Toyomasa Watarai / mbed-src

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F334C8/i2c_api.c@381:5460fc57b6e4, 2014-11-03 (annotated)

Committer:
mbed_official
Date:
Mon Nov 03 10:30:07 2014 +0000
Revision:
381:5460fc57b6e4
Synchronized with git revision 02478cd1f27fc7b9643486472635eb515b2bca81



Full URL: https://github.com/mbedmicro/mbed/commit/02478cd1f27fc7b9643486472635eb515b2bca81/



Target: LPC1549 - Fix serial interrupt issues (issue report #616)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 381:5460fc57b6e4 1 /* mbed Microcontroller Library
mbed_official 381:5460fc57b6e4 2 *******************************************************************************
mbed_official 381:5460fc57b6e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 381:5460fc57b6e4 4 * All rights reserved.
mbed_official 381:5460fc57b6e4 5 *
mbed_official 381:5460fc57b6e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 381:5460fc57b6e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 381:5460fc57b6e4 8 *
mbed_official 381:5460fc57b6e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 381:5460fc57b6e4 10 * this list of conditions and the following disclaimer.
mbed_official 381:5460fc57b6e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 381:5460fc57b6e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 381:5460fc57b6e4 13 * and/or other materials provided with the distribution.
mbed_official 381:5460fc57b6e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 381:5460fc57b6e4 15 * may be used to endorse or promote products derived from this software
mbed_official 381:5460fc57b6e4 16 * without specific prior written permission.
mbed_official 381:5460fc57b6e4 17 *
mbed_official 381:5460fc57b6e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 381:5460fc57b6e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 381:5460fc57b6e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 381:5460fc57b6e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 381:5460fc57b6e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 381:5460fc57b6e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 381:5460fc57b6e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 381:5460fc57b6e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 381:5460fc57b6e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 381:5460fc57b6e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 381:5460fc57b6e4 28 *******************************************************************************
mbed_official 381:5460fc57b6e4 29 */
mbed_official 381:5460fc57b6e4 30 #include "mbed_assert.h"
mbed_official 381:5460fc57b6e4 31 #include "i2c_api.h"
mbed_official 381:5460fc57b6e4 32
mbed_official 381:5460fc57b6e4 33 #if DEVICE_I2C
mbed_official 381:5460fc57b6e4 34
mbed_official 381:5460fc57b6e4 35 #include "cmsis.h"
mbed_official 381:5460fc57b6e4 36 #include "pinmap.h"
mbed_official 381:5460fc57b6e4 37
mbed_official 381:5460fc57b6e4 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 381:5460fc57b6e4 39 not based on accurate values, they just guarantee that the application will
mbed_official 381:5460fc57b6e4 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 381:5460fc57b6e4 41 #define FLAG_TIMEOUT ((int)0x4000)
mbed_official 381:5460fc57b6e4 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 381:5460fc57b6e4 43
mbed_official 381:5460fc57b6e4 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 381:5460fc57b6e4 45 {PA_14, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 48 {NC, NC, 0}
mbed_official 381:5460fc57b6e4 49 };
mbed_official 381:5460fc57b6e4 50
mbed_official 381:5460fc57b6e4 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 381:5460fc57b6e4 52 {PA_15, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 381:5460fc57b6e4 55 {NC, NC, 0}
mbed_official 381:5460fc57b6e4 56 };
mbed_official 381:5460fc57b6e4 57
mbed_official 381:5460fc57b6e4 58 I2C_HandleTypeDef I2cHandle;
mbed_official 381:5460fc57b6e4 59
mbed_official 381:5460fc57b6e4 60 int i2c1_inited = 0;
mbed_official 381:5460fc57b6e4 61
mbed_official 381:5460fc57b6e4 62 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 381:5460fc57b6e4 63 // Determine the I2C to use
mbed_official 381:5460fc57b6e4 64 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 381:5460fc57b6e4 65 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 381:5460fc57b6e4 66
