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targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c@247:135e3186a638, 2014-07-01 (annotated)
- Committer:
- mbed_official
- Date:
- Tue Jul 01 15:00:09 2014 +0100
- Revision:
- 247:135e3186a638
- Parent:
- 227:7bd0639b8911
- Child:
- 305:1f0269907d8b
Synchronized with git revision 4f86d397190b9d18f22b4a189573d65b970f3662
Full URL: https://github.com/mbedmicro/mbed/commit/4f86d397190b9d18f22b4a189573d65b970f3662/
[NUCLEOs] enhance I2C API to make it work with EEPROM
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 56:99eb381a3269 | 1 | /* mbed Microcontroller Library |
mbed_official | 70:c1fbde68b492 | 2 | ******************************************************************************* |
mbed_official | 70:c1fbde68b492 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 70:c1fbde68b492 | 4 | * All rights reserved. |
mbed_official | 56:99eb381a3269 | 5 | * |
mbed_official | 70:c1fbde68b492 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 70:c1fbde68b492 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 56:99eb381a3269 | 8 | * |
mbed_official | 70:c1fbde68b492 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 70:c1fbde68b492 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 70:c1fbde68b492 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 70:c1fbde68b492 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 70:c1fbde68b492 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 70:c1fbde68b492 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 70:c1fbde68b492 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 70:c1fbde68b492 | 16 | * without specific prior written permission. |
mbed_official | 56:99eb381a3269 | 17 | * |
mbed_official | 70:c1fbde68b492 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 70:c1fbde68b492 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 70:c1fbde68b492 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 70:c1fbde68b492 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 70:c1fbde68b492 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 70:c1fbde68b492 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 70:c1fbde68b492 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 70:c1fbde68b492 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 70:c1fbde68b492 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 70:c1fbde68b492 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 70:c1fbde68b492 | 28 | ******************************************************************************* |
mbed_official | 56:99eb381a3269 | 29 | */ |
mbed_official | 227:7bd0639b8911 | 30 | #include "mbed_assert.h" |
mbed_official | 56:99eb381a3269 | 31 | #include "i2c_api.h" |
mbed_official | 56:99eb381a3269 | 32 | |
mbed_official | 56:99eb381a3269 | 33 | #if DEVICE_I2C |
mbed_official | 56:99eb381a3269 | 34 | |
mbed_official | 56:99eb381a3269 | 35 | #include "cmsis.h" |
mbed_official | 56:99eb381a3269 | 36 | #include "pinmap.h" |
mbed_official | 56:99eb381a3269 | 37 | |
mbed_official | 56:99eb381a3269 | 38 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 174:8bb9f3a33240 | 39 | not based on accurate values, they just guarantee that the application will |
mbed_official | 174:8bb9f3a33240 | 40 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 56:99eb381a3269 | 41 | #define FLAG_TIMEOUT ((int)0x1000) |
mbed_official | 56:99eb381a3269 | 42 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 56:99eb381a3269 | 43 | |
mbed_official | 56:99eb381a3269 | 44 | static const PinMap PinMap_I2C_SDA[] = { |
mbed_official | 167:d5744491c362 | 45 | {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, |
mbed_official | 167:d5744491c362 | 46 | {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 2)}, // GPIO_Remap_I2C1 |
mbed_official | 167:d5744491c362 | 47 | {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, |
