mbed library sources
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targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c@183:46ae3190e86c, 2014-05-07 (annotated)
- Committer:
- mbed_official
- Date:
- Wed May 07 17:45:07 2014 +0100
- Revision:
- 183:46ae3190e86c
- Parent:
- 181:a4cbdfbbd2f4
- Child:
- 185:e752b4ee7de1
Synchronized with git revision 152b58673f64d18174038282d90ca97e67d44ae2
Full URL: https://github.com/mbedmicro/mbed/commit/152b58673f64d18174038282d90ca97e67d44ae2/
Ensure the NVIC table gets copied to RAM even when it is not at 0x0000
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 87:085cde657901 | 1 | /* mbed Microcontroller Library |
mbed_official | 87:085cde657901 | 2 | ******************************************************************************* |
mbed_official | 87:085cde657901 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 87:085cde657901 | 4 | * All rights reserved. |
mbed_official | 87:085cde657901 | 5 | * |
mbed_official | 87:085cde657901 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 87:085cde657901 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 87:085cde657901 | 8 | * |
mbed_official | 87:085cde657901 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 87:085cde657901 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 87:085cde657901 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 87:085cde657901 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 87:085cde657901 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 87:085cde657901 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 87:085cde657901 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 87:085cde657901 | 16 | * without specific prior written permission. |
mbed_official | 87:085cde657901 | 17 | * |
mbed_official | 87:085cde657901 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 87:085cde657901 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 87:085cde657901 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 87:085cde657901 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 87:085cde657901 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 87:085cde657901 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 87:085cde657901 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 87:085cde657901 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 87:085cde657901 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 87:085cde657901 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 87:085cde657901 | 28 | ******************************************************************************* |
mbed_official | 87:085cde657901 | 29 | */ |
mbed_official | 87:085cde657901 | 30 | #include "i2c_api.h" |
mbed_official | 87:085cde657901 | 31 | |
mbed_official | 87:085cde657901 | 32 | #if DEVICE_I2C |
mbed_official | 87:085cde657901 | 33 | |
mbed_official | 87:085cde657901 | 34 | #include "cmsis.h" |
mbed_official | 87:085cde657901 | 35 | #include "pinmap.h" |
mbed_official | 87:085cde657901 | 36 | #include "error.h" |
mbed_official | 87:085cde657901 | 37 | |
mbed_official | 87:085cde657901 | 38 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 172:2f4f8c56b261 | 39 | not based on accurate values, they just guarantee that the application will |
mbed_official | 172:2f4f8c56b261 | 40 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 87:085cde657901 | 41 | #define FLAG_TIMEOUT ((int)0x1000) |
mbed_official | 87:085cde657901 | 42 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 87:085cde657901 | 43 | |
mbed_official | 87:085cde657901 | 44 | static const PinMap PinMap_I2C_SDA[] = { |
mbed_official | 115:4f0cb9cdc478 | 45 | {PB_3, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)}, |
mbed_official | 115:4f0cb9cdc478 | 46 | {PB_4, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)}, |
