mbed library sources(for async_print)
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_STM32F7/i2c_api.c@582:a89625bcd809, 2015-07-06 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Jul 06 09:00:34 2015 +0100
- Revision:
- 582:a89625bcd809
- Parent:
- 573:ad23fe03a082
Synchronized with git revision 45004fb61e4af8f74f4e916318df5207fcf6076d
Full URL: https://github.com/mbedmicro/mbed/commit/45004fb61e4af8f74f4e916318df5207fcf6076d/
DISCO_F746NG - Fix several issues
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 573:ad23fe03a082 | 1 | /* mbed Microcontroller Library |
mbed_official | 573:ad23fe03a082 | 2 | ******************************************************************************* |
mbed_official | 573:ad23fe03a082 | 3 | * Copyright (c) 2015, STMicroelectronics |
mbed_official | 573:ad23fe03a082 | 4 | * All rights reserved. |
mbed_official | 573:ad23fe03a082 | 5 | * |
mbed_official | 573:ad23fe03a082 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 573:ad23fe03a082 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 573:ad23fe03a082 | 8 | * |
mbed_official | 573:ad23fe03a082 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 573:ad23fe03a082 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 573:ad23fe03a082 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 573:ad23fe03a082 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 573:ad23fe03a082 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 573:ad23fe03a082 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 573:ad23fe03a082 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 573:ad23fe03a082 | 16 | * without specific prior written permission. |
mbed_official | 573:ad23fe03a082 | 17 | * |
mbed_official | 573:ad23fe03a082 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 573:ad23fe03a082 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 573:ad23fe03a082 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 573:ad23fe03a082 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 573:ad23fe03a082 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 573:ad23fe03a082 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 573:ad23fe03a082 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 573:ad23fe03a082 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 573:ad23fe03a082 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 573:ad23fe03a082 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 573:ad23fe03a082 | 28 | ******************************************************************************* |
mbed_official | 573:ad23fe03a082 | 29 | */ |
mbed_official | 573:ad23fe03a082 | 30 | #include "mbed_assert.h" |
mbed_official | 573:ad23fe03a082 | 31 | #include "i2c_api.h" |
mbed_official | 573:ad23fe03a082 | 32 | |
mbed_official | 573:ad23fe03a082 | 33 | #if DEVICE_I2C |
mbed_official | 573:ad23fe03a082 | 34 | |
mbed_official | 573:ad23fe03a082 | 35 | #include "cmsis.h" |
mbed_official | 573:ad23fe03a082 | 36 | #include "pinmap.h" |
mbed_official | 573:ad23fe03a082 | 37 | #include "PeripheralPins.h" |
mbed_official | 582:a89625bcd809 | 38 | #include "mbed_error.h" |
mbed_official | 573:ad23fe03a082 | 39 | |
mbed_official | 573:ad23fe03a082 | 40 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 573:ad23fe03a082 | 41 | not based on accurate values, they just guarantee that the application will |
mbed_official | 573:ad23fe03a082 | 42 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 582:a89625bcd809 | 43 | #define FLAG_TIMEOUT ((int)0x4000) |
