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_F334R8/i2c_api.c@272:949bd8bf133b, 2014-08-05 (annotated)

Committer:
mbed_official
Date:
Tue Aug 05 14:30:06 2014 +0100
Revision:
272:949bd8bf133b
Parent:
247:135e3186a638
Child:
305:1f0269907d8b
Synchronized with git revision c94c2511429f830048973a9ae14cfbbb46cc3b4d



Full URL: https://github.com/mbedmicro/mbed/commit/c94c2511429f830048973a9ae14cfbbb46cc3b4d/



[NUCLEO_F334R8] Fix I2C clock issue

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 237:f3da66175598 1 /* mbed Microcontroller Library
mbed_official 237:f3da66175598 2 *******************************************************************************
mbed_official 237:f3da66175598 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 237:f3da66175598 4 * All rights reserved.
mbed_official 237:f3da66175598 5 *
mbed_official 237:f3da66175598 6 * Redistribution and use in source and binary forms, with or without
mbed_official 237:f3da66175598 7 * modification, are permitted provided that the following conditions are met:
mbed_official 237:f3da66175598 8 *
mbed_official 237:f3da66175598 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 237:f3da66175598 10 * this list of conditions and the following disclaimer.
mbed_official 237:f3da66175598 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 237:f3da66175598 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 237:f3da66175598 13 * and/or other materials provided with the distribution.
mbed_official 237:f3da66175598 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 237:f3da66175598 15 * may be used to endorse or promote products derived from this software
mbed_official 237:f3da66175598 16 * without specific prior written permission.
mbed_official 237:f3da66175598 17 *
mbed_official 237:f3da66175598 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 237:f3da66175598 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 237:f3da66175598 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 237:f3da66175598 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 237:f3da66175598 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 237:f3da66175598 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 237:f3da66175598 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 237:f3da66175598 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 237:f3da66175598 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 237:f3da66175598 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 237:f3da66175598 28 *******************************************************************************
mbed_official 237:f3da66175598 29 */
mbed_official 237:f3da66175598 30 #include "mbed_assert.h"
mbed_official 237:f3da66175598 31 #include "i2c_api.h"
mbed_official 237:f3da66175598 32
mbed_official 237:f3da66175598 33 #if DEVICE_I2C
mbed_official 237:f3da66175598 34
mbed_official 237:f3da66175598 35 #include "cmsis.h"
mbed_official 237:f3da66175598 36 #include "pinmap.h"
mbed_official 237:f3da66175598 37
mbed_official 237:f3da66175598 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 237:f3da66175598 39 not based on accurate values, they just guarantee that the application will
mbed_official 237:f3da66175598 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 237:f3da66175598 41 #define FLAG_TIMEOUT ((int)0x4000)
mbed_official 237:f3da66175598 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 237:f3da66175598 43
mbed_official 237:f3da66175598 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 237:f3da66175598 45 {PA_14, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 48 {NC, NC, 0}
mbed_official 237:f3da66175598 49 };
mbed_official 237:f3da66175598 50
mbed_official 237:f3da66175598 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 237:f3da66175598 52 {PA_15, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 237:f3da66175598 55 {NC, NC, 0}
mbed_official 237:f3da66175598 56 };
mbed_official 237:f3da66175598 57
mbed_official 237:f3da66175598 58 I2C_HandleTypeDef I2cHandle;
mbed_official 237:f3da66175598 59
mbed_official 237:f3da66175598 60 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 237:f3da66175598 61 {
mbed_official 237:f3da66175598 62 // Determine the I2C to use
mbed_official 237:f3da66175598 63 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 237:f3da66175598 64 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 237:f3da66175598 65
mbed_official 237:f3da66175598 66 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 237:f3da66175598 67 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 237:f3da66175598 68
mbed_official 237:f3da66175598 69 // Enable I2C clock
mbed_official 237:f3da66175598 70 __I2C1_CLK_ENABLE();
mbed_official 237:f3da66175598 71
mbed_official 272:949bd8bf133b 72 // Configure the I2C clock source
mbed_official 272:949bd8bf133b 73 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 272:949bd8bf133b 74
mbed_official 237:f3da66175598 75 // Configure I2C pins
mbed_official 237:f3da66175598 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 237:f3da66175598 77 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 237:f3da66175598 78 pin_mode(sda, OpenDrain);
mbed_official 237:f3da66175598 79 pin_mode(scl, OpenDrain);
mbed_official 237:f3da66175598 80
mbed_official 237:f3da66175598 81 // Reset to clear pending flags if any
mbed_official 237:f3da66175598 82 i2c_reset(obj);
mbed_official 237:f3da66175598 83
mbed_official 237:f3da66175598 84 // I2C configuration
mbed_official 237:f3da66175598 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 237:f3da66175598 86 }
mbed_official 237:f3da66175598 87
mbed_official 237:f3da66175598 88 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 237:f3da66175598 89 {
mbed_official 237:f3da66175598 90 uint32_t tim = 0;
mbed_official 237:f3da66175598 91
mbed_official 237:f3da66175598 92 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 237:f3da66175598 93
mbed_official 237:f3da66175598 94 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 95
mbed_official 237:f3da66175598 96 // Update the SystemCoreClock variable.
