I am using NUCLEO-H723ZG and I am trying to use SPI the spi3 as SPI MASTER to the SPI SALVE device without success using DMA. I see the perfect data in the MISO line, But I unable to receive it into the "rx_buf", always "ZERO".

[ESega.1]

static void MX_SPI1_Init(void)

{

/* SPI3 parameter configuration*/

SpiHandle.Instance = SPI1;

SpiHandle.Init.Mode = SPI_MODE_MASTER;

SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;

SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;

SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;

SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;

SpiHandle.Init.NSS = SPI_NSS_HARD_OUTPUT;

SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;

SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;

SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;

SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;

SpiHandle.Init.CRCPolynomial = 0x0;

SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;

SpiHandle.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;

SpiHandle.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;

SpiHandle.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;

SpiHandle.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;

SpiHandle.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_02CYCLE;

SpiHandle.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_02CYCLE;

SpiHandle.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;

SpiHandle.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;

SpiHandle.Init.IOSwap = SPI_IO_SWAP_DISABLE;

if (HAL_SPI_Init(&SpiHandle) != HAL_OK)

{

 Error_Handler();

}

}

uint8_t mcp23s17_read_reg(uint8_t reg, uint8_t hw_addr)

{

  uint8_t control_byte = get_spi_control_byte(READ_CMD, hw_addr);

  uint8_t tx_buf[7] = {control_byte, reg ,0};

  uint8_t rx_buf[3] = {0, 0 ,0};

switch(HAL_SPI_TransmitReceive(&SpiHandle, (uint8_t*)tx_buf, (uint8_t *)rx_buf,(uint16_t) 3, 5000))

{

 case HAL_OK:

  break;

 case HAL_TIMEOUT:

  Timeout_Error_Handler();

  break;

 case HAL_ERROR:

  Error_Handler();

  break;

 default:

  break;

}

 // return the data

 return rx_buf[0];

}