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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F091RC/i2c_api.c@340:28d1f895c6fe, 2014-10-09 (annotated)

Committer:
mbed_official
Date:
Thu Oct 09 08:15:07 2014 +0100
Revision:
340:28d1f895c6fe
Child:
414:4ec4c5b614b0
Synchronized with git revision b5a4c8e80393336b2656fb29ab46d405d3068602



Full URL: https://github.com/mbedmicro/mbed/commit/b5a4c8e80393336b2656fb29ab46d405d3068602/



HAL: nrf51822 - Few fixes for PWM and Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 340:28d1f895c6fe 1 /* mbed Microcontroller Library
mbed_official 340:28d1f895c6fe 2 *******************************************************************************
mbed_official 340:28d1f895c6fe 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 340:28d1f895c6fe 4 * All rights reserved.
mbed_official 340:28d1f895c6fe 5 *
mbed_official 340:28d1f895c6fe 6 * Redistribution and use in source and binary forms, with or without
mbed_official 340:28d1f895c6fe 7 * modification, are permitted provided that the following conditions are met:
mbed_official 340:28d1f895c6fe 8 *
mbed_official 340:28d1f895c6fe 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 340:28d1f895c6fe 10 * this list of conditions and the following disclaimer.
mbed_official 340:28d1f895c6fe 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 340:28d1f895c6fe 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 340:28d1f895c6fe 13 * and/or other materials provided with the distribution.
mbed_official 340:28d1f895c6fe 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 340:28d1f895c6fe 15 * may be used to endorse or promote products derived from this software
mbed_official 340:28d1f895c6fe 16 * without specific prior written permission.
mbed_official 340:28d1f895c6fe 17 *
mbed_official 340:28d1f895c6fe 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 340:28d1f895c6fe 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 340:28d1f895c6fe 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 340:28d1f895c6fe 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 340:28d1f895c6fe 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 340:28d1f895c6fe 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 340:28d1f895c6fe 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 340:28d1f895c6fe 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 340:28d1f895c6fe 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 340:28d1f895c6fe 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 340:28d1f895c6fe 28 *******************************************************************************
mbed_official 340:28d1f895c6fe 29 */
mbed_official 340:28d1f895c6fe 30 #include "mbed_assert.h"
mbed_official 340:28d1f895c6fe 31 #include "i2c_api.h"
mbed_official 340:28d1f895c6fe 32
mbed_official 340:28d1f895c6fe 33 #if DEVICE_I2C
mbed_official 340:28d1f895c6fe 34
mbed_official 340:28d1f895c6fe 35 #include "cmsis.h"
mbed_official 340:28d1f895c6fe 36 #include "pinmap.h"
mbed_official 340:28d1f895c6fe 37
mbed_official 340:28d1f895c6fe 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 340:28d1f895c6fe 39 not based on accurate values, they just guarantee that the application will
mbed_official 340:28d1f895c6fe 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 340:28d1f895c6fe 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 340:28d1f895c6fe 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 340:28d1f895c6fe 43
mbed_official 340:28d1f895c6fe 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 340:28d1f895c6fe 45 {PA_10, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 340:28d1f895c6fe 46 {PA_12, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 340:28d1f895c6fe 47 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 48 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 49 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 340:28d1f895c6fe 50 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 340:28d1f895c6fe 51 // {PF_0, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)}, // OSC_IN
mbed_official 340:28d1f895c6fe 52 {NC, NC, 0}
mbed_official 340:28d1f895c6fe 53 };
mbed_official 340:28d1f895c6fe 54
mbed_official 340:28d1f895c6fe 55 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 340:28d1f895c6fe 56 {PA_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 340:28d1f895c6fe 57 {PA_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 340:28d1f895c6fe 58 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 59 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 340:28d1f895c6fe 60 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 340:28d1f895c6fe 61 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 340:28d1f895c6fe 62 // {PF_1, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)}, // OSC_OUT