mbed_official 381:5460fc57b6e4 67 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 381:5460fc57b6e4 68 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 381:5460fc57b6e4 69
mbed_official 381:5460fc57b6e4 70 // Enable I2C1 clock and pinout if not done
mbed_official 381:5460fc57b6e4 71 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 381:5460fc57b6e4 72 i2c1_inited = 1;
mbed_official 381:5460fc57b6e4 73 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 381:5460fc57b6e4 74 __I2C1_CLK_ENABLE();
mbed_official 381:5460fc57b6e4 75 // Configure I2C pins
mbed_official 381:5460fc57b6e4 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 381:5460fc57b6e4 77 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 381:5460fc57b6e4 78 pin_mode(sda, OpenDrain);
mbed_official 381:5460fc57b6e4 79 pin_mode(scl, OpenDrain);
mbed_official 381:5460fc57b6e4 80 }
mbed_official 381:5460fc57b6e4 81
mbed_official 381:5460fc57b6e4 82 // Reset to clear pending flags if any
mbed_official 381:5460fc57b6e4 83 i2c_reset(obj);
mbed_official 381:5460fc57b6e4 84
mbed_official 381:5460fc57b6e4 85 // I2C configuration
mbed_official 381:5460fc57b6e4 86 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 381:5460fc57b6e4 87 }
mbed_official 381:5460fc57b6e4 88
mbed_official 381:5460fc57b6e4 89 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 381:5460fc57b6e4 90 {
mbed_official 381:5460fc57b6e4 91 uint32_t tim = 0;
mbed_official 381:5460fc57b6e4 92
mbed_official 381:5460fc57b6e4 93 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 381:5460fc57b6e4 94
mbed_official 381:5460fc57b6e4 95 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 96 int timeout;
mbed_official 381:5460fc57b6e4 97
mbed_official 381:5460fc57b6e4 98 // wait before init
mbed_official 381:5460fc57b6e4 99 timeout = LONG_TIMEOUT;
mbed_official 381:5460fc57b6e4 100 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 381:5460fc57b6e4 101
mbed_official 381:5460fc57b6e4 102 // Update the SystemCoreClock variable.
mbed_official 381:5460fc57b6e4 103 SystemCoreClockUpdate();
mbed_official 381:5460fc57b6e4 104
mbed_official 381:5460fc57b6e4 105 /*
mbed_official 381:5460fc57b6e4 106 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 381:5460fc57b6e4 107 * Standard mode (up to 100 kHz)
mbed_official 381:5460fc57b6e4 108 * Fast Mode (up to 400 kHz)
mbed_official 381:5460fc57b6e4 109 * Fast Mode Plus (up to 1 MHz)
mbed_official 381:5460fc57b6e4 110 Below values obtained with:
mbed_official 381:5460fc57b6e4 111 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 381:5460fc57b6e4 112 - Analog filter delay = ON
mbed_official 381:5460fc57b6e4 113 - Digital filter coefficient = 0
mbed_official 381:5460fc57b6e4 114 */
mbed_official 381:5460fc57b6e4 115 if (SystemCoreClock == 64000000) {
mbed_official 381:5460fc57b6e4 116 switch (hz) {
mbed_official 381:5460fc57b6e4 117 case 100000:
mbed_official 381:5460fc57b6e4 118 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 381:5460fc57b6e4 119 break;
mbed_official 381:5460fc57b6e4 120 case 400000:
mbed_official 381:5460fc57b6e4 121 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 381:5460fc57b6e4 122 break;
mbed_official 381:5460fc57b6e4 123 case 1000000:
mbed_official 381:5460fc57b6e4 124 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 381:5460fc57b6e4 125 // Enable the Fast Mode Plus capability
mbed_official 381:5460fc57b6e4 126 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
mbed_official 381:5460fc57b6e4 127 break;
mbed_official 381:5460fc57b6e4 128 default:
mbed_official 381:5460fc57b6e4 129 break;
mbed_official 381:5460fc57b6e4 130 }
mbed_official 381:5460fc57b6e4 131 } else if (SystemCoreClock == 72000000) {
mbed_official 381:5460fc57b6e4 132 switch (hz) {
mbed_official 381:5460fc57b6e4 133 case 100000:
mbed_official 381:5460fc57b6e4 134 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 381:5460fc57b6e4 135 break;
mbed_official 381:5460fc57b6e4 136 case 400000:
mbed_official 381:5460fc57b6e4 137 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 381:5460fc57b6e4 138 break;
mbed_official 381:5460fc57b6e4 139 case 1000000:
mbed_official 381:5460fc57b6e4 140 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 381:5460fc57b6e4 141 // Enable the Fast Mode Plus capability
mbed_official 381:5460fc57b6e4 142 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
