unsigned char I2C_ReadRegister(unsigned char u8SlaveAddress, unsigned char u8RegisterAddress)
{
unsigned char result;
I2C_Start();
I2C0_D = u8SlaveAddress << 1; /* Send I2C device address with W/R bit = 0 */
I2C_Wait();
I2C0_D = u8RegisterAddress; /* Send register address */
I2C_Wait();
I2C_RepeatedStart();
I2C0_D = (u8SlaveAddress << 1) | 0x01; /* Send I2C device address this time with W/R bit = 1 */
I2C_Wait();
I2C_EnterRxMode();
I2C_DisableAck();
result = I2C0_D;
I2C_Wait();
I2C_Stop();
result = I2C0_D;
Pause(50);
return result;
}
/**
* @brief
* @param
* @param
* @param
* @retval
*/
uint8_t ADXL345_ReadReg(uint8_t ADXL345_Reg){
//Send request for register contents.
I2C_Start(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Transmitter);
I2C_Write(ADXL345_Reg);
I2C_RepeatedStart(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Receiver);
uint8_t readvalue = I2C_Read_NAck();
return readvalue;
}
//==============================================================================
//Gets information of RTC.
//byte 0: Sets the "Word Address"
//byte1: Return the information.
//==============================================================================
unsigned char DS3231_GetInfo(unsigned char byte0){
unsigned char byte1 = 0;
I2C_Start();
I2C_WriteByte(0xD0);
I2C_WriteByte(byte0);
I2C_RepeatedStart();
I2C_WriteByte(0xD1);
byte1 = I2C_ReadByte(0);
I2C_Stop();
return(byte1);
}
/**
* @brief
* @param
* @param
* @param
* @retval
*/
int16_t ADXL345_ReadZ(){
/** Do a multi byte read. */
uint8_t buffer[2];
uint16_t bytes_read;
I2C_Start(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Transmitter);
I2C_Write(ADXL345_DATAZ0_REG_ADDR);
I2C_RepeatedStart(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Receiver);
bytes_read = I2C_Read_Buf(buffer,2);
I2C_Stop();
while(bytes_read != 2){}
/** assemble data */
int16_t data = ( buffer[1] <<8 | buffer[0] );
return data;
}
void ADXL345_ReadXYZ(int16_t data[]){
/** Do a multi byte read. */
uint8_t buffer[6];
uint16_t bytes_read;
I2C_Start(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Transmitter);
I2C_Write(ADXL345_DATAX0_REG_ADDR); //X0 thru to Z1 are sequential.
I2C_RepeatedStart(ADXL345_I2C_7BIT_ADDRESS<<1, I2C_Direction_Receiver);
bytes_read = I2C_Read_Buf(buffer,6);
I2C_Stop();
while(bytes_read != 6){}
/** assemble data */
int16_t xdata = ( buffer[1] <<8 | buffer[0] );
int16_t ydata = ( buffer[3] <<8 | buffer[2] );
int16_t zdata = ( buffer[5] <<8 | buffer[4] );
data[0] = xdata;
data[1] = ydata;
data[2] = zdata;
}
void I2C_ReadMultiRegisters(unsigned char u8SlaveAddress, unsigned char u8RegisterAddress, unsigned char n, unsigned char *r)
{
char i;
I2C_Start();
I2C0_D = u8SlaveAddress << 1; /* Send I2C device address with W/R bit = 0 */
I2C_Wait();
I2C0_D = u8RegisterAddress; /* Send register address */
I2C_Wait();
I2C_RepeatedStart();
I2C0_D = (u8SlaveAddress << 1) | 0x01; /* Send I2C device address this time with W/R bit = 1 */
I2C_Wait();
I2C_EnterRxMode();
I2C_EnableAck();
i = I2C0_D;
I2C_Wait();
for(i=0; i<n-2; i++)
{
*r = I2C0_D;
r++;
I2C_Wait();
}
I2C_DisableAck();
*r = I2C0_D;
r++;
I2C_Wait();
I2C_Stop();
*r = I2C0_D;
Pause(50);
}
