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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_L053R8/i2c_api.c@268:402bcc0c870b, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 19:00:07 2014 +0100
Revision:
268:402bcc0c870b
Parent:
251:de9a1e4ffd79
Child:
285:31249416b6f9
Synchronized with git revision 490d1a6606b3138f165c5edf2f2370ca616587c0



Full URL: https://github.com/mbedmicro/mbed/commit/490d1a6606b3138f165c5edf2f2370ca616587c0/



[LPC1114] Sleep fix + some device.h settings

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 181:a4cbdfbbd2f4 31 #include "i2c_api.h"
mbed_official 181:a4cbdfbbd2f4 32
mbed_official 181:a4cbdfbbd2f4 33 #if DEVICE_I2C
mbed_official 181:a4cbdfbbd2f4 34
mbed_official 181:a4cbdfbbd2f4 35 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "pinmap.h"
mbed_official 251:de9a1e4ffd79 37 #include "error.h"
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 181:a4cbdfbbd2f4 40 not based on accurate values, they just guarantee that the application will
mbed_official 181:a4cbdfbbd2f4 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 181:a4cbdfbbd2f4 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 181:a4cbdfbbd2f4 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 181:a4cbdfbbd2f4 44
mbed_official 181:a4cbdfbbd2f4 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 181:a4cbdfbbd2f4 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 48 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 49 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 50 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 51 };
mbed_official 181:a4cbdfbbd2f4 52
mbed_official 181:a4cbdfbbd2f4 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 181:a4cbdfbbd2f4 54 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 55 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 56 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 57 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 58 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 59 };
mbed_official 181:a4cbdfbbd2f4 60
mbed_official 181:a4cbdfbbd2f4 61 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 62
mbed_official 181:a4cbdfbbd2f4 63 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 181:a4cbdfbbd2f4 64 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 65 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 66 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 67
mbed_official 181:a4cbdfbbd2f4 68 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 69 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 70
mbed_official 181:a4cbdfbbd2f4 71 // Enable I2C clock
mbed_official 181:a4cbdfbbd2f4 72 if (obj->i2c == I2C_1) {
mbed_official 210:45934c3d812a 73 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 74 __I2C1_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 75 }
mbed_official 181:a4cbdfbbd2f4 76 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 77 __I2C2_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 78 }
mbed_official 181:a4cbdfbbd2f4 79
mbed_official 181:a4cbdfbbd2f4 80 // Configure I2C pins
mbed_official 181:a4cbdfbbd2f4 81 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 82 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 83 pin_mode(sda, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 84 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 85
mbed_official 181:a4cbdfbbd2f4 86 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 87 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 88
mbed_official 181:a4cbdfbbd2f4 89 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 90 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 91 }
mbed_official 181:a4cbdfbbd2f4 92
mbed_official 181:a4cbdfbbd2f4 93 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 94 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 95 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 98 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 99 case 100000:
mbed_official 181:a4cbdfbbd2f4 100 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 101 break;
mbed_official 181:a4cbdfbbd2f4 102 case 400000:
mbed_official 181:a4cbdfbbd2f4 103 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 104 break;
mbed_official 181:a4cbdfbbd2f4 105 case 1000000:
mbed_official 181:a4cbdfbbd2f4 106 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 107 break;
mbed_official 181:a4cbdfbbd2f4 108 default:
mbed_official 181:a4cbdfbbd2f4 109 break;
mbed_official 181:a4cbdfbbd2f4 110 }
mbed_official 181:a4cbdfbbd2f4 111
mbed_official 181:a4cbdfbbd2f4 112 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 113 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 116 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 119 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 120 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 121 }
mbed_official 181:a4cbdfbbd2f4 122
mbed_official 181:a4cbdfbbd2f4 123 inline int i2c_start(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 125 int timeout;
mbed_official 181:a4cbdfbbd2f4 126
mbed_official 181:a4cbdfbbd2f4 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 128
mbed_official 181:a4cbdfbbd2f4 129 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 130 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 131
mbed_official 181:a4cbdfbbd2f4 132 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 133 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 134
mbed_official 181:a4cbdfbbd2f4 135 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 136 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 137 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 138 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 139 return 1;