mbed_official 340:28d1f895c6fe 63 {NC, NC, 0}
mbed_official 340:28d1f895c6fe 64 };
mbed_official 340:28d1f895c6fe 65
mbed_official 340:28d1f895c6fe 66 I2C_HandleTypeDef I2cHandle;
mbed_official 340:28d1f895c6fe 67
mbed_official 340:28d1f895c6fe 68 int i2c1_inited = 0;
mbed_official 340:28d1f895c6fe 69 int i2c2_inited = 0;
mbed_official 340:28d1f895c6fe 70
mbed_official 340:28d1f895c6fe 71 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 340:28d1f895c6fe 72 {
mbed_official 340:28d1f895c6fe 73 // Determine the I2C to use
mbed_official 340:28d1f895c6fe 74 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 75 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 76
mbed_official 340:28d1f895c6fe 77 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 340:28d1f895c6fe 78 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 340:28d1f895c6fe 79
mbed_official 340:28d1f895c6fe 80 // Enable I2C1 clock and pinout if not done
mbed_official 340:28d1f895c6fe 81 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 340:28d1f895c6fe 82 i2c1_inited = 1;
mbed_official 340:28d1f895c6fe 83 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 340:28d1f895c6fe 84 __I2C1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 85 // Configure I2C pins
mbed_official 340:28d1f895c6fe 86 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 88 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 89 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 90 }
mbed_official 340:28d1f895c6fe 91
mbed_official 340:28d1f895c6fe 92 // Enable I2C2 clock and pinout if not done
mbed_official 340:28d1f895c6fe 93 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 340:28d1f895c6fe 94 i2c2_inited = 1;
mbed_official 340:28d1f895c6fe 95 __I2C2_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 96 // Configure I2C pins
mbed_official 340:28d1f895c6fe 97 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 98 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 99 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 100 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 101 }
mbed_official 340:28d1f895c6fe 102
mbed_official 340:28d1f895c6fe 103 // Reset to clear pending flags if any
mbed_official 340:28d1f895c6fe 104 i2c_reset(obj);
mbed_official 340:28d1f895c6fe 105
mbed_official 340:28d1f895c6fe 106 // I2C configuration
mbed_official 340:28d1f895c6fe 107 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 340:28d1f895c6fe 108 }
mbed_official 340:28d1f895c6fe 109
mbed_official 340:28d1f895c6fe 110 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 340:28d1f895c6fe 111 {
mbed_official 340:28d1f895c6fe 112 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 340:28d1f895c6fe 113 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 114 int timeout;
mbed_official 340:28d1f895c6fe 115
mbed_official 340:28d1f895c6fe 116 // wait before init
mbed_official 340:28d1f895c6fe 117 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 118 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 119
mbed_official 340:28d1f895c6fe 120 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 340:28d1f895c6fe 121 switch (hz) {
mbed_official 340:28d1f895c6fe 122 case 100000:
mbed_official 340:28d1f895c6fe 123 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 124 break;
mbed_official 340:28d1f895c6fe 125 case 400000:
mbed_official 340:28d1f895c6fe 126 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 127 break;
mbed_official 340:28d1f895c6fe 128 case 1000000:
mbed_official 340:28d1f895c6fe 129 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 130 break;
mbed_official 340:28d1f895c6fe 131 default:
mbed_official 340:28d1f895c6fe 132 break;
mbed_official 340:28d1f895c6fe 133 }
mbed_official 340:28d1f895c6fe 134
mbed_official 340:28d1f895c6fe 135 // I2C configuration
mbed_official 340:28d1f895c6fe 136 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 340:28d1f895c6fe 137 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 340:28d1f895c6fe 138 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 340:28d1f895c6fe 139 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 340:28d1f895c6fe 140 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 340:28d1f895c6fe 141 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 340:28d1f895c6fe 142 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 340:28d1f895c6fe 143 HAL_I2C_Init(&I2cHandle);
