/**
* @brief Writes one byte to the LIS3DSH.
* @param pBuffer : pointer to the buffer containing the data to be written to the LIS3DSH.
* @param WriteAddr : LIS3DSH's internal address to write to.
* @param NumByteToWrite: Number of bytes to write.
* @retval None
*/
void LIS3DSH_Write(uint8_t* pBuffer, uint8_t WriteAddr, uint16_t NumByteToWrite)
{
/* Configure the MS bit:
- When 0, the address will remain unchanged in multiple read/write commands.
- When 1, the address will be auto incremented in multiple read/write commands.
*/
if(NumByteToWrite > 0x01)
{
WriteAddr |= (uint8_t)MULTIPLEBYTE_CMD;
}
/* Set chip select Low at the start of the transmission */
LIS3DSH_CS_LOW();
/* Send the Address of the indexed register */
LIS3DSH_SendByte(WriteAddr);
/* Send the data that will be written into the device (MSB First) */
while(NumByteToWrite >= 0x01)
{
LIS3DSH_SendByte(*pBuffer);
NumByteToWrite--;
pBuffer++;
}
/* Set chip select High at the end of the transmission */
LIS3DSH_CS_HIGH();
}
/**
* @brief Reads a block of data from the LIS3DSH.
* @param pBuffer : pointer to the buffer that receives the data read from the LIS3DSH.
* @param ReadAddr : LIS3DSH's internal address to read from.
* @param NumByteToRead : number of bytes to read from the LIS3DSH.
* @retval None
*/
void LIS3DSH_Read(uint8_t* pBuffer, uint8_t ReadAddr, uint16_t NumByteToRead)
{
if(NumByteToRead > 0x01)
{
ReadAddr |= (uint8_t)(READWRITE_CMD | MULTIPLEBYTE_CMD);
}
else
{
ReadAddr |= (uint8_t)READWRITE_CMD;
}
/* Set chip select Low at the start of the transmission */
LIS3DSH_CS_LOW();
/* Send the Address of the indexed register */
LIS3DSH_SendByte(ReadAddr);
/* Receive the data that will be read from the device (MSB First) */
while(NumByteToRead > 0x00)
{
/* Send dummy byte (0x00) to generate the SPI clock to LIS3DSH (Slave device) */
*pBuffer = LIS3DSH_SendByte(DUMMY_BYTE);
NumByteToRead--;
pBuffer++;
}
/* Set chip select High at the end of the transmission */
LIS3DSH_CS_HIGH();
}
/**
* @brief Reads a register from the Accelerometer.
* @param addr : Address to read.
* @param value: The value read.
* @retval None
*/
void LIS3DSH_readRegister(LIS3DSH_Register addr, uint8_t* value) {
/* Set chip select Low at the start of the transmission */
LIS3DSH_CS_LOW();
addr |= (uint8_t)0x80;
uint8_t dummyByte = 0;
/* Send the Address of the indexed register */
/* Send a Byte through the SPI peripheral */
if (HAL_SPI_TransmitReceive(&SpiHandle, (uint8_t*) &addr,
(uint8_t*) &dummyByte, 1, LIS3DSH_FLAG_TIMEOUT) != HAL_OK) {
//Error TODO
}
/* Send the value of the indexed register */
/* Send a Byte through the SPI peripheral */
if (HAL_SPI_TransmitReceive(&SpiHandle, (uint8_t*) &dummyByte,
(uint8_t*) value, 1, LIS3DSH_FLAG_TIMEOUT) != HAL_OK) {
//Error TODO
}
/* Set chip select High at the end of the transmission */
LIS3DSH_CS_HIGH();
}