mbed_official | 573:ad23fe03a082 | 44 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 573:ad23fe03a082 | 45 | |
mbed_official | 573:ad23fe03a082 | 46 | I2C_HandleTypeDef I2cHandle; |
mbed_official | 573:ad23fe03a082 | 47 | |
mbed_official | 573:ad23fe03a082 | 48 | int i2c1_inited = 0; |
mbed_official | 582:a89625bcd809 | 49 | /* Ready for next F7 devices |
mbed_official | 573:ad23fe03a082 | 50 | int i2c2_inited = 0; |
mbed_official | 573:ad23fe03a082 | 51 | int i2c3_inited = 0; |
mbed_official | 582:a89625bcd809 | 52 | int i2c4_inited = 0; |
mbed_official | 582:a89625bcd809 | 53 | */ |
mbed_official | 573:ad23fe03a082 | 54 | |
mbed_official | 573:ad23fe03a082 | 55 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
mbed_official | 573:ad23fe03a082 | 56 | { |
mbed_official | 573:ad23fe03a082 | 57 | // Determine the I2C to use |
mbed_official | 573:ad23fe03a082 | 58 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 573:ad23fe03a082 | 59 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 573:ad23fe03a082 | 60 | |
mbed_official | 573:ad23fe03a082 | 61 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 573:ad23fe03a082 | 62 | MBED_ASSERT(obj->i2c != (I2CName)NC); |
mbed_official | 573:ad23fe03a082 | 63 | |
mbed_official | 582:a89625bcd809 | 64 | // Enable I2C clock and pinout if not done |
mbed_official | 573:ad23fe03a082 | 65 | if ((obj->i2c == I2C_1) && !i2c1_inited) { |
mbed_official | 573:ad23fe03a082 | 66 | i2c1_inited = 1; |
mbed_official | 582:a89625bcd809 | 67 | __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_PCLK1); |
mbed_official | 582:a89625bcd809 | 68 | __HAL_RCC_I2C1_CLK_ENABLE(); |
mbed_official | 582:a89625bcd809 | 69 | // Configure I2C1 pins |
mbed_official | 573:ad23fe03a082 | 70 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 573:ad23fe03a082 | 71 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 573:ad23fe03a082 | 72 | pin_mode(sda, OpenDrain); |
mbed_official | 573:ad23fe03a082 | 73 | pin_mode(scl, OpenDrain); |
mbed_official | 573:ad23fe03a082 | 74 | } |
mbed_official | 573:ad23fe03a082 | 75 | |
mbed_official | 582:a89625bcd809 | 76 | /* Ready for next F7 devices |
mbed_official | 582:a89625bcd809 | 77 | #if defined(I2C2_BASE) |
mbed_official | 582:a89625bcd809 | 78 | if ((obj->i2c == I2C_2) && !i2c2_inited) { |
mbed_official | 582:a89625bcd809 | 79 | i2c2_inited = 1; |
mbed_official | 582:a89625bcd809 | 80 | __HAL_RCC_I2C2_CONFIG(RCC_I2C2CLKSOURCE_PCLK1); |
mbed_official | 582:a89625bcd809 | 81 | __HAL_RCC_I2C2_CLK_ENABLE(); |
mbed_official | 582:a89625bcd809 | 82 | // Configure I2C2 pins |
mbed_official | 582:a89625bcd809 | 83 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 582:a89625bcd809 | 84 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 582:a89625bcd809 | 85 | pin_mode(sda, OpenDrain); |
mbed_official | 582:a89625bcd809 | 86 | pin_mode(scl, OpenDrain); |
mbed_official | 582:a89625bcd809 | 87 | } |
mbed_official | 582:a89625bcd809 | 88 | #endif |
mbed_official | 582:a89625bcd809 | 89 | |
mbed_official | 582:a89625bcd809 | 90 | #if defined(I2C3_BASE) |
mbed_official | 582:a89625bcd809 | 91 | if ((obj->i2c == I2C_3) && !i2c3_inited) { |
mbed_official | 582:a89625bcd809 | 92 | i2c3_inited = 1; |
mbed_official | 582:a89625bcd809 | 93 | __HAL_RCC_I2C3_CONFIG(RCC_I2C3CLKSOURCE_PCLK1); |
mbed_official | 582:a89625bcd809 | 94 | __HAL_RCC_I2C3_CLK_ENABLE(); |
mbed_official | 582:a89625bcd809 | 95 | // Configure I2C3 pins |
