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targets/hal/TARGET_STM/TARGET_DISCO_L053C8/i2c_api.c@439:c4382fcbbaed, 2014-12-15 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Dec 15 09:30:07 2014 +0000
- Revision:
- 439:c4382fcbbaed
- Parent:
- 376:cb4d9db17537
Synchronized with git revision 6172cbea1a558a9a2ebbd965e77f83a9ceeec670
Full URL: https://github.com/mbedmicro/mbed/commit/6172cbea1a558a9a2ebbd965e77f83a9ceeec670/
Targets: DISCO_L053C8 - update from nucleo latest changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 376:cb4d9db17537 | 1 | /* mbed Microcontroller Library |
mbed_official | 376:cb4d9db17537 | 2 | ******************************************************************************* |
mbed_official | 376:cb4d9db17537 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 376:cb4d9db17537 | 4 | * All rights reserved. |
mbed_official | 376:cb4d9db17537 | 5 | * |
mbed_official | 376:cb4d9db17537 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 376:cb4d9db17537 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 376:cb4d9db17537 | 8 | * |
mbed_official | 376:cb4d9db17537 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 376:cb4d9db17537 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 376:cb4d9db17537 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 376:cb4d9db17537 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 376:cb4d9db17537 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 376:cb4d9db17537 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 376:cb4d9db17537 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 376:cb4d9db17537 | 16 | * without specific prior written permission. |
mbed_official | 376:cb4d9db17537 | 17 | * |
mbed_official | 376:cb4d9db17537 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 376:cb4d9db17537 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 376:cb4d9db17537 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 376:cb4d9db17537 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 376:cb4d9db17537 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 376:cb4d9db17537 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 376:cb4d9db17537 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 376:cb4d9db17537 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 376:cb4d9db17537 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 376:cb4d9db17537 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 376:cb4d9db17537 | 28 | ******************************************************************************* |
mbed_official | 376:cb4d9db17537 | 29 | */ |
mbed_official | 376:cb4d9db17537 | 30 | #include "mbed_assert.h" |
mbed_official | 376:cb4d9db17537 | 31 | #include "i2c_api.h" |
mbed_official | 376:cb4d9db17537 | 32 | |
mbed_official | 376:cb4d9db17537 | 33 | #if DEVICE_I2C |
mbed_official | 376:cb4d9db17537 | 34 | |
mbed_official | 376:cb4d9db17537 | 35 | #include "cmsis.h" |
mbed_official | 376:cb4d9db17537 | 36 | #include "pinmap.h" |
mbed_official | 439:c4382fcbbaed | 37 | #include "PeripheralPins.h" |
mbed_official | 376:cb4d9db17537 | 38 | |
mbed_official | 376:cb4d9db17537 | 39 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 376:cb4d9db17537 | 40 | not based on accurate values, they just guarantee that the application will |
mbed_official | 376:cb4d9db17537 | 41 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 376:cb4d9db17537 | 42 | #define FLAG_TIMEOUT ((int)0x1000) |
mbed_official | 376:cb4d9db17537 | 43 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 376:cb4d9db17537 | 44 | |