mbed_official 237:f3da66175598 97 SystemCoreClockUpdate();
mbed_official 237:f3da66175598 98
mbed_official 237:f3da66175598 99 /*
mbed_official 237:f3da66175598 100 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 237:f3da66175598 101 * Standard mode (up to 100 kHz)
mbed_official 237:f3da66175598 102 * Fast Mode (up to 400 kHz)
mbed_official 237:f3da66175598 103 * Fast Mode Plus (up to 1 MHz)
mbed_official 237:f3da66175598 104 Below values obtained with:
mbed_official 237:f3da66175598 105 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 237:f3da66175598 106 - Analog filter delay = ON
mbed_official 237:f3da66175598 107 - Digital filter coefficient = 0
mbed_official 237:f3da66175598 108 */
mbed_official 237:f3da66175598 109 if (SystemCoreClock == 64000000) {
mbed_official 237:f3da66175598 110 switch (hz) {
mbed_official 237:f3da66175598 111 case 100000:
mbed_official 272:949bd8bf133b 112 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 237:f3da66175598 113 break;
mbed_official 237:f3da66175598 114 case 400000:
mbed_official 272:949bd8bf133b 115 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 237:f3da66175598 116 break;
mbed_official 237:f3da66175598 117 case 1000000:
mbed_official 272:949bd8bf133b 118 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 237:f3da66175598 119 // Enable the Fast Mode Plus capability
mbed_official 237:f3da66175598 120 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
mbed_official 237:f3da66175598 121 break;
mbed_official 237:f3da66175598 122 default:
mbed_official 237:f3da66175598 123 break;
mbed_official 237:f3da66175598 124 }
mbed_official 237:f3da66175598 125 } else if (SystemCoreClock == 72000000) {
mbed_official 237:f3da66175598 126 switch (hz) {
mbed_official 237:f3da66175598 127 case 100000:
mbed_official 272:949bd8bf133b 128 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 237:f3da66175598 129 break;
mbed_official 237:f3da66175598 130 case 400000:
mbed_official 272:949bd8bf133b 131 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 237:f3da66175598 132 break;
mbed_official 237:f3da66175598 133 case 1000000:
mbed_official 272:949bd8bf133b 134 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 237:f3da66175598 135 // Enable the Fast Mode Plus capability
mbed_official 237:f3da66175598 136 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
mbed_official 237:f3da66175598 137 break;
mbed_official 237:f3da66175598 138 default:
mbed_official 237:f3da66175598 139 break;
mbed_official 237:f3da66175598 140 }
mbed_official 237:f3da66175598 141 }
mbed_official 237:f3da66175598 142
mbed_official 237:f3da66175598 143 // I2C configuration
mbed_official 237:f3da66175598 144 I2cHandle.Init.Timing = tim;
mbed_official 237:f3da66175598 145 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 237:f3da66175598 146 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 237:f3da66175598 147 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 237:f3da66175598 148 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 237:f3da66175598 149 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 237:f3da66175598 150 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 237:f3da66175598 151 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 237:f3da66175598 152 HAL_I2C_Init(&I2cHandle);
mbed_official 237:f3da66175598 153 }
mbed_official 237:f3da66175598 154
mbed_official 237:f3da66175598 155 inline int i2c_start(i2c_t *obj)
mbed_official 237:f3da66175598 156 {
mbed_official 237:f3da66175598 157 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 158 int timeout;
mbed_official 237:f3da66175598 159
mbed_official 237:f3da66175598 160 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 161
mbed_official 237:f3da66175598 162 // Clear Acknowledge failure flag
mbed_official 237:f3da66175598 163 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 237:f3da66175598 164
mbed_official 237:f3da66175598 165 // Generate the START condition
mbed_official 237:f3da66175598 166 i2c->CR2 |= I2C_CR2_START;
mbed_official 237:f3da66175598 167
mbed_official 237:f3da66175598 168 // Wait the START condition has been correctly sent
mbed_official 237:f3da66175598 169 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 170 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 237:f3da66175598 171 if ((timeout--) == 0) {
mbed_official 237:f3da66175598 172 return 1;
mbed_official 237:f3da66175598 173 }
mbed_official 237:f3da66175598 174 }
mbed_official 237:f3da66175598 175
