mirror of https://github.com/ArduPilot/ardupilot
282 lines
7.8 KiB
C
282 lines
7.8 KiB
C
/*
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(c) 2017 night_ghost@ykoctpa.ru
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based on: datasheet
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*/
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#pragma GCC optimize ("O2")
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#include "i2c.h"
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#include "dma.h"
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#include "systick.h"
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#include "stm32f4xx_i2c.h"
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#include "stm32f4xx_dma.h"
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static i2c_state i2c1_state IN_CCM;
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static i2c_state i2c2_state IN_CCM;
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static const i2c_dev i2c_dev1 = {
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.I2Cx = I2C1,
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.gpio_port = &gpiob,
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.sda_pin = 9,
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.scl_pin = 8,
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.clk = RCC_APB1Periph_I2C1,
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.gpio_af = GPIO_AF_I2C1,
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.ev_nvic_line = I2C1_EV_IRQn,
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.er_nvic_line = I2C1_ER_IRQn,
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// .dma = { DMA_CR_CH1, DMA1_STREAM0, DMA1_STREAM6 }, // I2C1
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.state = &i2c1_state,
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};
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/** I2C1 device */
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const i2c_dev* const _I2C1 = &i2c_dev1;
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static const i2c_dev i2c_dev2 = {
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.I2Cx = I2C2,
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.gpio_port = &gpiob,
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.sda_pin = 11,
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.scl_pin = 10,
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.clk = RCC_APB1Periph_I2C2,
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.gpio_af = GPIO_AF_I2C2,
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.ev_nvic_line = I2C2_EV_IRQn,
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.er_nvic_line = I2C2_ER_IRQn,
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// .dma = { DMA_CR_CH7, DMA1_STREAM3 /* intersects with spi2_tx */ , DMA1_STREAM7 }, // I2C2
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.state = &i2c2_state,
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};
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/** I2C2 device */
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const i2c_dev* const _I2C2 = &i2c_dev2;
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typedef enum {TX = 0, RX = 1, TXREG = 2} I2C_Dir;
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static void delay_10us(){
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hal_delay_microseconds(10);
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}
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uint32_t i2c_bit_time=4;
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/**
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* @brief DeInitializes peripherals used by the I2C driver.
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* @param None
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* @retval None
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*/
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void i2c_lowLevel_deinit(const i2c_dev *dev){
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GPIO_InitTypeDef GPIO_InitStructure;
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/* I2C Peripheral Disable */
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I2C_Cmd(dev->I2Cx, DISABLE);
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/* I2C DeInit */
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I2C_DeInit(dev->I2Cx);
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/*!< GPIO configuration */
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // low speed to prevent glitches
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/*!< Configure I2C pins: SCL */
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GPIO_InitStructure.GPIO_Pin = BIT(dev->scl_pin);
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GPIO_Init(dev->gpio_port->GPIOx, &GPIO_InitStructure);
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/*!< Configure I2C pins: SDA */
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GPIO_InitStructure.GPIO_Pin = BIT(dev->sda_pin);
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GPIO_Init(dev->gpio_port->GPIOx, &GPIO_InitStructure);
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}
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/**
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* @brief Initializes peripherals used by the I2C driver.
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*/
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static inline void i2c_lowLevel_init(const i2c_dev *dev) {
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memset(dev->state,0,sizeof(i2c_state));
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Enable the i2c */
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RCC_APB1PeriphClockCmd(dev->clk, ENABLE);
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/* Reset the Peripheral */
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RCC_APB1PeriphResetCmd(dev->clk, ENABLE);
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RCC_APB1PeriphResetCmd(dev->clk, DISABLE);
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/* Enable the GPIOs for the SCL/SDA Pins */
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RCC_AHB1PeriphClockCmd(dev->gpio_port->clk, ENABLE);
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memset(dev->state,0,sizeof(i2c_state));
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// common configuration
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/* common GPIO configuration */
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz; // GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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/* Configure SCL */
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GPIO_InitStructure.GPIO_Pin = BIT(dev->scl_pin);
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GPIO_Init(dev->gpio_port->GPIOx, &GPIO_InitStructure);
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/* Configure SDA */
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GPIO_InitStructure.GPIO_Pin = BIT(dev->sda_pin);
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GPIO_Init(dev->gpio_port->GPIOx, &GPIO_InitStructure);
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/* Connect GPIO pins to peripheral, SCL must be first! */
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gpio_set_af_mode(dev->gpio_port, dev->scl_pin, dev->gpio_af);
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gpio_set_af_mode(dev->gpio_port, dev->sda_pin, dev->gpio_af);
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}
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void i2c_init(const i2c_dev *dev, uint16_t address, uint32_t speed)
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{
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i2c_lowLevel_init(dev); // init GPIO hardware
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i2c_bit_time = 1000000l / speed;
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I2C_InitTypeDef I2C_InitStructure; /* I2C configuration */
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I2C_StructInit(&I2C_InitStructure);
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I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
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I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
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I2C_InitStructure.I2C_OwnAddress1 = address;
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I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
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I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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I2C_InitStructure.I2C_ClockSpeed = speed;
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I2C_ITConfig(dev->I2Cx, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
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(void)dev->I2Cx->DR;
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/* I2C Peripheral Enable */
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I2C_Cmd(dev->I2Cx, ENABLE);
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/* Apply I2C configuration after enabling it */
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I2C_Init(dev->I2Cx, &I2C_InitStructure);
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}
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/**
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* @brief DeInitializes peripherals used by the I2C driver.
