mbed official / mbed-src

mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/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 219:993c9b0acbcc 1 /* mbed Microcontroller Library
mbed_official 219:993c9b0acbcc 2 *******************************************************************************
mbed_official 219:993c9b0acbcc 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 219:993c9b0acbcc 4 * All rights reserved.
mbed_official 219:993c9b0acbcc 5 *
mbed_official 219:993c9b0acbcc 6 * Redistribution and use in source and binary forms, with or without
mbed_official 219:993c9b0acbcc 7 * modification, are permitted provided that the following conditions are met:
mbed_official 219:993c9b0acbcc 8 *
mbed_official 219:993c9b0acbcc 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 219:993c9b0acbcc 10 * this list of conditions and the following disclaimer.
mbed_official 219:993c9b0acbcc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 219:993c9b0acbcc 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 219:993c9b0acbcc 13 * and/or other materials provided with the distribution.
mbed_official 219:993c9b0acbcc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 219:993c9b0acbcc 15 * may be used to endorse or promote products derived from this software
mbed_official 219:993c9b0acbcc 16 * without specific prior written permission.
mbed_official 219:993c9b0acbcc 17 *
mbed_official 219:993c9b0acbcc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 219:993c9b0acbcc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 219:993c9b0acbcc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 219:993c9b0acbcc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 219:993c9b0acbcc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 219:993c9b0acbcc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 219:993c9b0acbcc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 219:993c9b0acbcc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 219:993c9b0acbcc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 219:993c9b0acbcc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 219:993c9b0acbcc 28 *******************************************************************************
mbed_official 219:993c9b0acbcc 29 */
mbed_official 239:8cadf13dff33 30 #include "mbed_assert.h"
mbed_official 219:993c9b0acbcc 31 #include "i2c_api.h"
mbed_official 219:993c9b0acbcc 32
mbed_official 219:993c9b0acbcc 33 #if DEVICE_I2C
mbed_official 219:993c9b0acbcc 34
mbed_official 219:993c9b0acbcc 35 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 36 #include "pinmap.h"
mbed_official 219:993c9b0acbcc 37
mbed_official 219:993c9b0acbcc 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 219:993c9b0acbcc 39 not based on accurate values, they just guarantee that the application will
mbed_official 219:993c9b0acbcc 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 219:993c9b0acbcc 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 219:993c9b0acbcc 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 219:993c9b0acbcc 43
mbed_official 219:993c9b0acbcc 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 219:993c9b0acbcc 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 48 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 49 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 50 };
mbed_official 219:993c9b0acbcc 51
mbed_official 219:993c9b0acbcc 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 219:993c9b0acbcc 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 55 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 56 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 57 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 58 };
mbed_official 219:993c9b0acbcc 59
mbed_official 219:993c9b0acbcc 60 I2C_HandleTypeDef I2cHandle;
mbed_official 219:993c9b0acbcc 61
mbed_official 305:1f0269907d8b 62 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 63 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 64
mbed_official 402:09075a3b15e3 65 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 66 {
mbed_official 219:993c9b0acbcc 67 // Determine the I2C to use
mbed_official 219:993c9b0acbcc 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 70
mbed_official 219:993c9b0acbcc 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 239:8cadf13dff33 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 219:993c9b0acbcc 73
mbed_official 305:1f0269907d8b 74 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 75 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 76 i2c1_inited = 1;
mbed_official 219:993c9b0acbcc 77 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 219:993c9b0acbcc 78 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 79 // Configure I2C pins
mbed_official 305:1f0269907d8b 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 82 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 83 pin_mode(scl, OpenDrain);
mbed_official 219:993c9b0acbcc 84 }
mbed_official 404:cbc7dfcb0ce9 85
mbed_official 305:1f0269907d8b 86 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 87 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 88 i2c2_inited = 1;
mbed_official 219:993c9b0acbcc 89 __I2C2_CLK_ENABLE();
mbed_official 402:09075a3b15e3 90 // Configure I2C pins