mbed_official 237:f3da66175598 176 return 0;
mbed_official 237:f3da66175598 177 }
mbed_official 237:f3da66175598 178
mbed_official 237:f3da66175598 179 inline int i2c_stop(i2c_t *obj)
mbed_official 237:f3da66175598 180 {
mbed_official 237:f3da66175598 181 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 182
mbed_official 237:f3da66175598 183 // Generate the STOP condition
mbed_official 237:f3da66175598 184 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 237:f3da66175598 185
mbed_official 237:f3da66175598 186 return 0;
mbed_official 237:f3da66175598 187 }
mbed_official 237:f3da66175598 188
mbed_official 237:f3da66175598 189 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 237:f3da66175598 190 {
mbed_official 237:f3da66175598 191 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 192 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 193 int timeout;
mbed_official 237:f3da66175598 194 int count;
mbed_official 237:f3da66175598 195 int value;
mbed_official 237:f3da66175598 196
mbed_official 237:f3da66175598 197 /* update CR2 register */
mbed_official 237:f3da66175598 198 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 237:f3da66175598 199 | (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 237:f3da66175598 200
mbed_official 237:f3da66175598 201 // Read all bytes
mbed_official 237:f3da66175598 202 for (count = 0; count < length; count++) {
mbed_official 237:f3da66175598 203 value = i2c_byte_read(obj, 0);
mbed_official 237:f3da66175598 204 data[count] = (char)value;
mbed_official 237:f3da66175598 205 }
mbed_official 237:f3da66175598 206
mbed_official 237:f3da66175598 207 // Wait transfer complete
mbed_official 237:f3da66175598 208 timeout = LONG_TIMEOUT;
mbed_official 237:f3da66175598 209 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 237:f3da66175598 210 timeout--;
mbed_official 237:f3da66175598 211 if (timeout == 0) {
mbed_official 247:135e3186a638 212 return -1;
mbed_official 237:f3da66175598 213 }
mbed_official 237:f3da66175598 214 }
mbed_official 237:f3da66175598 215
mbed_official 237:f3da66175598 216 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 237:f3da66175598 217
mbed_official 237:f3da66175598 218 // If not repeated start, send stop.
mbed_official 237:f3da66175598 219 if (stop) {
mbed_official 237:f3da66175598 220 i2c_stop(obj);
mbed_official 237:f3da66175598 221 /* Wait until STOPF flag is set */
mbed_official 237:f3da66175598 222 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 223 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 237:f3da66175598 224 timeout--;
mbed_official 237:f3da66175598 225 if (timeout == 0) {
mbed_official 247:135e3186a638 226 return -1;
mbed_official 237:f3da66175598 227 }
mbed_official 237:f3da66175598 228 }
mbed_official 237:f3da66175598 229 /* Clear STOP Flag */
mbed_official 237:f3da66175598 230 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 237:f3da66175598 231 }
mbed_official 237:f3da66175598 232
mbed_official 237:f3da66175598 233 return length;
mbed_official 237:f3da66175598 234 }
mbed_official 237:f3da66175598 235
mbed_official 237:f3da66175598 236 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 237:f3da66175598 237 {
mbed_official 237:f3da66175598 238 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 239 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 240 int timeout;
mbed_official 237:f3da66175598 241 int count;
mbed_official 237:f3da66175598 242
mbed_official 237:f3da66175598 243 /* update CR2 register */
mbed_official 237:f3da66175598 244 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 237:f3da66175598 245 | (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 237:f3da66175598 246
mbed_official 237:f3da66175598 247 for (count = 0; count < length; count++) {
mbed_official 237:f3da66175598 248 i2c_byte_write(obj, data[count]);
mbed_official 237:f3da66175598 249 }
mbed_official 237:f3da66175598 250
mbed_official 237:f3da66175598 251 // Wait transfer complete
mbed_official 237:f3da66175598 252 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 253 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 237:f3da66175598 254 timeout--;
mbed_official 237:f3da66175598 255 if (timeout == 0) {
mbed_official 247:135e3186a638 256 return -1;
mbed_official 237:f3da66175598 257 }
mbed_official 237:f3da66175598 258 }
mbed_official 237:f3da66175598 259
mbed_official 237:f3da66175598 260 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 237:f3da66175598 261
mbed_official 237:f3da66175598 262 // If not repeated start, send stop.