mbed_official | 56:99eb381a3269 | 48 | {NC, NC, 0} |
mbed_official | 56:99eb381a3269 | 49 | }; |
mbed_official | 56:99eb381a3269 | 50 | |
mbed_official | 56:99eb381a3269 | 51 | static const PinMap PinMap_I2C_SCL[] = { |
mbed_official | 167:d5744491c362 | 52 | {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, |
mbed_official | 167:d5744491c362 | 53 | {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 2)}, // GPIO_Remap_I2C1 |
mbed_official | 167:d5744491c362 | 54 | {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, |
mbed_official | 56:99eb381a3269 | 55 | {NC, NC, 0} |
mbed_official | 56:99eb381a3269 | 56 | }; |
mbed_official | 56:99eb381a3269 | 57 | |
mbed_official | 174:8bb9f3a33240 | 58 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
mbed_official | 56:99eb381a3269 | 59 | // Determine the I2C to use |
mbed_official | 56:99eb381a3269 | 60 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 56:99eb381a3269 | 61 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 56:99eb381a3269 | 62 | |
mbed_official | 56:99eb381a3269 | 63 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 227:7bd0639b8911 | 64 | MBED_ASSERT(obj->i2c != (I2CName)NC); |
mbed_official | 56:99eb381a3269 | 65 | |
mbed_official | 56:99eb381a3269 | 66 | // Enable I2C clock |
mbed_official | 174:8bb9f3a33240 | 67 | if (obj->i2c == I2C_1) { |
mbed_official | 56:99eb381a3269 | 68 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); |
mbed_official | 56:99eb381a3269 | 69 | } |
mbed_official | 56:99eb381a3269 | 70 | if (obj->i2c == I2C_2) { |
mbed_official | 56:99eb381a3269 | 71 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE); |
mbed_official | 56:99eb381a3269 | 72 | } |
mbed_official | 56:99eb381a3269 | 73 | |
mbed_official | 56:99eb381a3269 | 74 | // Configure I2C pins |
mbed_official | 80:66393a7b209d | 75 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 80:66393a7b209d | 76 | pin_mode(scl, OpenDrain); |
mbed_official | 56:99eb381a3269 | 77 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 56:99eb381a3269 | 78 | pin_mode(sda, OpenDrain); |
mbed_official | 174:8bb9f3a33240 | 79 | |
mbed_official | 56:99eb381a3269 | 80 | // Reset to clear pending flags if any |
mbed_official | 56:99eb381a3269 | 81 | i2c_reset(obj); |
mbed_official | 174:8bb9f3a33240 | 82 | |
mbed_official | 56:99eb381a3269 | 83 | // I2C configuration |
mbed_official | 174:8bb9f3a33240 | 84 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 56:99eb381a3269 | 85 | } |
mbed_official | 56:99eb381a3269 | 86 | |
mbed_official | 56:99eb381a3269 | 87 | void i2c_frequency(i2c_t *obj, int hz) { |
mbed_official | 56:99eb381a3269 | 88 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 89 | I2C_InitTypeDef I2C_InitStructure; |
mbed_official | 174:8bb9f3a33240 | 90 | |
mbed_official | 56:99eb381a3269 | 91 | if ((hz != 0) && (hz <= 400000)) { |
mbed_official | 80:66393a7b209d | 92 | I2C_DeInit(i2c); |
mbed_official | 174:8bb9f3a33240 | 93 | |
mbed_official | 56:99eb381a3269 | 94 | // I2C configuration |
mbed_official | 167:d5744491c362 | 95 | I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; |
mbed_official | 167:d5744491c362 | 96 | I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; |
mbed_official | 167:d5744491c362 | 97 | I2C_InitStructure.I2C_OwnAddress1 = 0; |
mbed_official | 167:d5744491c362 | 98 | I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; |
mbed_official | 56:99eb381a3269 | 99 | I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; |
mbed_official | 167:d5744491c362 | 100 | I2C_InitStructure.I2C_ClockSpeed = hz; |
mbed_official | 80:66393a7b209d | 101 | I2C_Init(i2c, &I2C_InitStructure); |
mbed_official | 174:8bb9f3a33240 | 102 | |
mbed_official | 56:99eb381a3269 | 103 | I2C_Cmd(i2c, ENABLE); |
mbed_official | 56:99eb381a3269 | 104 | } |
mbed_official | 56:99eb381a3269 | 105 | } |
