long dao / mbed-src

Mbed for VNG board

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/i2c_api.c@404:cbc7dfcb0ce9, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 10:15:07 2014 +0000
Revision:
404:cbc7dfcb0ce9
Parent:
402:09075a3b15e3
Child:
414:4ec4c5b614b0
Synchronized with git revision c4901dbb33541e1dcda3fe69a1ec2a11caf496bf



Full URL: https://github.com/mbedmicro/mbed/commit/c4901dbb33541e1dcda3fe69a1ec2a11caf496bf/



Targets: NUCLEOs - Align hal files

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 80:66393a7b209d 1 /* mbed Microcontroller Library
mbed_official 80:66393a7b209d 2 *******************************************************************************
mbed_official 80:66393a7b209d 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 80:66393a7b209d 4 * All rights reserved.
mbed_official 80:66393a7b209d 5 *
mbed_official 80:66393a7b209d 6 * Redistribution and use in source and binary forms, with or without
mbed_official 80:66393a7b209d 7 * modification, are permitted provided that the following conditions are met:
mbed_official 80:66393a7b209d 8 *
mbed_official 80:66393a7b209d 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 80:66393a7b209d 10 * this list of conditions and the following disclaimer.
mbed_official 80:66393a7b209d 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 80:66393a7b209d 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 80:66393a7b209d 13 * and/or other materials provided with the distribution.
mbed_official 80:66393a7b209d 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 80:66393a7b209d 15 * may be used to endorse or promote products derived from this software
mbed_official 80:66393a7b209d 16 * without specific prior written permission.
mbed_official 80:66393a7b209d 17 *
mbed_official 80:66393a7b209d 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 80:66393a7b209d 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 80:66393a7b209d 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 80:66393a7b209d 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 80:66393a7b209d 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 80:66393a7b209d 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 80:66393a7b209d 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 80:66393a7b209d 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 80:66393a7b209d 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 80:66393a7b209d 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 80:66393a7b209d 28 *******************************************************************************
mbed_official 80:66393a7b209d 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 80:66393a7b209d 31 #include "i2c_api.h"
mbed_official 80:66393a7b209d 32
mbed_official 80:66393a7b209d 33 #if DEVICE_I2C
mbed_official 80:66393a7b209d 34
mbed_official 80:66393a7b209d 35 #include "cmsis.h"
mbed_official 80:66393a7b209d 36 #include "pinmap.h"
mbed_official 80:66393a7b209d 37
mbed_official 80:66393a7b209d 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 216:577900467c9e 39 not based on accurate values, they just guarantee that the application will
mbed_official 216:577900467c9e 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 80:66393a7b209d 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 80:66393a7b209d 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 80:66393a7b209d 43
mbed_official 80:66393a7b209d 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 340:28d1f895c6fe 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 80:66393a7b209d 48 {NC, NC, 0}
mbed_official 80:66393a7b209d 49 };
mbed_official 80:66393a7b209d 50
mbed_official 80:66393a7b209d 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 340:28d1f895c6fe 52 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 53 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 54 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 80:66393a7b209d 55 {NC, NC, 0}
mbed_official 80:66393a7b209d 56 };
mbed_official 80:66393a7b209d 57
mbed_official 340:28d1f895c6fe 58 I2C_HandleTypeDef I2cHandle;
mbed_official 340:28d1f895c6fe 59
mbed_official 305:1f0269907d8b 60 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 61 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 62
mbed_official 402:09075a3b15e3 63 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 64 {
mbed_official 80:66393a7b209d 65 // Determine the I2C to use
mbed_official 80:66393a7b209d 66 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 80:66393a7b209d 67 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 68
mbed_official 80:66393a7b209d 69 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 70 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 80:66393a7b209d 71
mbed_official 305:1f0269907d8b 72 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 73 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 74 i2c1_inited = 1;
mbed_official 340:28d1f895c6fe 75 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 340:28d1f895c6fe 76 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 77 // Configure I2C pins
mbed_official 340:28d1f895c6fe 78 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 79 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 80 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 81 pin_mode(scl, OpenDrain);
mbed_official 171:3d240fda1f07 82 }
mbed_official 404:cbc7dfcb0ce9 83
