Zakaria ElQotbi / mbed-src

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targets/hal/TARGET_STM/TARGET_STM32F3/i2c_api.c@625:88d3fa07e462, 2015-11-24 (annotated)

Committer:
zskdan
Date:
Tue Nov 24 14:02:46 2015 +0000
Revision:
625:88d3fa07e462
Parent:
508:4f5903e025e6 
remove unused service

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 508:4f5903e025e6 1 /* mbed Microcontroller Library
mbed_official 508:4f5903e025e6 2 *******************************************************************************
mbed_official 508:4f5903e025e6 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 508:4f5903e025e6 4 * All rights reserved.
mbed_official 508:4f5903e025e6 5 *
mbed_official 508:4f5903e025e6 6 * Redistribution and use in source and binary forms, with or without
mbed_official 508:4f5903e025e6 7 * modification, are permitted provided that the following conditions are met:
mbed_official 508:4f5903e025e6 8 *
mbed_official 508:4f5903e025e6 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 508:4f5903e025e6 10 * this list of conditions and the following disclaimer.
mbed_official 508:4f5903e025e6 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 508:4f5903e025e6 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 508:4f5903e025e6 13 * and/or other materials provided with the distribution.
mbed_official 508:4f5903e025e6 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 508:4f5903e025e6 15 * may be used to endorse or promote products derived from this software
mbed_official 508:4f5903e025e6 16 * without specific prior written permission.
mbed_official 508:4f5903e025e6 17 *
mbed_official 508:4f5903e025e6 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 508:4f5903e025e6 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 508:4f5903e025e6 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 508:4f5903e025e6 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 508:4f5903e025e6 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 508:4f5903e025e6 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 508:4f5903e025e6 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 508:4f5903e025e6 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 508:4f5903e025e6 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 508:4f5903e025e6 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 508:4f5903e025e6 28 *******************************************************************************
mbed_official 508:4f5903e025e6 29 */
mbed_official 508:4f5903e025e6 30 #include "mbed_assert.h"
mbed_official 508:4f5903e025e6 31 #include "i2c_api.h"
mbed_official 508:4f5903e025e6 32
mbed_official 508:4f5903e025e6 33 #if DEVICE_I2C
mbed_official 508:4f5903e025e6 34
mbed_official 508:4f5903e025e6 35 #include "cmsis.h"
mbed_official 508:4f5903e025e6 36 #include "pinmap.h"
mbed_official 508:4f5903e025e6 37 #include "PeripheralPins.h"
mbed_official 508:4f5903e025e6 38
mbed_official 508:4f5903e025e6 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 508:4f5903e025e6 40 not based on accurate values, they just guarantee that the application will
mbed_official 508:4f5903e025e6 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 508:4f5903e025e6 42 #define FLAG_TIMEOUT ((int)0x4000)
mbed_official 508:4f5903e025e6 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 508:4f5903e025e6 44
mbed_official 508:4f5903e025e6 45 I2C_HandleTypeDef I2cHandle;
mbed_official 508:4f5903e025e6 46
mbed_official 508:4f5903e025e6 47 int i2c1_inited = 0;
mbed_official 508:4f5903e025e6 48 int i2c2_inited = 0;
mbed_official 508:4f5903e025e6 49 int i2c3_inited = 0;
mbed_official 508:4f5903e025e6 50
mbed_official 508:4f5903e025e6 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 508:4f5903e025e6 52 {
mbed_official 508:4f5903e025e6 53 // Determine the I2C to use
mbed_official 508:4f5903e025e6 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 508:4f5903e025e6 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 508:4f5903e025e6 56
mbed_official 508:4f5903e025e6 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 508:4f5903e025e6 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 508:4f5903e025e6 59
mbed_official 508:4f5903e025e6 60 // Enable I2C clock and pinout if not done
