbed_official 573:ad23fe03a082 58 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 59 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 60
mbed_official 573:ad23fe03a082 61 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 573:ad23fe03a082 62 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 573:ad23fe03a082 63
mbed_official 582:a89625bcd809 64 // Enable I2C clock and pinout if not done
mbed_official 573:ad23fe03a082 65 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 573:ad23fe03a082 66 i2c1_inited = 1;
mbed_official 582:a89625bcd809 67 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_PCLK1);
mbed_official 582:a89625bcd809 68 __HAL_RCC_I2C1_CLK_ENABLE();
mbed_official 582:a89625bcd809 69 // Configure I2C1 pins
mbed_official 573:ad23fe03a082 70 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 71 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 72 pin_mode(sda, OpenDrain);
mbed_official 573:ad23fe03a082 73 pin_mode(scl, OpenDrain);
mbed_official 573:ad23fe03a082 74 }
mbed_official 573:ad23fe03a082 75
mbed_official 582:a89625bcd809 76 /* Ready for next F7 devices
mbed_official 582:a89625bcd809 77 #if defined(I2C2_BASE)
mbed_official 582:a89625bcd809 78 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 582:a89625bcd809 79 i2c2_inited = 1;
mbed_official 582:a89625bcd809 80 __HAL_RCC_I2C2_CONFIG(RCC_I2C2CLKSOURCE_PCLK1);
mbed_official 582:a89625bcd809 81 __HAL_RCC_I2C2_CLK_ENABLE();
mbed_official 582:a89625bcd809 82 // Configure I2C2 pins
mbed_official 582:a89625bcd809 83 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 582:a89625bcd809 84 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 582:a89625bcd809 85 pin_mode(sda, OpenDrain);
mbed_official 582:a89625bcd809 86 pin_mode(scl, OpenDrain);
mbed_official 582:a89625bcd809 87 }
mbed_official 582:a89625bcd809 88 #endif
mbed_official 582:a89625bcd809 89
mbed_official 582:a89625bcd809 90 #if defined(I2C3_BASE)
mbed_official 582:a89625bcd809 91 if ((obj->i2c == I2C_3) && !i2c3_inited) {
mbed_official 582:a89625bcd809 92 i2c3_inited = 1;
mbed_official 582:a89625bcd809 93 __HAL_RCC_I2C3_CONFIG(RCC_I2C3CLKSOURCE_PCLK1);
mbed_official 582:a89625bcd809 94 __HAL_RCC_I2C3_CLK_ENABLE();
mbed_official 582:a89625bcd809 95 // Configure I2C3 pins
mbed_official 582:a89625bcd809 96 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 582:a89625bcd809 97 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 582:a89625bcd809 98 pin_mode(sda, OpenDrain);
mbed_official 582:a89625bcd809 99 pin_mode(scl, OpenDrain);
mbed_official 582:a89625bcd809 100 }
mbed_official 582:a89625bcd809 101 #endif
mbed_official 582:a89625bcd809 102
mbed_official 582:a89625bcd809 103 #if defined(I2C4_BASE)
mbed_official 582:a89625bcd809 104 if ((obj->i2c == I2C_4) && !i2c4_inited) {
mbed_official 582:a89625bcd809 105 i2c4_inited = 1;
mbed_official 582:a89625bcd809 106 __HAL_RCC_I2C4_CONFIG(RCC_I2C4CLKSOURCE_PCLK1);
mbed_official 582:a89625bcd809 107 __HAL_RCC_I2C4_CLK_ENABLE();
mbed_official 582:a89625bcd809 108 // Configure I2C4 pins
mbed_official 582:a89625bcd809 109 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 582:a89625bcd809 110 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 582:a89625bcd809 111 pin_mode(sda, OpenDrain);
mbed_official 582:a89625bcd809 112 pin_mode(scl, OpenDrain);
mbed_official 582:a89625bcd809 113 }
mbed_official 582:a89625bcd809 114 #endif
mbed_official 582:a89625bcd809 115 */
mbed_official 582:a89625bcd809 116
mbed_official 573:ad23fe03a082 117 // Reset to clear pending flags if any
mbed_official 573:ad23fe03a082 118 i2c_reset(obj);
mbed_official 573:ad23fe03a082 119
mbed_official 573:ad23fe03a082 120 // I2C configuration
mbed_official 573:ad23fe03a082 121 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 573:ad23fe03a082 122 }
mbed_official 573:ad23fe03a082 123
mbed_official 573:ad23fe03a082 124 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 573:ad23fe03a082 125 {
mbed_official 582:a89625bcd809 126 uint32_t tim = 0;
mbed_official 582:a89625bcd809 127
mbed_official 582:a89625bcd809 128 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 582:a89625bcd809 129
