DAC8563: STM32H7 SPI problems

MARIO MAINO

Prodigy 70 points

Part Number: DAC8563

Hello! I tested my DAC8563 on a STM32H743 but it doesn't work (0V on A & B Channels)...

So I tried with an Arduino UNO and it's OK.
Times ago I used different STM MCU without problems (F4, F7).

This is STM SPI initialization code:

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void MX_SPI1_Init(void)
{
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_2EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 0x0;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  hspi1.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
  hspi1.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
  hspi1.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_01CYCLE;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

void MX_SPI1_Init(void)
{

  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_2EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 0x0;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  hspi1.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
  hspi1.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
  hspi1.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi1.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_01CYCLE;
  hspi1.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_02CYCLE;
  hspi1.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_ENABLE;
  hspi1.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
  hspi1.Init.IOSwap = SPI_IO_SWAP_DISABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }

}

After connecting a signal analyzer to H7 and sending init commands, I had:

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//...
    HAL_GPIO_WritePin(SYNC_DAC8563_GPIO_Port, SYNC_DAC8563_Pin, GPIO_PIN_SET);
    dac_reg_write(0x28, 0x0001); //reset DAC
    dac_reg_write(0x20, 0x0003); //power_up DAC
    dac_reg_write(0x38, 0x0001); //internal ref
    dac_reg_write(0x02, 0x0000);//gain a x 2, b x 2
    dac_reg_write(0x30, 0x0003); //deactivate load trigger
//...
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

//...

	HAL_GPIO_WritePin(SYNC_DAC8563_GPIO_Port, SYNC_DAC8563_Pin, GPIO_PIN_SET);
	dac_reg_write(0x28, 0x0001); //reset DAC
	dac_reg_write(0x20, 0x0003); //power_up DAC
	dac_reg_write(0x38, 0x0001); //internal ref
	dac_reg_write(0x02, 0x0000);//gain a x 2, b x 2
	dac_reg_write(0x30, 0x0003); //deactivate load trigger
//...

I checked supply voltage levels and all seems ok...
Can someone help me?

Thanks a lot and best regards,
Mario

over 3 years ago

0 MARIO MAINO over 3 years ago

Prodigy 70 points

Just a magnified view of the first command "dac_reg_write(0x28, 0x0001);"

0 Katlynne Jones over 3 years ago in reply to MARIO MAINO

TI__Mastermind 35738 points

Hi Mario,

Do you see the internal 2.5V reference on the VREF pin after writing your initialization commands? Can you try slowing your SPI clock speed and checking if the reference powers on or if you see the DAC outputs?

Best,

Katlynne Jones

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DAC8563: STM32H7 SPI problems