mbed_official 305:1f0269907d8b 84 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 85 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 86 i2c2_inited = 1;
mbed_official 340:28d1f895c6fe 87 __I2C2_CLK_ENABLE();
mbed_official 402:09075a3b15e3 88 // Configure I2C pins
mbed_official 402:09075a3b15e3 89 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 402:09075a3b15e3 90 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 402:09075a3b15e3 91 pin_mode(sda, OpenDrain);
mbed_official 402:09075a3b15e3 92 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 93 }
mbed_official 216:577900467c9e 94
mbed_official 80:66393a7b209d 95 // Reset to clear pending flags if any
mbed_official 80:66393a7b209d 96 i2c_reset(obj);
mbed_official 216:577900467c9e 97
mbed_official 80:66393a7b209d 98 // I2C configuration
mbed_official 216:577900467c9e 99 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 80:66393a7b209d 100 }
mbed_official 80:66393a7b209d 101
mbed_official 402:09075a3b15e3 102 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 103 {
mbed_official 340:28d1f895c6fe 104 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 340:28d1f895c6fe 105 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 106 int timeout;
mbed_official 340:28d1f895c6fe 107
mbed_official 305:1f0269907d8b 108 // wait before init
mbed_official 305:1f0269907d8b 109 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 110 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 216:577900467c9e 111
mbed_official 340:28d1f895c6fe 112 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 80:66393a7b209d 113 switch (hz) {
mbed_official 340:28d1f895c6fe 114 case 100000:
mbed_official 340:28d1f895c6fe 115 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 116 break;
mbed_official 340:28d1f895c6fe 117 case 400000:
mbed_official 340:28d1f895c6fe 118 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 119 break;
mbed_official 340:28d1f895c6fe 120 case 1000000:
mbed_official 340:28d1f895c6fe 121 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 122 break;
mbed_official 340:28d1f895c6fe 123 default:
mbed_official 340:28d1f895c6fe 124 break;
mbed_official 80:66393a7b209d 125 }
mbed_official 216:577900467c9e 126
mbed_official 80:66393a7b209d 127 // I2C configuration
mbed_official 340:28d1f895c6fe 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 340:28d1f895c6fe 129 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 340:28d1f895c6fe 130 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 340:28d1f895c6fe 131 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 340:28d1f895c6fe 132 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 340:28d1f895c6fe 133 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 340:28d1f895c6fe 134 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 340:28d1f895c6fe 135 HAL_I2C_Init(&I2cHandle);
mbed_official 80:66393a7b209d 136 }
mbed_official 80:66393a7b209d 137
mbed_official 402:09075a3b15e3 138 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 139 {
mbed_official 80:66393a7b209d 140 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 141 int timeout;
mbed_official 80:66393a7b209d 142
mbed_official 340:28d1f895c6fe 143 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 144
mbed_official 340:28d1f895c6fe 145 // Clear Acknowledge failure flag
mbed_official 340:28d1f895c6fe 146 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 147
mbed_official 340:28d1f895c6fe 148 // Generate the START condition
mbed_official 340:28d1f895c6fe 149 i2c->CR2 |= I2C_CR2_START;
mbed_official 340:28d1f895c6fe 150
mbed_official 340:28d1f895c6fe 151 // Wait the START condition has been correctly sent
mbed_official 340:28d1f895c6fe 152 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 153 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 340:28d1f895c6fe 154 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 155 return 1;
mbed_official 84:f54042cbc282 156 }
mbed_official 80:66393a7b209d 157 }
mbed_official 80:66393a7b209d 158
mbed_official 80:66393a7b209d 159 return 0;
mbed_official 80:66393a7b209d 160 }
mbed_official 80:66393a7b209d 161
mbed_official 402:09075a3b15e3 162 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 163 {
mbed_official 80:66393a7b209d 164 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 216:577900467c9e 165
mbed_official 340:28d1f895c6fe 166 // Generate the STOP condition
mbed_official 340:28d1f895c6fe 167 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 216:577900467c9e 168
mbed_official 80:66393a7b209d 169 return 0;
mbed_official 80:66393a7b209d 170 }
mbed_official 80:66393a7b209d 171
mbed_official 402:09075a3b15e3 172 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 173 {
mbed_official 80:66393a7b209d 174 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 175 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 176 int timeout;
mbed_official 80:66393a7b209d 177 int count;
mbed_official 80:66393a7b209d 178 int value;
mbed_official 216:577900467c9e 179
mbed_official 404:cbc7dfcb0ce9 180 // Update CR2 register
mbed_official 340:28d1f895c6fe 181 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 340:28d1f895c6fe 182 | (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 216:577900467c9e 183
mbed_official 80:66393a7b209d 184 // Read all bytes
mbed_official 80:66393a7b209d 185 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 186 value = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 187 data[count] = (char)value;