mbed_official 181:a4cbdfbbd2f4 140 }
mbed_official 181:a4cbdfbbd2f4 141 }
mbed_official 181:a4cbdfbbd2f4 142
mbed_official 181:a4cbdfbbd2f4 143 return 0;
mbed_official 181:a4cbdfbbd2f4 144 }
mbed_official 181:a4cbdfbbd2f4 145
mbed_official 181:a4cbdfbbd2f4 146 inline int i2c_stop(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 148
mbed_official 181:a4cbdfbbd2f4 149 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 150 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 151
mbed_official 181:a4cbdfbbd2f4 152 return 0;
mbed_official 181:a4cbdfbbd2f4 153 }
mbed_official 181:a4cbdfbbd2f4 154
mbed_official 181:a4cbdfbbd2f4 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 202:bd6461c07541 156 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 157 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 158 int timeout;
mbed_official 202:bd6461c07541 159 int count;
mbed_official 202:bd6461c07541 160 int value;
mbed_official 202:bd6461c07541 161
mbed_official 202:bd6461c07541 162 /* update CR2 register */
mbed_official 202:bd6461c07541 163 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 211:fb8edfff6ae1 164 | (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 211:fb8edfff6ae1 165
mbed_official 202:bd6461c07541 166 // Read all bytes
mbed_official 202:bd6461c07541 167 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 168 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 169 data[count] = (char)value;
mbed_official 202:bd6461c07541 170 }
mbed_official 181:a4cbdfbbd2f4 171
mbed_official 202:bd6461c07541 172 // Wait transfer complete
mbed_official 202:bd6461c07541 173 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 175 timeout--;
mbed_official 202:bd6461c07541 176 if (timeout == 0) {
mbed_official 247:135e3186a638 177 return -1;
mbed_official 202:bd6461c07541 178 }
mbed_official 202:bd6461c07541 179 }
mbed_official 211:fb8edfff6ae1 180
mbed_official 211:fb8edfff6ae1 181 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 182
mbed_official 202:bd6461c07541 183 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 184 if (stop) {
mbed_official 202:bd6461c07541 185 i2c_stop(obj);
mbed_official 202:bd6461c07541 186 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 187 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 188 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 189 timeout--;
mbed_official 202:bd6461c07541 190 if (timeout == 0) {
mbed_official 247:135e3186a638 191 return -1;
mbed_official 202:bd6461c07541 192 }
mbed_official 202:bd6461c07541 193 }
mbed_official 202:bd6461c07541 194 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 195 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 196 }
mbed_official 181:a4cbdfbbd2f4 197
mbed_official 181:a4cbdfbbd2f4 198 return length;
mbed_official 181:a4cbdfbbd2f4 199 }
mbed_official 181:a4cbdfbbd2f4 200
mbed_official 181:a4cbdfbbd2f4 201 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 202:bd6461c07541 202 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 203 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 204 int timeout;
mbed_official 202:bd6461c07541 205 int count;
mbed_official 202:bd6461c07541 206
mbed_official 202:bd6461c07541 207 /* update CR2 register */
mbed_official 202:bd6461c07541 208 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 211:fb8edfff6ae1 209 | (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 181:a4cbdfbbd2f4 210
mbed_official 202:bd6461c07541 211 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 212 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 213 }
mbed_official 181:a4cbdfbbd2f4 214
mbed_official 202:bd6461c07541 215 // Wait transfer complete
mbed_official 202:bd6461c07541 216 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 217 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 218 timeout--;
mbed_official 202:bd6461c07541 219 if (timeout == 0) {
mbed_official 247:135e3186a638 220 return -1;
mbed_official 211:fb8edfff6ae1 221 }
mbed_official 202:bd6461c07541 222 }
mbed_official 211:fb8edfff6ae1 223
mbed_official 211:fb8edfff6ae1 224 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 225
mbed_official 202:bd6461c07541 226 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 227 if (stop) {
mbed_official 202:bd6461c07541 228 i2c_stop(obj);
mbed_official 202:bd6461c07541 229 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 230 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 232 timeout--;
mbed_official 202:bd6461c07541 233 if (timeout == 0) {
mbed_official 247:135e3186a638 234 return -1;
mbed_official 202:bd6461c07541 235 }
mbed_official 202:bd6461c07541 236 }
mbed_official 202:bd6461c07541 237 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 238 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 239 }
mbed_official 202:bd6461c07541 240
mbed_official 202:bd6461c07541 241 return count;
mbed_official 181:a4cbdfbbd2f4 242 }
mbed_official 181:a4cbdfbbd2f4 243
mbed_official 181:a4cbdfbbd2f4 244 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 245 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 246 int timeout;
mbed_official 181:a4cbdfbbd2f4 247
mbed_official 181:a4cbdfbbd2f4 248 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 249 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 250 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 251 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 252 return -1;
mbed_official 181:a4cbdfbbd2f4 253 }
mbed_official 181:a4cbdfbbd2f4 254 }
mbed_official 181:a4cbdfbbd2f4 255