mbed_official 508:4f5903e025e6 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 508:4f5903e025e6 62 i2c1_inited = 1;
mbed_official 508:4f5903e025e6 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 508:4f5903e025e6 64 __I2C1_CLK_ENABLE();
mbed_official 508:4f5903e025e6 65 // Configure I2C1 pins
mbed_official 508:4f5903e025e6 66 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 508:4f5903e025e6 67 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 508:4f5903e025e6 68 pin_mode(sda, OpenDrain);
mbed_official 508:4f5903e025e6 69 pin_mode(scl, OpenDrain);
mbed_official 508:4f5903e025e6 70 }
mbed_official 508:4f5903e025e6 71
mbed_official 508:4f5903e025e6 72 #if defined(I2C2_BASE)
mbed_official 508:4f5903e025e6 73 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 508:4f5903e025e6 74 i2c2_inited = 1;
mbed_official 508:4f5903e025e6 75 __I2C2_CLK_ENABLE();
mbed_official 508:4f5903e025e6 76 // Configure I2C2 pins
mbed_official 508:4f5903e025e6 77 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 508:4f5903e025e6 78 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 508:4f5903e025e6 79 pin_mode(sda, OpenDrain);
mbed_official 508:4f5903e025e6 80 pin_mode(scl, OpenDrain);
mbed_official 508:4f5903e025e6 81 }
mbed_official 508:4f5903e025e6 82 #endif
mbed_official 508:4f5903e025e6 83
mbed_official 508:4f5903e025e6 84 #if defined(I2C3_BASE)
mbed_official 508:4f5903e025e6 85 if ((obj->i2c == I2C_3) && !i2c3_inited) {
mbed_official 508:4f5903e025e6 86 i2c3_inited = 1;
mbed_official 508:4f5903e025e6 87 __I2C3_CLK_ENABLE();
mbed_official 508:4f5903e025e6 88 // Configure I2C3 pins
mbed_official 508:4f5903e025e6 89 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 508:4f5903e025e6 90 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 508:4f5903e025e6 91 pin_mode(sda, OpenDrain);
mbed_official 508:4f5903e025e6 92 pin_mode(scl, OpenDrain);
mbed_official 508:4f5903e025e6 93 }
mbed_official 508:4f5903e025e6 94 #endif
mbed_official 508:4f5903e025e6 95
mbed_official 508:4f5903e025e6 96 // Reset to clear pending flags if any
mbed_official 508:4f5903e025e6 97 i2c_reset(obj);
mbed_official 508:4f5903e025e6 98
mbed_official 508:4f5903e025e6 99 // I2C configuration
mbed_official 508:4f5903e025e6 100 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 508:4f5903e025e6 101 }
mbed_official 508:4f5903e025e6 102
mbed_official 508:4f5903e025e6 103 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 508:4f5903e025e6 104 {
mbed_official 508:4f5903e025e6 105 uint32_t tim = 0;
mbed_official 508:4f5903e025e6 106
mbed_official 508:4f5903e025e6 107 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 508:4f5903e025e6 108
mbed_official 508:4f5903e025e6 109 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 110 int timeout;
mbed_official 508:4f5903e025e6 111
mbed_official 508:4f5903e025e6 112 // wait before init
mbed_official 508:4f5903e025e6 113 timeout = LONG_TIMEOUT;
mbed_official 508:4f5903e025e6 114 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 508:4f5903e025e6 115
mbed_official 508:4f5903e025e6 116 // Update the SystemCoreClock variable.
mbed_official 508:4f5903e025e6 117 SystemCoreClockUpdate();
mbed_official 508:4f5903e025e6 118
mbed_official 508:4f5903e025e6 119 /*
mbed_official 508:4f5903e025e6 120 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 508:4f5903e025e6 121 * Standard mode (up to 100 kHz)
mbed_official 508:4f5903e025e6 122 * Fast Mode (up to 400 kHz)
mbed_official 508:4f5903e025e6 123 * Fast Mode Plus (up to 1 MHz)
mbed_official 508:4f5903e025e6 124 Below values obtained with:
mbed_official 508:4f5903e025e6 125 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 508:4f5903e025e6 126 - Analog filter delay = ON
mbed_official 508:4f5903e025e6 127 - Digital filter coefficient = 0
mbed_official 508:4f5903e025e6 128 */
mbed_official 508:4f5903e025e6 129 if (SystemCoreClock == 64000000) {
mbed_official 508:4f5903e025e6 130 switch (hz) {
mbed_official 508:4f5903e025e6 131 case 100000:
mbed_official 508:4f5903e025e6 132 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 508:4f5903e025e6 133 break;
mbed_official 508:4f5903e025e6 134 case 400000:
mbed_official 508:4f5903e025e6 135 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 508:4f5903e025e6 136 break;
