ADS1115_LowLevel.c

#include "ADS1115_LowLevel.h"
/*
 This not my library.
*/
void I2C_StartTransmission(I2C_TypeDef* I2Cx, uint8_t transmissionDirection,  uint8_t slaveAddress)
{
    // Íà âñÿêèé ñëóûàé æäåì, ïîêà øèíà îñîâîáîäèòñÿ
    //while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

    //Start
    I2C_GenerateSTART(I2Cx, ENABLE);

    //Whaiting for flag
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    //Send address to slave
    I2C_Send7bitAddress(I2Cx, slaveAddress, transmissionDirection);

    if(transmissionDirection== I2C_Direction_Transmitter)
    {
    	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    }

    if(transmissionDirection== I2C_Direction_Receiver)
    {
    	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
    }
}

void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction){
	// wait until I2C1 is not busy anymore
	while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

	// Send I2C1 START condition
	I2C_GenerateSTART(I2Cx, ENABLE);

	// wait for I2C1 EV5 --> Slave has acknowledged start condition
	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

	// Send slave Address for write
	I2C_Send7bitAddress(I2Cx, address, direction);

	/* wait for I2C1 EV6, check if
	 * either Slave has acknowledged Master transmitter or
	 * Master receiver mode, depending on the transmission
	 * direction
	 */
	if(direction == I2C_Direction_Transmitter){
		while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
	}
	else if(direction == I2C_Direction_Receiver){
		while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
	}
}

void I2C_Write_Data(I2C_TypeDef* I2Cx, uint8_t data)
{
	/* This function transmits one byte to the slave device
	 * Parameters:
	 *		I2Cx --> the I2C peripheral e.g. I2C1
	 *		data --> the data byte to be transmitted
	 */
	I2C_SendData(I2Cx, data);
	// wait for I2C1 EV8_2 --> byte has been transmitted
	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

uint8_t I2C_Read_ack(I2C_TypeDef* I2Cx){
	/* This function reads one byte from the slave device
	 * and acknowledges the byte (requests another byte)
	 */
	// enable acknowledge of recieved data
	I2C_AcknowledgeConfig(I2Cx, ENABLE);
	// wait until one byte has been received
	while( !I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED) );
	// read data from I2C data register and return data byte
	uint8_t data = I2C_ReceiveData(I2Cx);
	return data;
}

	/* This function reads one byte from the slave device
	 * and doesn't acknowledge the recieved data
	 */
uint8_t I2C_Read_nack(I2C_TypeDef* I2Cx){
	// disabe acknowledge of received data
	// nack also generates stop condition after last byte received
	// see reference manual for more info
	I2C_AcknowledgeConfig(I2Cx, DISABLE);
	I2C_GenerateSTOP(I2Cx, ENABLE);
	// wait until one byte has been received
	while( !I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED) );
	// read data from I2C data register and return data byte
	uint8_t data = I2C_ReceiveData(I2Cx);
	return data;
}