mbed_official 381:5460fc57b6e4 143 break;
mbed_official 381:5460fc57b6e4 144 default:
mbed_official 381:5460fc57b6e4 145 break;
mbed_official 381:5460fc57b6e4 146 }
mbed_official 381:5460fc57b6e4 147 }
mbed_official 381:5460fc57b6e4 148
mbed_official 381:5460fc57b6e4 149 // I2C configuration
mbed_official 381:5460fc57b6e4 150 I2cHandle.Init.Timing = tim;
mbed_official 381:5460fc57b6e4 151 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 381:5460fc57b6e4 152 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 381:5460fc57b6e4 153 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 381:5460fc57b6e4 154 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 381:5460fc57b6e4 155 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 381:5460fc57b6e4 156 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 381:5460fc57b6e4 157 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 381:5460fc57b6e4 158 HAL_I2C_Init(&I2cHandle);
mbed_official 381:5460fc57b6e4 159 }
mbed_official 381:5460fc57b6e4 160
mbed_official 381:5460fc57b6e4 161 inline int i2c_start(i2c_t *obj)
mbed_official 381:5460fc57b6e4 162 {
mbed_official 381:5460fc57b6e4 163 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 164 int timeout;
mbed_official 381:5460fc57b6e4 165
mbed_official 381:5460fc57b6e4 166 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 167
mbed_official 381:5460fc57b6e4 168 // Clear Acknowledge failure flag
mbed_official 381:5460fc57b6e4 169 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 381:5460fc57b6e4 170
mbed_official 381:5460fc57b6e4 171 // Generate the START condition
mbed_official 381:5460fc57b6e4 172 i2c->CR2 |= I2C_CR2_START;
mbed_official 381:5460fc57b6e4 173
mbed_official 381:5460fc57b6e4 174 // Wait the START condition has been correctly sent
mbed_official 381:5460fc57b6e4 175 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 176 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 381:5460fc57b6e4 177 if ((timeout--) == 0) {
mbed_official 381:5460fc57b6e4 178 return 1;
mbed_official 381:5460fc57b6e4 179 }
mbed_official 381:5460fc57b6e4 180 }
mbed_official 381:5460fc57b6e4 181
mbed_official 381:5460fc57b6e4 182 return 0;
mbed_official 381:5460fc57b6e4 183 }
mbed_official 381:5460fc57b6e4 184
mbed_official 381:5460fc57b6e4 185 inline int i2c_stop(i2c_t *obj)
mbed_official 381:5460fc57b6e4 186 {
mbed_official 381:5460fc57b6e4 187 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 188
mbed_official 381:5460fc57b6e4 189 // Generate the STOP condition
mbed_official 381:5460fc57b6e4 190 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 381:5460fc57b6e4 191
mbed_official 381:5460fc57b6e4 192 return 0;
mbed_official 381:5460fc57b6e4 193 }
mbed_official 381:5460fc57b6e4 194
mbed_official 381:5460fc57b6e4 195 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 381:5460fc57b6e4 196 {
mbed_official 381:5460fc57b6e4 197 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 198 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 199 int timeout;
mbed_official 381:5460fc57b6e4 200 int count;
mbed_official 381:5460fc57b6e4 201 int value;
mbed_official 381:5460fc57b6e4 202
mbed_official 381:5460fc57b6e4 203 /* update CR2 register */
mbed_official 381:5460fc57b6e4 204 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 381:5460fc57b6e4 205 | (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 381:5460fc57b6e4 206
mbed_official 381:5460fc57b6e4 207 // Read all bytes
mbed_official 381:5460fc57b6e4 208 for (count = 0; count < length; count++) {
mbed_official 381:5460fc57b6e4 209 value = i2c_byte_read(obj, 0);
mbed_official 381:5460fc57b6e4 210 data[count] = (char)value;
mbed_official 381:5460fc57b6e4 211 }
mbed_official 381:5460fc57b6e4 212
mbed_official 381:5460fc57b6e4 213 // Wait transfer complete
mbed_official 381:5460fc57b6e4 214 timeout = LONG_TIMEOUT;
mbed_official 381:5460fc57b6e4 215 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 381:5460fc57b6e4 216 timeout--;
mbed_official 381:5460fc57b6e4 217 if (timeout == 0) {
mbed_official 381:5460fc57b6e4 218 return -1;
mbed_official 381:5460fc57b6e4 219 }
mbed_official 381:5460fc57b6e4 220 }
mbed_official 381:5460fc57b6e4 221
mbed_official 381:5460fc57b6e4 222 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 381:5460fc57b6e4 223
mbed_official 381:5460fc57b6e4 224 // If not repeated start, send stop.
