mbed library sources
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targets/hal/TARGET_STM/TARGET_NUCLEO_F334R8/i2c_api.c@305:1f0269907d8b, 2014-08-29 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Aug 29 20:45:07 2014 +0100
- Revision:
- 305:1f0269907d8b
- Parent:
- 272:949bd8bf133b
- Child:
- 402:09075a3b15e3
Synchronized with git revision f304c6ba83591678388024d30440e94781fa8d65
Full URL: https://github.com/mbedmicro/mbed/commit/f304c6ba83591678388024d30440e94781fa8d65/
[NUCLEOs] enhance i2c api
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 237:f3da66175598 | 1 | /* mbed Microcontroller Library |
mbed_official | 237:f3da66175598 | 2 | ******************************************************************************* |
mbed_official | 237:f3da66175598 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 237:f3da66175598 | 4 | * All rights reserved. |
mbed_official | 237:f3da66175598 | 5 | * |
mbed_official | 237:f3da66175598 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 237:f3da66175598 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 237:f3da66175598 | 8 | * |
mbed_official | 237:f3da66175598 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 237:f3da66175598 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 237:f3da66175598 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 237:f3da66175598 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 237:f3da66175598 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 237:f3da66175598 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 237:f3da66175598 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 237:f3da66175598 | 16 | * without specific prior written permission. |
mbed_official | 237:f3da66175598 | 17 | * |
mbed_official | 237:f3da66175598 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 237:f3da66175598 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 237:f3da66175598 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 237:f3da66175598 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 237:f3da66175598 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 237:f3da66175598 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 237:f3da66175598 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 237:f3da66175598 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 237:f3da66175598 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 237:f3da66175598 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 237:f3da66175598 | 28 | ******************************************************************************* |
mbed_official | 237:f3da66175598 | 29 | */ |
mbed_official | 237:f3da66175598 | 30 | #include "mbed_assert.h" |
mbed_official | 237:f3da66175598 | 31 | #include "i2c_api.h" |
mbed_official | 237:f3da66175598 | 32 | |
mbed_official | 237:f3da66175598 | 33 | #if DEVICE_I2C |
mbed_official | 237:f3da66175598 | 34 | |
mbed_official | 237:f3da66175598 | 35 | #include "cmsis.h" |
mbed_official | 237:f3da66175598 | 36 | #include "pinmap.h" |
mbed_official | 237:f3da66175598 | 37 | |
mbed_official | 237:f3da66175598 | 38 | /* Timeout values for flags and events waiting loops. These timeouts are |
mbed_official | 237:f3da66175598 | 39 | not based on accurate values, they just guarantee that the application will |
mbed_official | 237:f3da66175598 | 40 | not remain stuck if the I2C communication is corrupted. */ |
mbed_official | 237:f3da66175598 | 41 | #define FLAG_TIMEOUT ((int)0x4000) |
mbed_official | 237:f3da66175598 | 42 | #define LONG_TIMEOUT ((int)0x8000) |
mbed_official | 237:f3da66175598 | 43 | |
mbed_official | 237:f3da66175598 | 44 | static const PinMap PinMap_I2C_SDA[] = { |
mbed_official | 237:f3da66175598 | 45 | {PA_14, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 46 | {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 47 | {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 48 | {NC, NC, 0} |
