uint8_t txByte_master = 0xA5; // Byte to send
uint8_t rxByte_master = 0x00; // Received byte
volatile uint16_t count = 0;
uint8_t dummyTx = 0x00;
uint8_t dummyRx = 0x00;
volatile uint8_t spi_ready = 0; // Flag to indicate SPI transfer complete
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_SPI1_Init(void);
int main(void)
{
HAL_Init();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_SPI1_Init();
while (1)
{
spi_ready = 0; // Reset flag
// Start SPI communication
HAL_SPI_TransmitReceive_IT(&hspi1, &txByte_master, &rxByte_master, 1);
// Wait until the transaction completes
while (spi_ready == 0);
// Check if received data is correct
if (rxByte_master== 0xA5) {
HAL_SPI_DeInit(&hspi1);// HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // Blink LED if correct
}
HAL_Delay(500); // Delay for visibility
}
/* USER CODE END 3 */
}
SLAVE SIDE
uint8_t rxByte_slave = 0x00; // Received byte
uint8_t txByte_slave = 0x00; // Byte to send back (Echo)
uint8_t txByte_slave_check = 0xCE; // Byte to send back for check
volatile uint8_t spi_ready = 0; // Flag to indicate SPI transfer complete
int main(void)
{
HAL_Init();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_SPI1_Init();
while (1)
{
spi_ready = 0; // Reset flag
HAL_SPI_Receive_IT(&hspi1, &rxByte_slave, 1);
while (spi_ready == 0);
txByte_slave = rxByte_slave;
spi_ready = 0; // Reset flag
HAL_SPI_Transmit_IT(&hspi1, &txByte_slave, 1);
while (spi_ready == 0);
}
}
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi) {
if (hspi->Instance == SPI1) {
spi_ready = 1; // Set flag indicating reception complete
}
}
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi) {
if (hspi->Instance == SPI1) {
spi_ready = 1; // Set flag indicating transmission complete
}
}
Above written code is for master and slave in which I am trying to echo 1 Byte of Data
through SPI Protocol, here on I am able to capture exact 8 bit of data on slave side but
when slave transmit the same data to master, then master is unable to capture the exact data
and capture some random data .
try to help me in order to solve this problem....
Both side means Master and Slave the board I am using is NUCLEO-F401RE
Note :
I have set the slave side on External oscillator.