mbed_official | 125:23cc3068a9e4 | 47 | {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 125:23cc3068a9e4 | 48 | {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 125:23cc3068a9e4 | 49 | {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, |
mbed_official | 87:085cde657901 | 50 | {NC, NC, 0} |
mbed_official | 87:085cde657901 | 51 | }; |
mbed_official | 87:085cde657901 | 52 | |
mbed_official | 87:085cde657901 | 53 | static const PinMap PinMap_I2C_SCL[] = { |
mbed_official | 125:23cc3068a9e4 | 54 | {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, |
mbed_official | 125:23cc3068a9e4 | 55 | {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 88:81f18c97d490 | 56 | {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 115:4f0cb9cdc478 | 57 | {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, |
mbed_official | 87:085cde657901 | 58 | {NC, NC, 0} |
mbed_official | 87:085cde657901 | 59 | }; |
mbed_official | 87:085cde657901 | 60 | |
mbed_official | 87:085cde657901 | 61 | I2C_HandleTypeDef I2cHandle; |
mbed_official | 87:085cde657901 | 62 | |
mbed_official | 172:2f4f8c56b261 | 63 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
mbed_official | 87:085cde657901 | 64 | // Determine the I2C to use |
mbed_official | 87:085cde657901 | 65 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 87:085cde657901 | 66 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 87:085cde657901 | 67 | |
mbed_official | 87:085cde657901 | 68 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 172:2f4f8c56b261 | 69 | |
mbed_official | 87:085cde657901 | 70 | if (obj->i2c == (I2CName)NC) { |
mbed_official | 87:085cde657901 | 71 | error("I2C error: pinout mapping failed."); |
mbed_official | 87:085cde657901 | 72 | } |
mbed_official | 87:085cde657901 | 73 | |
mbed_official | 87:085cde657901 | 74 | // Enable I2C clock |
mbed_official | 172:2f4f8c56b261 | 75 | if (obj->i2c == I2C_1) { |
mbed_official | 87:085cde657901 | 76 | __I2C1_CLK_ENABLE(); |
mbed_official | 87:085cde657901 | 77 | } |
mbed_official | 115:4f0cb9cdc478 | 78 | if (obj->i2c == I2C_2) { |
mbed_official | 115:4f0cb9cdc478 | 79 | __I2C2_CLK_ENABLE(); |
mbed_official | 115:4f0cb9cdc478 | 80 | } |
mbed_official | 115:4f0cb9cdc478 | 81 | if (obj->i2c == I2C_3) { |
mbed_official | 115:4f0cb9cdc478 | 82 | __I2C3_CLK_ENABLE(); |
mbed_official | 115:4f0cb9cdc478 | 83 | } |
mbed_official | 87:085cde657901 | 84 | |
mbed_official | 87:085cde657901 | 85 | // Configure I2C pins |
mbed_official | 87:085cde657901 | 86 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 87:085cde657901 | 87 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 87:085cde657901 | 88 | pin_mode(sda, OpenDrain); |
mbed_official | 87:085cde657901 | 89 | pin_mode(scl, OpenDrain); |
mbed_official | 172:2f4f8c56b261 | 90 | |
mbed_official | 87:085cde657901 | 91 | // Reset to clear pending flags if any |
mbed_official | 87:085cde657901 | 92 | i2c_reset(obj); |
mbed_official | 172:2f4f8c56b261 | 93 | |
mbed_official | 87:085cde657901 | 94 | // I2C configuration |
mbed_official | 172:2f4f8c56b261 | 95 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 181:a4cbdfbbd2f4 | 96 | |
mbed_official | 181:a4cbdfbbd2f4 | 97 | // I2C master by default |
mbed_official | 181:a4cbdfbbd2f4 | 98 | obj->slave = 0; |
mbed_official | 87:085cde657901 | 99 | } |
mbed_official | 87:085cde657901 | 100 | |
mbed_official | 87:085cde657901 | 101 | void i2c_frequency(i2c_t *obj, int hz) { |
mbed_official | 87:085cde657901 | 102 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 172:2f4f8c56b261 | 103 | |
mbed_official | 87:085cde657901 | 104 | if ((hz != 0) && (hz <= 400000)) { |
mbed_official | 87:085cde657901 | 105 | // I2C configuration |
mbed_official | 87:085cde657901 | 106 | I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; |