mbed_official 573:ad23fe03a082 130 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 131 int timeout;
mbed_official 573:ad23fe03a082 132
mbed_official 573:ad23fe03a082 133 // wait before init
mbed_official 573:ad23fe03a082 134 timeout = LONG_TIMEOUT;
mbed_official 582:a89625bcd809 135 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)) {}
mbed_official 582:a89625bcd809 136
mbed_official 582:a89625bcd809 137 /*
mbed_official 582:a89625bcd809 138 Values calculated with I2C_Timing_Configuration tool (excel file)
mbed_official 582:a89625bcd809 139 * Standard mode (up to 100 kHz)
mbed_official 582:a89625bcd809 140 * Fast Mode (up to 400 kHz)
mbed_official 582:a89625bcd809 141 * Fast Mode Plus (up to 1 MHz)
mbed_official 582:a89625bcd809 142 Below values obtained with:
mbed_official 582:a89625bcd809 143 - I2Cx clock source = APB1CLK = 54 MHz
mbed_official 582:a89625bcd809 144 - Analog filter delay = ON
mbed_official 582:a89625bcd809 145 - Digital filter coefficient = 0
mbed_official 582:a89625bcd809 146 */
mbed_official 582:a89625bcd809 147 switch (hz) {
mbed_official 582:a89625bcd809 148 case 100000:
mbed_official 582:a89625bcd809 149 tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 582:a89625bcd809 150 break;
mbed_official 582:a89625bcd809 151 case 400000:
mbed_official 582:a89625bcd809 152 tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 582:a89625bcd809 153 break;
mbed_official 582:a89625bcd809 154 case 1000000:
mbed_official 582:a89625bcd809 155 tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 582:a89625bcd809 156 break;
mbed_official 582:a89625bcd809 157 default:
mbed_official 582:a89625bcd809 158 break;
mbed_official 582:a89625bcd809 159 }
mbed_official 573:ad23fe03a082 160
mbed_official 573:ad23fe03a082 161 // I2C configuration
mbed_official 582:a89625bcd809 162 I2cHandle.Init.Timing = tim;
mbed_official 582:a89625bcd809 163 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 582:a89625bcd809 164 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
mbed_official 582:a89625bcd809 165 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
mbed_official 582:a89625bcd809 166 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
mbed_official 582:a89625bcd809 167 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 582:a89625bcd809 168 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 582:a89625bcd809 169 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 582:a89625bcd809 170
mbed_official 582:a89625bcd809 171 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
mbed_official 582:a89625bcd809 172 error("Cannot initialize I2C");
mbed_official 573:ad23fe03a082 173 }
mbed_official 573:ad23fe03a082 174 }
mbed_official 573:ad23fe03a082 175
mbed_official 573:ad23fe03a082 176 inline int i2c_start(i2c_t *obj)
mbed_official 573:ad23fe03a082 177 {
mbed_official 573:ad23fe03a082 178 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 179 int timeout;
mbed_official 573:ad23fe03a082 180
mbed_official 573:ad23fe03a082 181 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 182
mbed_official 573:ad23fe03a082 183 // Clear Acknowledge failure flag
mbed_official 573:ad23fe03a082 184 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 573:ad23fe03a082 185
mbed_official 573:ad23fe03a082 186 // Generate the START condition
mbed_official 582:a89625bcd809 187 i2c->CR2 |= I2C_CR2_START;
mbed_official 573:ad23fe03a082 188
mbed_official 573:ad23fe03a082 189 // Wait the START condition has been correctly sent
mbed_official 573:ad23fe03a082 190 timeout = FLAG_TIMEOUT;
mbed_official 582:a89625bcd809 191 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 573:ad23fe03a082 192 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 193 return 1;
mbed_official 573:ad23fe03a082 194 }
mbed_official 573:ad23fe03a082 195 }
mbed_official 573:ad23fe03a082 196
mbed_official 573:ad23fe03a082 197 return 0;
mbed_official 573:ad23fe03a082 198 }
mbed_official 573:ad23fe03a082 199
mbed_official 573:ad23fe03a082 200 inline int i2c_stop(i2c_t *obj)
mbed_official 573:ad23fe03a082 201 {
mbed_official 573:ad23fe03a082 202 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 203
mbed_official 573:ad23fe03a082 204 // Generate the STOP condition
