SPI receive in interrupt mode lost last 2 bytes (STM32F103RC)
Hello!
I'm testing the communications between SPI1 and SPI3 in STM32F103RC.
SPI1 and SPI3 are using interrupts, dma is off.
When I try to read received bytes I found that rdata[6] = 0 and rdata[7] = 0, but must be 0x7 and 0x8 respectively.
When I use DMA on both sides everything is OK.
And when I use transmit function in blocking mode(i.e HAL_SPI_Transmit()) everything is OK.
Speed_medium means prescaller_16.
HSE = 8MHz
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
spi_mode0 is CPOL=0, CPHA =0;
nss controlled by hardware.
uint8_t tdata[8] = {0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8};
uint8_t rdata[8] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
er = initSPI(SPI3, type_master, spi_mode0, speed_medium, dma_disable, NULL, tcv, size_8bit, dir_RXTX, firstbit_LSB, crc_disable);
TEST_ASSERT_MESSAGE(HAL_OK == er, "SPI3 Init failed");
er = initSPI(SPI1, type_slave, spi_mode0, speed_medium, dma_disable, rcv, NULL, size_8bit, dir_RXTX, firstbit_LSB, crc_disable);
TEST_ASSERT_MESSAGE(HAL_OK == er, "SPI1 Init failed");
TEST_ASSERT_MESSAGE(HAL_SPI_Receive_IT(&hspi1, rdata, 8) == HAL_OK, "SPI1 receive failed");
TEST_ASSERT_MESSAGE(HAL_SPI_Transmit_IT(&hspi3, tdata, 8) == HAL_OK, "SPI3 transmit failed");
TEST_ASSERT_EQUAL_INT(hspi1.ErrorCode, 0);
TEST_ASSERT_EQUAL_INT(hspi3.ErrorCode, 0);
I found the solution in driver HAL.
In SPI_TxISR_8BIT I added small delay.
static void SPI_TxISR_8BIT(struct __SPI_HandleTypeDef *hspi)
{
*(__IO uint8_t *)&hspi->Instance->DR = (*hspi->pTxBuffPtr);
hspi->pTxBuffPtr++;
hspi->TxXferCount--;
HAL_Delay(1);
if (hspi->TxXferCount == 0U)
{
#if (USE_SPI_CRC != 0U)
if (hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE)
{
/* Enable CRC Transmission */
SET_BIT(hspi->Instance->CR1, SPI_CR1_CRCNEXT);
}
#endif /* USE_SPI_CRC */
SPI_CloseTx_ISR(hspi);
}
}
Do you think this is a normal solution or is there a more elegant solution?