mbed_official | 87:085cde657901 | 107 | I2cHandle.Init.ClockSpeed = hz; |
mbed_official | 87:085cde657901 | 108 | I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED; |
mbed_official | 87:085cde657901 | 109 | I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2; |
mbed_official | 87:085cde657901 | 110 | I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED; |
mbed_official | 87:085cde657901 | 111 | I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED; |
mbed_official | 87:085cde657901 | 112 | I2cHandle.Init.OwnAddress1 = 0; |
mbed_official | 87:085cde657901 | 113 | I2cHandle.Init.OwnAddress2 = 0; |
mbed_official | 87:085cde657901 | 114 | HAL_I2C_Init(&I2cHandle); |
mbed_official | 181:a4cbdfbbd2f4 | 115 | if(obj->slave) { |
mbed_official | 181:a4cbdfbbd2f4 | 116 | /* Enable Address Acknowledge */ |
mbed_official | 181:a4cbdfbbd2f4 | 117 | I2cHandle.Instance->CR1 |= I2C_CR1_ACK; |
mbed_official | 181:a4cbdfbbd2f4 | 118 | } |
mbed_official | 87:085cde657901 | 119 | } |
mbed_official | 87:085cde657901 | 120 | else { |
mbed_official | 87:085cde657901 | 121 | error("I2C error: frequency setting failed (max 400kHz)."); |
mbed_official | 87:085cde657901 | 122 | } |
mbed_official | 87:085cde657901 | 123 | } |
mbed_official | 87:085cde657901 | 124 | |
mbed_official | 87:085cde657901 | 125 | inline int i2c_start(i2c_t *obj) { |
mbed_official | 87:085cde657901 | 126 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 87:085cde657901 | 127 | int timeout; |
mbed_official | 172:2f4f8c56b261 | 128 | |
mbed_official | 87:085cde657901 | 129 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 172:2f4f8c56b261 | 130 | |
mbed_official | 87:085cde657901 | 131 | // Clear Acknowledge failure flag |
mbed_official | 87:085cde657901 | 132 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF); |
mbed_official | 172:2f4f8c56b261 | 133 | |
mbed_official | 87:085cde657901 | 134 | // Generate the START condition |
mbed_official | 87:085cde657901 | 135 | i2c->CR1 |= I2C_CR1_START; |
mbed_official | 172:2f4f8c56b261 | 136 | |
mbed_official | 87:085cde657901 | 137 | // Wait the START condition has been correctly sent |
mbed_official | 87:085cde657901 | 138 | timeout = FLAG_TIMEOUT; |
mbed_official | 87:085cde657901 | 139 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) { |
mbed_official | 172:2f4f8c56b261 | 140 | if ((timeout--) == 0) { |
mbed_official | 172:2f4f8c56b261 | 141 | return 1; |
mbed_official | 172:2f4f8c56b261 | 142 | } |
mbed_official | 87:085cde657901 | 143 | } |
mbed_official | 172:2f4f8c56b261 | 144 | |
mbed_official | 87:085cde657901 | 145 | return 0; |
mbed_official | 87:085cde657901 | 146 | } |
mbed_official | 87:085cde657901 | 147 | |
mbed_official | 87:085cde657901 | 148 | inline int i2c_stop(i2c_t *obj) { |
mbed_official | 87:085cde657901 | 149 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 172:2f4f8c56b261 | 150 | |
mbed_official | 87:085cde657901 | 151 | // Generate the STOP condition |
mbed_official | 87:085cde657901 | 152 | i2c->CR1 |= I2C_CR1_STOP; |
mbed_official | 87:085cde657901 | 153 | |
mbed_official | 87:085cde657901 | 154 | return 0; |
mbed_official | 87:085cde657901 | 155 | } |
mbed_official | 87:085cde657901 | 156 | |
mbed_official | 172:2f4f8c56b261 | 157 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { |
mbed_official | 183:46ae3190e86c | 158 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 183:46ae3190e86c | 159 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 183:46ae3190e86c | 160 | int timeout; |
mbed_official | 183:46ae3190e86c | 161 | int count; |
mbed_official | 183:46ae3190e86c | 162 | int value; |
mbed_official | 183:46ae3190e86c | 163 | |
mbed_official | 87:085cde657901 | 164 | if (length == 0) return 0; |
mbed_official | 172:2f4f8c56b261 | 165 | |
mbed_official | 183:46ae3190e86c | 166 | i2c_start(obj); |