mbed_official | 237:f3da66175598 | 49 | }; |
mbed_official | 237:f3da66175598 | 50 | |
mbed_official | 237:f3da66175598 | 51 | static const PinMap PinMap_I2C_SCL[] = { |
mbed_official | 237:f3da66175598 | 52 | {PA_15, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 53 | {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 54 | {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, |
mbed_official | 237:f3da66175598 | 55 | {NC, NC, 0} |
mbed_official | 237:f3da66175598 | 56 | }; |
mbed_official | 237:f3da66175598 | 57 | |
mbed_official | 237:f3da66175598 | 58 | I2C_HandleTypeDef I2cHandle; |
mbed_official | 237:f3da66175598 | 59 | |
mbed_official | 305:1f0269907d8b | 60 | int i2c1_inited = 0; |
mbed_official | 305:1f0269907d8b | 61 | |
mbed_official | 305:1f0269907d8b | 62 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) { |
mbed_official | 237:f3da66175598 | 63 | // Determine the I2C to use |
mbed_official | 237:f3da66175598 | 64 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
mbed_official | 237:f3da66175598 | 65 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
mbed_official | 237:f3da66175598 | 66 | |
mbed_official | 237:f3da66175598 | 67 | obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
mbed_official | 237:f3da66175598 | 68 | MBED_ASSERT(obj->i2c != (I2CName)NC); |
mbed_official | 237:f3da66175598 | 69 | |
mbed_official | 305:1f0269907d8b | 70 | // Enable I2C1 clock and pinout if not done |
mbed_official | 305:1f0269907d8b | 71 | if ((obj->i2c == I2C_1)&& !i2c1_inited) { |
mbed_official | 305:1f0269907d8b | 72 | i2c1_inited = 1; |
mbed_official | 305:1f0269907d8b | 73 | __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK); |
mbed_official | 305:1f0269907d8b | 74 | __I2C1_CLK_ENABLE(); |
mbed_official | 305:1f0269907d8b | 75 | // Configure I2C pins |
mbed_official | 305:1f0269907d8b | 76 | pinmap_pinout(sda, PinMap_I2C_SDA); |
mbed_official | 305:1f0269907d8b | 77 | pinmap_pinout(scl, PinMap_I2C_SCL); |
mbed_official | 305:1f0269907d8b | 78 | pin_mode(sda, OpenDrain); |
mbed_official | 305:1f0269907d8b | 79 | pin_mode(scl, OpenDrain); |
mbed_official | 305:1f0269907d8b | 80 | } |
mbed_official | 237:f3da66175598 | 81 | |
mbed_official | 237:f3da66175598 | 82 | // Reset to clear pending flags if any |
mbed_official | 237:f3da66175598 | 83 | i2c_reset(obj); |
mbed_official | 237:f3da66175598 | 84 | |
mbed_official | 237:f3da66175598 | 85 | // I2C configuration |
mbed_official | 237:f3da66175598 | 86 | i2c_frequency(obj, 100000); // 100 kHz per default |
mbed_official | 237:f3da66175598 | 87 | } |
mbed_official | 237:f3da66175598 | 88 | |
mbed_official | 237:f3da66175598 | 89 | void i2c_frequency(i2c_t *obj, int hz) |
mbed_official | 237:f3da66175598 | 90 | { |
mbed_official | 237:f3da66175598 | 91 | uint32_t tim = 0; |
mbed_official | 237:f3da66175598 | 92 | |
mbed_official | 237:f3da66175598 | 93 | MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000)); |
mbed_official | 237:f3da66175598 | 94 | |
mbed_official | 237:f3da66175598 | 95 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 305:1f0269907d8b | 96 | int timeout; |
mbed_official | 305:1f0269907d8b | 97 | |
mbed_official | 305:1f0269907d8b | 98 | // wait before init |
mbed_official | 305:1f0269907d8b | 99 | timeout = LONG_TIMEOUT; |
mbed_official | 305:1f0269907d8b | 100 | while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); |
mbed_official | 237:f3da66175598 | 101 | |
mbed_official | 237:f3da66175598 | 102 | // Update the SystemCoreClock variable. |
mbed_official | 237:f3da66175598 | 103 | SystemCoreClockUpdate(); |
mbed_official | 237:f3da66175598 | 104 | |
mbed_official | 237:f3da66175598 | 105 | /* |
mbed_official | 237:f3da66175598 | 106 | Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235) |
mbed_official | 237:f3da66175598 | 107 | * Standard mode (up to 100 kHz) |
mbed_official | 237:f3da66175598 | 108 | * Fast Mode (up to 400 kHz) |
