shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/i2c_api.c@251:de9a1e4ffd79, 2014-07-08 (annotated)

Committer:
mbed_official
Date:
Tue Jul 08 14:15:07 2014 +0100
Revision:
251:de9a1e4ffd79
Parent:
250:a49055e7a707
Child:
285:31249416b6f9
Synchronized with git revision b0ac1e3485a9aa1cb98d1ca68df9d1cdbcd6ce63



Full URL: https://github.com/mbedmicro/mbed/commit/b0ac1e3485a9aa1cb98d1ca68df9d1cdbcd6ce63/



Revert "error.h -> mbed_error.h"

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 251:de9a1e4ffd79 37 #include "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 181:a4cbdfbbd2f4 63 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 181:a4cbdfbbd2f4 64 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 65 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 66 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 67
mbed_official 181:a4cbdfbbd2f4 68 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 69 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 70
mbed_official 181:a4cbdfbbd2f4 71 // Enable I2C clock
mbed_official 181:a4cbdfbbd2f4 72 if (obj->i2c == I2C_1) {
mbed_official 210:45934c3d812a 73 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 74 __I2C1_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 75 }
mbed_official 181:a4cbdfbbd2f4 76 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 77 __I2C2_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 78 }
mbed_official 181:a4cbdfbbd2f4 79
mbed_official 181:a4cbdfbbd2f4 80 // Configure I2C pins
mbed_official 181:a4cbdfbbd2f4 81 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 82 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 83 pin_mode(sda, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 84 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 85
mbed_official 181:a4cbdfbbd2f4 86 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 87 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 88
mbed_official 181:a4cbdfbbd2f4 89 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 90 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 91 }
mbed_official 181:a4cbdfbbd2f4 92
mbed_official 181:a4cbdfbbd2f4 93 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 94 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 95 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 98 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 99 case 100000:
mbed_official 181:a4cbdfbbd2f4 100 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 101 break;
mbed_official 181:a4cbdfbbd2f4 102 case 400000:
mbed_official 181:a4cbdfbbd2f4 103 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 104 break;
mbed_official 181:a4cbdfbbd2f4 105 case 1000000:
mbed_official 181:a4cbdfbbd2f4 106 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 107 break;
mbed_official 181:a4cbdfbbd2f4 108 default:
mbed_official 181:a4cbdfbbd2f4 109 break;
mbed_official 181:a4cbdfbbd2f4 110 }
mbed_official 181:a4cbdfbbd2f4 111
mbed_official 181:a4cbdfbbd2f4 112 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 113 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 116 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 119 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 120 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 121 }
mbed_official 181:a4cbdfbbd2f4 122
mbed_official 181:a4cbdfbbd2f4 123 inline int i2c_start(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 125 int timeout;
mbed_official 181:a4cbdfbbd2f4 126
mbed_official 181:a4cbdfbbd2f4 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 128
mbed_official 181:a4cbdfbbd2f4 129 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 130 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 131
mbed_official 181:a4cbdfbbd2f4 132 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 133 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 134
mbed_official 181:a4cbdfbbd2f4 135 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 136 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 137 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 138 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 139 return 1;
mbed_official 181:a4cbdfbbd2f4 140 }
mbed_official 181:a4cbdfbbd2f4 141 }
mbed_official 181:a4cbdfbbd2f4 142
mbed_official 181:a4cbdfbbd2f4 143 return 0;
mbed_official 181:a4cbdfbbd2f4 144 }
mbed_official 181:a4cbdfbbd2f4 145
mbed_official 181:a4cbdfbbd2f4 146 inline int i2c_stop(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 148
mbed_official 181:a4cbdfbbd2f4 149 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 150 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 151
mbed_official 181:a4cbdfbbd2f4 152 return 0;
mbed_official 181:a4cbdfbbd2f4 153 }
mbed_official 181:a4cbdfbbd2f4 154
mbed_official 181:a4cbdfbbd2f4 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 202:bd6461c07541 156 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 157 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 158 int timeout;
mbed_official 202:bd6461c07541 159 int count;