mbed_official | 87:085cde657901 | 167 | |
mbed_official | 183:46ae3190e86c | 168 | // Wait until SB flag is set |
mbed_official | 183:46ae3190e86c | 169 | timeout = FLAG_TIMEOUT; |
mbed_official | 183:46ae3190e86c | 170 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) { |
mbed_official | 183:46ae3190e86c | 171 | timeout--; |
mbed_official | 183:46ae3190e86c | 172 | if (timeout == 0) { |
mbed_official | 183:46ae3190e86c | 173 | return 0; |
mbed_official | 183:46ae3190e86c | 174 | } |
mbed_official | 87:085cde657901 | 175 | } |
mbed_official | 183:46ae3190e86c | 176 | |
mbed_official | 183:46ae3190e86c | 177 | i2c->DR = __HAL_I2C_7BIT_ADD_READ(address); |
mbed_official | 183:46ae3190e86c | 178 | |
mbed_official | 183:46ae3190e86c | 179 | |
mbed_official | 183:46ae3190e86c | 180 | // Wait address is acknowledged |
mbed_official | 183:46ae3190e86c | 181 | timeout = FLAG_TIMEOUT; |
mbed_official | 183:46ae3190e86c | 182 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) { |
mbed_official | 183:46ae3190e86c | 183 | timeout--; |
mbed_official | 183:46ae3190e86c | 184 | if (timeout == 0) { |
mbed_official | 183:46ae3190e86c | 185 | return 0; |
mbed_official | 183:46ae3190e86c | 186 | } |
mbed_official | 183:46ae3190e86c | 187 | } |
mbed_official | 183:46ae3190e86c | 188 | __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle); |
mbed_official | 183:46ae3190e86c | 189 | |
mbed_official | 183:46ae3190e86c | 190 | // Read all bytes except last one |
mbed_official | 183:46ae3190e86c | 191 | for (count = 0; count < (length - 1); count++) { |
mbed_official | 183:46ae3190e86c | 192 | value = i2c_byte_read(obj, 0); |
mbed_official | 183:46ae3190e86c | 193 | data[count] = (char)value; |
mbed_official | 183:46ae3190e86c | 194 | } |
mbed_official | 183:46ae3190e86c | 195 | |
mbed_official | 183:46ae3190e86c | 196 | // If not repeated start, send stop. |
mbed_official | 183:46ae3190e86c | 197 | // Warning: must be done BEFORE the data is read. |
mbed_official | 183:46ae3190e86c | 198 | if (stop) { |
mbed_official | 183:46ae3190e86c | 199 | i2c_stop(obj); |
mbed_official | 183:46ae3190e86c | 200 | } |
mbed_official | 183:46ae3190e86c | 201 | |
mbed_official | 183:46ae3190e86c | 202 | // Read the last byte |
mbed_official | 183:46ae3190e86c | 203 | value = i2c_byte_read(obj, 1); |
mbed_official | 183:46ae3190e86c | 204 | data[count] = (char)value; |
mbed_official | 87:085cde657901 | 205 | |
mbed_official | 87:085cde657901 | 206 | return length; |
mbed_official | 87:085cde657901 | 207 | } |
mbed_official | 87:085cde657901 | 208 | |
mbed_official | 87:085cde657901 | 209 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { |
mbed_official | 183:46ae3190e86c | 210 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 183:46ae3190e86c | 211 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 183:46ae3190e86c | 212 | int timeout; |
mbed_official | 183:46ae3190e86c | 213 | int count; |
mbed_official | 172:2f4f8c56b261 | 214 | |
mbed_official | 183:46ae3190e86c | 215 | if (length == 0) return 0; |
mbed_official | 183:46ae3190e86c | 216 | i2c_start(obj); |
mbed_official | 87:085cde657901 | 217 | |
mbed_official | 183:46ae3190e86c | 218 | // Wait until SB flag is set |
mbed_official | 183:46ae3190e86c | 219 | timeout = FLAG_TIMEOUT; |
mbed_official | 183:46ae3190e86c | 220 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) { |
mbed_official | 183:46ae3190e86c | 221 | timeout--; |
mbed_official | 183:46ae3190e86c | 222 | if (timeout == 0) { |
mbed_official | 183:46ae3190e86c | 223 | return 0; |
mbed_official | 183:46ae3190e86c | 224 | } |
mbed_official | 183:46ae3190e86c | 225 | } |
mbed_official | 183:46ae3190e86c | 226 | |
mbed_official | 183:46ae3190e86c | 227 | i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address); |
mbed_official | 183:46ae3190e86c | 228 | |