mbed_official 237:f3da66175598 263 if (stop) {
mbed_official 237:f3da66175598 264 i2c_stop(obj);
mbed_official 237:f3da66175598 265 /* Wait until STOPF flag is set */
mbed_official 237:f3da66175598 266 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 267 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 237:f3da66175598 268 timeout--;
mbed_official 237:f3da66175598 269 if (timeout == 0) {
mbed_official 247:135e3186a638 270 return -1;
mbed_official 237:f3da66175598 271 }
mbed_official 237:f3da66175598 272 }
mbed_official 237:f3da66175598 273 /* Clear STOP Flag */
mbed_official 237:f3da66175598 274 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 237:f3da66175598 275 }
mbed_official 237:f3da66175598 276
mbed_official 237:f3da66175598 277 return count;
mbed_official 237:f3da66175598 278 }
mbed_official 237:f3da66175598 279
mbed_official 237:f3da66175598 280 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 237:f3da66175598 281 {
mbed_official 237:f3da66175598 282 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 283 int timeout;
mbed_official 237:f3da66175598 284
mbed_official 237:f3da66175598 285 // Wait until the byte is received
mbed_official 237:f3da66175598 286 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 287 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 237:f3da66175598 288 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 289 return -1;
mbed_official 237:f3da66175598 290 }
mbed_official 237:f3da66175598 291 }
mbed_official 237:f3da66175598 292
mbed_official 237:f3da66175598 293 return (int)i2c->RXDR;
mbed_official 237:f3da66175598 294 }
mbed_official 237:f3da66175598 295
mbed_official 237:f3da66175598 296 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 237:f3da66175598 297 {
mbed_official 237:f3da66175598 298 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 299 int timeout;
mbed_official 237:f3da66175598 300
mbed_official 237:f3da66175598 301 // Wait until the previous byte is transmitted
mbed_official 237:f3da66175598 302 timeout = FLAG_TIMEOUT;
mbed_official 237:f3da66175598 303 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 237:f3da66175598 304 if ((timeout--) == 0) {
mbed_official 237:f3da66175598 305 return 0;
mbed_official 237:f3da66175598 306 }
mbed_official 237:f3da66175598 307 }
mbed_official 237:f3da66175598 308
mbed_official 237:f3da66175598 309 i2c->TXDR = (uint8_t)data;
mbed_official 237:f3da66175598 310
mbed_official 237:f3da66175598 311 return 1;
mbed_official 237:f3da66175598 312 }
mbed_official 237:f3da66175598 313
mbed_official 237:f3da66175598 314 void i2c_reset(i2c_t *obj)
mbed_official 237:f3da66175598 315 {
mbed_official 237:f3da66175598 316 __I2C1_FORCE_RESET();
mbed_official 237:f3da66175598 317 __I2C1_RELEASE_RESET();
mbed_official 237:f3da66175598 318 }
mbed_official 237:f3da66175598 319
mbed_official 237:f3da66175598 320 #if DEVICE_I2CSLAVE
mbed_official 237:f3da66175598 321
mbed_official 237:f3da66175598 322 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 237:f3da66175598 323 {
mbed_official 237:f3da66175598 324 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 325 uint16_t tmpreg;
mbed_official 237:f3da66175598 326
mbed_official 237:f3da66175598 327 // disable
mbed_official 237:f3da66175598 328 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 237:f3da66175598 329 // Get the old register value
mbed_official 237:f3da66175598 330 tmpreg = i2c->OAR1;
mbed_official 237:f3da66175598 331 // Reset address bits
mbed_official 237:f3da66175598 332 tmpreg &= 0xFC00;
mbed_official 237:f3da66175598 333 // Set new address
mbed_official 237:f3da66175598 334 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 237:f3da66175598 335 // Store the new register value
mbed_official 237:f3da66175598 336 i2c->OAR1 = tmpreg;
mbed_official 237:f3da66175598 337 // enable