mbed_official 80:66393a7b209d 188 }
mbed_official 216:577900467c9e 189
mbed_official 340:28d1f895c6fe 190 // Wait transfer complete
mbed_official 197:36a724675865 191 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 192 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 197:36a724675865 193 timeout--;
mbed_official 340:28d1f895c6fe 194 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 195 return -1;
mbed_official 340:28d1f895c6fe 196 }
mbed_official 197:36a724675865 197 }
mbed_official 340:28d1f895c6fe 198 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 216:577900467c9e 199
mbed_official 340:28d1f895c6fe 200 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 201 if (stop) {
mbed_official 340:28d1f895c6fe 202 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 203 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 204 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 205 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 206 timeout--;
mbed_official 340:28d1f895c6fe 207 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 208 return -1;
mbed_official 340:28d1f895c6fe 209 }
mbed_official 340:28d1f895c6fe 210 }
mbed_official 404:cbc7dfcb0ce9 211 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 212 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 213 }
mbed_official 197:36a724675865 214
mbed_official 80:66393a7b209d 215 return length;
mbed_official 80:66393a7b209d 216 }
mbed_official 80:66393a7b209d 217
mbed_official 402:09075a3b15e3 218 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 219 {
mbed_official 80:66393a7b209d 220 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 221 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 222 int timeout;
mbed_official 80:66393a7b209d 223 int count;
mbed_official 216:577900467c9e 224
mbed_official 404:cbc7dfcb0ce9 225 // Update CR2 register
mbed_official 340:28d1f895c6fe 226 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 340:28d1f895c6fe 227 | (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 216:577900467c9e 228
mbed_official 80:66393a7b209d 229 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 230 i2c_byte_write(obj, data[count]);
mbed_official 216:577900467c9e 231 }
mbed_official 216:577900467c9e 232
mbed_official 340:28d1f895c6fe 233 // Wait transfer complete
mbed_official 197:36a724675865 234 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 235 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 197:36a724675865 236 timeout--;
mbed_official 340:28d1f895c6fe 237 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 238 return -1;
mbed_official 340:28d1f895c6fe 239 }
mbed_official 80:66393a7b209d 240 }
mbed_official 340:28d1f895c6fe 241 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 80:66393a7b209d 242
mbed_official 404:cbc7dfcb0ce9 243 // If not repeated start, send stop
mbed_official 340:28d1f895c6fe 244 if (stop) {
mbed_official 340:28d1f895c6fe 245 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 246 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 247 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 248 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 249 timeout--;
mbed_official 340:28d1f895c6fe 250 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 251 return -1;
mbed_official 340:28d1f895c6fe 252 }
mbed_official 340:28d1f895c6fe 253 }
mbed_official 404:cbc7dfcb0ce9 254 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 255 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 256 }
mbed_official 216:577900467c9e 257
mbed_official 80:66393a7b209d 258 return count;
mbed_official 80:66393a7b209d 259 }
mbed_official 80:66393a7b209d 260
mbed_official 402:09075a3b15e3 261 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 262 {
mbed_official 80:66393a7b209d 263 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 264 int timeout;
mbed_official 216:577900467c9e 265
mbed_official 80:66393a7b209d 266 // Wait until the byte is received
mbed_official 216:577900467c9e 267 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 268 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 269 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 270 return -1;
mbed_official 84:f54042cbc282 271 }
mbed_official 80:66393a7b209d 272 }
mbed_official 80:66393a7b209d 273
mbed_official 340:28d1f895c6fe 274 return (int)i2c->RXDR;
mbed_official 80:66393a7b209d 275 }
mbed_official 80:66393a7b209d 276
mbed_official 402:09075a3b15e3 277 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 278 {
mbed_official 80:66393a7b209d 279 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 280 int timeout;
mbed_official 80:66393a7b209d 281
mbed_official 84:f54042cbc282 282 // Wait until the previous byte is transmitted
mbed_official 84:f54042cbc282 283 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 284 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 340:28d1f895c6fe 285 if ((timeout--) == 0) {
mbed_official 84:f54042cbc282 286 return 0;
mbed_official 84:f54042cbc282 287 }
mbed_official 80:66393a7b209d 288 }
mbed_official 216:577900467c9e 289
mbed_official 340:28d1f895c6fe 290 i2c->TXDR = (uint8_t)data;
mbed_official 216:577900467c9e 291
mbed_official 80:66393a7b209d 292 return 1;
mbed_official 80:66393a7b209d 293 }
mbed_official 80:66393a7b209d 294
mbed_official 402:09075a3b15e3 295 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 296 {