mbed_official 381:5460fc57b6e4 225 if (stop) {
mbed_official 381:5460fc57b6e4 226 i2c_stop(obj);
mbed_official 381:5460fc57b6e4 227 /* Wait until STOPF flag is set */
mbed_official 381:5460fc57b6e4 228 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 229 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 381:5460fc57b6e4 230 timeout--;
mbed_official 381:5460fc57b6e4 231 if (timeout == 0) {
mbed_official 381:5460fc57b6e4 232 return -1;
mbed_official 381:5460fc57b6e4 233 }
mbed_official 381:5460fc57b6e4 234 }
mbed_official 381:5460fc57b6e4 235 /* Clear STOP Flag */
mbed_official 381:5460fc57b6e4 236 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 381:5460fc57b6e4 237 }
mbed_official 381:5460fc57b6e4 238
mbed_official 381:5460fc57b6e4 239 return length;
mbed_official 381:5460fc57b6e4 240 }
mbed_official 381:5460fc57b6e4 241
mbed_official 381:5460fc57b6e4 242 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 381:5460fc57b6e4 243 {
mbed_official 381:5460fc57b6e4 244 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 245 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 246 int timeout;
mbed_official 381:5460fc57b6e4 247 int count;
mbed_official 381:5460fc57b6e4 248
mbed_official 381:5460fc57b6e4 249 /* update CR2 register */
mbed_official 381:5460fc57b6e4 250 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 381:5460fc57b6e4 251 | (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 381:5460fc57b6e4 252
mbed_official 381:5460fc57b6e4 253 for (count = 0; count < length; count++) {
mbed_official 381:5460fc57b6e4 254 i2c_byte_write(obj, data[count]);
mbed_official 381:5460fc57b6e4 255 }
mbed_official 381:5460fc57b6e4 256
mbed_official 381:5460fc57b6e4 257 // Wait transfer complete
mbed_official 381:5460fc57b6e4 258 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 259 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 381:5460fc57b6e4 260 timeout--;
mbed_official 381:5460fc57b6e4 261 if (timeout == 0) {
mbed_official 381:5460fc57b6e4 262 return -1;
mbed_official 381:5460fc57b6e4 263 }
mbed_official 381:5460fc57b6e4 264 }
mbed_official 381:5460fc57b6e4 265
mbed_official 381:5460fc57b6e4 266 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 381:5460fc57b6e4 267
mbed_official 381:5460fc57b6e4 268 // If not repeated start, send stop.