mbed_official 582:a89625bcd809 205 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 573:ad23fe03a082 206
mbed_official 573:ad23fe03a082 207 return 0;
mbed_official 573:ad23fe03a082 208 }
mbed_official 573:ad23fe03a082 209
mbed_official 573:ad23fe03a082 210 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 573:ad23fe03a082 211 {
mbed_official 573:ad23fe03a082 212 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 213 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 214 int timeout;
mbed_official 573:ad23fe03a082 215 int count;
mbed_official 573:ad23fe03a082 216 int value;
mbed_official 573:ad23fe03a082 217
mbed_official 582:a89625bcd809 218 /* update CR2 register */
mbed_official 582:a89625bcd809 219 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 582:a89625bcd809 220 | (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 573:ad23fe03a082 221
mbed_official 582:a89625bcd809 222 // Read all bytes
mbed_official 582:a89625bcd809 223 for (count = 0; count < length; count++) {
mbed_official 582:a89625bcd809 224 value = i2c_byte_read(obj, 0);
mbed_official 582:a89625bcd809 225 data[count] = (char)value;
mbed_official 582:a89625bcd809 226 }
mbed_official 582:a89625bcd809 227
mbed_official 582:a89625bcd809 228 // Wait transfer complete
mbed_official 582:a89625bcd809 229 timeout = LONG_TIMEOUT;
mbed_official 582:a89625bcd809 230 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 573:ad23fe03a082 231 timeout--;
mbed_official 573:ad23fe03a082 232 if (timeout == 0) {
mbed_official 573:ad23fe03a082 233 return -1;
mbed_official 573:ad23fe03a082 234 }
mbed_official 573:ad23fe03a082 235 }
mbed_official 573:ad23fe03a082 236
mbed_official 582:a89625bcd809 237 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 573:ad23fe03a082 238
mbed_official 573:ad23fe03a082 239 // If not repeated start, send stop.
mbed_official 573:ad23fe03a082 240 if (stop) {
mbed_official 573:ad23fe03a082 241 i2c_stop(obj);
mbed_official 582:a89625bcd809 242 /* Wait until STOPF flag is set */
mbed_official 582:a89625bcd809 243 timeout = FLAG_TIMEOUT;
mbed_official 582:a89625bcd809 244 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 582:a89625bcd809 245 timeout--;
mbed_official 582:a89625bcd809 246 if (timeout == 0) {
mbed_official 582:a89625bcd809 247 return -1;
mbed_official 582:a89625bcd809 248 }
mbed_official 582:a89625bcd809 249 }
mbed_official 582:a89625bcd809 250 /* Clear STOP Flag */
mbed_official 582:a89625bcd809 251 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 573:ad23fe03a082 252 }
mbed_official 573:ad23fe03a082 253
mbed_official 573:ad23fe03a082 254 return length;
mbed_official 573:ad23fe03a082 255 }
mbed_official 573:ad23fe03a082 256
mbed_official 573:ad23fe03a082 257 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 573:ad23fe03a082 258 {
mbed_official 573:ad23fe03a082 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 260 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 261 int timeout;
mbed_official 573:ad23fe03a082 262 int count;
mbed_official 573:ad23fe03a082 263
mbed_official 582:a89625bcd809 264 /* update CR2 register */
mbed_official 582:a89625bcd809 265 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 582:a89625bcd809 266 | (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 573:ad23fe03a082 267
mbed_official 582:a89625bcd809 268 for (count = 0; count < length; count++) {
mbed_official 582:a89625bcd809 269 i2c_byte_write(obj, data[count]);
mbed_official 582:a89625bcd809 270 }
mbed_official 582:a89625bcd809 271
mbed_official 582:a89625bcd809 272 // Wait transfer complete
mbed_official 573:ad23fe03a082 273 timeout = FLAG_TIMEOUT;
mbed_official 582:a89625bcd809 274 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 573:ad23fe03a082 275 timeout--;
mbed_official 573:ad23fe03a082 276 if (timeout == 0) {
mbed_official 573:ad23fe03a082 277 return -1;
mbed_official 573:ad23fe03a082 278 }
mbed_official 573:ad23fe03a082 279 }
mbed_official 573:ad23fe03a082 280
mbed_official 582:a89625bcd809 281 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 573:ad23fe03a082 282
mbed_official 573:ad23fe03a082 283 // If not repeated start, send stop.