mbed_official | 376:cb4d9db17537 | 45 | I2C_HandleTypeDef I2cHandle; |
mbed_official | 376:cb4d9db17537 | 46 | |
mbed_official | 376:cb4d9db17537 | 47 | int i2c1_inited = 0; |
mbed_official | 376:cb4d9db17537 | 48 | int i2c2_inited = 0; |
mbed_official | 376:cb4d9db17537 | 49 | |
mbed_official | 439:c4382fcbbaed | 50 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
mbed_official | 439:c4382fcbbaed | 51 | { |
mbed_official | 376:cb4d9db17537 | 52 | // Determine the I2C to use |
mbed_official | 376:cb4d9db17537 | 53 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 376:cb4d9db17537 | 54 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 376:cb4d9db17537 | 55 | |
mbed_official | 376:cb4d9db17537 | 56 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 376:cb4d9db17537 | 57 | MBED_ASSERT(obj->i2c != (I2CName)NC); |
mbed_official | 376:cb4d9db17537 | 58 | |
mbed_official | 376:cb4d9db17537 | 59 | // Enable I2C1 clock and pinout if not done |
mbed_official | 439:c4382fcbbaed | 60 | if ((obj->i2c == I2C_1) && !i2c1_inited) { |
mbed_official | 376:cb4d9db17537 | 61 | i2c1_inited = 1; |
mbed_official | 376:cb4d9db17537 | 62 | __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK); |
mbed_official | 376:cb4d9db17537 | 63 | __I2C1_CLK_ENABLE(); |
mbed_official | 376:cb4d9db17537 | 64 | // Configure I2C pins |
mbed_official | 376:cb4d9db17537 | 65 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 376:cb4d9db17537 | 66 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 376:cb4d9db17537 | 67 | pin_mode(sda, OpenDrain); |
mbed_official | 376:cb4d9db17537 | 68 | pin_mode(scl, OpenDrain); |
mbed_official | 376:cb4d9db17537 | 69 | } |
mbed_official | 376:cb4d9db17537 | 70 | // Enable I2C2 clock and pinout if not done |
mbed_official | 439:c4382fcbbaed | 71 | if ((obj->i2c == I2C_2) && !i2c2_inited) { |
mbed_official | 376:cb4d9db17537 | 72 | i2c2_inited = 1; |
mbed_official | 376:cb4d9db17537 | 73 | __I2C2_CLK_ENABLE(); |
mbed_official | 376:cb4d9db17537 | 74 | // Configure I2C pins |
mbed_official | 376:cb4d9db17537 | 75 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 376:cb4d9db17537 | 76 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 376:cb4d9db17537 | 77 | pin_mode(sda, OpenDrain); |
mbed_official | 376:cb4d9db17537 | 78 | pin_mode(scl, OpenDrain); |
mbed_official | 376:cb4d9db17537 | 79 | } |
mbed_official | 376:cb4d9db17537 | 80 | |
mbed_official | 376:cb4d9db17537 | 81 | // Reset to clear pending flags if any |
mbed_official | 376:cb4d9db17537 | 82 | i2c_reset(obj); |
mbed_official | 376:cb4d9db17537 | 83 | |
mbed_official | 376:cb4d9db17537 | 84 | // I2C configuration |
mbed_official | 376:cb4d9db17537 | 85 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 376:cb4d9db17537 | 86 | } |
mbed_official | 376:cb4d9db17537 | 87 | |
mbed_official | 439:c4382fcbbaed | 88 | void i2c_frequency(i2c_t *obj, int hz) |
mbed_official | 439:c4382fcbbaed | 89 | { |
mbed_official | 376:cb4d9db17537 | 90 | MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000)); |
mbed_official | 376:cb4d9db17537 | 91 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 92 | int timeout; |
mbed_official | 376:cb4d9db17537 | 93 | |
mbed_official | 376:cb4d9db17537 | 94 | // wait before init |
mbed_official | 376:cb4d9db17537 | 95 | timeout = LONG_TIMEOUT; |
mbed_official | 439:c4382fcbbaed | 96 | while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); |
mbed_official | 376:cb4d9db17537 | 97 | |
mbed_official | 376:cb4d9db17537 | 98 | // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0 |
