/**
* @brief Set the CS pin to low and wait until SO pin goes low
* @param None
* @retval None
*/
static uint8_t CC2500_Chip_Select(void)
{
CC2500Timeout = CC2500_FLAG_TIMEOUT;
CC2500_CS_LOW();
while (GPIO_ReadInputDataBit(CC2500_SPI_MISO_GPIO_PORT, CC2500_SPI_MISO_PIN)
== (uint8_t) Bit_SET)
{
if((CC2500Timeout--) == 0) return CC2500_TIMEOUT_UserCallback();
}
return 0;
}
/**
* @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 CC2500_SendByte(uint8_t byte)
{
/* Loop while DR register in not emplty */
CC2500Timeout = CC2500_FLAG_TIMEOUT;
while (SPI_I2S_GetFlagStatus(CC2500_SPI, SPI_I2S_FLAG_TXE) == RESET)
{
if((CC2500Timeout--) == 0) return CC2500_TIMEOUT_UserCallback();
}
/* Send a Byte through the SPI peripheral */
SPI_I2S_SendData(CC2500_SPI, byte);
/* Wait to receive a Byte */
CC2500Timeout = CC2500_FLAG_TIMEOUT;
while (SPI_I2S_GetFlagStatus(CC2500_SPI, SPI_I2S_FLAG_RXNE) == RESET)
{
if((CC2500Timeout--) == 0) return CC2500_TIMEOUT_UserCallback();
}
/* Return the Byte read from the SPI bus */
return (uint8_t)SPI_I2S_ReceiveData(CC2500_SPI);
}
/**
* @brief Issue chip reset command.
* @param None
* @retval uint8_t : 0(Ok) or CC2500_TIMEOUT_ERROR
*/
uint8_t CC2500_SRES_CMD(void)
{
CC2500Timeout = CC2500_FLAG_TIMEOUT;
CC2500_WriteCommand(CC2500_COMMAND_SRES, 0);
while (GPIO_ReadInputDataBit(CC2500_SPI_MISO_GPIO_PORT, CC2500_SPI_MISO_PIN)
== (uint8_t) Bit_SET)
{
if((CC2500Timeout--) == 0)
{
return CC2500_TIMEOUT_UserCallback();
}
}
return 0;
}