mbed_official 402:09075a3b15e3 91 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 402:09075a3b15e3 92 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 402:09075a3b15e3 93 pin_mode(sda, OpenDrain);
mbed_official 402:09075a3b15e3 94 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 95 }
mbed_official 219:993c9b0acbcc 96
mbed_official 219:993c9b0acbcc 97 // Reset to clear pending flags if any
mbed_official 219:993c9b0acbcc 98 i2c_reset(obj);
mbed_official 219:993c9b0acbcc 99
mbed_official 219:993c9b0acbcc 100 // I2C configuration
mbed_official 219:993c9b0acbcc 101 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 219:993c9b0acbcc 102 }
mbed_official 219:993c9b0acbcc 103
mbed_official 402:09075a3b15e3 104 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 105 {
mbed_official 239:8cadf13dff33 106 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 305:1f0269907d8b 107 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 108 int timeout;
mbed_official 239:8cadf13dff33 109
mbed_official 305:1f0269907d8b 110 // wait before init
mbed_official 305:1f0269907d8b 111 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 112 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 219:993c9b0acbcc 113
mbed_official 219:993c9b0acbcc 114 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 219:993c9b0acbcc 115 switch (hz) {
mbed_official 219:993c9b0acbcc 116 case 100000:
mbed_official 219:993c9b0acbcc 117 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 118 break;
mbed_official 219:993c9b0acbcc 119 case 400000:
mbed_official 219:993c9b0acbcc 120 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 121 break;
mbed_official 219:993c9b0acbcc 122 case 1000000:
mbed_official 219:993c9b0acbcc 123 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 124 break;
mbed_official 219:993c9b0acbcc 125 default:
mbed_official 219:993c9b0acbcc 126 break;
mbed_official 219:993c9b0acbcc 127 }
mbed_official 219:993c9b0acbcc 128
mbed_official 219:993c9b0acbcc 129 // I2C configuration
mbed_official 219:993c9b0acbcc 130 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 219:993c9b0acbcc 131 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 219:993c9b0acbcc 132 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 219:993c9b0acbcc 133 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 219:993c9b0acbcc 134 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 219:993c9b0acbcc 135 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 219:993c9b0acbcc 136 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 219:993c9b0acbcc 137 HAL_I2C_Init(&I2cHandle);
mbed_official 219:993c9b0acbcc 138 }
mbed_official 219:993c9b0acbcc 139
mbed_official 402:09075a3b15e3 140 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 141 {
mbed_official 219:993c9b0acbcc 142 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 143 int timeout;
mbed_official 219:993c9b0acbcc 144
mbed_official 219:993c9b0acbcc 145 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 146
mbed_official 219:993c9b0acbcc 147 // Clear Acknowledge failure flag
mbed_official 219:993c9b0acbcc 148 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 219:993c9b0acbcc 149
mbed_official 219:993c9b0acbcc 150 // Generate the START condition
mbed_official 219:993c9b0acbcc 151 i2c->CR2 |= I2C_CR2_START;
mbed_official 219:993c9b0acbcc 152
mbed_official 219:993c9b0acbcc 153 // Wait the START condition has been correctly sent
mbed_official 219:993c9b0acbcc 154 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 155 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 219:993c9b0acbcc 156 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 157 return 1;
mbed_official 219:993c9b0acbcc 158 }
mbed_official 219:993c9b0acbcc 159 }
mbed_official 219:993c9b0acbcc 160
mbed_official 219:993c9b0acbcc 161 return 0;
mbed_official 219:993c9b0acbcc 162 }
mbed_official 219:993c9b0acbcc 163
mbed_official 402:09075a3b15e3 164 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 165 {
mbed_official 219:993c9b0acbcc 166 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 167
mbed_official 219:993c9b0acbcc 168 // Generate the STOP condition
mbed_official 219:993c9b0acbcc 169 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 219:993c9b0acbcc 170
mbed_official 219:993c9b0acbcc 171 return 0;
mbed_official 219:993c9b0acbcc 172 }
mbed_official 219:993c9b0acbcc 173
mbed_official 402:09075a3b15e3 174 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 175 {
mbed_official 219:993c9b0acbcc 176 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 177 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 178 int timeout;
mbed_official 219:993c9b0acbcc 179 int count;
mbed_official 219:993c9b0acbcc 180 int value;
mbed_official 219:993c9b0acbcc 181
mbed_official 404:cbc7dfcb0ce9 182 // Update CR2 register
mbed_official 219:993c9b0acbcc 183 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 219:993c9b0acbcc 184 | (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 219:993c9b0acbcc 185
mbed_official 219:993c9b0acbcc 186 // Read all bytes
mbed_official 219:993c9b0acbcc 187 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 188 value = i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 189 data[count] = (char)value;
mbed_official 219:993c9b0acbcc 190 }
mbed_official 219:993c9b0acbcc 191
mbed_official 219:993c9b0acbcc 192 // Wait transfer complete