mbed_official | 376:cb4d9db17537 | 99 | switch (hz) { |
mbed_official | 376:cb4d9db17537 | 100 | case 100000: |
mbed_official | 376:cb4d9db17537 | 101 | I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns |
mbed_official | 376:cb4d9db17537 | 102 | break; |
mbed_official | 376:cb4d9db17537 | 103 | case 400000: |
mbed_official | 376:cb4d9db17537 | 104 | I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns |
mbed_official | 376:cb4d9db17537 | 105 | break; |
mbed_official | 376:cb4d9db17537 | 106 | case 1000000: |
mbed_official | 376:cb4d9db17537 | 107 | I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns |
mbed_official | 376:cb4d9db17537 | 108 | break; |
mbed_official | 376:cb4d9db17537 | 109 | default: |
mbed_official | 376:cb4d9db17537 | 110 | break; |
mbed_official | 376:cb4d9db17537 | 111 | } |
mbed_official | 376:cb4d9db17537 | 112 | |
mbed_official | 376:cb4d9db17537 | 113 | // I2C configuration |
mbed_official | 376:cb4d9db17537 | 114 | I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; |
mbed_official | 376:cb4d9db17537 | 115 | I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED; |
mbed_official | 376:cb4d9db17537 | 116 | I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED; |
mbed_official | 376:cb4d9db17537 | 117 | I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED; |
mbed_official | 376:cb4d9db17537 | 118 | I2cHandle.Init.OwnAddress1 = 0; |
mbed_official | 376:cb4d9db17537 | 119 | I2cHandle.Init.OwnAddress2 = 0; |
mbed_official | 376:cb4d9db17537 | 120 | I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK; |
mbed_official | 376:cb4d9db17537 | 121 | HAL_I2C_Init(&I2cHandle); |
mbed_official | 376:cb4d9db17537 | 122 | } |
mbed_official | 376:cb4d9db17537 | 123 | |
mbed_official | 439:c4382fcbbaed | 124 | inline int i2c_start(i2c_t *obj) |
mbed_official | 439:c4382fcbbaed | 125 | { |
mbed_official | 376:cb4d9db17537 | 126 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 127 | int timeout; |
mbed_official | 376:cb4d9db17537 | 128 | |
mbed_official | 376:cb4d9db17537 | 129 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 130 | |
mbed_official | 376:cb4d9db17537 | 131 | // Clear Acknowledge failure flag |
mbed_official | 376:cb4d9db17537 | 132 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF); |
mbed_official | 376:cb4d9db17537 | 133 | |
mbed_official | 376:cb4d9db17537 | 134 | // Generate the START condition |
mbed_official | 376:cb4d9db17537 | 135 | i2c->CR2 |= I2C_CR2_START; |
mbed_official | 376:cb4d9db17537 | 136 | |
mbed_official | 376:cb4d9db17537 | 137 | // Wait the START condition has been correctly sent |
mbed_official | 376:cb4d9db17537 | 138 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 139 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) { |
mbed_official | 376:cb4d9db17537 | 140 | if ((timeout--) == 0) { |
mbed_official | 376:cb4d9db17537 | 141 | return 1; |
mbed_official | 376:cb4d9db17537 | 142 | } |
mbed_official | 376:cb4d9db17537 | 143 | } |
mbed_official | 376:cb4d9db17537 | 144 | |
mbed_official | 376:cb4d9db17537 | 145 | return 0; |
mbed_official | 376:cb4d9db17537 | 146 | } |
mbed_official | 376:cb4d9db17537 | 147 | |
mbed_official | 439:c4382fcbbaed | 148 | inline int i2c_stop(i2c_t *obj) |
mbed_official | 439:c4382fcbbaed | 149 | { |
mbed_official | 376:cb4d9db17537 | 150 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 151 | |
mbed_official | 376:cb4d9db17537 | 152 | // Generate the STOP condition |
mbed_official | 376:cb4d9db17537 | 153 | i2c->CR2 |= I2C_CR2_STOP; |