mbed_official 202:bd6461c07541 160 int value;
mbed_official 202:bd6461c07541 161
mbed_official 202:bd6461c07541 162 /* update CR2 register */
mbed_official 202:bd6461c07541 163 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 164 | (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 165
mbed_official 202:bd6461c07541 166 // Read all bytes
mbed_official 202:bd6461c07541 167 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 168 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 169 data[count] = (char)value;
mbed_official 202:bd6461c07541 170 }
mbed_official 181:a4cbdfbbd2f4 171
mbed_official 202:bd6461c07541 172 // Wait transfer complete
mbed_official 202:bd6461c07541 173 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 175 timeout--;
mbed_official 202:bd6461c07541 176 if (timeout == 0) {
mbed_official 247:135e3186a638 177 return -1;
mbed_official 202:bd6461c07541 178 }
mbed_official 202:bd6461c07541 179 }
mbed_official 211:fb8edfff6ae1 180
mbed_official 211:fb8edfff6ae1 181 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 182
mbed_official 202:bd6461c07541 183 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 184 if (stop) {
mbed_official 202:bd6461c07541 185 i2c_stop(obj);
mbed_official 202:bd6461c07541 186 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 187 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 188 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 189 timeout--;
mbed_official 202:bd6461c07541 190 if (timeout == 0) {
mbed_official 247:135e3186a638 191 return -1;
mbed_official 202:bd6461c07541 192 }
mbed_official 202:bd6461c07541 193 }
mbed_official 202:bd6461c07541 194 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 195 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 196 }
mbed_official 181:a4cbdfbbd2f4 197
mbed_official 181:a4cbdfbbd2f4 198 return length;
mbed_official 181:a4cbdfbbd2f4 199 }
mbed_official 181:a4cbdfbbd2f4 200
mbed_official 181:a4cbdfbbd2f4 201 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 202:bd6461c07541 202 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 203 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 204 int timeout;
mbed_official 202:bd6461c07541 205 int count;
mbed_official 202:bd6461c07541 206
mbed_official 202:bd6461c07541 207 /* update CR2 register */
mbed_official 202:bd6461c07541 208 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 209 | (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 210
mbed_official 202:bd6461c07541 211 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 212 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 213 }
mbed_official 181:a4cbdfbbd2f4 214
mbed_official 202:bd6461c07541 215 // Wait transfer complete
mbed_official 202:bd6461c07541 216 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 217 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 218 timeout--;
mbed_official 202:bd6461c07541 219 if (timeout == 0) {
mbed_official 247:135e3186a638 220 return -1;
mbed_official 211:fb8edfff6ae1 221 }
mbed_official 202:bd6461c07541 222 }
mbed_official 211:fb8edfff6ae1 223
mbed_official 211:fb8edfff6ae1 224 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 225
mbed_official 202:bd6461c07541 226 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 227 if (stop) {
mbed_official 202:bd6461c07541 228 i2c_stop(obj);
mbed_official 202:bd6461c07541 229 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 230 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 232 timeout--;
mbed_official 202:bd6461c07541 233 if (timeout == 0) {
mbed_official 247:135e3186a638 234 return -1;
mbed_official 202:bd6461c07541 235 }
mbed_official 202:bd6461c07541 236 }
mbed_official 202:bd6461c07541 237 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 238 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 239 }
mbed_official 202:bd6461c07541 240
mbed_official 202:bd6461c07541 241 return count;
mbed_official 181:a4cbdfbbd2f4 242 }
mbed_official 181:a4cbdfbbd2f4 243
mbed_official 181:a4cbdfbbd2f4 244 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 245 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 246 int timeout;
mbed_official 181:a4cbdfbbd2f4 247
mbed_official 181:a4cbdfbbd2f4 248 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 249 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 250 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 251 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 252 return -1;
mbed_official 181:a4cbdfbbd2f4 253 }
mbed_official 181:a4cbdfbbd2f4 254 }
mbed_official 181:a4cbdfbbd2f4 255
mbed_official 181:a4cbdfbbd2f4 256 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 257 }
mbed_official 181:a4cbdfbbd2f4 258
mbed_official 181:a4cbdfbbd2f4 259 int i2c_byte_write(i2c_t *obj, int data) {
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 202:bd6461c07541 263 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 264 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 266 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 267 return 0;
mbed_official 181:a4cbdfbbd2f4 268 }