mbed_official 340:28d1f895c6fe 144 }
mbed_official 340:28d1f895c6fe 145
mbed_official 340:28d1f895c6fe 146 inline int i2c_start(i2c_t *obj)
mbed_official 340:28d1f895c6fe 147 {
mbed_official 340:28d1f895c6fe 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 149 int timeout;
mbed_official 340:28d1f895c6fe 150
mbed_official 340:28d1f895c6fe 151 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 152
mbed_official 340:28d1f895c6fe 153 // Clear Acknowledge failure flag
mbed_official 340:28d1f895c6fe 154 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 155
mbed_official 340:28d1f895c6fe 156 // Generate the START condition
mbed_official 340:28d1f895c6fe 157 i2c->CR2 |= I2C_CR2_START;
mbed_official 340:28d1f895c6fe 158
mbed_official 340:28d1f895c6fe 159 // Wait the START condition has been correctly sent
mbed_official 340:28d1f895c6fe 160 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 161 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 340:28d1f895c6fe 162 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 163 return 1;
mbed_official 340:28d1f895c6fe 164 }
mbed_official 340:28d1f895c6fe 165 }
mbed_official 340:28d1f895c6fe 166
mbed_official 340:28d1f895c6fe 167 return 0;
mbed_official 340:28d1f895c6fe 168 }
mbed_official 340:28d1f895c6fe 169
mbed_official 340:28d1f895c6fe 170 inline int i2c_stop(i2c_t *obj)
mbed_official 340:28d1f895c6fe 171 {
mbed_official 340:28d1f895c6fe 172 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 173
mbed_official 340:28d1f895c6fe 174 // Generate the STOP condition
mbed_official 340:28d1f895c6fe 175 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 340:28d1f895c6fe 176
mbed_official 340:28d1f895c6fe 177 return 0;
mbed_official 340:28d1f895c6fe 178 }
mbed_official 340:28d1f895c6fe 179
mbed_official 340:28d1f895c6fe 180 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 340:28d1f895c6fe 181 {
mbed_official 340:28d1f895c6fe 182 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 183 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 184 int timeout;
mbed_official 340:28d1f895c6fe 185 int count;
mbed_official 340:28d1f895c6fe 186 int value;
mbed_official 340:28d1f895c6fe 187
mbed_official 340:28d1f895c6fe 188 // Update CR2 register
mbed_official 340:28d1f895c6fe 189 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 190 | (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 340:28d1f895c6fe 191
mbed_official 340:28d1f895c6fe 192 // Read all bytes
mbed_official 340:28d1f895c6fe 193 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 194 value = i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 195 data[count] = (char)value;
mbed_official 340:28d1f895c6fe 196 }
mbed_official 340:28d1f895c6fe 197
mbed_official 340:28d1f895c6fe 198 // Wait transfer complete
mbed_official 340:28d1f895c6fe 199 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 200 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 201 timeout--;
mbed_official 340:28d1f895c6fe 202 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 203 return -1;
mbed_official 340:28d1f895c6fe 204 }
mbed_official 340:28d1f895c6fe 205 }
mbed_official 340:28d1f895c6fe 206 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 207
mbed_official 340:28d1f895c6fe 208 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 209 if (stop) {
mbed_official 340:28d1f895c6fe 210 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 211 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 212 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 213 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 214 timeout--;
mbed_official 340:28d1f895c6fe 215 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 216 return -1;
mbed_official 340:28d1f895c6fe 217 }
mbed_official 340:28d1f895c6fe 218 }
mbed_official 340:28d1f895c6fe 219 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 220 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 221 }
mbed_official 340:28d1f895c6fe 222
mbed_official 340:28d1f895c6fe 223 return length;
mbed_official 340:28d1f895c6fe 224 }
mbed_official 340:28d1f895c6fe 225
mbed_official 340:28d1f895c6fe 226 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 340:28d1f895c6fe 227 {
mbed_official 340:28d1f895c6fe 228 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 229 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 230 int timeout;
mbed_official 340:28d1f895c6fe 231 int count;
mbed_official 340:28d1f895c6fe 232