mbed_official | 376:cb4d9db17537 | 154 | |
mbed_official | 376:cb4d9db17537 | 155 | return 0; |
mbed_official | 376:cb4d9db17537 | 156 | } |
mbed_official | 376:cb4d9db17537 | 157 | |
mbed_official | 439:c4382fcbbaed | 158 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
mbed_official | 439:c4382fcbbaed | 159 | { |
mbed_official | 376:cb4d9db17537 | 160 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 161 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 162 | int timeout; |
mbed_official | 376:cb4d9db17537 | 163 | int count; |
mbed_official | 376:cb4d9db17537 | 164 | int value; |
mbed_official | 376:cb4d9db17537 | 165 | |
mbed_official | 376:cb4d9db17537 | 166 | /* update CR2 register */ |
mbed_official | 376:cb4d9db17537 | 167 | 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 | 376:cb4d9db17537 | 168 | | (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 | 376:cb4d9db17537 | 169 | |
mbed_official | 376:cb4d9db17537 | 170 | // Read all bytes |
mbed_official | 376:cb4d9db17537 | 171 | for (count = 0; count < length; count++) { |
mbed_official | 376:cb4d9db17537 | 172 | value = i2c_byte_read(obj, 0); |
mbed_official | 376:cb4d9db17537 | 173 | data[count] = (char)value; |
mbed_official | 376:cb4d9db17537 | 174 | } |
mbed_official | 376:cb4d9db17537 | 175 | |
mbed_official | 376:cb4d9db17537 | 176 | // Wait transfer complete |
mbed_official | 376:cb4d9db17537 | 177 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 178 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 376:cb4d9db17537 | 179 | timeout--; |
mbed_official | 376:cb4d9db17537 | 180 | if (timeout == 0) { |
mbed_official | 376:cb4d9db17537 | 181 | return -1; |
mbed_official | 376:cb4d9db17537 | 182 | } |
mbed_official | 376:cb4d9db17537 | 183 | } |
mbed_official | 376:cb4d9db17537 | 184 | |
mbed_official | 376:cb4d9db17537 | 185 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 376:cb4d9db17537 | 186 | |
mbed_official | 376:cb4d9db17537 | 187 | // If not repeated start, send stop. |
mbed_official | 376:cb4d9db17537 | 188 | if (stop) { |
mbed_official | 376:cb4d9db17537 | 189 | i2c_stop(obj); |
mbed_official | 376:cb4d9db17537 | 190 | /* Wait until STOPF flag is set */ |
mbed_official | 376:cb4d9db17537 | 191 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 192 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 376:cb4d9db17537 | 193 | timeout--; |
mbed_official | 376:cb4d9db17537 | 194 | if (timeout == 0) { |
mbed_official | 376:cb4d9db17537 | 195 | return -1; |
mbed_official | 376:cb4d9db17537 | 196 | } |
mbed_official | 376:cb4d9db17537 | 197 | } |
mbed_official | 376:cb4d9db17537 | 198 | /* Clear STOP Flag */ |
mbed_official | 376:cb4d9db17537 | 199 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 376:cb4d9db17537 | 200 | } |
mbed_official | 376:cb4d9db17537 | 201 | |
mbed_official | 376:cb4d9db17537 | 202 | return length; |
mbed_official | 376:cb4d9db17537 | 203 | } |
mbed_official | 376:cb4d9db17537 | 204 | |
mbed_official | 439:c4382fcbbaed | 205 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
mbed_official | 439:c4382fcbbaed | 206 | { |
mbed_official | 376:cb4d9db17537 | 207 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 208 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 209 | int timeout; |
mbed_official | 376:cb4d9db17537 | 210 | int count; |
mbed_official | 376:cb4d9db17537 | 211 | |
mbed_official | 376:cb4d9db17537 | 212 | /* update CR2 register */ |