mbed_official | 582:a89625bcd809 | 96 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 582:a89625bcd809 | 97 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 582:a89625bcd809 | 98 | pin_mode(sda, OpenDrain); |
mbed_official | 582:a89625bcd809 | 99 | pin_mode(scl, OpenDrain); |
mbed_official | 582:a89625bcd809 | 100 | } |
mbed_official | 582:a89625bcd809 | 101 | #endif |
mbed_official | 582:a89625bcd809 | 102 | |
mbed_official | 582:a89625bcd809 | 103 | #if defined(I2C4_BASE) |
mbed_official | 582:a89625bcd809 | 104 | if ((obj->i2c == I2C_4) && !i2c4_inited) { |
mbed_official | 582:a89625bcd809 | 105 | i2c4_inited = 1; |
mbed_official | 582:a89625bcd809 | 106 | __HAL_RCC_I2C4_CONFIG(RCC_I2C4CLKSOURCE_PCLK1); |
mbed_official | 582:a89625bcd809 | 107 | __HAL_RCC_I2C4_CLK_ENABLE(); |
mbed_official | 582:a89625bcd809 | 108 | // Configure I2C4 pins |
mbed_official | 582:a89625bcd809 | 109 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 582:a89625bcd809 | 110 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 582:a89625bcd809 | 111 | pin_mode(sda, OpenDrain); |
mbed_official | 582:a89625bcd809 | 112 | pin_mode(scl, OpenDrain); |
mbed_official | 582:a89625bcd809 | 113 | } |
mbed_official | 582:a89625bcd809 | 114 | #endif |
mbed_official | 582:a89625bcd809 | 115 | */ |
mbed_official | 582:a89625bcd809 | 116 | |
mbed_official | 573:ad23fe03a082 | 117 | // Reset to clear pending flags if any |
mbed_official | 573:ad23fe03a082 | 118 | i2c_reset(obj); |
mbed_official | 573:ad23fe03a082 | 119 | |
mbed_official | 573:ad23fe03a082 | 120 | // I2C configuration |
mbed_official | 573:ad23fe03a082 | 121 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 573:ad23fe03a082 | 122 | } |
mbed_official | 573:ad23fe03a082 | 123 | |
mbed_official | 573:ad23fe03a082 | 124 | void i2c_frequency(i2c_t *obj, int hz) |
mbed_official | 573:ad23fe03a082 | 125 | { |
mbed_official | 582:a89625bcd809 | 126 | uint32_t tim = 0; |
mbed_official | 582:a89625bcd809 | 127 | |
mbed_official | 582:a89625bcd809 | 128 | MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000)); |
mbed_official | 582:a89625bcd809 | 129 | |
mbed_official | 573:ad23fe03a082 | 130 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 131 | int timeout; |
mbed_official | 573:ad23fe03a082 | 132 | |
mbed_official | 573:ad23fe03a082 | 133 | // wait before init |
mbed_official | 573:ad23fe03a082 | 134 | timeout = LONG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 135 | while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)) {} |
mbed_official | 582:a89625bcd809 | 136 | |
mbed_official | 582:a89625bcd809 | 137 | /* |
mbed_official | 582:a89625bcd809 | 138 | Values calculated with I2C_Timing_Configuration tool (excel file) |
mbed_official | 582:a89625bcd809 | 139 | * Standard mode (up to 100 kHz) |
mbed_official | 582:a89625bcd809 | 140 | * Fast Mode (up to 400 kHz) |
mbed_official | 582:a89625bcd809 | 141 | * Fast Mode Plus (up to 1 MHz) |
mbed_official | 582:a89625bcd809 | 142 | Below values obtained with: |
mbed_official | 582:a89625bcd809 | 143 | - I2Cx clock source = APB1CLK = 54 MHz |
mbed_official | 582:a89625bcd809 | 144 | - Analog filter delay = ON |
mbed_official | 582:a89625bcd809 | 145 | - Digital filter coefficient = 0 |
mbed_official | 582:a89625bcd809 | 146 | */ |
mbed_official | 582:a89625bcd809 | 147 | switch (hz) { |
mbed_official | 582:a89625bcd809 | 148 | case 100000: |
mbed_official | 582:a89625bcd809 | 149 | tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 582:a89625bcd809 | 150 | break; |
