98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* i2c support on STM32F0
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*
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* Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
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* This file may be distributed under the terms of the GNU GPLv3 license.
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*
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*/
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#include "stm32f0xx_hal.h"
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#include "command.h" // shutdown
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#include "board/gpio.h" // i2c_setup
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#include "sched.h" // sched_shutdown
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#include "command.h" // shutdown
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#include "board/misc.h" // timer_is_before
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I2C_HandleTypeDef hi2c1;
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struct i2c_config i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr)
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{
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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/**I2C1 GPIO Configuration
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PF0-OSC_IN ------> I2C1_SDA
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PF1-OSC_OUT ------> I2C1_SCL
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*/
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GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
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GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStruct.Alternate = GPIO_AF1_I2C1;
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HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
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hi2c1.Instance = I2C1;
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hi2c1.Init.Timing = 0x2000090E;
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hi2c1.Init.OwnAddress1 = addr;
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hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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hi2c1.Init.OwnAddress2 = 0;
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hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
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hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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HAL_I2C_Init(&hi2c1);
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/** Configure Analogue filter
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*/
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HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE);
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/** Configure Digital filter
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*/
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HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0);
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return (struct i2c_config){ .addr = addr };
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}
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static void
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i2c_to_check(uint32_t timeout)
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{
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if (!timer_is_before(timer_read_time(), timeout))
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shutdown("i2c timeout");
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}
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void i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
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{
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uint32_t timeout = timer_read_time() + timer_from_us(5000);
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while(HAL_I2C_Master_Transmit(&hi2c1, config.addr, write,
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(uint16_t)write_len, (uint32_t)1000)!= HAL_OK) {
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if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
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shutdown("Buffer error");
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}
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i2c_to_check(timeout);
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}
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}
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void i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
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, uint8_t read_len, uint8_t *read)
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{
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uint32_t timeout = timer_read_time() + timer_from_us(5000);
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i2c_write(config, reg_len, reg);
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while(HAL_I2C_Master_Receive(&hi2c1, config.addr, read,
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(uint16_t)read_len, (uint32_t)1000)!= HAL_OK) {
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if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
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shutdown("Buffer error");
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}
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i2c_to_check(timeout);
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}
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}
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/**
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* @brief I2C MSP Initialization
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* @param hi2c: I2C handle pointer
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* @retval None
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*/
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void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
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{
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if(hi2c->Instance==I2C1)
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{
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/* Peripheral clock enable */
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__HAL_RCC_GPIOF_CLK_ENABLE();
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__HAL_RCC_I2C1_CLK_ENABLE();
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}
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}
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