mbed_official | 376:cb4d9db17537 | 213 | 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 | 376:cb4d9db17537 | 214 | | (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 | 376:cb4d9db17537 | 215 | |
mbed_official | 376:cb4d9db17537 | 216 | for (count = 0; count < length; count++) { |
mbed_official | 376:cb4d9db17537 | 217 | i2c_byte_write(obj, data[count]); |
mbed_official | 376:cb4d9db17537 | 218 | } |
mbed_official | 376:cb4d9db17537 | 219 | |
mbed_official | 376:cb4d9db17537 | 220 | // Wait transfer complete |
mbed_official | 376:cb4d9db17537 | 221 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 222 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 376:cb4d9db17537 | 223 | timeout--; |
mbed_official | 376:cb4d9db17537 | 224 | if (timeout == 0) { |
mbed_official | 376:cb4d9db17537 | 225 | return -1; |
mbed_official | 376:cb4d9db17537 | 226 | } |
mbed_official | 376:cb4d9db17537 | 227 | } |
mbed_official | 376:cb4d9db17537 | 228 | |
mbed_official | 376:cb4d9db17537 | 229 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 376:cb4d9db17537 | 230 | |
mbed_official | 376:cb4d9db17537 | 231 | // If not repeated start, send stop. |
mbed_official | 376:cb4d9db17537 | 232 | if (stop) { |
mbed_official | 376:cb4d9db17537 | 233 | i2c_stop(obj); |
mbed_official | 376:cb4d9db17537 | 234 | /* Wait until STOPF flag is set */ |
mbed_official | 376:cb4d9db17537 | 235 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 236 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 376:cb4d9db17537 | 237 | timeout--; |
mbed_official | 376:cb4d9db17537 | 238 | if (timeout == 0) { |
mbed_official | 376:cb4d9db17537 | 239 | return -1; |
mbed_official | 376:cb4d9db17537 | 240 | } |
mbed_official | 376:cb4d9db17537 | 241 | } |
mbed_official | 376:cb4d9db17537 | 242 | /* Clear STOP Flag */ |
mbed_official | 376:cb4d9db17537 | 243 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 376:cb4d9db17537 | 244 | } |
mbed_official | 376:cb4d9db17537 | 245 | |
mbed_official | 376:cb4d9db17537 | 246 | return count; |
mbed_official | 376:cb4d9db17537 | 247 | } |
mbed_official | 376:cb4d9db17537 | 248 | |
mbed_official | 439:c4382fcbbaed | 249 | int i2c_byte_read(i2c_t *obj, int last) |
mbed_official | 439:c4382fcbbaed | 250 | { |
mbed_official | 376:cb4d9db17537 | 251 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 252 | int timeout; |
mbed_official | 376:cb4d9db17537 | 253 | |
mbed_official | 376:cb4d9db17537 | 254 | // Wait until the byte is received |
mbed_official | 376:cb4d9db17537 | 255 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 256 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 376:cb4d9db17537 | 257 | if ((timeout--) == 0) { |
mbed_official | 376:cb4d9db17537 | 258 | return -1; |
mbed_official | 376:cb4d9db17537 | 259 | } |
mbed_official | 376:cb4d9db17537 | 260 | } |
mbed_official | 376:cb4d9db17537 | 261 | |
mbed_official | 376:cb4d9db17537 | 262 | return (int)i2c->RXDR; |
mbed_official | 376:cb4d9db17537 | 263 | } |
mbed_official | 376:cb4d9db17537 | 264 | |
mbed_official | 439:c4382fcbbaed | 265 | int i2c_byte_write(i2c_t *obj, int data) |
mbed_official | 439:c4382fcbbaed | 266 | { |
mbed_official | 376:cb4d9db17537 | 267 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 268 | int timeout; |
mbed_official | 376:cb4d9db17537 | 269 | |
mbed_official | 376:cb4d9db17537 | 270 | // Wait until the previous byte is transmitted |
mbed_official | 376:cb4d9db17537 | 271 | timeout = FLAG_TIMEOUT; |
mbed_official | 376:cb4d9db17537 | 272 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) { |
mbed_official | 376:cb4d9db17537 | 273 | if ((timeout--) == 0) { |