mbed_official | 56:99eb381a3269 | 106 | |
mbed_official | 56:99eb381a3269 | 107 | inline int i2c_start(i2c_t *obj) { |
mbed_official | 56:99eb381a3269 | 108 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 109 | int timeout; |
mbed_official | 174:8bb9f3a33240 | 110 | |
mbed_official | 56:99eb381a3269 | 111 | I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag |
mbed_official | 174:8bb9f3a33240 | 112 | |
mbed_official | 56:99eb381a3269 | 113 | // Generate the START condition |
mbed_official | 174:8bb9f3a33240 | 114 | I2C_GenerateSTART(i2c, ENABLE); |
mbed_official | 174:8bb9f3a33240 | 115 | |
mbed_official | 56:99eb381a3269 | 116 | // Wait the START condition has been correctly sent |
mbed_official | 56:99eb381a3269 | 117 | timeout = FLAG_TIMEOUT; |
mbed_official | 56:99eb381a3269 | 118 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) { |
mbed_official | 80:66393a7b209d | 119 | timeout--; |
mbed_official | 80:66393a7b209d | 120 | if (timeout == 0) { |
mbed_official | 80:66393a7b209d | 121 | return 1; |
mbed_official | 80:66393a7b209d | 122 | } |
mbed_official | 56:99eb381a3269 | 123 | } |
mbed_official | 174:8bb9f3a33240 | 124 | |
mbed_official | 58:3b55b7a41411 | 125 | return 0; |
mbed_official | 56:99eb381a3269 | 126 | } |
mbed_official | 56:99eb381a3269 | 127 | |
mbed_official | 56:99eb381a3269 | 128 | inline int i2c_stop(i2c_t *obj) { |
mbed_official | 56:99eb381a3269 | 129 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 174:8bb9f3a33240 | 130 | |
mbed_official | 56:99eb381a3269 | 131 | I2C_GenerateSTOP(i2c, ENABLE); |
mbed_official | 174:8bb9f3a33240 | 132 | |
mbed_official | 58:3b55b7a41411 | 133 | return 0; |
mbed_official | 56:99eb381a3269 | 134 | } |
mbed_official | 56:99eb381a3269 | 135 | |
mbed_official | 56:99eb381a3269 | 136 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
mbed_official | 56:99eb381a3269 | 137 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 138 | int timeout; |
mbed_official | 56:99eb381a3269 | 139 | int count; |
mbed_official | 56:99eb381a3269 | 140 | int value; |
mbed_official | 174:8bb9f3a33240 | 141 | |
mbed_official | 56:99eb381a3269 | 142 | i2c_start(obj); |
mbed_official | 56:99eb381a3269 | 143 | |
mbed_official | 56:99eb381a3269 | 144 | // Send slave address for read |
mbed_official | 174:8bb9f3a33240 | 145 | I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver); |
mbed_official | 56:99eb381a3269 | 146 | |
mbed_official | 56:99eb381a3269 | 147 | // Wait address is acknowledged |
mbed_official | 56:99eb381a3269 | 148 | timeout = FLAG_TIMEOUT; |
mbed_official | 56:99eb381a3269 | 149 | while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) { |
mbed_official | 80:66393a7b209d | 150 | timeout--; |
mbed_official | 80:66393a7b209d | 151 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 152 | return -1; |
mbed_official | 80:66393a7b209d | 153 | } |
mbed_official | 56:99eb381a3269 | 154 | } |
mbed_official | 174:8bb9f3a33240 | 155 | |
mbed_official | 56:99eb381a3269 | 156 | // Read all bytes except last one |
mbed_official | 56:99eb381a3269 | 157 | for (count = 0; count < (length - 1); count++) { |
mbed_official | 56:99eb381a3269 | 158 | value = i2c_byte_read(obj, 0); |
mbed_official | 56:99eb381a3269 | 159 | data[count] = (char)value; |
mbed_official | 56:99eb381a3269 | 160 | } |
mbed_official | 174:8bb9f3a33240 | 161 | |
mbed_official | 56:99eb381a3269 | 162 | // If not repeated start, send stop. |
mbed_official | 56:99eb381a3269 | 163 | // Warning: must be done BEFORE the data is read. |
mbed_official | 56:99eb381a3269 | 164 | if (stop) { |
mbed_official | 56:99eb381a3269 | 165 | i2c_stop(obj); |
mbed_official | 56:99eb381a3269 | 166 | } |
mbed_official | 56:99eb381a3269 | 167 | |
mbed_official | 56:99eb381a3269 | 168 | // Read the last byte |
mbed_official | 56:99eb381a3269 | 169 | value = i2c_byte_read(obj, 1); |