mbed_official 508:4f5903e025e6 137 case 1000000:
mbed_official 508:4f5903e025e6 138 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 508:4f5903e025e6 139 break;
mbed_official 508:4f5903e025e6 140 default:
mbed_official 508:4f5903e025e6 141 break;
mbed_official 508:4f5903e025e6 142 }
mbed_official 508:4f5903e025e6 143 } else if (SystemCoreClock == 72000000) {
mbed_official 508:4f5903e025e6 144 switch (hz) {
mbed_official 508:4f5903e025e6 145 case 100000:
mbed_official 508:4f5903e025e6 146 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
mbed_official 508:4f5903e025e6 147 break;
mbed_official 508:4f5903e025e6 148 case 400000:
mbed_official 508:4f5903e025e6 149 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
mbed_official 508:4f5903e025e6 150 break;
mbed_official 508:4f5903e025e6 151 case 1000000:
mbed_official 508:4f5903e025e6 152 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
mbed_official 508:4f5903e025e6 153 break;
mbed_official 508:4f5903e025e6 154 default:
mbed_official 508:4f5903e025e6 155 break;
mbed_official 508:4f5903e025e6 156 }
mbed_official 508:4f5903e025e6 157 }
mbed_official 508:4f5903e025e6 158
mbed_official 508:4f5903e025e6 159 // Enable the Fast Mode Plus capability
mbed_official 508:4f5903e025e6 160 if (hz == 1000000) {
mbed_official 508:4f5903e025e6 161 if (obj->i2c == I2C_1) {
mbed_official 508:4f5903e025e6 162 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
mbed_official 508:4f5903e025e6 163 }
mbed_official 508:4f5903e025e6 164 #if defined(I2C2_BASE)
mbed_official 508:4f5903e025e6 165 if (obj->i2c == I2C_2) {
mbed_official 508:4f5903e025e6 166 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C2);
mbed_official 508:4f5903e025e6 167 }
mbed_official 508:4f5903e025e6 168 #endif
mbed_official 508:4f5903e025e6 169 #if defined(I2C3_BASE)
mbed_official 508:4f5903e025e6 170 if (obj->i2c == I2C_3) {
mbed_official 508:4f5903e025e6 171 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C3);
mbed_official 508:4f5903e025e6 172 }
mbed_official 508:4f5903e025e6 173 #endif
mbed_official 508:4f5903e025e6 174 }
mbed_official 508:4f5903e025e6 175
mbed_official 508:4f5903e025e6 176 // I2C configuration
mbed_official 508:4f5903e025e6 177 I2cHandle.Init.Timing = tim;
mbed_official 508:4f5903e025e6 178 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 508:4f5903e025e6 179 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 508:4f5903e025e6 180 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 508:4f5903e025e6 181 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 508:4f5903e025e6 182 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 508:4f5903e025e6 183 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 508:4f5903e025e6 184 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 508:4f5903e025e6 185 HAL_I2C_Init(&I2cHandle);
mbed_official 508:4f5903e025e6 186 }
mbed_official 508:4f5903e025e6 187
mbed_official 508:4f5903e025e6 188 inline int i2c_start(i2c_t *obj)
mbed_official 508:4f5903e025e6 189 {
mbed_official 508:4f5903e025e6 190 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 191 int timeout;
mbed_official 508:4f5903e025e6 192
mbed_official 508:4f5903e025e6 193 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 194
mbed_official 508:4f5903e025e6 195 // Clear Acknowledge failure flag
mbed_official 508:4f5903e025e6 196 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 508:4f5903e025e6 197
mbed_official 508:4f5903e025e6 198 // Generate the START condition
mbed_official 508:4f5903e025e6 199 i2c->CR2 |= I2C_CR2_START;
mbed_official 508:4f5903e025e6 200
mbed_official 508:4f5903e025e6 201 // Wait the START condition has been correctly sent
mbed_official 508:4f5903e025e6 202 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 203 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 508:4f5903e025e6 204 if ((timeout--) == 0) {
mbed_official 508:4f5903e025e6 205 return 1;
mbed_official 508:4f5903e025e6 206 }
mbed_official 508:4f5903e025e6 207 }
mbed_official 508:4f5903e025e6 208
mbed_official 508:4f5903e025e6 209 return 0;
mbed_official 508:4f5903e025e6 210 }
mbed_official 508:4f5903e025e6 211
mbed_official 508:4f5903e025e6 212 inline int i2c_stop(i2c_t *obj)
mbed_official 508:4f5903e025e6 213 {
mbed_official 508:4f5903e025e6 214 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 215