mbed_official | 582:a89625bcd809 | 151 | case 400000: |
mbed_official | 582:a89625bcd809 | 152 | tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 582:a89625bcd809 | 153 | break; |
mbed_official | 582:a89625bcd809 | 154 | case 1000000: |
mbed_official | 582:a89625bcd809 | 155 | tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns |
mbed_official | 582:a89625bcd809 | 156 | break; |
mbed_official | 582:a89625bcd809 | 157 | default: |
mbed_official | 582:a89625bcd809 | 158 | break; |
mbed_official | 582:a89625bcd809 | 159 | } |
mbed_official | 573:ad23fe03a082 | 160 | |
mbed_official | 573:ad23fe03a082 | 161 | // I2C configuration |
mbed_official | 582:a89625bcd809 | 162 | I2cHandle.Init.Timing = tim; |
mbed_official | 582:a89625bcd809 | 163 | I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; |
mbed_official | 582:a89625bcd809 | 164 | I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; |
mbed_official | 582:a89625bcd809 | 165 | I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; |
mbed_official | 582:a89625bcd809 | 166 | I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; |
mbed_official | 582:a89625bcd809 | 167 | I2cHandle.Init.OwnAddress1 = 0; |
mbed_official | 582:a89625bcd809 | 168 | I2cHandle.Init.OwnAddress2 = 0; |
mbed_official | 582:a89625bcd809 | 169 | I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK; |
mbed_official | 582:a89625bcd809 | 170 | |
mbed_official | 582:a89625bcd809 | 171 | if (HAL_I2C_Init(&I2cHandle) != HAL_OK) { |
mbed_official | 582:a89625bcd809 | 172 | error("Cannot initialize I2C"); |
mbed_official | 573:ad23fe03a082 | 173 | } |
mbed_official | 573:ad23fe03a082 | 174 | } |
mbed_official | 573:ad23fe03a082 | 175 | |
mbed_official | 573:ad23fe03a082 | 176 | inline int i2c_start(i2c_t *obj) |
mbed_official | 573:ad23fe03a082 | 177 | { |
mbed_official | 573:ad23fe03a082 | 178 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 179 | int timeout; |
mbed_official | 573:ad23fe03a082 | 180 | |
mbed_official | 573:ad23fe03a082 | 181 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 182 | |
mbed_official | 573:ad23fe03a082 | 183 | // Clear Acknowledge failure flag |
mbed_official | 573:ad23fe03a082 | 184 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF); |
mbed_official | 573:ad23fe03a082 | 185 | |
mbed_official | 573:ad23fe03a082 | 186 | // Generate the START condition |
mbed_official | 582:a89625bcd809 | 187 | i2c->CR2 |= I2C_CR2_START; |
mbed_official | 573:ad23fe03a082 | 188 | |
mbed_official | 573:ad23fe03a082 | 189 | // Wait the START condition has been correctly sent |
mbed_official | 573:ad23fe03a082 | 190 | timeout = FLAG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 191 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) { |
mbed_official | 573:ad23fe03a082 | 192 | if ((timeout--) == 0) { |
mbed_official | 573:ad23fe03a082 | 193 | return 1; |
mbed_official | 573:ad23fe03a082 | 194 | } |
mbed_official | 573:ad23fe03a082 | 195 | } |
mbed_official | 573:ad23fe03a082 | 196 | |
mbed_official | 573:ad23fe03a082 | 197 | return 0; |
mbed_official | 573:ad23fe03a082 | 198 | } |
mbed_official | 573:ad23fe03a082 | 199 | |
mbed_official | 573:ad23fe03a082 | 200 | inline int i2c_stop(i2c_t *obj) |
mbed_official | 573:ad23fe03a082 | 201 | { |
mbed_official | 573:ad23fe03a082 | 202 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 203 | |
mbed_official | 573:ad23fe03a082 | 204 | // Generate the STOP condition |
mbed_official | 582:a89625bcd809 | 205 | i2c->CR2 |= I2C_CR2_STOP; |