mbed_official | 56:99eb381a3269 | 170 | data[count] = (char)value; |
mbed_official | 174:8bb9f3a33240 | 171 | |
mbed_official | 56:99eb381a3269 | 172 | return length; |
mbed_official | 56:99eb381a3269 | 173 | } |
mbed_official | 56:99eb381a3269 | 174 | |
mbed_official | 56:99eb381a3269 | 175 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
mbed_official | 56:99eb381a3269 | 176 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 177 | int timeout; |
mbed_official | 56:99eb381a3269 | 178 | int count; |
mbed_official | 208:4557f4bb2dd5 | 179 | |
mbed_official | 56:99eb381a3269 | 180 | i2c_start(obj); |
mbed_official | 56:99eb381a3269 | 181 | |
mbed_official | 56:99eb381a3269 | 182 | // Send slave address for write |
mbed_official | 56:99eb381a3269 | 183 | I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter); |
mbed_official | 174:8bb9f3a33240 | 184 | |
mbed_official | 56:99eb381a3269 | 185 | // Wait address is acknowledged |
mbed_official | 56:99eb381a3269 | 186 | timeout = FLAG_TIMEOUT; |
mbed_official | 56:99eb381a3269 | 187 | while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) { |
mbed_official | 80:66393a7b209d | 188 | timeout--; |
mbed_official | 80:66393a7b209d | 189 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 190 | return -1; |
mbed_official | 80:66393a7b209d | 191 | } |
mbed_official | 56:99eb381a3269 | 192 | } |
mbed_official | 56:99eb381a3269 | 193 | |
mbed_official | 56:99eb381a3269 | 194 | for (count = 0; count < length; count++) { |
mbed_official | 58:3b55b7a41411 | 195 | if (i2c_byte_write(obj, data[count]) != 1) { |
mbed_official | 58:3b55b7a41411 | 196 | i2c_stop(obj); |
mbed_official | 58:3b55b7a41411 | 197 | return 0; |
mbed_official | 56:99eb381a3269 | 198 | } |
mbed_official | 56:99eb381a3269 | 199 | } |
mbed_official | 56:99eb381a3269 | 200 | |
mbed_official | 56:99eb381a3269 | 201 | // If not repeated start, send stop. |
mbed_official | 56:99eb381a3269 | 202 | if (stop) { |
mbed_official | 56:99eb381a3269 | 203 | i2c_stop(obj); |
mbed_official | 56:99eb381a3269 | 204 | } |
mbed_official | 56:99eb381a3269 | 205 | |
mbed_official | 56:99eb381a3269 | 206 | return count; |
mbed_official | 56:99eb381a3269 | 207 | } |
mbed_official | 56:99eb381a3269 | 208 | |
mbed_official | 56:99eb381a3269 | 209 | int i2c_byte_read(i2c_t *obj, int last) { |
mbed_official | 56:99eb381a3269 | 210 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 211 | uint8_t data; |
mbed_official | 56:99eb381a3269 | 212 | int timeout; |
mbed_official | 174:8bb9f3a33240 | 213 | |
mbed_official | 56:99eb381a3269 | 214 | if (last) { |
mbed_official | 56:99eb381a3269 | 215 | // Don't acknowledge the last byte |
mbed_official | 56:99eb381a3269 | 216 | I2C_AcknowledgeConfig(i2c, DISABLE); |
mbed_official | 56:99eb381a3269 | 217 | } else { |
mbed_official | 56:99eb381a3269 | 218 | // Acknowledge the byte |
mbed_official | 56:99eb381a3269 | 219 | I2C_AcknowledgeConfig(i2c, ENABLE); |
mbed_official | 56:99eb381a3269 | 220 | } |
mbed_official | 56:99eb381a3269 | 221 | |
mbed_official | 56:99eb381a3269 | 222 | // Wait until the byte is received |
mbed_official | 56:99eb381a3269 | 223 | timeout = FLAG_TIMEOUT; |
mbed_official | 56:99eb381a3269 | 224 | while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 80:66393a7b209d | 225 | timeout--; |
mbed_official | 80:66393a7b209d | 226 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 227 | return -1; |
mbed_official | 80:66393a7b209d | 228 | } |
mbed_official | 56:99eb381a3269 | 229 | } |
mbed_official | 56:99eb381a3269 | 230 | |
mbed_official | 56:99eb381a3269 | 231 | data = I2C_ReceiveData(i2c); |
mbed_official | 174:8bb9f3a33240 | 232 | |
mbed_official | 56:99eb381a3269 | 233 | return (int)data; |
mbed_official | 56:99eb381a3269 | 234 | } |
mbed_official | 56:99eb381a3269 | 235 | |
mbed_official | 56:99eb381a3269 | 236 | int i2c_byte_write(i2c_t *obj, int data) { |
