EMMC64G-W525-X01U is not working with STM32F429ZI.

[AH_nt]

I am reading Data from 8 ADC- ADS8688 and writing to EMMC64G-W525-X01U with Queue of 100 and Block 512 at 1000 sample/sec.

I use below function for data writing and API file is attached below.

HAL_StatusTypeDef HAL_MMC_WriteBlocks(MMC_HandleTypeDef *hmmc, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks, uint32_t Timeout)

It runs for 5 min at 400 sample/sec after that it stops writing data and goes to below error.

else if(__HAL_MMC_GET_FLAG(hmmc, SDIO_FLAG_TXUNDERR))

   {

     /* Clear all the static flags */

     __HAL_MMC_CLEAR_FLAG(hmmc, SDIO_STATIC_FLAGS);

     hmmc->ErrorCode |= HAL_MMC_ERROR_TX_UNDERRUN;

     hmmc->State = HAL_MMC_STATE_READY;

     return HAL_ERROR;

   }

[Tesla DeLorean]

Those look to be the stock driver files, more interesting would be how you're using them, and how you're initializing the interface.

The error suggests you're not moving data quick enough. Try less aggressive clock on the SDIO, or review the relative clock speeds in the system.

[AH_nt]

1. we are presently using divider 250 for data write is already very low.

hmmc.Instance = SDIO;

 hmmc.Init.ClockEdge = SDIO_CLOCK_EDGE_RISING;

 hmmc.Init.ClockBypass = SDIO_CLOCK_BYPASS_DISABLE;

 hmmc.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_DISABLE;

 hmmc.Init.BusWide = SDIO_BUS_WIDE_1B;

 hmmc.Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_DISABLE;

 hmmc.Init.ClockDiv = 250;

 if (HAL_MMC_Init(&hmmc) != HAL_OK)

 {

   _Error_Handler(__FILE__, __LINE__);

 }

 if (HAL_MMC_ConfigWideBusOperation(&hmmc, SDIO_BUS_WIDE_8B) != HAL_OK)

 {

   _Error_Handler(__FILE__, __LINE__);

 }

2.We have not used DS(Data Strobe) pin in design for emmc, SDIO interface, which is shown in below picture.

[Tesla DeLorean]

Do you have a USART that can be used for debug input/output? Enumerate USART and PINs

[AH_nt]

We are using with JTAG on PCB for Debug.

[AH_nt]

We have also used USB_HS.