mbed_official | 237:f3da66175598 | 109 | * Fast Mode Plus (up to 1 MHz) |
mbed_official | 237:f3da66175598 | 110 | Below values obtained with: |
mbed_official | 237:f3da66175598 | 111 | - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE) |
mbed_official | 237:f3da66175598 | 112 | - Analog filter delay = ON |
mbed_official | 237:f3da66175598 | 113 | - Digital filter coefficient = 0 |
mbed_official | 237:f3da66175598 | 114 | */ |
mbed_official | 237:f3da66175598 | 115 | if (SystemCoreClock == 64000000) { |
mbed_official | 237:f3da66175598 | 116 | switch (hz) { |
mbed_official | 237:f3da66175598 | 117 | case 100000: |
mbed_official | 272:949bd8bf133b | 118 | tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 237:f3da66175598 | 119 | break; |
mbed_official | 237:f3da66175598 | 120 | case 400000: |
mbed_official | 272:949bd8bf133b | 121 | tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 237:f3da66175598 | 122 | break; |
mbed_official | 237:f3da66175598 | 123 | case 1000000: |
mbed_official | 272:949bd8bf133b | 124 | tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns |
mbed_official | 237:f3da66175598 | 125 | // Enable the Fast Mode Plus capability |
mbed_official | 237:f3da66175598 | 126 | __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1); |
mbed_official | 237:f3da66175598 | 127 | break; |
mbed_official | 237:f3da66175598 | 128 | default: |
mbed_official | 237:f3da66175598 | 129 | break; |
mbed_official | 237:f3da66175598 | 130 | } |
mbed_official | 237:f3da66175598 | 131 | } else if (SystemCoreClock == 72000000) { |
mbed_official | 237:f3da66175598 | 132 | switch (hz) { |
mbed_official | 237:f3da66175598 | 133 | case 100000: |
mbed_official | 272:949bd8bf133b | 134 | tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 237:f3da66175598 | 135 | break; |
mbed_official | 237:f3da66175598 | 136 | case 400000: |
mbed_official | 272:949bd8bf133b | 137 | tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns |
mbed_official | 237:f3da66175598 | 138 | break; |
mbed_official | 237:f3da66175598 | 139 | case 1000000: |
mbed_official | 272:949bd8bf133b | 140 | tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns |
mbed_official | 237:f3da66175598 | 141 | // Enable the Fast Mode Plus capability |
mbed_official | 237:f3da66175598 | 142 | __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1); |
mbed_official | 237:f3da66175598 | 143 | break; |
mbed_official | 237:f3da66175598 | 144 | default: |
mbed_official | 237:f3da66175598 | 145 | break; |
mbed_official | 237:f3da66175598 | 146 | } |
mbed_official | 237:f3da66175598 | 147 | } |
mbed_official | 237:f3da66175598 | 148 | |
mbed_official | 237:f3da66175598 | 149 | // I2C configuration |
mbed_official | 237:f3da66175598 | 150 | I2cHandle.Init.Timing = tim; |
mbed_official | 237:f3da66175598 | 151 | I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; |
mbed_official | 237:f3da66175598 | 152 | I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED; |
mbed_official | 237:f3da66175598 | 153 | I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED; |
mbed_official | 237:f3da66175598 | 154 | I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED; |
mbed_official | 237:f3da66175598 | 155 | I2cHandle.Init.OwnAddress1 = 0; |
mbed_official | 237:f3da66175598 | 156 | I2cHandle.Init.OwnAddress2 = 0; |
mbed_official | 237:f3da66175598 | 157 | I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK; |
mbed_official | 237:f3da66175598 | 158 | HAL_I2C_Init(&I2cHandle); |
mbed_official | 237:f3da66175598 | 159 | } |
mbed_official | 237:f3da66175598 | 160 | |
mbed_official | 237:f3da66175598 | 161 | inline int i2c_start(i2c_t *obj) |
mbed_official | 237:f3da66175598 | 162 | { |
mbed_official | 237:f3da66175598 | 163 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 164 | int timeout; |
mbed_official | 237:f3da66175598 | 165 | |