mbed_official | 573:ad23fe03a082 | 206 | |
mbed_official | 573:ad23fe03a082 | 207 | return 0; |
mbed_official | 573:ad23fe03a082 | 208 | } |
mbed_official | 573:ad23fe03a082 | 209 | |
mbed_official | 573:ad23fe03a082 | 210 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
mbed_official | 573:ad23fe03a082 | 211 | { |
mbed_official | 573:ad23fe03a082 | 212 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 213 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 214 | int timeout; |
mbed_official | 573:ad23fe03a082 | 215 | int count; |
mbed_official | 573:ad23fe03a082 | 216 | int value; |
mbed_official | 573:ad23fe03a082 | 217 | |
mbed_official | 582:a89625bcd809 | 218 | /* update CR2 register */ |
mbed_official | 582:a89625bcd809 | 219 | 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 | 582:a89625bcd809 | 220 | | (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 | 573:ad23fe03a082 | 221 | |
mbed_official | 582:a89625bcd809 | 222 | // Read all bytes |
mbed_official | 582:a89625bcd809 | 223 | for (count = 0; count < length; count++) { |
mbed_official | 582:a89625bcd809 | 224 | value = i2c_byte_read(obj, 0); |
mbed_official | 582:a89625bcd809 | 225 | data[count] = (char)value; |
mbed_official | 582:a89625bcd809 | 226 | } |
mbed_official | 582:a89625bcd809 | 227 | |
mbed_official | 582:a89625bcd809 | 228 | // Wait transfer complete |
mbed_official | 582:a89625bcd809 | 229 | timeout = LONG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 230 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 573:ad23fe03a082 | 231 | timeout--; |
mbed_official | 573:ad23fe03a082 | 232 | if (timeout == 0) { |
mbed_official | 573:ad23fe03a082 | 233 | return -1; |
mbed_official | 573:ad23fe03a082 | 234 | } |
mbed_official | 573:ad23fe03a082 | 235 | } |
mbed_official | 573:ad23fe03a082 | 236 | |
mbed_official | 582:a89625bcd809 | 237 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 573:ad23fe03a082 | 238 | |
mbed_official | 573:ad23fe03a082 | 239 | // If not repeated start, send stop. |
mbed_official | 573:ad23fe03a082 | 240 | if (stop) { |
mbed_official | 573:ad23fe03a082 | 241 | i2c_stop(obj); |
mbed_official | 582:a89625bcd809 | 242 | /* Wait until STOPF flag is set */ |
mbed_official | 582:a89625bcd809 | 243 | timeout = FLAG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 244 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 582:a89625bcd809 | 245 | timeout--; |
mbed_official | 582:a89625bcd809 | 246 | if (timeout == 0) { |
mbed_official | 582:a89625bcd809 | 247 | return -1; |
mbed_official | 582:a89625bcd809 | 248 | } |
mbed_official | 582:a89625bcd809 | 249 | } |
mbed_official | 582:a89625bcd809 | 250 | /* Clear STOP Flag */ |
mbed_official | 582:a89625bcd809 | 251 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 573:ad23fe03a082 | 252 | } |
mbed_official | 573:ad23fe03a082 | 253 | |
mbed_official | 573:ad23fe03a082 | 254 | return length; |
mbed_official | 573:ad23fe03a082 | 255 | } |
mbed_official | 573:ad23fe03a082 | 256 | |
mbed_official | 573:ad23fe03a082 | 257 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
mbed_official | 573:ad23fe03a082 | 258 | { |
mbed_official | 573:ad23fe03a082 | 259 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 260 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 261 | int timeout; |
mbed_official | 573:ad23fe03a082 | 262 | int count; |
mbed_official | 573:ad23fe03a082 | 263 | |
mbed_official | 582:a89625bcd809 | 264 | /* update CR2 register */ |