mbed_official 219:993c9b0acbcc 193 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 194 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 195 timeout--;
mbed_official 219:993c9b0acbcc 196 if (timeout == 0) {
mbed_official 247:135e3186a638 197 return -1;
mbed_official 219:993c9b0acbcc 198 }
mbed_official 219:993c9b0acbcc 199 }
mbed_official 219:993c9b0acbcc 200 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 201
mbed_official 219:993c9b0acbcc 202 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 203 if (stop) {
mbed_official 219:993c9b0acbcc 204 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 205 // Wait until STOPF flag is set
mbed_official 219:993c9b0acbcc 206 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 207 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 208 timeout--;
mbed_official 219:993c9b0acbcc 209 if (timeout == 0) {
mbed_official 247:135e3186a638 210 return -1;
mbed_official 219:993c9b0acbcc 211 }
mbed_official 219:993c9b0acbcc 212 }
mbed_official 404:cbc7dfcb0ce9 213 // Clear STOP Flag
mbed_official 219:993c9b0acbcc 214 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 215 }
mbed_official 219:993c9b0acbcc 216
mbed_official 219:993c9b0acbcc 217 return length;
mbed_official 219:993c9b0acbcc 218 }
mbed_official 219:993c9b0acbcc 219
mbed_official 402:09075a3b15e3 220 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 221 {
mbed_official 219:993c9b0acbcc 222 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 223 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 224 int timeout;
mbed_official 219:993c9b0acbcc 225 int count;
mbed_official 219:993c9b0acbcc 226
mbed_official 404:cbc7dfcb0ce9 227 // Update CR2 register
mbed_official 219:993c9b0acbcc 228 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 219:993c9b0acbcc 229 | (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 219:993c9b0acbcc 230
mbed_official 219:993c9b0acbcc 231 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 232 i2c_byte_write(obj, data[count]);
mbed_official 219:993c9b0acbcc 233 }
mbed_official 219:993c9b0acbcc 234
mbed_official 219:993c9b0acbcc 235 // Wait transfer complete
mbed_official 219:993c9b0acbcc 236 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 237 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 238 timeout--;
mbed_official 219:993c9b0acbcc 239 if (timeout == 0) {
mbed_official 247:135e3186a638 240 return -1;
mbed_official 219:993c9b0acbcc 241 }
mbed_official 219:993c9b0acbcc 242 }
mbed_official 219:993c9b0acbcc 243 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 244
mbed_official 404:cbc7dfcb0ce9 245 // If not repeated start, send stop
mbed_official 219:993c9b0acbcc 246 if (stop) {
mbed_official 219:993c9b0acbcc 247 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 248 // Wait until STOPF flag is set
mbed_official 219:993c9b0acbcc 249 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 250 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 251 timeout--;
mbed_official 219:993c9b0acbcc 252 if (timeout == 0) {
mbed_official 247:135e3186a638 253 return -1;
mbed_official 219:993c9b0acbcc 254 }
mbed_official 219:993c9b0acbcc 255 }
mbed_official 404:cbc7dfcb0ce9 256 // Clear STOP Flag
mbed_official 219:993c9b0acbcc 257 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 258 }
mbed_official 219:993c9b0acbcc 259
mbed_official 219:993c9b0acbcc 260 return count;
mbed_official 219:993c9b0acbcc 261 }
mbed_official 219:993c9b0acbcc 262
mbed_official 402:09075a3b15e3 263 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 264 {
mbed_official 219:993c9b0acbcc 265 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 266 int timeout;
mbed_official 219:993c9b0acbcc 267
mbed_official 219:993c9b0acbcc 268 // Wait until the byte is received
mbed_official 219:993c9b0acbcc 269 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 270 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 219:993c9b0acbcc 271 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 272 return -1;
mbed_official 219:993c9b0acbcc 273 }
mbed_official 219:993c9b0acbcc 274 }
mbed_official 219:993c9b0acbcc 275
mbed_official 219:993c9b0acbcc 276 return (int)i2c->RXDR;
mbed_official 219:993c9b0acbcc 277 }
mbed_official 219:993c9b0acbcc 278
mbed_official 402:09075a3b15e3 279 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 280 {
mbed_official 219:993c9b0acbcc 281 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 282 int timeout;
mbed_official 219:993c9b0acbcc 283
mbed_official 219:993c9b0acbcc 284 // Wait until the previous byte is transmitted
mbed_official 219:993c9b0acbcc 285 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 286 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 219:993c9b0acbcc 287 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 288 return 0;
mbed_official 219:993c9b0acbcc 289 }
mbed_official 219:993c9b0acbcc 290 }
mbed_official 219:993c9b0acbcc 291
mbed_official 219:993c9b0acbcc 292 i2c->TXDR = (uint8_t)data;
mbed_official 219:993c9b0acbcc 293
mbed_official 219:993c9b0acbcc 294 return 1;
mbed_official 219:993c9b0acbcc 295 }
mbed_official 219:993c9b0acbcc 296
mbed_official 402:09075a3b15e3 297 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 298 {
mbed_official 305:1f0269907d8b 299 int timeout;
mbed_official 402:09075a3b15e3 300