mbed_official | 183:46ae3190e86c | 229 | |
mbed_official | 183:46ae3190e86c | 230 | // Wait address is acknowledged |
mbed_official | 183:46ae3190e86c | 231 | timeout = FLAG_TIMEOUT; |
mbed_official | 183:46ae3190e86c | 232 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) { |
mbed_official | 183:46ae3190e86c | 233 | timeout--; |
mbed_official | 183:46ae3190e86c | 234 | if (timeout == 0) { |
mbed_official | 183:46ae3190e86c | 235 | return 0; |
mbed_official | 183:46ae3190e86c | 236 | } |
mbed_official | 183:46ae3190e86c | 237 | } |
mbed_official | 183:46ae3190e86c | 238 | __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle); |
mbed_official | 183:46ae3190e86c | 239 | |
mbed_official | 183:46ae3190e86c | 240 | for (count = 0; count < length; count++) { |
mbed_official | 183:46ae3190e86c | 241 | if (i2c_byte_write(obj, data[count]) != 1) { |
mbed_official | 183:46ae3190e86c | 242 | i2c_stop(obj); |
mbed_official | 183:46ae3190e86c | 243 | return 0; |
mbed_official | 183:46ae3190e86c | 244 | } |
mbed_official | 87:085cde657901 | 245 | } |
mbed_official | 172:2f4f8c56b261 | 246 | |
mbed_official | 183:46ae3190e86c | 247 | // If not repeated start, send stop. |
mbed_official | 183:46ae3190e86c | 248 | if (stop) { |
mbed_official | 183:46ae3190e86c | 249 | i2c_stop(obj); |
mbed_official | 183:46ae3190e86c | 250 | } |
mbed_official | 183:46ae3190e86c | 251 | |
mbed_official | 183:46ae3190e86c | 252 | return count; |
mbed_official | 87:085cde657901 | 253 | } |
mbed_official | 87:085cde657901 | 254 | |
mbed_official | 87:085cde657901 | 255 | int i2c_byte_read(i2c_t *obj, int last) { |
mbed_official | 87:085cde657901 | 256 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 87:085cde657901 | 257 | int timeout; |
mbed_official | 172:2f4f8c56b261 | 258 | |
mbed_official | 87:085cde657901 | 259 | if (last) { |
mbed_official | 87:085cde657901 | 260 | // Don't acknowledge the last byte |
mbed_official | 87:085cde657901 | 261 | i2c->CR1 &= ~I2C_CR1_ACK; |
mbed_official | 87:085cde657901 | 262 | } else { |
mbed_official | 87:085cde657901 | 263 | // Acknowledge the byte |
mbed_official | 87:085cde657901 | 264 | i2c->CR1 |= I2C_CR1_ACK; |
mbed_official | 87:085cde657901 | 265 | } |
mbed_official | 87:085cde657901 | 266 | |
mbed_official | 87:085cde657901 | 267 | // Wait until the byte is received |
mbed_official | 87:085cde657901 | 268 | timeout = FLAG_TIMEOUT; |
mbed_official | 87:085cde657901 | 269 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 172:2f4f8c56b261 | 270 | if ((timeout--) == 0) { |
mbed_official | 172:2f4f8c56b261 | 271 | return 0; |
mbed_official | 172:2f4f8c56b261 | 272 | } |
mbed_official | 87:085cde657901 | 273 | } |
mbed_official | 172:2f4f8c56b261 | 274 | |
mbed_official | 87:085cde657901 | 275 | return (int)i2c->DR; |
mbed_official | 87:085cde657901 | 276 | } |
mbed_official | 87:085cde657901 | 277 | |
mbed_official | 87:085cde657901 | 278 | int i2c_byte_write(i2c_t *obj, int data) { |
mbed_official | 87:085cde657901 | 279 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 87:085cde657901 | 280 | int timeout; |
mbed_official | 87:085cde657901 | 281 | |
mbed_official | 87:085cde657901 | 282 | i2c->DR = (uint8_t)data; |
mbed_official | 87:085cde657901 | 283 | |
mbed_official | 87:085cde657901 | 284 | // Wait until the byte is transmitted |
mbed_official | 172:2f4f8c56b261 | 285 | timeout = FLAG_TIMEOUT; |
mbed_official | 87:085cde657901 | 286 | while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) && |
mbed_official | 87:085cde657901 | 287 | (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) { |
mbed_official | 87:085cde657901 | 288 | if ((timeout--) == 0) { |
mbed_official | 87:085cde657901 | 289 | return 0; |
mbed_official | 87:085cde657901 | 290 | } |
mbed_official | 87:085cde657901 | 291 | } |
mbed_official | 172:2f4f8c56b261 | 292 | |