mbed_official | 237:f3da66175598 | 166 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 167 | |
mbed_official | 237:f3da66175598 | 168 | // Clear Acknowledge failure flag |
mbed_official | 237:f3da66175598 | 169 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF); |
mbed_official | 237:f3da66175598 | 170 | |
mbed_official | 237:f3da66175598 | 171 | // Generate the START condition |
mbed_official | 237:f3da66175598 | 172 | i2c->CR2 |= I2C_CR2_START; |
mbed_official | 237:f3da66175598 | 173 | |
mbed_official | 237:f3da66175598 | 174 | // Wait the START condition has been correctly sent |
mbed_official | 237:f3da66175598 | 175 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 176 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) { |
mbed_official | 237:f3da66175598 | 177 | if ((timeout--) == 0) { |
mbed_official | 237:f3da66175598 | 178 | return 1; |
mbed_official | 237:f3da66175598 | 179 | } |
mbed_official | 237:f3da66175598 | 180 | } |
mbed_official | 237:f3da66175598 | 181 | |
mbed_official | 237:f3da66175598 | 182 | return 0; |
mbed_official | 237:f3da66175598 | 183 | } |
mbed_official | 237:f3da66175598 | 184 | |
mbed_official | 237:f3da66175598 | 185 | inline int i2c_stop(i2c_t *obj) |
mbed_official | 237:f3da66175598 | 186 | { |
mbed_official | 237:f3da66175598 | 187 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 188 | |
mbed_official | 237:f3da66175598 | 189 | // Generate the STOP condition |
mbed_official | 237:f3da66175598 | 190 | i2c->CR2 |= I2C_CR2_STOP; |
mbed_official | 237:f3da66175598 | 191 | |
mbed_official | 237:f3da66175598 | 192 | return 0; |
mbed_official | 237:f3da66175598 | 193 | } |
mbed_official | 237:f3da66175598 | 194 | |
mbed_official | 237:f3da66175598 | 195 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
mbed_official | 237:f3da66175598 | 196 | { |
mbed_official | 237:f3da66175598 | 197 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 198 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 199 | int timeout; |
mbed_official | 237:f3da66175598 | 200 | int count; |
mbed_official | 237:f3da66175598 | 201 | int value; |
mbed_official | 237:f3da66175598 | 202 | |
mbed_official | 237:f3da66175598 | 203 | /* update CR2 register */ |
mbed_official | 237:f3da66175598 | 204 | 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 | 237:f3da66175598 | 205 | | (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 | 237:f3da66175598 | 206 | |
mbed_official | 237:f3da66175598 | 207 | // Read all bytes |
mbed_official | 237:f3da66175598 | 208 | for (count = 0; count < length; count++) { |
mbed_official | 237:f3da66175598 | 209 | value = i2c_byte_read(obj, 0); |
mbed_official | 237:f3da66175598 | 210 | data[count] = (char)value; |
mbed_official | 237:f3da66175598 | 211 | } |
mbed_official | 237:f3da66175598 | 212 | |
mbed_official | 237:f3da66175598 | 213 | // Wait transfer complete |
mbed_official | 237:f3da66175598 | 214 | timeout = LONG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 215 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 237:f3da66175598 | 216 | timeout--; |
mbed_official | 237:f3da66175598 | 217 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 218 | return -1; |
mbed_official | 237:f3da66175598 | 219 | } |
mbed_official | 237:f3da66175598 | 220 | } |
mbed_official | 237:f3da66175598 | 221 | |
mbed_official | 237:f3da66175598 | 222 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 237:f3da66175598 | 223 | |
mbed_official | 237:f3da66175598 | 224 | // If not repeated start, send stop. |
mbed_official | 237:f3da66175598 | 225 | if (stop) { |
mbed_official | 237:f3da66175598 | 226 | i2c_stop(obj); |
mbed_official | 237:f3da66175598 | 227 | /* Wait until STOPF flag is set */ |
mbed_official | 237:f3da66175598 | 228 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 229 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 237:f3da66175598 | 230 | timeout--; |