mbed_official 181:a4cbdfbbd2f4 269 }
mbed_official 181:a4cbdfbbd2f4 270
mbed_official 202:bd6461c07541 271 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 272
mbed_official 181:a4cbdfbbd2f4 273 return 1;
mbed_official 181:a4cbdfbbd2f4 274 }
mbed_official 181:a4cbdfbbd2f4 275
mbed_official 181:a4cbdfbbd2f4 276 void i2c_reset(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 277 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 278 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 279 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 280 }
mbed_official 181:a4cbdfbbd2f4 281 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 282 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 283 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 284 }
mbed_official 181:a4cbdfbbd2f4 285 }
mbed_official 181:a4cbdfbbd2f4 286
mbed_official 181:a4cbdfbbd2f4 287 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 288
mbed_official 181:a4cbdfbbd2f4 289 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 290 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 291 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 292
mbed_official 181:a4cbdfbbd2f4 293 // disable
mbed_official 202:bd6461c07541 294 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 295 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 296 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 297 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 298 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 299 // Set new address
mbed_official 181:a4cbdfbbd2f4 300 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 301 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 302 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 303 // enable
mbed_official 181:a4cbdfbbd2f4 304 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 305 }
mbed_official 181:a4cbdfbbd2f4 306
mbed_official 181:a4cbdfbbd2f4 307 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 308
mbed_official 181:a4cbdfbbd2f4 309 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 310 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 311
mbed_official 181:a4cbdfbbd2f4 312 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 313 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 314
mbed_official 181:a4cbdfbbd2f4 315 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 316 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 317 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 318 } else {
mbed_official 202:bd6461c07541 319 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 320 }
mbed_official 181:a4cbdfbbd2f4 321
mbed_official 181:a4cbdfbbd2f4 322 // Set new mode
mbed_official 181:a4cbdfbbd2f4 323 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 324
mbed_official 181:a4cbdfbbd2f4 325 }
mbed_official 181:a4cbdfbbd2f4 326
mbed_official 181:a4cbdfbbd2f4 327 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 328 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 329 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 330 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 331 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 332
mbed_official 181:a4cbdfbbd2f4 333 int i2c_slave_receive(i2c_t *obj) {
mbed_official 202:bd6461c07541 334 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 335 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 336
mbed_official 181:a4cbdfbbd2f4 337 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 338 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 339 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 340 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 341 else
mbed_official 181:a4cbdfbbd2f4 342 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 343 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 344 }
mbed_official 181:a4cbdfbbd2f4 345 }
mbed_official 181:a4cbdfbbd2f4 346
mbed_official 181:a4cbdfbbd2f4 347 return (retValue);
mbed_official 181:a4cbdfbbd2f4 348 }
mbed_official 181:a4cbdfbbd2f4 349
mbed_official 181:a4cbdfbbd2f4 350 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 202:bd6461c07541 351 char size = 0;
mbed_official 211:fb8edfff6ae1 352
mbed_official 202:bd6461c07541 353 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 354
mbed_official 202:bd6461c07541 355 return size;
mbed_official 181:a4cbdfbbd2f4 356 }
mbed_official 181:a4cbdfbbd2f4 357
mbed_official 181:a4cbdfbbd2f4 358 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 359 char size = 0;
mbed_official 202:bd6461c07541 360 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 361
mbed_official 181:a4cbdfbbd2f4 362 do {
mbed_official 181:a4cbdfbbd2f4 363 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 364 size++;
mbed_official 181:a4cbdfbbd2f4 365 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 366
mbed_official 181:a4cbdfbbd2f4 367 return size;
mbed_official 181:a4cbdfbbd2f4 368 }
mbed_official 181:a4cbdfbbd2f4 369
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 372
mbed_official 181:a4cbdfbbd2f4 373 #endif // DEVICE_I2C