mbed_official | 87:085cde657901 | 293 | return 1; |
mbed_official | 87:085cde657901 | 294 | } |
mbed_official | 87:085cde657901 | 295 | |
mbed_official | 87:085cde657901 | 296 | void i2c_reset(i2c_t *obj) { |
mbed_official | 172:2f4f8c56b261 | 297 | if (obj->i2c == I2C_1) { |
mbed_official | 87:085cde657901 | 298 | __I2C1_FORCE_RESET(); |
mbed_official | 87:085cde657901 | 299 | __I2C1_RELEASE_RESET(); |
mbed_official | 87:085cde657901 | 300 | } |
mbed_official | 115:4f0cb9cdc478 | 301 | if (obj->i2c == I2C_2) { |
mbed_official | 115:4f0cb9cdc478 | 302 | __I2C2_FORCE_RESET(); |
mbed_official | 115:4f0cb9cdc478 | 303 | __I2C2_RELEASE_RESET(); |
mbed_official | 115:4f0cb9cdc478 | 304 | } |
mbed_official | 115:4f0cb9cdc478 | 305 | if (obj->i2c == I2C_3) { |
mbed_official | 115:4f0cb9cdc478 | 306 | __I2C3_FORCE_RESET(); |
mbed_official | 115:4f0cb9cdc478 | 307 | __I2C3_RELEASE_RESET(); |
mbed_official | 115:4f0cb9cdc478 | 308 | } |
mbed_official | 87:085cde657901 | 309 | } |
mbed_official | 87:085cde657901 | 310 | |
mbed_official | 87:085cde657901 | 311 | #if DEVICE_I2CSLAVE |
mbed_official | 87:085cde657901 | 312 | |
mbed_official | 87:085cde657901 | 313 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) { |
mbed_official | 87:085cde657901 | 314 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 181:a4cbdfbbd2f4 | 315 | uint16_t tmpreg = 0; |
mbed_official | 87:085cde657901 | 316 | |
mbed_official | 87:085cde657901 | 317 | // Get the old register value |
mbed_official | 87:085cde657901 | 318 | tmpreg = i2c->OAR1; |
mbed_official | 87:085cde657901 | 319 | // Reset address bits |
mbed_official | 87:085cde657901 | 320 | tmpreg &= 0xFC00; |
mbed_official | 87:085cde657901 | 321 | // Set new address |
mbed_official | 87:085cde657901 | 322 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 87:085cde657901 | 323 | // Store the new register value |
mbed_official | 87:085cde657901 | 324 | i2c->OAR1 = tmpreg; |
mbed_official | 87:085cde657901 | 325 | } |
mbed_official | 87:085cde657901 | 326 | |
mbed_official | 87:085cde657901 | 327 | void i2c_slave_mode(i2c_t *obj, int enable_slave) { |
mbed_official | 181:a4cbdfbbd2f4 | 328 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 181:a4cbdfbbd2f4 | 329 | if(enable_slave) { |
mbed_official | 181:a4cbdfbbd2f4 | 330 | obj->slave = 1; |
mbed_official | 181:a4cbdfbbd2f4 | 331 | /* Enable Address Acknowledge */ |
mbed_official | 181:a4cbdfbbd2f4 | 332 | I2cHandle.Instance->CR1 |= I2C_CR1_ACK; |
mbed_official | 181:a4cbdfbbd2f4 | 333 | } |
mbed_official | 87:085cde657901 | 334 | } |
mbed_official | 87:085cde657901 | 335 | |
mbed_official | 87:085cde657901 | 336 | // See I2CSlave.h |
mbed_official | 87:085cde657901 | 337 | #define NoData 0 // the slave has not been addressed |
mbed_official | 87:085cde657901 | 338 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 87:085cde657901 | 339 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 87:085cde657901 | 340 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 87:085cde657901 | 341 | |
mbed_official | 87:085cde657901 | 342 | int i2c_slave_receive(i2c_t *obj) { |
mbed_official | 181:a4cbdfbbd2f4 | 343 | int retValue = NoData; |
mbed_official | 181:a4cbdfbbd2f4 | 344 | |
mbed_official | 181:a4cbdfbbd2f4 | 345 | if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) { |
mbed_official | 181:a4cbdfbbd2f4 | 346 | if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) { |
mbed_official | 181:a4cbdfbbd2f4 | 347 | if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1) |
mbed_official | 181:a4cbdfbbd2f4 | 348 | retValue = ReadAddressed; |
mbed_official | 181:a4cbdfbbd2f4 | 349 | else |
mbed_official | 181:a4cbdfbbd2f4 | 350 | retValue = WriteAddressed; |
mbed_official | 181:a4cbdfbbd2f4 | 351 | |
mbed_official | 181:a4cbdfbbd2f4 | 352 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR); |