mbed_official 404:cbc7dfcb0ce9 301 // Wait before reset
mbed_official 305:1f0269907d8b 302 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 303 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 304
mbed_official 219:993c9b0acbcc 305 if (obj->i2c == I2C_1) {
mbed_official 219:993c9b0acbcc 306 __I2C1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 307 __I2C1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 308 }
mbed_official 219:993c9b0acbcc 309 if (obj->i2c == I2C_2) {
mbed_official 219:993c9b0acbcc 310 __I2C2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 311 __I2C2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 312 }
mbed_official 219:993c9b0acbcc 313 }
mbed_official 219:993c9b0acbcc 314
mbed_official 219:993c9b0acbcc 315 #if DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 316
mbed_official 402:09075a3b15e3 317 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 318 {
mbed_official 219:993c9b0acbcc 319 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 320 uint16_t tmpreg = 0;
mbed_official 219:993c9b0acbcc 321
mbed_official 219:993c9b0acbcc 322 // disable
mbed_official 219:993c9b0acbcc 323 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 324 // Get the old register value
mbed_official 219:993c9b0acbcc 325 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 326 // Reset address bits
mbed_official 219:993c9b0acbcc 327 tmpreg &= 0xFC00;
mbed_official 219:993c9b0acbcc 328 // Set new address
mbed_official 219:993c9b0acbcc 329 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 219:993c9b0acbcc 330 // Store the new register value
mbed_official 219:993c9b0acbcc 331 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 332 // enable
mbed_official 219:993c9b0acbcc 333 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 334 }
mbed_official 219:993c9b0acbcc 335
mbed_official 402:09075a3b15e3 336 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 337 {
mbed_official 219:993c9b0acbcc 338 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 339 uint16_t tmpreg;
mbed_official 219:993c9b0acbcc 340
mbed_official 219:993c9b0acbcc 341 // Get the old register value
mbed_official 219:993c9b0acbcc 342 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 343
mbed_official 219:993c9b0acbcc 344 // Enable / disable slave
mbed_official 219:993c9b0acbcc 345 if (enable_slave == 1) {
mbed_official 219:993c9b0acbcc 346 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 347 } else {
mbed_official 219:993c9b0acbcc 348 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 349 }
mbed_official 219:993c9b0acbcc 350
mbed_official 219:993c9b0acbcc 351 // Set new mode
mbed_official 219:993c9b0acbcc 352 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 353 }
mbed_official 219:993c9b0acbcc 354
mbed_official 219:993c9b0acbcc 355 // See I2CSlave.h
mbed_official 219:993c9b0acbcc 356 #define NoData 0 // the slave has not been addressed
mbed_official 219:993c9b0acbcc 357 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 219:993c9b0acbcc 358 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 219:993c9b0acbcc 359 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 219:993c9b0acbcc 360
mbed_official 402:09075a3b15e3 361 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 362 {
mbed_official 219:993c9b0acbcc 363 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 364 int retValue = NoData;
mbed_official 219:993c9b0acbcc 365
mbed_official 219:993c9b0acbcc 366 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 219:993c9b0acbcc 367 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 219:993c9b0acbcc 368 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 219:993c9b0acbcc 369 retValue = ReadAddressed;
mbed_official 219:993c9b0acbcc 370 else
mbed_official 219:993c9b0acbcc 371 retValue = WriteAddressed;
mbed_official 219:993c9b0acbcc 372
mbed_official 219:993c9b0acbcc 373 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 219:993c9b0acbcc 374 }
mbed_official 219:993c9b0acbcc 375 }
mbed_official 219:993c9b0acbcc 376
mbed_official 219:993c9b0acbcc 377 return (retValue);
mbed_official 219:993c9b0acbcc 378 }
mbed_official 219:993c9b0acbcc 379
mbed_official 402:09075a3b15e3 380 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 381 {
mbed_official 219:993c9b0acbcc 382 char size = 0;
mbed_official 219:993c9b0acbcc 383
mbed_official 219:993c9b0acbcc 384 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 385
mbed_official 219:993c9b0acbcc 386 return size;
mbed_official 219:993c9b0acbcc 387 }
mbed_official 219:993c9b0acbcc 388
mbed_official 402:09075a3b15e3 389 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 390 {
mbed_official 219:993c9b0acbcc 391 char size = 0;
mbed_official 219:993c9b0acbcc 392 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 393
mbed_official 219:993c9b0acbcc 394 do {
mbed_official 219:993c9b0acbcc 395 i2c_byte_write(obj, data[size]);
mbed_official 219:993c9b0acbcc 396 size++;
mbed_official 219:993c9b0acbcc 397 } while (size < length);
mbed_official 219:993c9b0acbcc 398
mbed_official 219:993c9b0acbcc 399 return size;
mbed_official 219:993c9b0acbcc 400 }
mbed_official 219:993c9b0acbcc 401
mbed_official 219:993c9b0acbcc 402
mbed_official 219:993c9b0acbcc 403 #endif // DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 404
mbed_official 219:993c9b0acbcc 405 #endif // DEVICE_I2C