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* @param None
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* @retval None
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*/
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void i2c_deinit(const i2c_dev *dev)
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{
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i2c_lowLevel_deinit(dev);
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}
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static void ev_handler(const i2c_dev *dev, bool err){
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if(dev->state->handler) revo_call_handler(dev->state->handler, err);
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else { // disable interrupts
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dev->I2Cx->CR2 &= ~(I2C_CR2_ITBUFEN|I2C_CR2_ITEVTEN|I2C_CR2_ITERREN); // Disable interrupts
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}
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}
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void I2C1_EV_IRQHandler(); // to avoid warnings
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void I2C1_ER_IRQHandler();
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void I2C2_EV_IRQHandler();
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void I2C2_ER_IRQHandler();
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void I2C1_EV_IRQHandler(){ // I2C1 Event
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ev_handler(_I2C1, false);
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}
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void I2C1_ER_IRQHandler(){ // I2C1 Error
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ev_handler(_I2C1, true);
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}
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void I2C2_EV_IRQHandler(){ // I2C2 Event
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ev_handler(_I2C2, false);
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}
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void I2C2_ER_IRQHandler(){ // I2C2 Error
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ev_handler(_I2C2, true);
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}
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void i2c_master_release_bus(const i2c_dev *dev) {
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gpio_write_bit(dev->gpio_port, dev->scl_pin, 1);
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gpio_write_bit(dev->gpio_port, dev->sda_pin, 1);
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gpio_set_mode(dev->gpio_port, dev->scl_pin, GPIO_OUTPUT_OD_PU);
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gpio_set_mode(dev->gpio_port, dev->sda_pin, GPIO_OUTPUT_OD_PU);
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}
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/**
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* @brief Reset an I2C bus.
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*
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* Reset is accomplished by clocking out pulses until any hung slaves
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* release SDA and SCL, then generating a START condition, then a STOP
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* condition.
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*
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* @param dev I2C device
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*/
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#define MAX_I2C_TIME 300 // 300ms before device turn off
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bool i2c_bus_reset(const i2c_dev *dev) {
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/* Release both lines */
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i2c_master_release_bus(dev);
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uint32_t t=systick_uptime();
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/*
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* Make sure the bus is free by clocking it until any slaves release the
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* bus.
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*/
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again:
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/* Wait for any clock stretching to finish */
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while (!gpio_read_bit(dev->gpio_port, dev->scl_pin)) {// device can output 1 so check clock first
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if(systick_uptime()-t > MAX_I2C_TIME) return false;
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hal_yield(10);
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}
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delay_10us(); // 50kHz
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while (!gpio_read_bit(dev->gpio_port, dev->sda_pin)) {
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/* Wait for any clock stretching to finish */
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while (!gpio_read_bit(dev->gpio_port, dev->scl_pin)){
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if(systick_uptime()-t > MAX_I2C_TIME) return false;
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hal_yield(10);
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}
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delay_10us(); // 50kHz
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/* Pull low */
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gpio_write_bit(dev->gpio_port, dev->scl_pin, 0);
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delay_10us();
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/* Release high again */
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gpio_write_bit(dev->gpio_port, dev->scl_pin, 1);
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delay_10us();
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}
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/* Generate start then stop condition */
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gpio_write_bit(dev->gpio_port, dev->sda_pin, 0);
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delay_10us();
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gpio_write_bit(dev->gpio_port, dev->scl_pin, 0);
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delay_10us();
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gpio_write_bit(dev->gpio_port, dev->scl_pin, 1);
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delay_10us();
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gpio_write_bit(dev->gpio_port, dev->sda_pin, 1);
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uint32_t rtime = stopwatch_getticks();
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uint32_t dt = us_ticks * 50; // 50uS
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while ((stopwatch_getticks() - rtime) < dt) {
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if (!gpio_read_bit(dev->gpio_port, dev->scl_pin)) goto again; // any SCL activity after STOP
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}
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// we was generating signals on I2C bus, but BUSY flag senses it even when hardware is off
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// datasheet: It indicates a communication in progress on the bus. This information is still updated when the interface is disabled (PE=0).
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dev->I2Cx->CR1 |= I2C_CR1_SWRST; // set SoftReset for some time
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hal_yield(0);
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dev->I2Cx->CR1 &= (uint16_t)(~I2C_CR1_SWRST); // clear SoftReset flag
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return true;
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}
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