I'm reading data from an FPGA over QSPI. I'm attempting to read 256 bytes at a time. However, when I read the data the QSPI clock decides to take a long pause before continuing. I get an initial burst of 74 clock pulses, then 56 bursts of 8 clock pulses, each with a long pause preceding them.
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 = 4;
hqspi.Init.FifoThreshold = 31;
hqspi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_NONE;
hqspi.Init.FlashSize = 7; //31
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 */
}void ReadSampleData(uint8_t address, uint8_t *data, uint32_t length)
{
uint8_t tmpQspiAddr;
uint32_t tmpQspiNbData;
QSPI_CommandTypeDef QSPICmdRead;
tmpQspiAddr = 0b0;
tmpQspiNbData = (length);
//Instruction phase
QSPICmdRead.Instruction = 0x02;
QSPICmdRead.InstructionMode = QSPI_INSTRUCTION_4_LINES;
//Address phase
QSPICmdRead.Address = tmpQspiAddr;
QSPICmdRead.AddressMode = QSPI_ADDRESS_4_LINES;
QSPICmdRead.AddressSize = QSPI_ADDRESS_8_BITS;
//Alternate phase
QSPICmdRead.AlternateBytes = 0xFF;
QSPICmdRead.AlternateBytesSize = QSPI_ALTERNATE_BYTES_16_BITS;
QSPICmdRead.AlternateByteMode = QSPI_ALTERNATE_BYTES_4_LINES;
//Dummy phase
QSPICmdRead.DummyCycles = 4;
//Data phase
QSPICmdRead.DataMode = QSPI_DATA_4_LINES;
QSPICmdRead.NbData = (0xFF+1);// tmpQspiNbData;
//Other configuration
QSPICmdRead.DdrMode = QSPI_DDR_MODE_DISABLE;
QSPICmdRead.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
QSPICmdRead.DdrHoldHalfCycle = QSPI_DDR_HHC_HALF_CLK_DELAY;
HAL_QSPI_Command(&hqspi, &QSPICmdRead, 100);
HAL_QSPI_Receive(&hqspi, data , 100);
}