mbed_official | 56:99eb381a3269 | 237 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 238 | int timeout; |
mbed_official | 56:99eb381a3269 | 239 | |
mbed_official | 56:99eb381a3269 | 240 | I2C_SendData(i2c, (uint8_t)data); |
mbed_official | 56:99eb381a3269 | 241 | |
mbed_official | 56:99eb381a3269 | 242 | // Wait until the byte is transmitted |
mbed_official | 208:4557f4bb2dd5 | 243 | timeout = FLAG_TIMEOUT; |
mbed_official | 56:99eb381a3269 | 244 | while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) && |
mbed_official | 174:8bb9f3a33240 | 245 | (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) { |
mbed_official | 80:66393a7b209d | 246 | timeout--; |
mbed_official | 80:66393a7b209d | 247 | if (timeout == 0) { |
mbed_official | 58:3b55b7a41411 | 248 | return 0; |
mbed_official | 56:99eb381a3269 | 249 | } |
mbed_official | 56:99eb381a3269 | 250 | } |
mbed_official | 174:8bb9f3a33240 | 251 | |
mbed_official | 58:3b55b7a41411 | 252 | return 1; |
mbed_official | 56:99eb381a3269 | 253 | } |
mbed_official | 56:99eb381a3269 | 254 | |
mbed_official | 56:99eb381a3269 | 255 | void i2c_reset(i2c_t *obj) { |
mbed_official | 174:8bb9f3a33240 | 256 | if (obj->i2c == I2C_1) { |
mbed_official | 56:99eb381a3269 | 257 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE); |
mbed_official | 56:99eb381a3269 | 258 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE); |
mbed_official | 56:99eb381a3269 | 259 | } |
mbed_official | 56:99eb381a3269 | 260 | if (obj->i2c == I2C_2) { |
mbed_official | 56:99eb381a3269 | 261 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE); |
mbed_official | 174:8bb9f3a33240 | 262 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE); |
mbed_official | 56:99eb381a3269 | 263 | } |
mbed_official | 56:99eb381a3269 | 264 | } |
mbed_official | 56:99eb381a3269 | 265 | |
mbed_official | 56:99eb381a3269 | 266 | #if DEVICE_I2CSLAVE |
mbed_official | 56:99eb381a3269 | 267 | |
mbed_official | 56:99eb381a3269 | 268 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
mbed_official | 56:99eb381a3269 | 269 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 56:99eb381a3269 | 270 | uint16_t tmpreg; |
mbed_official | 174:8bb9f3a33240 | 271 | |
mbed_official | 56:99eb381a3269 | 272 | // Get the old register value |
mbed_official | 56:99eb381a3269 | 273 | tmpreg = i2c->OAR1; |
mbed_official | 56:99eb381a3269 | 274 | // Reset address bits |
mbed_official | 56:99eb381a3269 | 275 | tmpreg &= 0xFC00; |
mbed_official | 56:99eb381a3269 | 276 | // Set new address |
mbed_official | 56:99eb381a3269 | 277 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 56:99eb381a3269 | 278 | // Store the new register value |
mbed_official | 56:99eb381a3269 | 279 | i2c->OAR1 = tmpreg; |
mbed_official | 56:99eb381a3269 | 280 | } |
mbed_official | 56:99eb381a3269 | 281 | |
mbed_official | 56:99eb381a3269 | 282 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
mbed_official | 56:99eb381a3269 | 283 | // Nothing to do |
mbed_official | 56:99eb381a3269 | 284 | } |
mbed_official | 56:99eb381a3269 | 285 | |
mbed_official | 58:3b55b7a41411 | 286 | // See I2CSlave.h |
mbed_official | 58:3b55b7a41411 | 287 | #define NoData 0 // the slave has not been addressed |
mbed_official | 58:3b55b7a41411 | 288 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 58:3b55b7a41411 | 289 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 58:3b55b7a41411 | 290 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 56:99eb381a3269 | 291 | |
mbed_official | 56:99eb381a3269 | 292 | int i2c_slave_receive(i2c_t *obj) { |
mbed_official | 181:a4cbdfbbd2f4 | 293 | int retValue = NoData; |
mbed_official | 181:a4cbdfbbd2f4 | 294 | uint32_t event; |
mbed_official | 181:a4cbdfbbd2f4 | 295 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 181:a4cbdfbbd2f4 | 296 | |