mbed_official 381:5460fc57b6e4 269 if (stop) {
mbed_official 381:5460fc57b6e4 270 i2c_stop(obj);
mbed_official 381:5460fc57b6e4 271 /* Wait until STOPF flag is set */
mbed_official 381:5460fc57b6e4 272 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 273 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 381:5460fc57b6e4 274 timeout--;
mbed_official 381:5460fc57b6e4 275 if (timeout == 0) {
mbed_official 381:5460fc57b6e4 276 return -1;
mbed_official 381:5460fc57b6e4 277 }
mbed_official 381:5460fc57b6e4 278 }
mbed_official 381:5460fc57b6e4 279 /* Clear STOP Flag */
mbed_official 381:5460fc57b6e4 280 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 381:5460fc57b6e4 281 }
mbed_official 381:5460fc57b6e4 282
mbed_official 381:5460fc57b6e4 283 return count;
mbed_official 381:5460fc57b6e4 284 }
mbed_official 381:5460fc57b6e4 285
mbed_official 381:5460fc57b6e4 286 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 381:5460fc57b6e4 287 {
mbed_official 381:5460fc57b6e4 288 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 289 int timeout;
mbed_official 381:5460fc57b6e4 290
mbed_official 381:5460fc57b6e4 291 // Wait until the byte is received
mbed_official 381:5460fc57b6e4 292 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 293 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 381:5460fc57b6e4 294 if ((timeout--) == 0) {
mbed_official 381:5460fc57b6e4 295 return -1;
mbed_official 381:5460fc57b6e4 296 }
mbed_official 381:5460fc57b6e4 297 }
mbed_official 381:5460fc57b6e4 298
mbed_official 381:5460fc57b6e4 299 return (int)i2c->RXDR;
mbed_official 381:5460fc57b6e4 300 }
mbed_official 381:5460fc57b6e4 301
mbed_official 381:5460fc57b6e4 302 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 381:5460fc57b6e4 303 {
mbed_official 381:5460fc57b6e4 304 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 305 int timeout;
mbed_official 381:5460fc57b6e4 306
mbed_official 381:5460fc57b6e4 307 // Wait until the previous byte is transmitted
mbed_official 381:5460fc57b6e4 308 timeout = FLAG_TIMEOUT;
mbed_official 381:5460fc57b6e4 309 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 381:5460fc57b6e4 310 if ((timeout--) == 0) {
mbed_official 381:5460fc57b6e4 311 return 0;
mbed_official 381:5460fc57b6e4 312 }
mbed_official 381:5460fc57b6e4 313 }
mbed_official 381:5460fc57b6e4 314
mbed_official 381:5460fc57b6e4 315 i2c->TXDR = (uint8_t)data;
mbed_official 381:5460fc57b6e4 316
mbed_official 381:5460fc57b6e4 317 return 1;
mbed_official 381:5460fc57b6e4 318 }
mbed_official 381:5460fc57b6e4 319
mbed_official 381:5460fc57b6e4 320 void i2c_reset(i2c_t *obj)
mbed_official 381:5460fc57b6e4 321 {
mbed_official 381:5460fc57b6e4 322 int timeout;
mbed_official 381:5460fc57b6e4 323
mbed_official 381:5460fc57b6e4 324 // wait before reset
mbed_official 381:5460fc57b6e4 325 timeout = LONG_TIMEOUT;
mbed_official 381:5460fc57b6e4 326 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 381:5460fc57b6e4 327
mbed_official 381:5460fc57b6e4 328 __I2C1_FORCE_RESET();
mbed_official 381:5460fc57b6e4 329 __I2C1_RELEASE_RESET();
mbed_official 381:5460fc57b6e4 330 }
mbed_official 381:5460fc57b6e4 331
mbed_official 381:5460fc57b6e4 332 #if DEVICE_I2CSLAVE
mbed_official 381:5460fc57b6e4 333
mbed_official 381:5460fc57b6e4 334 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 381:5460fc57b6e4 335 {
mbed_official 381:5460fc57b6e4 336 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 337 uint16_t tmpreg;
mbed_official 381:5460fc57b6e4 338
mbed_official 381:5460fc57b6e4 339 // disable
mbed_official 381:5460fc57b6e4 340 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 381:5460fc57b6e4 341 // Get the old register value
mbed_official 381:5460fc57b6e4 342 tmpreg = i2c->OAR1;
mbed_official 381:5460fc57b6e4 343 // Reset address bits
mbed_official 381:5460fc57b6e4 344 tmpreg &= 0xFC00;
mbed_official 381:5460fc57b6e4 345 // Set new address
mbed_official 381:5460fc57b6e4 346 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 381:5460fc57b6e4 347 // Store the new register value