mbed_official 340:28d1f895c6fe 233 // Update CR2 register
mbed_official 340:28d1f895c6fe 234 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 235 | (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 340:28d1f895c6fe 236
mbed_official 340:28d1f895c6fe 237 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 238 i2c_byte_write(obj, data[count]);
mbed_official 340:28d1f895c6fe 239 }
mbed_official 340:28d1f895c6fe 240
mbed_official 340:28d1f895c6fe 241 // Wait transfer complete
mbed_official 340:28d1f895c6fe 242 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 243 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 244 timeout--;
mbed_official 340:28d1f895c6fe 245 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 246 return -1;
mbed_official 340:28d1f895c6fe 247 }
mbed_official 340:28d1f895c6fe 248 }
mbed_official 340:28d1f895c6fe 249 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 250
mbed_official 340:28d1f895c6fe 251 // If not repeated start, send stop
mbed_official 340:28d1f895c6fe 252 if (stop) {
mbed_official 340:28d1f895c6fe 253 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 254 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 255 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 256 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 257 timeout--;
mbed_official 340:28d1f895c6fe 258 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 259 return -1;
mbed_official 340:28d1f895c6fe 260 }
mbed_official 340:28d1f895c6fe 261 }
mbed_official 340:28d1f895c6fe 262 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 263 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 264 }
mbed_official 340:28d1f895c6fe 265
mbed_official 340:28d1f895c6fe 266 return count;
mbed_official 340:28d1f895c6fe 267 }
mbed_official 340:28d1f895c6fe 268
mbed_official 340:28d1f895c6fe 269 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 340:28d1f895c6fe 270 {
mbed_official 340:28d1f895c6fe 271 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 272 int timeout;
mbed_official 340:28d1f895c6fe 273
mbed_official 340:28d1f895c6fe 274 // Wait until the byte is received
mbed_official 340:28d1f895c6fe 275 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 276 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 277 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 278 return -1;
mbed_official 340:28d1f895c6fe 279 }
mbed_official 340:28d1f895c6fe 280 }
mbed_official 340:28d1f895c6fe 281
mbed_official 340:28d1f895c6fe 282 return (int)i2c->RXDR;
mbed_official 340:28d1f895c6fe 283 }
mbed_official 340:28d1f895c6fe 284
mbed_official 340:28d1f895c6fe 285 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 340:28d1f895c6fe 286 {
mbed_official 340:28d1f895c6fe 287 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 288 int timeout;
mbed_official 340:28d1f895c6fe 289
mbed_official 340:28d1f895c6fe 290 // Wait until the previous byte is transmitted
mbed_official 340:28d1f895c6fe 291 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 292 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 340:28d1f895c6fe 293 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 294 return 0;
mbed_official 340:28d1f895c6fe 295 }
mbed_official 340:28d1f895c6fe 296 }
mbed_official 340:28d1f895c6fe 297
mbed_official 340:28d1f895c6fe 298 i2c->TXDR = (uint8_t)data;
mbed_official 340:28d1f895c6fe 299
mbed_official 340:28d1f895c6fe 300 return 1;
mbed_official 340:28d1f895c6fe 301 }
mbed_official 340:28d1f895c6fe 302
mbed_official 340:28d1f895c6fe 303 void i2c_reset(i2c_t *obj)
mbed_official 340:28d1f895c6fe 304 {
mbed_official 340:28d1f895c6fe 305 int timeout;
mbed_official 340:28d1f895c6fe 306
mbed_official 340:28d1f895c6fe 307 // Wait before reset
mbed_official 340:28d1f895c6fe 308 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 309 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 310
mbed_official 340:28d1f895c6fe 311 if (obj->i2c == I2C_1) {
mbed_official 340:28d1f895c6fe 312 __I2C1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 313 __I2C1_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 314 }
mbed_official 340:28d1f895c6fe 315 if (obj->i2c == I2C_2) {
mbed_official 340:28d1f895c6fe 316 __I2C2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 317 __I2C2_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 318 }
mbed_official 340:28d1f895c6fe 319 }
mbed_official 340:28d1f895c6fe 320
mbed_official 340:28d1f895c6fe 321 #if DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 322