mbed_official | 181:a4cbdfbbd2f4 | 353 | } |
mbed_official | 181:a4cbdfbbd2f4 | 354 | } |
mbed_official | 181:a4cbdfbbd2f4 | 355 | |
mbed_official | 181:a4cbdfbbd2f4 | 356 | return(retValue); |
mbed_official | 87:085cde657901 | 357 | } |
mbed_official | 87:085cde657901 | 358 | |
mbed_official | 87:085cde657901 | 359 | int i2c_slave_read(i2c_t *obj, char *data, int length) { |
mbed_official | 181:a4cbdfbbd2f4 | 360 | uint32_t Timeout; |
mbed_official | 181:a4cbdfbbd2f4 | 361 | int size = 0; |
mbed_official | 87:085cde657901 | 362 | if (length == 0) return 0; |
mbed_official | 172:2f4f8c56b261 | 363 | |
mbed_official | 87:085cde657901 | 364 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 87:085cde657901 | 365 | |
mbed_official | 181:a4cbdfbbd2f4 | 366 | while(length > 0) |
mbed_official | 181:a4cbdfbbd2f4 | 367 | { |
mbed_official | 181:a4cbdfbbd2f4 | 368 | /* Wait until RXNE flag is set */ |
mbed_official | 181:a4cbdfbbd2f4 | 369 | // Wait until the byte is received |
mbed_official | 181:a4cbdfbbd2f4 | 370 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 371 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 181:a4cbdfbbd2f4 | 372 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 373 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 374 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 375 | } |
mbed_official | 181:a4cbdfbbd2f4 | 376 | } |
mbed_official | 181:a4cbdfbbd2f4 | 377 | |
mbed_official | 181:a4cbdfbbd2f4 | 378 | /* Read data from DR */ |
mbed_official | 181:a4cbdfbbd2f4 | 379 | (*data++) = I2cHandle.Instance->DR; |
mbed_official | 181:a4cbdfbbd2f4 | 380 | length--; |
mbed_official | 181:a4cbdfbbd2f4 | 381 | size++; |
mbed_official | 181:a4cbdfbbd2f4 | 382 | |
mbed_official | 181:a4cbdfbbd2f4 | 383 | if((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)){ |
mbed_official | 181:a4cbdfbbd2f4 | 384 | /* Read data from DR */ |
mbed_official | 181:a4cbdfbbd2f4 | 385 | (*data++) = I2cHandle.Instance->DR; |
mbed_official | 181:a4cbdfbbd2f4 | 386 | length--; |
mbed_official | 181:a4cbdfbbd2f4 | 387 | size++; |
mbed_official | 181:a4cbdfbbd2f4 | 388 | } |
mbed_official | 87:085cde657901 | 389 | } |
mbed_official | 87:085cde657901 | 390 | |
mbed_official | 181:a4cbdfbbd2f4 | 391 | /* Wait until STOP flag is set */ |
mbed_official | 181:a4cbdfbbd2f4 | 392 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 393 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 181:a4cbdfbbd2f4 | 394 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 395 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 396 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 397 | } |
mbed_official | 181:a4cbdfbbd2f4 | 398 | } |
mbed_official | 181:a4cbdfbbd2f4 | 399 | |
mbed_official | 181:a4cbdfbbd2f4 | 400 | /* Clear STOP flag */ |
mbed_official | 181:a4cbdfbbd2f4 | 401 | __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle); |
mbed_official | 181:a4cbdfbbd2f4 | 402 | |
mbed_official | 181:a4cbdfbbd2f4 | 403 | /* Wait until BUSY flag is reset */ |
mbed_official | 181:a4cbdfbbd2f4 | 404 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 405 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) { |
mbed_official | 181:a4cbdfbbd2f4 | 406 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 407 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 408 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 409 | } |
mbed_official | 181:a4cbdfbbd2f4 | 410 | } |
mbed_official | 181:a4cbdfbbd2f4 | 411 | |
mbed_official | 181:a4cbdfbbd2f4 | 412 | return size; |
mbed_official | 87:085cde657901 | 413 | } |
mbed_official | 87:085cde657901 | 414 | |
mbed_official | 87:085cde657901 | 415 | int i2c_slave_write(i2c_t *obj, const char *data, int length) { |
mbed_official | 181:a4cbdfbbd2f4 | 416 | uint32_t Timeout; |