mbed_official | 582:a89625bcd809 | 265 | 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 | 582:a89625bcd809 | 266 | | (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 | 573:ad23fe03a082 | 267 | |
mbed_official | 582:a89625bcd809 | 268 | for (count = 0; count < length; count++) { |
mbed_official | 582:a89625bcd809 | 269 | i2c_byte_write(obj, data[count]); |
mbed_official | 582:a89625bcd809 | 270 | } |
mbed_official | 582:a89625bcd809 | 271 | |
mbed_official | 582:a89625bcd809 | 272 | // Wait transfer complete |
mbed_official | 573:ad23fe03a082 | 273 | timeout = FLAG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 274 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 573:ad23fe03a082 | 275 | timeout--; |
mbed_official | 573:ad23fe03a082 | 276 | if (timeout == 0) { |
mbed_official | 573:ad23fe03a082 | 277 | return -1; |
mbed_official | 573:ad23fe03a082 | 278 | } |
mbed_official | 573:ad23fe03a082 | 279 | } |
mbed_official | 573:ad23fe03a082 | 280 | |
mbed_official | 582:a89625bcd809 | 281 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 573:ad23fe03a082 | 282 | |
mbed_official | 573:ad23fe03a082 | 283 | // If not repeated start, send stop. |
mbed_official | 573:ad23fe03a082 | 284 | if (stop) { |
mbed_official | 573:ad23fe03a082 | 285 | i2c_stop(obj); |
mbed_official | 582:a89625bcd809 | 286 | /* Wait until STOPF flag is set */ |
mbed_official | 582:a89625bcd809 | 287 | timeout = FLAG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 288 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 582:a89625bcd809 | 289 | timeout--; |
mbed_official | 582:a89625bcd809 | 290 | if (timeout == 0) { |
mbed_official | 582:a89625bcd809 | 291 | return -1; |
mbed_official | 582:a89625bcd809 | 292 | } |
mbed_official | 582:a89625bcd809 | 293 | } |
mbed_official | 582:a89625bcd809 | 294 | /* Clear STOP Flag */ |
mbed_official | 582:a89625bcd809 | 295 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 573:ad23fe03a082 | 296 | } |
mbed_official | 573:ad23fe03a082 | 297 | |
mbed_official | 573:ad23fe03a082 | 298 | return count; |
mbed_official | 573:ad23fe03a082 | 299 | } |
mbed_official | 573:ad23fe03a082 | 300 | |
mbed_official | 573:ad23fe03a082 | 301 | int i2c_byte_read(i2c_t *obj, int last) |
mbed_official | 573:ad23fe03a082 | 302 | { |
mbed_official | 573:ad23fe03a082 | 303 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 304 | int timeout; |
mbed_official | 573:ad23fe03a082 | 305 | |
mbed_official | 573:ad23fe03a082 | 306 | // Wait until the byte is received |
mbed_official | 573:ad23fe03a082 | 307 | timeout = FLAG_TIMEOUT; |
mbed_official | 573:ad23fe03a082 | 308 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 573:ad23fe03a082 | 309 | if ((timeout--) == 0) { |
mbed_official | 573:ad23fe03a082 | 310 | return -1; |
mbed_official | 573:ad23fe03a082 | 311 | } |
mbed_official | 573:ad23fe03a082 | 312 | } |
mbed_official | 573:ad23fe03a082 | 313 | |
mbed_official | 582:a89625bcd809 | 314 | return (int)i2c->RXDR; |
mbed_official | 573:ad23fe03a082 | 315 | } |
mbed_official | 573:ad23fe03a082 | 316 | |
mbed_official | 573:ad23fe03a082 | 317 | int i2c_byte_write(i2c_t *obj, int data) |
mbed_official | 573:ad23fe03a082 | 318 | { |
mbed_official | 573:ad23fe03a082 | 319 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 320 | int timeout; |
mbed_official | 573:ad23fe03a082 | 321 | |
mbed_official | 582:a89625bcd809 | 322 | // Wait until the previous byte is transmitted |
