Hi,
I am working on interfacing IS25LP128 128Mbit QSPI Flash with STM32H743 Nucleo board. I am running into problem with how the QSPI controller is driving the NCS line. The flash requires that the chip select remains low between command and data read/write operations. But the way QSPI HAL APIs are provided, it required two different calls. First to set command, and second to transmit or receive data.
The problem is that the QSPI controller drives NCS high between these call, and the flash reject the transaction. Is is something I am missing in using the QSPI HAL driver? Has anyone found any solution for this?
QSPI Initialization
static void MX_QUADSPI_Init(void)
{
/* USER CODE BEGIN QUADSPI_Init 0 */
/* USER CODE END QUADSPI_Init 0 */
/* USER CODE BEGIN QUADSPI_Init 1 */
/* USER CODE END QUADSPI_Init 1 */
/* QUADSPI parameter configuration*/
hqspi.Instance = QUADSPI;
hqspi.Init.ClockPrescaler = 50;
hqspi.Init.FifoThreshold = 4;
hqspi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_NONE;
hqspi.Init.FlashSize = 22;
hqspi.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_1_CYCLE;
hqspi.Init.ClockMode = QSPI_CLOCK_MODE_0;
hqspi.Init.FlashID = QSPI_FLASH_ID_1;
hqspi.Init.DualFlash = QSPI_DUALFLASH_DISABLE;
if (HAL_QSPI_Init(&hqspi) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN QUADSPI_Init 2 */
/* USER CODE END QUADSPI_Init 2 */
}
Flash Register Read Routine
{
int retStatus = -1;
QSPI_CommandTypeDef rdRegCommand;
memset(&rdRegCommand, 0, sizeof(rdRegCommand));
/* Prepare QPSI Command */
rdRegCommand.InstructionMode = QSPI_INSTRUCTION_4_LINES;
rdRegCommand.Instruction = pCmdInfo->cmd;
rdRegCommand.AddressMode = QSPI_ADDRESS_NONE;
rdRegCommand.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
rdRegCommand.DataMode = QSPI_DATA_4_LINES;
rdRegCommand.DummyCycles = pCmdInfo->dummy;
rdRegCommand.DdrMode = QSPI_DDR_MODE_DISABLE;
rdRegCommand.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
rdRegCommand.NbData = pCmdInfo->size;
/* Send EFD Read Register Command to QPSI Line */
if(HAL_OK == HAL_QSPI_Command(phqspi, &rdRegCommand, HAL_QPSI_TIMEOUT_DEFAULT_VALUE))
{
/* At this point, the NCS goes high */
/* Receive EFD Read Register data from QSPI Line */
if(HAL_OK == HAL_QSPI_Receive(phqspi, pdata, HAL_QPSI_TIMEOUT_DEFAULT_VALUE))
retStatus = 0;
}
return retStatus;
}