mbed_official | 237:f3da66175598 | 231 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 232 | return -1; |
mbed_official | 237:f3da66175598 | 233 | } |
mbed_official | 237:f3da66175598 | 234 | } |
mbed_official | 237:f3da66175598 | 235 | /* Clear STOP Flag */ |
mbed_official | 237:f3da66175598 | 236 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 237:f3da66175598 | 237 | } |
mbed_official | 237:f3da66175598 | 238 | |
mbed_official | 237:f3da66175598 | 239 | return length; |
mbed_official | 237:f3da66175598 | 240 | } |
mbed_official | 237:f3da66175598 | 241 | |
mbed_official | 237:f3da66175598 | 242 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
mbed_official | 237:f3da66175598 | 243 | { |
mbed_official | 237:f3da66175598 | 244 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 245 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 246 | int timeout; |
mbed_official | 237:f3da66175598 | 247 | int count; |
mbed_official | 237:f3da66175598 | 248 | |
mbed_official | 237:f3da66175598 | 249 | /* update CR2 register */ |
mbed_official | 237:f3da66175598 | 250 | 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 | 237:f3da66175598 | 251 | | (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 | 237:f3da66175598 | 252 | |
mbed_official | 237:f3da66175598 | 253 | for (count = 0; count < length; count++) { |
mbed_official | 237:f3da66175598 | 254 | i2c_byte_write(obj, data[count]); |
mbed_official | 237:f3da66175598 | 255 | } |
mbed_official | 237:f3da66175598 | 256 | |
mbed_official | 237:f3da66175598 | 257 | // Wait transfer complete |
mbed_official | 237:f3da66175598 | 258 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 259 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) { |
mbed_official | 237:f3da66175598 | 260 | timeout--; |
mbed_official | 237:f3da66175598 | 261 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 262 | return -1; |
mbed_official | 237:f3da66175598 | 263 | } |
mbed_official | 237:f3da66175598 | 264 | } |
mbed_official | 237:f3da66175598 | 265 | |
mbed_official | 237:f3da66175598 | 266 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC); |
mbed_official | 237:f3da66175598 | 267 | |
mbed_official | 237:f3da66175598 | 268 | // If not repeated start, send stop. |
mbed_official | 237:f3da66175598 | 269 | if (stop) { |
mbed_official | 237:f3da66175598 | 270 | i2c_stop(obj); |
mbed_official | 237:f3da66175598 | 271 | /* Wait until STOPF flag is set */ |
mbed_official | 237:f3da66175598 | 272 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 273 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) { |
mbed_official | 237:f3da66175598 | 274 | timeout--; |
mbed_official | 237:f3da66175598 | 275 | if (timeout == 0) { |
mbed_official | 247:135e3186a638 | 276 | return -1; |
mbed_official | 237:f3da66175598 | 277 | } |
mbed_official | 237:f3da66175598 | 278 | } |
mbed_official | 237:f3da66175598 | 279 | /* Clear STOP Flag */ |
mbed_official | 237:f3da66175598 | 280 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF); |
mbed_official | 237:f3da66175598 | 281 | } |
mbed_official | 237:f3da66175598 | 282 | |
mbed_official | 237:f3da66175598 | 283 | return count; |
mbed_official | 237:f3da66175598 | 284 | } |
mbed_official | 237:f3da66175598 | 285 | |
mbed_official | 237:f3da66175598 | 286 | int i2c_byte_read(i2c_t *obj, int last) |
mbed_official | 237:f3da66175598 | 287 | { |
mbed_official | 237:f3da66175598 | 288 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 289 | int timeout; |
mbed_official | 237:f3da66175598 | 290 | |
mbed_official | 237:f3da66175598 | 291 | // Wait until the byte is received |
mbed_official | 237:f3da66175598 | 292 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 293 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) { |
mbed_official | 237:f3da66175598 | 294 | if ((timeout--) == 0) { |
mbed_official | 247:135e3186a638 | 295 | return -1; |