mbed_official | 573:ad23fe03a082 | 323 | timeout = FLAG_TIMEOUT; |
mbed_official | 582:a89625bcd809 | 324 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) { |
mbed_official | 573:ad23fe03a082 | 325 | if ((timeout--) == 0) { |
mbed_official | 573:ad23fe03a082 | 326 | return 0; |
mbed_official | 573:ad23fe03a082 | 327 | } |
mbed_official | 573:ad23fe03a082 | 328 | } |
mbed_official | 573:ad23fe03a082 | 329 | |
mbed_official | 582:a89625bcd809 | 330 | i2c->TXDR = (uint8_t)data; |
mbed_official | 582:a89625bcd809 | 331 | |
mbed_official | 573:ad23fe03a082 | 332 | return 1; |
mbed_official | 573:ad23fe03a082 | 333 | } |
mbed_official | 573:ad23fe03a082 | 334 | |
mbed_official | 573:ad23fe03a082 | 335 | void i2c_reset(i2c_t *obj) |
mbed_official | 573:ad23fe03a082 | 336 | { |
mbed_official | 573:ad23fe03a082 | 337 | int timeout; |
mbed_official | 573:ad23fe03a082 | 338 | |
mbed_official | 573:ad23fe03a082 | 339 | // wait before reset |
mbed_official | 573:ad23fe03a082 | 340 | timeout = LONG_TIMEOUT; |
mbed_official | 573:ad23fe03a082 | 341 | while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); |
mbed_official | 573:ad23fe03a082 | 342 | |
mbed_official | 582:a89625bcd809 | 343 | __I2C1_FORCE_RESET(); |
mbed_official | 582:a89625bcd809 | 344 | __I2C1_RELEASE_RESET(); |
mbed_official | 573:ad23fe03a082 | 345 | } |
mbed_official | 573:ad23fe03a082 | 346 | |
mbed_official | 573:ad23fe03a082 | 347 | #if DEVICE_I2CSLAVE |
mbed_official | 573:ad23fe03a082 | 348 | |
mbed_official | 573:ad23fe03a082 | 349 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) |
mbed_official | 573:ad23fe03a082 | 350 | { |
mbed_official | 573:ad23fe03a082 | 351 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 582:a89625bcd809 | 352 | uint16_t tmpreg; |
mbed_official | 573:ad23fe03a082 | 353 | |
mbed_official | 582:a89625bcd809 | 354 | // disable |
mbed_official | 582:a89625bcd809 | 355 | i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 573:ad23fe03a082 | 356 | // Get the old register value |
mbed_official | 573:ad23fe03a082 | 357 | tmpreg = i2c->OAR1; |
mbed_official | 573:ad23fe03a082 | 358 | // Reset address bits |
mbed_official | 573:ad23fe03a082 | 359 | tmpreg &= 0xFC00; |
mbed_official | 573:ad23fe03a082 | 360 | // Set new address |
mbed_official | 573:ad23fe03a082 | 361 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 573:ad23fe03a082 | 362 | // Store the new register value |
mbed_official | 573:ad23fe03a082 | 363 | i2c->OAR1 = tmpreg; |
mbed_official | 582:a89625bcd809 | 364 | // enable |
mbed_official | 582:a89625bcd809 | 365 | i2c->OAR1 |= I2C_OAR1_OA1EN; |
mbed_official | 573:ad23fe03a082 | 366 | } |
mbed_official | 573:ad23fe03a082 | 367 | |
mbed_official | 573:ad23fe03a082 | 368 | void i2c_slave_mode(i2c_t *obj, int enable_slave) |
mbed_official | 573:ad23fe03a082 | 369 | { |
mbed_official | 582:a89625bcd809 | 370 | |
mbed_official | 582:a89625bcd809 | 371 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 582:a89625bcd809 | 372 | uint16_t tmpreg; |
mbed_official | 582:a89625bcd809 | 373 | |
mbed_official | 582:a89625bcd809 | 374 | // Get the old register value |
mbed_official | 582:a89625bcd809 | 375 | tmpreg = i2c->OAR1; |
mbed_official | 582:a89625bcd809 | 376 | |
mbed_official | 582:a89625bcd809 | 377 | // Enable / disable slave |
mbed_official | 582:a89625bcd809 | 378 | if (enable_slave == 1) { |
mbed_official | 582:a89625bcd809 | 379 | tmpreg |= I2C_OAR1_OA1EN; |
mbed_official | 582:a89625bcd809 | 380 | } else { |