mbed_official 305:1f0269907d8b 297 int timeout;
mbed_official 402:09075a3b15e3 298
mbed_official 404:cbc7dfcb0ce9 299 // Wait before reset
mbed_official 305:1f0269907d8b 300 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 301 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 302
mbed_official 216:577900467c9e 303 if (obj->i2c == I2C_1) {
mbed_official 340:28d1f895c6fe 304 __I2C1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 305 __I2C1_RELEASE_RESET();
mbed_official 80:66393a7b209d 306 }
mbed_official 171:3d240fda1f07 307 if (obj->i2c == I2C_2) {
mbed_official 340:28d1f895c6fe 308 __I2C2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 309 __I2C2_RELEASE_RESET();
mbed_official 171:3d240fda1f07 310 }
mbed_official 80:66393a7b209d 311 }
mbed_official 80:66393a7b209d 312
mbed_official 80:66393a7b209d 313 #if DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 314
mbed_official 402:09075a3b15e3 315 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 316 {
mbed_official 80:66393a7b209d 317 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 318 uint16_t tmpreg = 0;
mbed_official 216:577900467c9e 319
mbed_official 340:28d1f895c6fe 320 // disable
mbed_official 340:28d1f895c6fe 321 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 80:66393a7b209d 322 // Get the old register value
mbed_official 80:66393a7b209d 323 tmpreg = i2c->OAR1;
mbed_official 80:66393a7b209d 324 // Reset address bits
mbed_official 80:66393a7b209d 325 tmpreg &= 0xFC00;
mbed_official 80:66393a7b209d 326 // Set new address
mbed_official 80:66393a7b209d 327 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 80:66393a7b209d 328 // Store the new register value
mbed_official 340:28d1f895c6fe 329 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 330 // enable
mbed_official 340:28d1f895c6fe 331 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 80:66393a7b209d 332 }
mbed_official 80:66393a7b209d 333
mbed_official 402:09075a3b15e3 334 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 335 {
mbed_official 340:28d1f895c6fe 336 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 337 uint16_t tmpreg;
mbed_official 340:28d1f895c6fe 338
mbed_official 340:28d1f895c6fe 339 // Get the old register value
mbed_official 340:28d1f895c6fe 340 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 341
mbed_official 340:28d1f895c6fe 342 // Enable / disable slave
mbed_official 340:28d1f895c6fe 343 if (enable_slave == 1) {
mbed_official 340:28d1f895c6fe 344 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 345 } else {
mbed_official 340:28d1f895c6fe 346 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 347 }
mbed_official 340:28d1f895c6fe 348
mbed_official 340:28d1f895c6fe 349 // Set new mode
mbed_official 340:28d1f895c6fe 350 i2c->OAR1 = tmpreg;
mbed_official 80:66393a7b209d 351 }
mbed_official 80:66393a7b209d 352
mbed_official 80:66393a7b209d 353 // See I2CSlave.h
mbed_official 80:66393a7b209d 354 #define NoData 0 // the slave has not been addressed
mbed_official 80:66393a7b209d 355 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 80:66393a7b209d 356 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 80:66393a7b209d 357 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 80:66393a7b209d 358
mbed_official 402:09075a3b15e3 359 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 360 {
mbed_official 340:28d1f895c6fe 361 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 362 int retValue = NoData;
mbed_official 216:577900467c9e 363
mbed_official 340:28d1f895c6fe 364 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 340:28d1f895c6fe 365 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 340:28d1f895c6fe 366 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 340:28d1f895c6fe 367 retValue = ReadAddressed;
mbed_official 340:28d1f895c6fe 368 else
mbed_official 340:28d1f895c6fe 369 retValue = WriteAddressed;
mbed_official 340:28d1f895c6fe 370
mbed_official 340:28d1f895c6fe 371 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 176:2d0c9ad7ef62 372 }
mbed_official 176:2d0c9ad7ef62 373 }
mbed_official 340:28d1f895c6fe 374
mbed_official 340:28d1f895c6fe 375 return (retValue);
mbed_official 80:66393a7b209d 376 }
mbed_official 80:66393a7b209d 377
mbed_official 402:09075a3b15e3 378 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 379 {
mbed_official 340:28d1f895c6fe 380 char size = 0;
mbed_official 216:577900467c9e 381
mbed_official 340:28d1f895c6fe 382 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 216:577900467c9e 383
mbed_official 340:28d1f895c6fe 384 return size;
mbed_official 80:66393a7b209d 385 }
mbed_official 80:66393a7b209d 386
mbed_official 402:09075a3b15e3 387 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 388 {
mbed_official 340:28d1f895c6fe 389 char size = 0;
mbed_official 340:28d1f895c6fe 390 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 216:577900467c9e 391
mbed_official 340:28d1f895c6fe 392 do {
mbed_official 340:28d1f895c6fe 393 i2c_byte_write(obj, data[size]);
mbed_official 340:28d1f895c6fe 394 size++;
mbed_official 340:28d1f895c6fe 395 } while (size < length);
mbed_official 216:577900467c9e 396
mbed_official 340:28d1f895c6fe 397 return size;
mbed_official 80:66393a7b209d 398 }
mbed_official 80:66393a7b209d 399
mbed_official 80:66393a7b209d 400
mbed_official 80:66393a7b209d 401 #endif // DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 402
mbed_official 80:66393a7b209d 403 #endif // DEVICE_I2C