mbed_official 508:4f5903e025e6 216 // Generate the STOP condition
mbed_official 508:4f5903e025e6 217 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 508:4f5903e025e6 218
mbed_official 508:4f5903e025e6 219 return 0;
mbed_official 508:4f5903e025e6 220 }
mbed_official 508:4f5903e025e6 221
mbed_official 508:4f5903e025e6 222 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 508:4f5903e025e6 223 {
mbed_official 508:4f5903e025e6 224 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 225 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 226 int timeout;
mbed_official 508:4f5903e025e6 227 int count;
mbed_official 508:4f5903e025e6 228 int value;
mbed_official 508:4f5903e025e6 229
mbed_official 508:4f5903e025e6 230 /* update CR2 register */
mbed_official 508:4f5903e025e6 231 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 508:4f5903e025e6 232 | (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 508:4f5903e025e6 233
mbed_official 508:4f5903e025e6 234 // Read all bytes
mbed_official 508:4f5903e025e6 235 for (count = 0; count < length; count++) {
mbed_official 508:4f5903e025e6 236 value = i2c_byte_read(obj, 0);
mbed_official 508:4f5903e025e6 237 data[count] = (char)value;
mbed_official 508:4f5903e025e6 238 }
mbed_official 508:4f5903e025e6 239
mbed_official 508:4f5903e025e6 240 // Wait transfer complete
mbed_official 508:4f5903e025e6 241 timeout = LONG_TIMEOUT;
mbed_official 508:4f5903e025e6 242 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 508:4f5903e025e6 243 timeout--;
mbed_official 508:4f5903e025e6 244 if (timeout == 0) {
mbed_official 508:4f5903e025e6 245 return -1;
mbed_official 508:4f5903e025e6 246 }
mbed_official 508:4f5903e025e6 247 }
mbed_official 508:4f5903e025e6 248
mbed_official 508:4f5903e025e6 249 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 508:4f5903e025e6 250
mbed_official 508:4f5903e025e6 251 // If not repeated start, send stop.
mbed_official 508:4f5903e025e6 252 if (stop) {
mbed_official 508:4f5903e025e6 253 i2c_stop(obj);
mbed_official 508:4f5903e025e6 254 /* Wait until STOPF flag is set */
mbed_official 508:4f5903e025e6 255 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 256 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 508:4f5903e025e6 257 timeout--;
mbed_official 508:4f5903e025e6 258 if (timeout == 0) {
mbed_official 508:4f5903e025e6 259 return -1;
mbed_official 508:4f5903e025e6 260 }
mbed_official 508:4f5903e025e6 261 }
mbed_official 508:4f5903e025e6 262 /* Clear STOP Flag */
mbed_official 508:4f5903e025e6 263 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 508:4f5903e025e6 264 }
mbed_official 508:4f5903e025e6 265
mbed_official 508:4f5903e025e6 266 return length;
mbed_official 508:4f5903e025e6 267 }
mbed_official 508:4f5903e025e6 268
mbed_official 508:4f5903e025e6 269 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 508:4f5903e025e6 270 {
mbed_official 508:4f5903e025e6 271 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 272 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 273 int timeout;
mbed_official 508:4f5903e025e6 274 int count;
mbed_official 508:4f5903e025e6 275
mbed_official 508:4f5903e025e6 276 /* update CR2 register */
mbed_official 508:4f5903e025e6 277 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 508:4f5903e025e6 278 | (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 508:4f5903e025e6 279
mbed_official 508:4f5903e025e6 280 for (count = 0; count < length; count++) {
mbed_official 508:4f5903e025e6 281 i2c_byte_write(obj, data[count]);
mbed_official 508:4f5903e025e6 282 }
mbed_official 508:4f5903e025e6 283
mbed_official 508:4f5903e025e6 284 // Wait transfer complete
mbed_official 508:4f5903e025e6 285 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 286 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 508:4f5903e025e6 287 timeout--;
mbed_official 508:4f5903e025e6 288 if (timeout == 0) {
mbed_official 508:4f5903e025e6 289 return -1;
mbed_official 508:4f5903e025e6 290 }
mbed_official 508:4f5903e025e6 291 }
mbed_official 508:4f5903e025e6 292
mbed_official 508:4f5903e025e6 293 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 508:4f5903e025e6 294
mbed_official 508:4f5903e025e6 295 // If not repeated start, send stop.
