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124 lines
3.3 KiB
124 lines
3.3 KiB
#include "i2c.h"
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#include "stm32f10x_i2c.h"
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#include "stm32f10x_gpio.h"
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#include "porting.h"
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void i2cInit(I2C_TypeDef* I2Cx)
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{
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if (I2Cx == I2C1) {
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i2c1Init();
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}
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else {
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THROW_ERROR(E_I2C_NON_EXISTANT);
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}
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}
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void i2c1Init(void)
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{
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// Initialization structs
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GPIO_InitTypeDef i2c_gpio;
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I2C_InitTypeDef i2c;
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// Turn on clocks
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
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//Configure I2C module
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i2c.I2C_ClockSpeed = 100000;
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i2c.I2C_Mode = I2C_Mode_I2C;
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i2c.I2C_DutyCycle = I2C_DutyCycle_2;
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i2c.I2C_OwnAddress1 = 0x15;
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i2c.I2C_Ack = I2C_Ack_Enable;
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i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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I2C_Init(I2C1, &i2c);
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//Additionally we need to initialize corresponding GPIOs
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i2c_gpio.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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i2c_gpio.GPIO_Mode = GPIO_Mode_AF_OD; // Open drain only if you have pull-up resistors
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i2c_gpio.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &i2c_gpio);
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// Enable I2C 1
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I2C_Cmd(I2C1, ENABLE);
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DEBUG_MSG("I2C1 initialized.");
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}
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uint8_t i2cPing(I2C_TypeDef* I2Cx, uint8_t slave_addr)
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{
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DEBUG_MSG("Searching for: %d\n", slave_addr);
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// Wait until I2Cx is not busy anymore
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while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));
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// Generate start condition
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I2C_GenerateSTART(I2Cx, ENABLE);
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while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));
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// Send slave address
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I2C_Send7bitAddress(I2Cx, slave_addr<<1, I2C_Direction_Transmitter);
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// Wait for I2C EV5.
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volatile uint32_t timeout = 0xFFFF;
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) {
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if (timeout == 0) {
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break;
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} else {
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timeout--;
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}
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}
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I2C_GenerateSTOP(I2Cx, ENABLE);
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if (timeout > 0) {
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DEBUG_MSG("Slave found\n\r");
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return 1;
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} else {
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DEBUG_MSG("Slave not found\n\r");
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}
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return 0;
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}
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void i2cStartTransmission(I2C_TypeDef* I2Cx, uint8_t dir, uint8_t slave_addr)
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{
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// Wait for I2C module to become ready
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while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));
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// Generate I2C start condition
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I2C_GenerateSTART(I2Cx, ENABLE);
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// Waiting for EV5
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));
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// The 7 bit address needs to be shifted by 1
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I2C_Send7bitAddress(I2Cx, slave_addr<<1, dir);
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// Depending on whether the master is reading or writing another event is triggered
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if(dir== I2C_Direction_Transmitter)
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{
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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}
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if(dir== I2C_Direction_Receiver)
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{
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
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}
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}
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void i2cWrite(I2C_TypeDef* I2Cx, uint8_t* data, uint16_t len, uint32_t timeout)
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{
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if(len-- >= 1) {
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I2C_SendData(I2Cx, *data++);
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}
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED) && timeout) {
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timeout--;
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}
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}
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void i2cAckOn(I2C_TypeDef* I2Cx)
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{
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I2C_AcknowledgeConfig(I2Cx, ENABLE);
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}
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void i2cAckOff(I2C_TypeDef* I2Cx)
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{
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I2C_AcknowledgeConfig(I2Cx, DISABLE);
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}
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uint8_t i2cRead(I2C_TypeDef* I2Cx)
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{
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while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));
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uint8_t data = I2C_ReceiveData(I2Cx);
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return data;
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}
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void i2cEndTransmission(I2C_TypeDef* I2Cx)
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{
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I2C_GenerateSTOP(I2Cx, ENABLE);
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while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF));
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}
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