mbed_official | 376:cb4d9db17537 | 274 | return 0; |
mbed_official | 376:cb4d9db17537 | 275 | } |
mbed_official | 376:cb4d9db17537 | 276 | } |
mbed_official | 376:cb4d9db17537 | 277 | |
mbed_official | 376:cb4d9db17537 | 278 | i2c->TXDR = (uint8_t)data; |
mbed_official | 376:cb4d9db17537 | 279 | |
mbed_official | 376:cb4d9db17537 | 280 | return 1; |
mbed_official | 376:cb4d9db17537 | 281 | } |
mbed_official | 376:cb4d9db17537 | 282 | |
mbed_official | 439:c4382fcbbaed | 283 | void i2c_reset(i2c_t *obj) |
mbed_official | 439:c4382fcbbaed | 284 | { |
mbed_official | 376:cb4d9db17537 | 285 | int timeout; |
mbed_official | 439:c4382fcbbaed | 286 | |
mbed_official | 376:cb4d9db17537 | 287 | // wait before reset |
mbed_official | 376:cb4d9db17537 | 288 | timeout = LONG_TIMEOUT; |
mbed_official | 439:c4382fcbbaed | 289 | while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); |
mbed_official | 376:cb4d9db17537 | 290 | |
mbed_official | 376:cb4d9db17537 | 291 | if (obj->i2c == I2C_1) { |
mbed_official | 376:cb4d9db17537 | 292 | __I2C1_FORCE_RESET(); |
mbed_official | 376:cb4d9db17537 | 293 | __I2C1_RELEASE_RESET(); |
mbed_official | 376:cb4d9db17537 | 294 | } |
mbed_official | 376:cb4d9db17537 | 295 | if (obj->i2c == I2C_2) { |
mbed_official | 376:cb4d9db17537 | 296 | __I2C2_FORCE_RESET(); |
mbed_official | 376:cb4d9db17537 | 297 | __I2C2_RELEASE_RESET(); |
mbed_official | 376:cb4d9db17537 | 298 | } |
mbed_official | 376:cb4d9db17537 | 299 | } |
mbed_official | 376:cb4d9db17537 | 300 | |
mbed_official | 376:cb4d9db17537 | 301 | #if DEVICE_I2CSLAVE |
mbed_official | 376:cb4d9db17537 | 302 | |
mbed_official | 439:c4382fcbbaed | 303 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) |
mbed_official | 439:c4382fcbbaed | 304 | { |
mbed_official | 376:cb4d9db17537 | 305 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 306 | uint16_t tmpreg; |
mbed_official | 376:cb4d9db17537 | 307 | |
mbed_official | 376:cb4d9db17537 | 308 | // disable |
mbed_official | 376:cb4d9db17537 | 309 | i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 376:cb4d9db17537 | 310 | // Get the old register value |
mbed_official | 376:cb4d9db17537 | 311 | tmpreg = i2c->OAR1; |
mbed_official | 376:cb4d9db17537 | 312 | // Reset address bits |
mbed_official | 376:cb4d9db17537 | 313 | tmpreg &= 0xFC00; |
mbed_official | 376:cb4d9db17537 | 314 | // Set new address |
mbed_official | 376:cb4d9db17537 | 315 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 376:cb4d9db17537 | 316 | // Store the new register value |
mbed_official | 376:cb4d9db17537 | 317 | i2c->OAR1 = tmpreg; |
mbed_official | 376:cb4d9db17537 | 318 | // enable |
mbed_official | 376:cb4d9db17537 | 319 | i2c->OAR1 |= I2C_OAR1_OA1EN; |
mbed_official | 376:cb4d9db17537 | 320 | } |
mbed_official | 376:cb4d9db17537 | 321 | |
mbed_official | 439:c4382fcbbaed | 322 | void i2c_slave_mode(i2c_t *obj, int enable_slave) |
mbed_official | 439:c4382fcbbaed | 323 | { |
mbed_official | 376:cb4d9db17537 | 324 | |
mbed_official | 376:cb4d9db17537 | 325 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 326 | uint16_t tmpreg; |
mbed_official | 376:cb4d9db17537 | 327 | |
mbed_official | 376:cb4d9db17537 | 328 | // Get the old register value |
mbed_official | 376:cb4d9db17537 | 329 | tmpreg = i2c->OAR1; |
mbed_official | 376:cb4d9db17537 | 330 | |
mbed_official | 376:cb4d9db17537 | 331 | // Enable / disable slave |
mbed_official | 376:cb4d9db17537 | 332 | if (enable_slave == 1) { |
mbed_official | 376:cb4d9db17537 | 333 | tmpreg |= I2C_OAR1_OA1EN; |