mbed_official | 181:a4cbdfbbd2f4 | 417 | int size = 0; |
mbed_official | 87:085cde657901 | 418 | if (length == 0) return 0; |
mbed_official | 172:2f4f8c56b261 | 419 | |
mbed_official | 87:085cde657901 | 420 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 87:085cde657901 | 421 | |
mbed_official | 181:a4cbdfbbd2f4 | 422 | while(length > 0) |
mbed_official | 181:a4cbdfbbd2f4 | 423 | { |
mbed_official | 181:a4cbdfbbd2f4 | 424 | /* Wait until TXE flag is set */ |
mbed_official | 181:a4cbdfbbd2f4 | 425 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 426 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) { |
mbed_official | 181:a4cbdfbbd2f4 | 427 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 428 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 429 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 430 | } |
mbed_official | 181:a4cbdfbbd2f4 | 431 | } |
mbed_official | 181:a4cbdfbbd2f4 | 432 | |
mbed_official | 181:a4cbdfbbd2f4 | 433 | |
mbed_official | 181:a4cbdfbbd2f4 | 434 | /* Write data to DR */ |
mbed_official | 181:a4cbdfbbd2f4 | 435 | I2cHandle.Instance->DR = (*data++); |
mbed_official | 181:a4cbdfbbd2f4 | 436 | length--; |
mbed_official | 181:a4cbdfbbd2f4 | 437 | size++; |
mbed_official | 181:a4cbdfbbd2f4 | 438 | |
mbed_official | 181:a4cbdfbbd2f4 | 439 | if((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) |
mbed_official | 181:a4cbdfbbd2f4 | 440 | { |
mbed_official | 181:a4cbdfbbd2f4 | 441 | /* Write data to DR */ |
mbed_official | 181:a4cbdfbbd2f4 | 442 | I2cHandle.Instance->DR = (*data++); |
mbed_official | 181:a4cbdfbbd2f4 | 443 | length--; |
mbed_official | 181:a4cbdfbbd2f4 | 444 | size++; |
mbed_official | 181:a4cbdfbbd2f4 | 445 | } |
mbed_official | 181:a4cbdfbbd2f4 | 446 | } |
mbed_official | 181:a4cbdfbbd2f4 | 447 | |
mbed_official | 181:a4cbdfbbd2f4 | 448 | /* Wait until AF flag is set */ |
mbed_official | 181:a4cbdfbbd2f4 | 449 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 450 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) { |
mbed_official | 181:a4cbdfbbd2f4 | 451 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 452 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 453 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 454 | } |
mbed_official | 181:a4cbdfbbd2f4 | 455 | } |
mbed_official | 181:a4cbdfbbd2f4 | 456 | |
mbed_official | 181:a4cbdfbbd2f4 | 457 | |
mbed_official | 181:a4cbdfbbd2f4 | 458 | /* Clear AF flag */ |
mbed_official | 181:a4cbdfbbd2f4 | 459 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF); |
mbed_official | 181:a4cbdfbbd2f4 | 460 | |
mbed_official | 181:a4cbdfbbd2f4 | 461 | |
mbed_official | 181:a4cbdfbbd2f4 | 462 | /* Wait until BUSY flag is reset */ |
mbed_official | 181:a4cbdfbbd2f4 | 463 | Timeout = FLAG_TIMEOUT; |
mbed_official | 181:a4cbdfbbd2f4 | 464 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) { |
mbed_official | 181:a4cbdfbbd2f4 | 465 | Timeout--; |
mbed_official | 181:a4cbdfbbd2f4 | 466 | if (Timeout == 0) { |
mbed_official | 181:a4cbdfbbd2f4 | 467 | return 0; |
mbed_official | 181:a4cbdfbbd2f4 | 468 | } |
mbed_official | 87:085cde657901 | 469 | } |
mbed_official | 87:085cde657901 | 470 | |
mbed_official | 181:a4cbdfbbd2f4 | 471 | I2cHandle.State = HAL_I2C_STATE_READY; |
mbed_official | 181:a4cbdfbbd2f4 | 472 | |
mbed_official | 181:a4cbdfbbd2f4 | 473 | /* Process Unlocked */ |
mbed_official | 181:a4cbdfbbd2f4 | 474 | __HAL_UNLOCK(&I2cHandle); |
mbed_official | 181:a4cbdfbbd2f4 | 475 | |
mbed_official | 181:a4cbdfbbd2f4 | 476 | return size; |
mbed_official | 87:085cde657901 | 477 | } |
mbed_official | 87:085cde657901 | 478 | |
mbed_official | 87:085cde657901 | 479 | |
mbed_official | 87:085cde657901 | 480 | #endif // DEVICE_I2CSLAVE |
mbed_official | 87:085cde657901 | 481 | |
mbed_official | 87:085cde657901 | 482 | #endif // DEVICE_I2C |