mbed_official 508:4f5903e025e6 296 if (stop) {
mbed_official 508:4f5903e025e6 297 i2c_stop(obj);
mbed_official 508:4f5903e025e6 298 /* Wait until STOPF flag is set */
mbed_official 508:4f5903e025e6 299 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 300 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 508:4f5903e025e6 301 timeout--;
mbed_official 508:4f5903e025e6 302 if (timeout == 0) {
mbed_official 508:4f5903e025e6 303 return -1;
mbed_official 508:4f5903e025e6 304 }
mbed_official 508:4f5903e025e6 305 }
mbed_official 508:4f5903e025e6 306 /* Clear STOP Flag */
mbed_official 508:4f5903e025e6 307 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 508:4f5903e025e6 308 }
mbed_official 508:4f5903e025e6 309
mbed_official 508:4f5903e025e6 310 return count;
mbed_official 508:4f5903e025e6 311 }
mbed_official 508:4f5903e025e6 312
mbed_official 508:4f5903e025e6 313 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 508:4f5903e025e6 314 {
mbed_official 508:4f5903e025e6 315 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 316 int timeout;
mbed_official 508:4f5903e025e6 317
mbed_official 508:4f5903e025e6 318 // Wait until the byte is received
mbed_official 508:4f5903e025e6 319 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 320 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 508:4f5903e025e6 321 if ((timeout--) == 0) {
mbed_official 508:4f5903e025e6 322 return -1;
mbed_official 508:4f5903e025e6 323 }
mbed_official 508:4f5903e025e6 324 }
mbed_official 508:4f5903e025e6 325
mbed_official 508:4f5903e025e6 326 return (int)i2c->RXDR;
mbed_official 508:4f5903e025e6 327 }
mbed_official 508:4f5903e025e6 328
mbed_official 508:4f5903e025e6 329 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 508:4f5903e025e6 330 {
mbed_official 508:4f5903e025e6 331 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 332 int timeout;
mbed_official 508:4f5903e025e6 333
mbed_official 508:4f5903e025e6 334 // Wait until the previous byte is transmitted
mbed_official 508:4f5903e025e6 335 timeout = FLAG_TIMEOUT;
mbed_official 508:4f5903e025e6 336 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 508:4f5903e025e6 337 if ((timeout--) == 0) {
mbed_official 508:4f5903e025e6 338 return 0;
mbed_official 508:4f5903e025e6 339 }
mbed_official 508:4f5903e025e6 340 }
mbed_official 508:4f5903e025e6 341
mbed_official 508:4f5903e025e6 342 i2c->TXDR = (uint8_t)data;
mbed_official 508:4f5903e025e6 343
mbed_official 508:4f5903e025e6 344 return 1;
mbed_official 508:4f5903e025e6 345 }
mbed_official 508:4f5903e025e6 346
mbed_official 508:4f5903e025e6 347 void i2c_reset(i2c_t *obj)
mbed_official 508:4f5903e025e6 348 {
mbed_official 508:4f5903e025e6 349 int timeout;
mbed_official 508:4f5903e025e6 350
mbed_official 508:4f5903e025e6 351 // wait before reset
mbed_official 508:4f5903e025e6 352 timeout = LONG_TIMEOUT;
mbed_official 508:4f5903e025e6 353 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 508:4f5903e025e6 354
mbed_official 508:4f5903e025e6 355 __I2C1_FORCE_RESET();
mbed_official 508:4f5903e025e6 356 __I2C1_RELEASE_RESET();
mbed_official 508:4f5903e025e6 357 }
mbed_official 508:4f5903e025e6 358
mbed_official 508:4f5903e025e6 359 #if DEVICE_I2CSLAVE
mbed_official 508:4f5903e025e6 360
mbed_official 508:4f5903e025e6 361 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 508:4f5903e025e6 362 {
mbed_official 508:4f5903e025e6 363 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 364 uint16_t tmpreg;
mbed_official 508:4f5903e025e6 365
mbed_official 508:4f5903e025e6 366 // disable
mbed_official 508:4f5903e025e6 367 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 508:4f5903e025e6 368 // Get the old register value
mbed_official 508:4f5903e025e6 369 tmpreg = i2c->OAR1;
mbed_official 508:4f5903e025e6 370 // Reset address bits
mbed_official 508:4f5903e025e6 371 tmpreg &= 0xFC00;
mbed_official 508:4f5903e025e6 372 // Set new address
mbed_official 508:4f5903e025e6 373 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 508:4f5903e025e6 374 // Store the new register value
