/**
* @brief Send one Byte through the SPI interface and return the received Byte
* @param uint8_t byte The byte to send
* @retval uint8_t The received byte value
*/
static uint8_t _LIS302DL_SendByte(SPI_TypeDef* spi, uint8_t byte) {
volatile uint32_t _LIS302DL_Timeout = LIS302DL_MAX_TIMEOUT;
// Loop while DR register in not empty; or we ran into a timeout
_LIS302DL_Timeout = LIS302DL_MAX_TIMEOUT;
while (SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) == RESET) {
if ((_LIS302DL_Timeout--) == 0) {
return LIS302DL_TIMEOUT_UserCallback();
}
}
// Send a Byte through the SPI peripheral
SPI_I2S_SendData(spi, byte);
// Wait to receive a Byte; or we ran into a timeout
_LIS302DL_Timeout = LIS302DL_MAX_TIMEOUT;
while (SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) == RESET) {
if ((_LIS302DL_Timeout--) == 0) {
return LIS302DL_TIMEOUT_UserCallback();
}
}
/* Return the Byte read from the SPI bus */
return (uint8_t)SPI_I2S_ReceiveData(spi);
}
/**
* @brief Sends a Byte through the SPI interface and return the Byte received
* from the SPI bus.
* @param Byte : Byte send.
* @retval The received byte value
*/
static uint8_t LIS302DL_SendByte(uint8_t byte) {
/* Loop while DR register in not emplty */
LIS302DLTimeout = LIS302DL_FLAG_TIMEOUT;
while (SPI_I2S_GetFlagStatus(LIS302DL_SPI, SPI_I2S_FLAG_TXE) == RESET) {
if ((LIS302DLTimeout--) == 0) return LIS302DL_TIMEOUT_UserCallback();
}
/* Send a Byte through the SPI peripheral */
SPI_I2S_SendData(LIS302DL_SPI, byte);
/* Wait to receive a Byte */
LIS302DLTimeout = LIS302DL_FLAG_TIMEOUT;
while (SPI_I2S_GetFlagStatus(LIS302DL_SPI, SPI_I2S_FLAG_RXNE) == RESET) {
if ((LIS302DLTimeout--) == 0) return LIS302DL_TIMEOUT_UserCallback();
}
/* Return the Byte read from the SPI bus */
return (uint8_t) SPI_I2S_ReceiveData(LIS302DL_SPI);
}