Posted on November 23, 2016 at 21:40
Something like this should work,
#define ACCEL_SPI SPI1
#define ACCEL_DUMMY_BYTE 0xFF
/**
* @brief Select ACCEL: Chip Select pin low
*/
#define ACCEL_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
/**
* @brief Deselect ACCEL: Chip Select pin high
*/
#define ACCEL_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)
/**
* @brief Initializes the peripherals used by the SPI ACCEL driver.
* @param None
* @retval None
*/
void ACCEL_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
ACCEL_LowLevel_Init(); /* Pins */
/*!< Deselect the ACCEL: Chip Select high */
ACCEL_CS_HIGH();
/*!< SPI configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(ACCEL_SPI, &SPI_InitStructure);
/*!< Enable the ACCEL_SPI */
SPI_Cmd(ACCEL_SPI, ENABLE);
}
/**
* @brief Sends a byte through the SPI interface and return the byte received
* from the SPI bus.
* @param byte: byte to send.
* @retval The value of the received byte.
*/
uint8_t ACCEL_SendByte(uint8_t byte)
{
/*!< Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(ACCEL_SPI, SPI_I2S_FLAG_TXE) == RESET);
/*!< Send byte through the SPI1 peripheral */
SPI_I2S_SendData(ACCEL_SPI, byte);
/*!< Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(ACCEL_SPI, SPI_I2S_FLAG_RXNE) == RESET);
/*!< Return the byte read from the SPI bus */
return SPI_I2S_ReceiveData(ACCEL_SPI);
}
/**
* @brief Reads ACCEL identification.
* @param None
* @retval ACCEL identification
*/
uint8_t ACCEL_ReadID(void)
{
uint8_t Temp = 0;
/*!< Select the ACCEL: Chip Select low */
ACCEL_CS_LOW();
/*!< Send read register instruction */
ACCEL_SendByte(0x0B);
/*!< Send PARTID register */
ACCEL_SendByte(0x02);
/*!< Read a byte from the ACCEL */
Temp = ACCEL_SendByte(ACCEL_DUMMY_BYTE);
/*!< Deselect the ACCEL: Chip Select high */
ACCEL_CS_HIGH();
return Temp;
}
This is a quick blind port, you'd need to configure the SPI pins, and the chip select pin (PA4) as a GPIO