mbed_official 573:ad23fe03a082 284 if (stop) {
mbed_official 573:ad23fe03a082 285 i2c_stop(obj);
mbed_official 582:a89625bcd809 286 /* Wait until STOPF flag is set */
mbed_official 582:a89625bcd809 287 timeout = FLAG_TIMEOUT;
mbed_official 582:a89625bcd809 288 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 582:a89625bcd809 289 timeout--;
mbed_official 582:a89625bcd809 290 if (timeout == 0) {
mbed_official 582:a89625bcd809 291 return -1;
mbed_official 582:a89625bcd809 292 }
mbed_official 582:a89625bcd809 293 }
mbed_official 582:a89625bcd809 294 /* Clear STOP Flag */
mbed_official 582:a89625bcd809 295 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 573:ad23fe03a082 296 }
mbed_official 573:ad23fe03a082 297
mbed_official 573:ad23fe03a082 298 return count;
mbed_official 573:ad23fe03a082 299 }
mbed_official 573:ad23fe03a082 300
mbed_official 573:ad23fe03a082 301 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 573:ad23fe03a082 302 {
mbed_official 573:ad23fe03a082 303 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 304 int timeout;
mbed_official 573:ad23fe03a082 305
mbed_official 573:ad23fe03a082 306 // Wait until the byte is received
mbed_official 573:ad23fe03a082 307 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 308 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 573:ad23fe03a082 309 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 310 return -1;
mbed_official 573:ad23fe03a082 311 }
mbed_official 573:ad23fe03a082 312 }
mbed_official 573:ad23fe03a082 313
mbed_official 582:a89625bcd809 314 return (int)i2c->RXDR;
mbed_official 573:ad23fe03a082 315 }
mbed_official 573:ad23fe03a082 316
mbed_official 573:ad23fe03a082 317 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 573:ad23fe03a082 318 {
mbed_official 573:ad23fe03a082 319 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 320 int timeout;
mbed_official 573:ad23fe03a082 321
mbed_official 582:a89625bcd809 322 // Wait until the previous byte is transmitted
mbed_official 573:ad23fe03a082 323 timeout = FLAG_TIMEOUT;
mbed_official 582:a89625bcd809 324 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 573:ad23fe03a082 325 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 326 return 0;
mbed_official 573:ad23fe03a082 327 }
mbed_official 573:ad23fe03a082 328 }
mbed_official 573:ad23fe03a082 329
mbed_official 582:a89625bcd809 330 i2c->TXDR = (uint8_t)data;
mbed_official 582:a89625bcd809 331
mbed_official 573:ad23fe03a082 332 return 1;
mbed_official 573:ad23fe03a082 333 }
mbed_official 573:ad23fe03a082 334
mbed_official 573:ad23fe03a082 335 void i2c_reset(i2c_t *obj)
mbed_official 573:ad23fe03a082 336 {
mbed_official 573:ad23fe03a082 337 int timeout;
mbed_official 573:ad23fe03a082 338
mbed_official 573:ad23fe03a082 339 // wait before reset
mbed_official 573:ad23fe03a082 340 timeout = LONG_TIMEOUT;
mbed_official 573:ad23fe03a082 341 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 573:ad23fe03a082 342
mbed_official 582:a89625bcd809 343 __I2C1_FORCE_RESET();
mbed_official 582:a89625bcd809 344 __I2C1_RELEASE_RESET();
mbed_official 573:ad23fe03a082 345 }
mbed_official 573:ad23fe03a082 346
mbed_official 573:ad23fe03a082 347 #if DEVICE_I2CSLAVE
mbed_official 573:ad23fe03a082 348
mbed_official 573:ad23fe03a082 349 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 573:ad23fe03a082 350 {
mbed_official 573:ad23fe03a082 351 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 582:a89625bcd809 352 uint16_t tmpreg;
mbed_official 573:ad23fe03a082 353
mbed_official 582:a89625bcd809 354 // disable
mbed_official 582:a89625bcd809 355 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 573:ad23fe03a082 356 // Get the old register value
mbed_official 573:ad23fe03a082 357 tmpreg = i2c->OAR1;
mbed_official 573:ad23fe03a082 358 // Reset address bits
mbed_official 573:ad23fe03a082 359 tmpreg &= 0xFC00;
mbed_official 573:ad23fe03a082 360 // Set new address