mbed_official | 237:f3da66175598 | 296 | } |
mbed_official | 237:f3da66175598 | 297 | } |
mbed_official | 237:f3da66175598 | 298 | |
mbed_official | 237:f3da66175598 | 299 | return (int)i2c->RXDR; |
mbed_official | 237:f3da66175598 | 300 | } |
mbed_official | 237:f3da66175598 | 301 | |
mbed_official | 237:f3da66175598 | 302 | int i2c_byte_write(i2c_t *obj, int data) |
mbed_official | 237:f3da66175598 | 303 | { |
mbed_official | 237:f3da66175598 | 304 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 305 | int timeout; |
mbed_official | 237:f3da66175598 | 306 | |
mbed_official | 237:f3da66175598 | 307 | // Wait until the previous byte is transmitted |
mbed_official | 237:f3da66175598 | 308 | timeout = FLAG_TIMEOUT; |
mbed_official | 237:f3da66175598 | 309 | while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) { |
mbed_official | 237:f3da66175598 | 310 | if ((timeout--) == 0) { |
mbed_official | 237:f3da66175598 | 311 | return 0; |
mbed_official | 237:f3da66175598 | 312 | } |
mbed_official | 237:f3da66175598 | 313 | } |
mbed_official | 237:f3da66175598 | 314 | |
mbed_official | 237:f3da66175598 | 315 | i2c->TXDR = (uint8_t)data; |
mbed_official | 237:f3da66175598 | 316 | |
mbed_official | 237:f3da66175598 | 317 | return 1; |
mbed_official | 237:f3da66175598 | 318 | } |
mbed_official | 237:f3da66175598 | 319 | |
mbed_official | 237:f3da66175598 | 320 | void i2c_reset(i2c_t *obj) |
mbed_official | 237:f3da66175598 | 321 | { |
mbed_official | 305:1f0269907d8b | 322 | int timeout; |
mbed_official | 305:1f0269907d8b | 323 | |
mbed_official | 305:1f0269907d8b | 324 | // wait before reset |
mbed_official | 305:1f0269907d8b | 325 | timeout = LONG_TIMEOUT; |
mbed_official | 305:1f0269907d8b | 326 | while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); |
mbed_official | 305:1f0269907d8b | 327 | |
mbed_official | 237:f3da66175598 | 328 | __I2C1_FORCE_RESET(); |
mbed_official | 237:f3da66175598 | 329 | __I2C1_RELEASE_RESET(); |
mbed_official | 237:f3da66175598 | 330 | } |
mbed_official | 237:f3da66175598 | 331 | |
mbed_official | 237:f3da66175598 | 332 | #if DEVICE_I2CSLAVE |
mbed_official | 237:f3da66175598 | 333 | |
mbed_official | 237:f3da66175598 | 334 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) |
mbed_official | 237:f3da66175598 | 335 | { |
mbed_official | 237:f3da66175598 | 336 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 337 | uint16_t tmpreg; |
mbed_official | 237:f3da66175598 | 338 | |
mbed_official | 237:f3da66175598 | 339 | // disable |
mbed_official | 237:f3da66175598 | 340 | i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 237:f3da66175598 | 341 | // Get the old register value |
mbed_official | 237:f3da66175598 | 342 | tmpreg = i2c->OAR1; |
mbed_official | 237:f3da66175598 | 343 | // Reset address bits |
mbed_official | 237:f3da66175598 | 344 | tmpreg &= 0xFC00; |
mbed_official | 237:f3da66175598 | 345 | // Set new address |
mbed_official | 237:f3da66175598 | 346 | tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits |
mbed_official | 237:f3da66175598 | 347 | // Store the new register value |
mbed_official | 237:f3da66175598 | 348 | i2c->OAR1 = tmpreg; |
mbed_official | 237:f3da66175598 | 349 | // enable |
mbed_official | 237:f3da66175598 | 350 | i2c->OAR1 |= I2C_OAR1_OA1EN; |
mbed_official | 237:f3da66175598 | 351 | } |
mbed_official | 237:f3da66175598 | 352 | |
mbed_official | 237:f3da66175598 | 353 | void i2c_slave_mode(i2c_t *obj, int enable_slave) |
mbed_official | 237:f3da66175598 | 354 | { |
mbed_official | 237:f3da66175598 | 355 | |
mbed_official | 237:f3da66175598 | 356 | I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 357 | uint16_t tmpreg; |
mbed_official | 237:f3da66175598 | 358 | |
mbed_official | 237:f3da66175598 | 359 | // Get the old register value |
mbed_official | 237:f3da66175598 | 360 | tmpreg = i2c->OAR1; |
mbed_official | 237:f3da66175598 | 361 | |