mbed_official | 376:cb4d9db17537 | 334 | } else { |
mbed_official | 376:cb4d9db17537 | 335 | tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 376:cb4d9db17537 | 336 | } |
mbed_official | 376:cb4d9db17537 | 337 | |
mbed_official | 376:cb4d9db17537 | 338 | // Set new mode |
mbed_official | 376:cb4d9db17537 | 339 | i2c->OAR1 = tmpreg; |
mbed_official | 376:cb4d9db17537 | 340 | |
mbed_official | 376:cb4d9db17537 | 341 | } |
mbed_official | 376:cb4d9db17537 | 342 | |
mbed_official | 376:cb4d9db17537 | 343 | // See I2CSlave.h |
mbed_official | 376:cb4d9db17537 | 344 | #define NoData 0 // the slave has not been addressed |
mbed_official | 376:cb4d9db17537 | 345 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 376:cb4d9db17537 | 346 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 376:cb4d9db17537 | 347 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 376:cb4d9db17537 | 348 | |
mbed_official | 439:c4382fcbbaed | 349 | int i2c_slave_receive(i2c_t *obj) |
mbed_official | 439:c4382fcbbaed | 350 | { |
mbed_official | 376:cb4d9db17537 | 351 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 352 | int retValue = NoData; |
mbed_official | 376:cb4d9db17537 | 353 | |
mbed_official | 376:cb4d9db17537 | 354 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) { |
mbed_official | 376:cb4d9db17537 | 355 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) { |
mbed_official | 376:cb4d9db17537 | 356 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1) |
mbed_official | 376:cb4d9db17537 | 357 | retValue = ReadAddressed; |
mbed_official | 376:cb4d9db17537 | 358 | else |
mbed_official | 376:cb4d9db17537 | 359 | retValue = WriteAddressed; |
mbed_official | 376:cb4d9db17537 | 360 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR); |
mbed_official | 376:cb4d9db17537 | 361 | } |
mbed_official | 376:cb4d9db17537 | 362 | } |
mbed_official | 376:cb4d9db17537 | 363 | |
mbed_official | 376:cb4d9db17537 | 364 | return (retValue); |
mbed_official | 376:cb4d9db17537 | 365 | } |
mbed_official | 376:cb4d9db17537 | 366 | |
mbed_official | 439:c4382fcbbaed | 367 | int i2c_slave_read(i2c_t *obj, char *data, int length) |
mbed_official | 439:c4382fcbbaed | 368 | { |
mbed_official | 376:cb4d9db17537 | 369 | char size = 0; |
mbed_official | 376:cb4d9db17537 | 370 | |
mbed_official | 376:cb4d9db17537 | 371 | while (size < length) data[size++] = (char)i2c_byte_read(obj, 0); |
mbed_official | 376:cb4d9db17537 | 372 | |
mbed_official | 376:cb4d9db17537 | 373 | return size; |
mbed_official | 376:cb4d9db17537 | 374 | } |
mbed_official | 376:cb4d9db17537 | 375 | |
mbed_official | 439:c4382fcbbaed | 376 | int i2c_slave_write(i2c_t *obj, const char *data, int length) |
mbed_official | 439:c4382fcbbaed | 377 | { |
mbed_official | 376:cb4d9db17537 | 378 | char size = 0; |
mbed_official | 376:cb4d9db17537 | 379 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 376:cb4d9db17537 | 380 | |
mbed_official | 376:cb4d9db17537 | 381 | do { |
mbed_official | 376:cb4d9db17537 | 382 | i2c_byte_write(obj, data[size]); |
mbed_official | 376:cb4d9db17537 | 383 | size++; |
mbed_official | 376:cb4d9db17537 | 384 | } while (size < length); |
mbed_official | 376:cb4d9db17537 | 385 | |
mbed_official | 376:cb4d9db17537 | 386 | return size; |
mbed_official | 376:cb4d9db17537 | 387 | } |
mbed_official | 376:cb4d9db17537 | 388 | |
mbed_official | 376:cb4d9db17537 | 389 | |
mbed_official | 376:cb4d9db17537 | 390 | #endif // DEVICE_I2CSLAVE |
mbed_official | 376:cb4d9db17537 | 391 | |
mbed_official | 376:cb4d9db17537 | 392 | #endif // DEVICE_I2C |