mbed_official 573:ad23fe03a082 361 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 573:ad23fe03a082 362 // Store the new register value
mbed_official 573:ad23fe03a082 363 i2c->OAR1 = tmpreg;
mbed_official 582:a89625bcd809 364 // enable
mbed_official 582:a89625bcd809 365 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 573:ad23fe03a082 366 }
mbed_official 573:ad23fe03a082 367
mbed_official 573:ad23fe03a082 368 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 573:ad23fe03a082 369 {
mbed_official 582:a89625bcd809 370
mbed_official 582:a89625bcd809 371 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 582:a89625bcd809 372 uint16_t tmpreg;
mbed_official 582:a89625bcd809 373
mbed_official 582:a89625bcd809 374 // Get the old register value
mbed_official 582:a89625bcd809 375 tmpreg = i2c->OAR1;
mbed_official 582:a89625bcd809 376
mbed_official 582:a89625bcd809 377 // Enable / disable slave
mbed_official 582:a89625bcd809 378 if (enable_slave == 1) {
mbed_official 582:a89625bcd809 379 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 582:a89625bcd809 380 } else {
mbed_official 582:a89625bcd809 381 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 573:ad23fe03a082 382 }
mbed_official 582:a89625bcd809 383
mbed_official 582:a89625bcd809 384 // Set new mode
mbed_official 582:a89625bcd809 385 i2c->OAR1 = tmpreg;
mbed_official 582:a89625bcd809 386
mbed_official 573:ad23fe03a082 387 }
mbed_official 573:ad23fe03a082 388
mbed_official 573:ad23fe03a082 389 // See I2CSlave.h
mbed_official 573:ad23fe03a082 390 #define NoData 0 // the slave has not been addressed
mbed_official 573:ad23fe03a082 391 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 573:ad23fe03a082 392 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 573:ad23fe03a082 393 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 573:ad23fe03a082 394
mbed_official 573:ad23fe03a082 395 int i2c_slave_receive(i2c_t *obj)
mbed_official 573:ad23fe03a082 396 {
mbed_official 582:a89625bcd809 397 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 398 int retValue = NoData;
mbed_official 573:ad23fe03a082 399
mbed_official 573:ad23fe03a082 400 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 573:ad23fe03a082 401 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 582:a89625bcd809 402 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 573:ad23fe03a082 403 retValue = ReadAddressed;
mbed_official 573:ad23fe03a082 404 else
mbed_official 573:ad23fe03a082 405 retValue = WriteAddressed;
mbed_official 573:ad23fe03a082 406 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 573:ad23fe03a082 407 }
mbed_official 573:ad23fe03a082 408 }
mbed_official 573:ad23fe03a082 409
mbed_official 573:ad23fe03a082 410 return (retValue);
mbed_official 573:ad23fe03a082 411 }
mbed_official 573:ad23fe03a082 412
mbed_official 573:ad23fe03a082 413 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 573:ad23fe03a082 414 {
mbed_official 582:a89625bcd809 415 char size = 0;
mbed_official 573:ad23fe03a082 416
mbed_official 582:a89625bcd809 417 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 573:ad23fe03a082 418
mbed_official 573:ad23fe03a082 419 return size;
mbed_official 573:ad23fe03a082 420 }
mbed_official 573:ad23fe03a082 421
mbed_official 573:ad23fe03a082 422 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 573:ad23fe03a082 423 {
mbed_official 582:a89625bcd809 424 char size = 0;
mbed_official 573:ad23fe03a082 425 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 426
mbed_official 582:a89625bcd809 427 do {
mbed_official 582:a89625bcd809 428 i2c_byte_write(obj, data[size]);
mbed_official 573:ad23fe03a082 429 size++;
mbed_official 582:a89625bcd809 430 } while (size < length);
mbed_official 573:ad23fe03a082 431
mbed_official 573:ad23fe03a082 432 return size;
mbed_official 573:ad23fe03a082 433 }
mbed_official 573:ad23fe03a082 434
mbed_official 573:ad23fe03a082 435
mbed_official 573:ad23fe03a082 436 #endif // DEVICE_I2CSLAVE
mbed_official 573:ad23fe03a082 437
mbed_official 573:ad23fe03a082 438 #endif // DEVICE_I2C