mbed_official 508:4f5903e025e6 375 i2c->OAR1 = tmpreg;
mbed_official 508:4f5903e025e6 376 // enable
mbed_official 508:4f5903e025e6 377 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 508:4f5903e025e6 378 }
mbed_official 508:4f5903e025e6 379
mbed_official 508:4f5903e025e6 380 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 508:4f5903e025e6 381 {
mbed_official 508:4f5903e025e6 382
mbed_official 508:4f5903e025e6 383 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 384 uint16_t tmpreg;
mbed_official 508:4f5903e025e6 385
mbed_official 508:4f5903e025e6 386 // Get the old register value
mbed_official 508:4f5903e025e6 387 tmpreg = i2c->OAR1;
mbed_official 508:4f5903e025e6 388
mbed_official 508:4f5903e025e6 389 // Enable / disable slave
mbed_official 508:4f5903e025e6 390 if (enable_slave == 1) {
mbed_official 508:4f5903e025e6 391 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 508:4f5903e025e6 392 } else {
mbed_official 508:4f5903e025e6 393 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 508:4f5903e025e6 394 }
mbed_official 508:4f5903e025e6 395
mbed_official 508:4f5903e025e6 396 // Set new mode
mbed_official 508:4f5903e025e6 397 i2c->OAR1 = tmpreg;
mbed_official 508:4f5903e025e6 398
mbed_official 508:4f5903e025e6 399 }
mbed_official 508:4f5903e025e6 400
mbed_official 508:4f5903e025e6 401 // See I2CSlave.h
mbed_official 508:4f5903e025e6 402 #define NoData 0 // the slave has not been addressed
mbed_official 508:4f5903e025e6 403 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 508:4f5903e025e6 404 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 508:4f5903e025e6 405 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 508:4f5903e025e6 406
mbed_official 508:4f5903e025e6 407 int i2c_slave_receive(i2c_t *obj)
mbed_official 508:4f5903e025e6 408 {
mbed_official 508:4f5903e025e6 409 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 410 int retValue = NoData;
mbed_official 508:4f5903e025e6 411
mbed_official 508:4f5903e025e6 412 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 508:4f5903e025e6 413 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 508:4f5903e025e6 414 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 508:4f5903e025e6 415 retValue = ReadAddressed;
mbed_official 508:4f5903e025e6 416 else
mbed_official 508:4f5903e025e6 417 retValue = WriteAddressed;
mbed_official 508:4f5903e025e6 418 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 508:4f5903e025e6 419 }
mbed_official 508:4f5903e025e6 420 }
mbed_official 508:4f5903e025e6 421
mbed_official 508:4f5903e025e6 422 return (retValue);
mbed_official 508:4f5903e025e6 423 }
mbed_official 508:4f5903e025e6 424
mbed_official 508:4f5903e025e6 425 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 508:4f5903e025e6 426 {
mbed_official 508:4f5903e025e6 427 char size = 0;
mbed_official 508:4f5903e025e6 428
mbed_official 508:4f5903e025e6 429 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 508:4f5903e025e6 430
mbed_official 508:4f5903e025e6 431 return size;
mbed_official 508:4f5903e025e6 432 }
mbed_official 508:4f5903e025e6 433
mbed_official 508:4f5903e025e6 434 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 508:4f5903e025e6 435 {
mbed_official 508:4f5903e025e6 436 char size = 0;
mbed_official 508:4f5903e025e6 437 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 508:4f5903e025e6 438
mbed_official 508:4f5903e025e6 439 do {
mbed_official 508:4f5903e025e6 440 i2c_byte_write(obj, data[size]);
mbed_official 508:4f5903e025e6 441 size++;
mbed_official 508:4f5903e025e6 442 } while (size < length);
mbed_official 508:4f5903e025e6 443
mbed_official 508:4f5903e025e6 444 return size;
mbed_official 508:4f5903e025e6 445 }
mbed_official 508:4f5903e025e6 446
mbed_official 508:4f5903e025e6 447
mbed_official 508:4f5903e025e6 448 #endif // DEVICE_I2CSLAVE
mbed_official 508:4f5903e025e6 449
mbed_official 508:4f5903e025e6 450 #endif // DEVICE_I2C