/**
* @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 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 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();
}
/**
* @brief Configures LIS3DSH
* @param InitTypeDef: Specifies the configuration.
* @retval None
*/
void LIS3DSH_init(LIS3DSH_InitTypeDef li) {
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure the LIS3DSH Control pins --------------------------------*/
/* Enable CS GPIO clock and configure GPIO pin for LIS3DSH Chip select */
LIS3DSH_SPI_CS_GPIO_CLK_ENABLE();
/* Configure GPIO PIN for LIS Chip select */
GPIO_InitStructure.Pin = LIS3DSH_SPI_CS_PIN;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Speed = GPIO_SPEED_MEDIUM;
HAL_GPIO_Init(LIS3DSH_SPI_CS_GPIO_PORT, &GPIO_InitStructure);
/* Deselect: Chip Select high */
/* SPI start when the chip select is low */
LIS3DSH_CS_HIGH();
/* Configure the SPI1 to communicate with the accelerometer */
if (HAL_SPI_GetState(&SpiHandle) == HAL_SPI_STATE_RESET)
{
/* SPI configuration -----------------------------------------------------*/
SpiHandle.Instance = LIS3DSH_SPI;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
SpiHandle.Init.Mode = SPI_MODE_MASTER;
/* SPI low level configuration */
/* Enable the SPI peripheral */
LIS3DSH_SPI_CLK_ENABLE();
/* Enable SCK, MOSI and MISO GPIO clocks */
LIS3DSH_SPI_GPIO_CLK_ENABLE();
/* SPI SCK, MOSI, MISO pin configuration */
GPIO_InitStructure.Pin = (LIS3DSH_SPI_SCK_PIN | LIS3DSH_SPI_MISO_PIN
| LIS3DSH_SPI_MOSI_PIN);
GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.Pull = GPIO_PULLDOWN;
GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
GPIO_InitStructure.Alternate = LIS3DSH_SPI_AF;
HAL_GPIO_Init(LIS3DSH_SPI_GPIO_PORT, &GPIO_InitStructure);
HAL_SPI_Init(&SpiHandle);
}
/* Configures the inner register of the accelerometer */
LIS3DSH_writeRegister(LIS3DSH_CTRL_REG4_ADDR, li.OutputDataRate | li.Axes_Enable | li.BlockDataUpdate);
LIS3DSH_writeRegister(LIS3DSH_CTRL_REG5_ADDR, li.FullScale);
}