mbed_official 381:5460fc57b6e4 348 i2c->OAR1 = tmpreg;
mbed_official 381:5460fc57b6e4 349 // enable
mbed_official 381:5460fc57b6e4 350 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 381:5460fc57b6e4 351 }
mbed_official 381:5460fc57b6e4 352
mbed_official 381:5460fc57b6e4 353 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 381:5460fc57b6e4 354 {
mbed_official 381:5460fc57b6e4 355
mbed_official 381:5460fc57b6e4 356 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 357 uint16_t tmpreg;
mbed_official 381:5460fc57b6e4 358
mbed_official 381:5460fc57b6e4 359 // Get the old register value
mbed_official 381:5460fc57b6e4 360 tmpreg = i2c->OAR1;
mbed_official 381:5460fc57b6e4 361
mbed_official 381:5460fc57b6e4 362 // Enable / disable slave
mbed_official 381:5460fc57b6e4 363 if (enable_slave == 1) {
mbed_official 381:5460fc57b6e4 364 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 381:5460fc57b6e4 365 } else {
mbed_official 381:5460fc57b6e4 366 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 381:5460fc57b6e4 367 }
mbed_official 381:5460fc57b6e4 368
mbed_official 381:5460fc57b6e4 369 // Set new mode
mbed_official 381:5460fc57b6e4 370 i2c->OAR1 = tmpreg;
mbed_official 381:5460fc57b6e4 371
mbed_official 381:5460fc57b6e4 372 }
mbed_official 381:5460fc57b6e4 373
mbed_official 381:5460fc57b6e4 374 // See I2CSlave.h
mbed_official 381:5460fc57b6e4 375 #define NoData 0 // the slave has not been addressed
mbed_official 381:5460fc57b6e4 376 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 381:5460fc57b6e4 377 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 381:5460fc57b6e4 378 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 381:5460fc57b6e4 379
mbed_official 381:5460fc57b6e4 380 int i2c_slave_receive(i2c_t *obj)
mbed_official 381:5460fc57b6e4 381 {
mbed_official 381:5460fc57b6e4 382 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 383 int retValue = NoData;
mbed_official 381:5460fc57b6e4 384
mbed_official 381:5460fc57b6e4 385 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 381:5460fc57b6e4 386 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 381:5460fc57b6e4 387 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 381:5460fc57b6e4 388 retValue = ReadAddressed;
mbed_official 381:5460fc57b6e4 389 else
mbed_official 381:5460fc57b6e4 390 retValue = WriteAddressed;
mbed_official 381:5460fc57b6e4 391 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 381:5460fc57b6e4 392 }
mbed_official 381:5460fc57b6e4 393 }
mbed_official 381:5460fc57b6e4 394
mbed_official 381:5460fc57b6e4 395 return (retValue);
mbed_official 381:5460fc57b6e4 396 }
mbed_official 381:5460fc57b6e4 397
mbed_official 381:5460fc57b6e4 398 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 381:5460fc57b6e4 399 {
mbed_official 381:5460fc57b6e4 400 char size = 0;
mbed_official 381:5460fc57b6e4 401
mbed_official 381:5460fc57b6e4 402 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 381:5460fc57b6e4 403
mbed_official 381:5460fc57b6e4 404 return size;
mbed_official 381:5460fc57b6e4 405 }
mbed_official 381:5460fc57b6e4 406
mbed_official 381:5460fc57b6e4 407 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 381:5460fc57b6e4 408 {
mbed_official 381:5460fc57b6e4 409 char size = 0;
mbed_official 381:5460fc57b6e4 410 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 381:5460fc57b6e4 411
mbed_official 381:5460fc57b6e4 412 do {
mbed_official 381:5460fc57b6e4 413 i2c_byte_write(obj, data[size]);
mbed_official 381:5460fc57b6e4 414 size++;
mbed_official 381:5460fc57b6e4 415 } while (size < length);
mbed_official 381:5460fc57b6e4 416
mbed_official 381:5460fc57b6e4 417 return size;
mbed_official 381:5460fc57b6e4 418 }
mbed_official 381:5460fc57b6e4 419
mbed_official 381:5460fc57b6e4 420
mbed_official 381:5460fc57b6e4 421 #endif // DEVICE_I2CSLAVE
mbed_official 381:5460fc57b6e4 422
mbed_official 381:5460fc57b6e4 423 #endif // DEVICE_I2C