mbed_official | 237:f3da66175598 | 362 | // Enable / disable slave |
mbed_official | 237:f3da66175598 | 363 | if (enable_slave == 1) { |
mbed_official | 237:f3da66175598 | 364 | tmpreg |= I2C_OAR1_OA1EN; |
mbed_official | 237:f3da66175598 | 365 | } else { |
mbed_official | 237:f3da66175598 | 366 | tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN); |
mbed_official | 237:f3da66175598 | 367 | } |
mbed_official | 237:f3da66175598 | 368 | |
mbed_official | 237:f3da66175598 | 369 | // Set new mode |
mbed_official | 237:f3da66175598 | 370 | i2c->OAR1 = tmpreg; |
mbed_official | 237:f3da66175598 | 371 | |
mbed_official | 237:f3da66175598 | 372 | } |
mbed_official | 237:f3da66175598 | 373 | |
mbed_official | 237:f3da66175598 | 374 | // See I2CSlave.h |
mbed_official | 237:f3da66175598 | 375 | #define NoData 0 // the slave has not been addressed |
mbed_official | 237:f3da66175598 | 376 | #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter) |
mbed_official | 237:f3da66175598 | 377 | #define WriteGeneral 2 // the master is writing to all slave |
mbed_official | 237:f3da66175598 | 378 | #define WriteAddressed 3 // the master is writing to this slave (slave = receiver) |
mbed_official | 237:f3da66175598 | 379 | |
mbed_official | 237:f3da66175598 | 380 | int i2c_slave_receive(i2c_t *obj) |
mbed_official | 237:f3da66175598 | 381 | { |
mbed_official | 237:f3da66175598 | 382 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 383 | int retValue = NoData; |
mbed_official | 237:f3da66175598 | 384 | |
mbed_official | 237:f3da66175598 | 385 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) { |
mbed_official | 237:f3da66175598 | 386 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) { |
mbed_official | 237:f3da66175598 | 387 | if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1) |
mbed_official | 237:f3da66175598 | 388 | retValue = ReadAddressed; |
mbed_official | 237:f3da66175598 | 389 | else |
mbed_official | 237:f3da66175598 | 390 | retValue = WriteAddressed; |
mbed_official | 237:f3da66175598 | 391 | __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR); |
mbed_official | 237:f3da66175598 | 392 | } |
mbed_official | 237:f3da66175598 | 393 | } |
mbed_official | 237:f3da66175598 | 394 | |
mbed_official | 237:f3da66175598 | 395 | return (retValue); |
mbed_official | 237:f3da66175598 | 396 | } |
mbed_official | 237:f3da66175598 | 397 | |
mbed_official | 237:f3da66175598 | 398 | int i2c_slave_read(i2c_t *obj, char *data, int length) |
mbed_official | 237:f3da66175598 | 399 | { |
mbed_official | 237:f3da66175598 | 400 | char size = 0; |
mbed_official | 237:f3da66175598 | 401 | |
mbed_official | 237:f3da66175598 | 402 | while (size < length) data[size++] = (char)i2c_byte_read(obj, 0); |
mbed_official | 237:f3da66175598 | 403 | |
mbed_official | 237:f3da66175598 | 404 | return size; |
mbed_official | 237:f3da66175598 | 405 | } |
mbed_official | 237:f3da66175598 | 406 | |
mbed_official | 237:f3da66175598 | 407 | int i2c_slave_write(i2c_t *obj, const char *data, int length) |
mbed_official | 237:f3da66175598 | 408 | { |
mbed_official | 237:f3da66175598 | 409 | char size = 0; |
mbed_official | 237:f3da66175598 | 410 | I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); |
mbed_official | 237:f3da66175598 | 411 | |
mbed_official | 237:f3da66175598 | 412 | do { |
mbed_official | 237:f3da66175598 | 413 | i2c_byte_write(obj, data[size]); |
mbed_official | 237:f3da66175598 | 414 | size++; |
mbed_official | 237:f3da66175598 | 415 | } while (size < length); |
mbed_official | 237:f3da66175598 | 416 | |
mbed_official | 237:f3da66175598 | 417 | return size; |
mbed_official | 237:f3da66175598 | 418 | } |
mbed_official | 237:f3da66175598 | 419 | |
mbed_official | 237:f3da66175598 | 420 | |
mbed_official | 237:f3da66175598 | 421 | #endif // DEVICE_I2CSLAVE |
mbed_official | 237:f3da66175598 | 422 | |
mbed_official | 237:f3da66175598 | 423 | #endif // DEVICE_I2C |