mbed_official 237:f3da66175598 338 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 237:f3da66175598 339 }
mbed_official 237:f3da66175598 340
mbed_official 237:f3da66175598 341 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 237:f3da66175598 342 {
mbed_official 237:f3da66175598 343
mbed_official 237:f3da66175598 344 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 345 uint16_t tmpreg;
mbed_official 237:f3da66175598 346
mbed_official 237:f3da66175598 347 // Get the old register value
mbed_official 237:f3da66175598 348 tmpreg = i2c->OAR1;
mbed_official 237:f3da66175598 349
mbed_official 237:f3da66175598 350 // Enable / disable slave
mbed_official 237:f3da66175598 351 if (enable_slave == 1) {
mbed_official 237:f3da66175598 352 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 237:f3da66175598 353 } else {
mbed_official 237:f3da66175598 354 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 237:f3da66175598 355 }
mbed_official 237:f3da66175598 356
mbed_official 237:f3da66175598 357 // Set new mode
mbed_official 237:f3da66175598 358 i2c->OAR1 = tmpreg;
mbed_official 237:f3da66175598 359
mbed_official 237:f3da66175598 360 }
mbed_official 237:f3da66175598 361
mbed_official 237:f3da66175598 362 // See I2CSlave.h
mbed_official 237:f3da66175598 363 #define NoData 0 // the slave has not been addressed
mbed_official 237:f3da66175598 364 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 237:f3da66175598 365 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 237:f3da66175598 366 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 237:f3da66175598 367
mbed_official 237:f3da66175598 368 int i2c_slave_receive(i2c_t *obj)
mbed_official 237:f3da66175598 369 {
mbed_official 237:f3da66175598 370 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 371 int retValue = NoData;
mbed_official 237:f3da66175598 372
mbed_official 237:f3da66175598 373 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 237:f3da66175598 374 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 237:f3da66175598 375 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 237:f3da66175598 376 retValue = ReadAddressed;
mbed_official 237:f3da66175598 377 else
mbed_official 237:f3da66175598 378 retValue = WriteAddressed;
mbed_official 237:f3da66175598 379 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 237:f3da66175598 380 }
mbed_official 237:f3da66175598 381 }
mbed_official 237:f3da66175598 382
mbed_official 237:f3da66175598 383 return (retValue);
mbed_official 237:f3da66175598 384 }
mbed_official 237:f3da66175598 385
mbed_official 237:f3da66175598 386 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 237:f3da66175598 387 {
mbed_official 237:f3da66175598 388 char size = 0;
mbed_official 237:f3da66175598 389
mbed_official 237:f3da66175598 390 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 237:f3da66175598 391
mbed_official 237:f3da66175598 392 return size;
mbed_official 237:f3da66175598 393 }
mbed_official 237:f3da66175598 394
mbed_official 237:f3da66175598 395 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 237:f3da66175598 396 {
mbed_official 237:f3da66175598 397 char size = 0;
mbed_official 237:f3da66175598 398 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 237:f3da66175598 399
mbed_official 237:f3da66175598 400 do {
mbed_official 237:f3da66175598 401 i2c_byte_write(obj, data[size]);
mbed_official 237:f3da66175598 402 size++;
mbed_official 237:f3da66175598 403 } while (size < length);
mbed_official 237:f3da66175598 404
mbed_official 237:f3da66175598 405 return size;
mbed_official 237:f3da66175598 406 }
mbed_official 237:f3da66175598 407
mbed_official 237:f3da66175598 408
mbed_official 237:f3da66175598 409 #endif // DEVICE_I2CSLAVE
mbed_official 237:f3da66175598 410
mbed_official 237:f3da66175598 411 #endif // DEVICE_I2C