mbed_official | 208:4557f4bb2dd5 | 297 | event = I2C_GetLastEvent(i2c); |
mbed_official | 208:4557f4bb2dd5 | 298 | if (event != 0) { |
mbed_official | 208:4557f4bb2dd5 | 299 | switch (event) { |
mbed_official | 181:a4cbdfbbd2f4 | 300 | case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED: |
mbed_official | 181:a4cbdfbbd2f4 | 301 | retValue = WriteAddressed; |
mbed_official | 181:a4cbdfbbd2f4 | 302 | break; |
mbed_official | 181:a4cbdfbbd2f4 | 303 | case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED: |
mbed_official | 181:a4cbdfbbd2f4 | 304 | retValue = ReadAddressed; |
mbed_official | 181:a4cbdfbbd2f4 | 305 | break; |
mbed_official | 181:a4cbdfbbd2f4 | 306 | case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED: |
mbed_official | 181:a4cbdfbbd2f4 | 307 | retValue = WriteGeneral; |
mbed_official | 181:a4cbdfbbd2f4 | 308 | break; |
mbed_official | 181:a4cbdfbbd2f4 | 309 | default: |
mbed_official | 181:a4cbdfbbd2f4 | 310 | retValue = NoData; |
mbed_official | 181:a4cbdfbbd2f4 | 311 | break; |
mbed_official | 181:a4cbdfbbd2f4 | 312 | } |
mbed_official | 181:a4cbdfbbd2f4 | 313 | |
mbed_official | 208:4557f4bb2dd5 | 314 | // clear ADDR |
mbed_official | 208:4557f4bb2dd5 | 315 | if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) { |
mbed_official | 181:a4cbdfbbd2f4 | 316 | // read SR to clear ADDR flag |
mbed_official | 181:a4cbdfbbd2f4 | 317 | i2c->SR1; |
mbed_official | 181:a4cbdfbbd2f4 | 318 | i2c->SR2; |
mbed_official | 181:a4cbdfbbd2f4 | 319 | } |
mbed_official | 181:a4cbdfbbd2f4 | 320 | // clear stopf |
mbed_official | 208:4557f4bb2dd5 | 321 | if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) { |
mbed_official | 181:a4cbdfbbd2f4 | 322 | // read SR1 and write CR1 to clear STOP flag |
mbed_official | 181:a4cbdfbbd2f4 | 323 | i2c->SR1; |
mbed_official | 208:4557f4bb2dd5 | 324 | I2C_Cmd(i2c, ENABLE); |
mbed_official | 181:a4cbdfbbd2f4 | 325 | } |
mbed_official | 181:a4cbdfbbd2f4 | 326 | // clear AF |
mbed_official | 208:4557f4bb2dd5 | 327 | if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) { |
mbed_official | 181:a4cbdfbbd2f4 | 328 | I2C_ClearFlag(i2c, I2C_FLAG_AF); |
mbed_official | 208:4557f4bb2dd5 | 329 | } |
mbed_official | 181:a4cbdfbbd2f4 | 330 | } |
mbed_official | 208:4557f4bb2dd5 | 331 | return (retValue); |
mbed_official | 56:99eb381a3269 | 332 | } |
mbed_official | 56:99eb381a3269 | 333 | |
mbed_official | 56:99eb381a3269 | 334 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
mbed_official | 58:3b55b7a41411 | 335 | int count = 0; |
mbed_official | 174:8bb9f3a33240 | 336 | |
mbed_official | 58:3b55b7a41411 | 337 | // Read all bytes |
mbed_official | 58:3b55b7a41411 | 338 | for (count = 0; count < length; count++) { |
mbed_official | 58:3b55b7a41411 | 339 | data[count] = i2c_byte_read(obj, 0); |
mbed_official | 58:3b55b7a41411 | 340 | } |
mbed_official | 174:8bb9f3a33240 | 341 | |
mbed_official | 58:3b55b7a41411 | 342 | return count; |
mbed_official | 56:99eb381a3269 | 343 | } |
mbed_official | 56:99eb381a3269 | 344 | |
mbed_official | 56:99eb381a3269 | 345 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
mbed_official | 58:3b55b7a41411 | 346 | int count = 0; |
mbed_official | 174:8bb9f3a33240 | 347 | |
mbed_official | 58:3b55b7a41411 | 348 | // Write all bytes |
mbed_official | 58:3b55b7a41411 | 349 | for (count = 0; count < length; count++) { |
mbed_official | 58:3b55b7a41411 | 350 | i2c_byte_write(obj, data[count]); |
mbed_official | 58:3b55b7a41411 | 351 | } |
mbed_official | 174:8bb9f3a33240 | 352 | |
mbed_official | 58:3b55b7a41411 | 353 | return count; |
mbed_official | 56:99eb381a3269 | 354 | } |
mbed_official | 56:99eb381a3269 | 355 | |
mbed_official | 56:99eb381a3269 | 356 | |
mbed_official | 56:99eb381a3269 | 357 | #endif // DEVICE_I2CSLAVE |
mbed_official | 56:99eb381a3269 | 358 | |
mbed_official | 56:99eb381a3269 | 359 | #endif // DEVICE_I2C |