mbed_official | 582:a89625bcd809 | 381 | tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 573:ad23fe03a082 | 382 | } |
mbed_official | 582:a89625bcd809 | 383 | |
mbed_official | 582:a89625bcd809 | 384 | // Set new mode |
mbed_official | 582:a89625bcd809 | 385 | i2c->OAR1 = tmpreg; |
mbed_official | 582:a89625bcd809 | 386 | |
mbed_official | 573:ad23fe03a082 | 387 | } |
mbed_official | 573:ad23fe03a082 | 388 | |
mbed_official | 573:ad23fe03a082 | 389 | // See I2CSlave.h |
mbed_official | 573:ad23fe03a082 | 390 | #define NoData 0 // the slave has not been addressed |
mbed_official | 573:ad23fe03a082 | 391 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 573:ad23fe03a082 | 392 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 573:ad23fe03a082 | 393 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 573:ad23fe03a082 | 394 | |
mbed_official | 573:ad23fe03a082 | 395 | int i2c_slave_receive(i2c_t *obj) |
mbed_official | 573:ad23fe03a082 | 396 | { |
mbed_official | 582:a89625bcd809 | 397 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 398 | int retValue = NoData; |
mbed_official | 573:ad23fe03a082 | 399 | |
mbed_official | 573:ad23fe03a082 | 400 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) { |
mbed_official | 573:ad23fe03a082 | 401 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) { |
mbed_official | 582:a89625bcd809 | 402 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1) |
mbed_official | 573:ad23fe03a082 | 403 | retValue = ReadAddressed; |
mbed_official | 573:ad23fe03a082 | 404 | else |
mbed_official | 573:ad23fe03a082 | 405 | retValue = WriteAddressed; |
mbed_official | 573:ad23fe03a082 | 406 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR); |
mbed_official | 573:ad23fe03a082 | 407 | } |
mbed_official | 573:ad23fe03a082 | 408 | } |
mbed_official | 573:ad23fe03a082 | 409 | |
mbed_official | 573:ad23fe03a082 | 410 | return (retValue); |
mbed_official | 573:ad23fe03a082 | 411 | } |
mbed_official | 573:ad23fe03a082 | 412 | |
mbed_official | 573:ad23fe03a082 | 413 | int i2c_slave_read(i2c_t *obj, char *data, int length) |
mbed_official | 573:ad23fe03a082 | 414 | { |
mbed_official | 582:a89625bcd809 | 415 | char size = 0; |
mbed_official | 573:ad23fe03a082 | 416 | |
mbed_official | 582:a89625bcd809 | 417 | while (size < length) data[size++] = (char)i2c_byte_read(obj, 0); |
mbed_official | 573:ad23fe03a082 | 418 | |
mbed_official | 573:ad23fe03a082 | 419 | return size; |
mbed_official | 573:ad23fe03a082 | 420 | } |
mbed_official | 573:ad23fe03a082 | 421 | |
mbed_official | 573:ad23fe03a082 | 422 | int i2c_slave_write(i2c_t *obj, const char *data, int length) |
mbed_official | 573:ad23fe03a082 | 423 | { |
mbed_official | 582:a89625bcd809 | 424 | char size = 0; |
mbed_official | 573:ad23fe03a082 | 425 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 573:ad23fe03a082 | 426 | |
mbed_official | 582:a89625bcd809 | 427 | do { |
mbed_official | 582:a89625bcd809 | 428 | i2c_byte_write(obj, data[size]); |
mbed_official | 573:ad23fe03a082 | 429 | size++; |
mbed_official | 582:a89625bcd809 | 430 | } while (size < length); |
mbed_official | 573:ad23fe03a082 | 431 | |
mbed_official | 573:ad23fe03a082 | 432 | return size; |
mbed_official | 573:ad23fe03a082 | 433 | } |
mbed_official | 573:ad23fe03a082 | 434 | |
mbed_official | 573:ad23fe03a082 | 435 | |
mbed_official | 573:ad23fe03a082 | 436 | #endif // DEVICE_I2CSLAVE |
mbed_official | 573:ad23fe03a082 | 437 | |
mbed_official | 573:ad23fe03a082 | 438 | #endif // DEVICE_I2C |