Hi LEO,
After dw1000 reset, SPI signal is very poor, 20 bytes read-only 12 bytes.
so the SPI acceptance driver function of STM32F103 can not be used directly on stm32l432kc, it needs to be modified before it can be used.
After modification, test with 20 bytes of data, send and receive successfully. And after dw1000 is initialized, SPI signal will also improve.
The modified code CS signal jitter also disappeared.
Modified code:
int readfromspi(uint16_t headerLength,
const uint8_t *headerBuffer,
uint32_t readlength,
uint8_t *readBuffer)
{
int i;
decaIrqStatus_t stat ;
stat = decamutexon() ;
char temp;
/* Blocking: Check whether previous transfer has been finished */
while (HAL_SPI_GetState(&hspi1) != HAL_SPI_STATE_READY);
HAL_GPIO_WritePin(DW_NSS_GPIO_Port, DW_NSS_Pin, GPIO_PIN_RESET); /**< Put chip select line low */
/* Send header */
for(i=0; i<headerLength; i++)
{
//HAL_SPI_Transmit(&hspi1, &headerBuffer[i], 1, HAL_MAX_DELAY); //No timeout
HAL_SPI_TransmitReceive(&hspi1, &headerBuffer[i], (uint8_t *)&temp, 1, HAL_MAX_DELAY);
}
/* for the data buffer use LL functions directly as the HAL SPI read function
* has issue reading single bytes */
HAL_SPI_TransmitReceive(&hspi1, &headerBuffer[i], (uint8_t *)readBuffer, readlength, HAL_MAX_DELAY);
HAL_GPIO_WritePin(DW_NSS_GPIO_Port, DW_NSS_Pin, GPIO_PIN_SET); /**< Put chip select line high */
decamutexoff(stat);
return 0;
} // end readfromspi()