mbed_official 181:a4cbdfbbd2f4 256 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 257 }
mbed_official 181:a4cbdfbbd2f4 258
mbed_official 181:a4cbdfbbd2f4 259 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 181:a4cbdfbbd2f4 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 261 int timeout;
mbed_official 181:a4cbdfbbd2f4 262
mbed_official 202:bd6461c07541 263 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 264 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 266 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 267 return 0;
mbed_official 181:a4cbdfbbd2f4 268 }
mbed_official 181:a4cbdfbbd2f4 269 }
mbed_official 181:a4cbdfbbd2f4 270
mbed_official 202:bd6461c07541 271 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 272
mbed_official 181:a4cbdfbbd2f4 273 return 1;
mbed_official 181:a4cbdfbbd2f4 274 }
mbed_official 181:a4cbdfbbd2f4 275
mbed_official 181:a4cbdfbbd2f4 276 void i2c_reset(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 277 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 278 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 279 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 280 }
mbed_official 181:a4cbdfbbd2f4 281 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 282 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 283 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 284 }
mbed_official 181:a4cbdfbbd2f4 285 }
mbed_official 181:a4cbdfbbd2f4 286
mbed_official 181:a4cbdfbbd2f4 287 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 288
mbed_official 181:a4cbdfbbd2f4 289 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 290 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 291 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 292
mbed_official 181:a4cbdfbbd2f4 293 // disable
mbed_official 202:bd6461c07541 294 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 295 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 296 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 297 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 298 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 299 // Set new address
mbed_official 181:a4cbdfbbd2f4 300 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 301 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 302 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 303 // enable
mbed_official 181:a4cbdfbbd2f4 304 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 305 }
mbed_official 181:a4cbdfbbd2f4 306
mbed_official 181:a4cbdfbbd2f4 307 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 308
mbed_official 181:a4cbdfbbd2f4 309 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 310 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 311
mbed_official 181:a4cbdfbbd2f4 312 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 313 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 314
mbed_official 181:a4cbdfbbd2f4 315 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 316 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 317 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 318 } else {
mbed_official 202:bd6461c07541 319 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 320 }
mbed_official 181:a4cbdfbbd2f4 321
mbed_official 181:a4cbdfbbd2f4 322 // Set new mode
mbed_official 181:a4cbdfbbd2f4 323 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 324
mbed_official 181:a4cbdfbbd2f4 325 }
mbed_official 181:a4cbdfbbd2f4 326
mbed_official 181:a4cbdfbbd2f4 327 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 328 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 329 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 330 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 331 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 332
mbed_official 181:a4cbdfbbd2f4 333 int i2c_slave_receive(i2c_t *obj) {
mbed_official 202:bd6461c07541 334 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 335 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 336
mbed_official 181:a4cbdfbbd2f4 337 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 338 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 339 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 340 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 341 else
mbed_official 181:a4cbdfbbd2f4 342 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 343 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 344 }
mbed_official 181:a4cbdfbbd2f4 345 }
mbed_official 181:a4cbdfbbd2f4 346
mbed_official 181:a4cbdfbbd2f4 347 return (retValue);
mbed_official 181:a4cbdfbbd2f4 348 }
mbed_official 181:a4cbdfbbd2f4 349
mbed_official 181:a4cbdfbbd2f4 350 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 202:bd6461c07541 351 char size = 0;
mbed_official 211:fb8edfff6ae1 352
mbed_official 202:bd6461c07541 353 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 354
mbed_official 202:bd6461c07541 355 return size;
mbed_official 181:a4cbdfbbd2f4 356 }
mbed_official 181:a4cbdfbbd2f4 357
mbed_official 181:a4cbdfbbd2f4 358 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 359 char size = 0;
mbed_official 202:bd6461c07541 360 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 361
mbed_official 181:a4cbdfbbd2f4 362 do {
mbed_official 181:a4cbdfbbd2f4 363 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 364 size++;
mbed_official 181:a4cbdfbbd2f4 365 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 366
mbed_official 181:a4cbdfbbd2f4 367 return size;
mbed_official 181:a4cbdfbbd2f4 368 }
mbed_official 181:a4cbdfbbd2f4 369
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 372
mbed_official 181:a4cbdfbbd2f4 373 #endif // DEVICE_I2C