mbed_official 340:28d1f895c6fe 323 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 340:28d1f895c6fe 324 {
mbed_official 340:28d1f895c6fe 325 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 326 uint16_t tmpreg = 0;
mbed_official 340:28d1f895c6fe 327
mbed_official 340:28d1f895c6fe 328 // disable
mbed_official 340:28d1f895c6fe 329 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 330 // Get the old register value
mbed_official 340:28d1f895c6fe 331 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 332 // Reset address bits
mbed_official 340:28d1f895c6fe 333 tmpreg &= 0xFC00;
mbed_official 340:28d1f895c6fe 334 // Set new address
mbed_official 340:28d1f895c6fe 335 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 340:28d1f895c6fe 336 // Store the new register value
mbed_official 340:28d1f895c6fe 337 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 338 // enable
mbed_official 340:28d1f895c6fe 339 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 340 }
mbed_official 340:28d1f895c6fe 341
mbed_official 340:28d1f895c6fe 342 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 340:28d1f895c6fe 343 {
mbed_official 340:28d1f895c6fe 344 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 345 uint16_t tmpreg;
mbed_official 340:28d1f895c6fe 346
mbed_official 340:28d1f895c6fe 347 // Get the old register value
mbed_official 340:28d1f895c6fe 348 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 349
mbed_official 340:28d1f895c6fe 350 // Enable / disable slave
mbed_official 340:28d1f895c6fe 351 if (enable_slave == 1) {
mbed_official 340:28d1f895c6fe 352 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 353 } else {
mbed_official 340:28d1f895c6fe 354 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 355 }
mbed_official 340:28d1f895c6fe 356
mbed_official 340:28d1f895c6fe 357 // Set new mode
mbed_official 340:28d1f895c6fe 358 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 359 }
mbed_official 340:28d1f895c6fe 360
mbed_official 340:28d1f895c6fe 361 // See I2CSlave.h
mbed_official 340:28d1f895c6fe 362 #define NoData 0 // the slave has not been addressed
mbed_official 340:28d1f895c6fe 363 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 340:28d1f895c6fe 364 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 340:28d1f895c6fe 365 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 340:28d1f895c6fe 366
mbed_official 340:28d1f895c6fe 367 int i2c_slave_receive(i2c_t *obj)
mbed_official 340:28d1f895c6fe 368 {
mbed_official 340:28d1f895c6fe 369 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 370 int retValue = NoData;
mbed_official 340:28d1f895c6fe 371
mbed_official 340:28d1f895c6fe 372 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 340:28d1f895c6fe 373 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 340:28d1f895c6fe 374 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 340:28d1f895c6fe 375 retValue = ReadAddressed;
mbed_official 340:28d1f895c6fe 376 else
mbed_official 340:28d1f895c6fe 377 retValue = WriteAddressed;
mbed_official 340:28d1f895c6fe 378
mbed_official 340:28d1f895c6fe 379 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 340:28d1f895c6fe 380 }
mbed_official 340:28d1f895c6fe 381 }
mbed_official 340:28d1f895c6fe 382
mbed_official 340:28d1f895c6fe 383 return (retValue);
mbed_official 340:28d1f895c6fe 384 }
mbed_official 340:28d1f895c6fe 385
mbed_official 340:28d1f895c6fe 386 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 340:28d1f895c6fe 387 {
mbed_official 340:28d1f895c6fe 388 char size = 0;
mbed_official 340:28d1f895c6fe 389
mbed_official 340:28d1f895c6fe 390 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 391
mbed_official 340:28d1f895c6fe 392 return size;
mbed_official 340:28d1f895c6fe 393 }
mbed_official 340:28d1f895c6fe 394
mbed_official 340:28d1f895c6fe 395 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 340:28d1f895c6fe 396 {
mbed_official 340:28d1f895c6fe 397 char size = 0;
mbed_official 340:28d1f895c6fe 398 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 399
mbed_official 340:28d1f895c6fe 400 do {
mbed_official 340:28d1f895c6fe 401 i2c_byte_write(obj, data[size]);
mbed_official 340:28d1f895c6fe 402 size++;
mbed_official 340:28d1f895c6fe 403 } while (size < length);
mbed_official 340:28d1f895c6fe 404
mbed_official 340:28d1f895c6fe 405 return size;
mbed_official 340:28d1f895c6fe 406 }
mbed_official 340:28d1f895c6fe 407
mbed_official 340:28d1f895c6fe 408
mbed_official 340:28d1f895c6fe 409 #endif // DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 410
mbed_official 340:28d1f895c6fe 411 #endif // DEVICE_I2C