Posted on August 25, 2017 at 12:09I have a difficulty with ST32F030 and Slave SPI
I'm trying to have it respond to an spi command:-
Master sends 0x05, slave responds with an array of 7 bytes.
It kind of works the first time, but then loses sync, and get OVR bit set. I can't figure out why.
Heres the code:-
int main(void)
{
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_SPI1_Init();
spi_init();
while (1)
{
HAL_SPI_Receive_IT(&hspi1, &spiData[0], 1);
}
}
/* SPI1 init function */
static void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_SLAVE;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
/* SPi priority interrupt configuration */
HAL_NVIC_SetPriority(SPI1_IRQn, 1, 1);
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
}
void SPI1_IRQHandler(void)
{
HAL_SPI_IRQHandler(&hspi1);
}
uint8_t spiData[8];
uint8_t edgesmsg[7];
void spi_interrupt()
{
uint8_t c;
c = spiData[0];
if ( c == 0x05)
HAL_SPI_Transmit(&hspi1, edgesmsg, 7, 1000);
}
Any suggestions gratefully received..
#spi #slave
