FATFS f_write error (9) when SAI/DMA is running

[JulesSTM32]

Hello, 

I am trying to record audio data from an ADC to a SD card with a nucleo STM32L552ZET6QU board. To write data into SD card using FatFs I initialised it  : 

"// Open the file system - mount the drive

fres = f_mount(&FatFs, "", 1); // 1 = mount now

if (fres != FR_OK) {

myprint("f_mount error (%i)\r\n", fres);

while(1);

}

// Statistics from the SD card

DWORD free_clusters, free_sectors, total_sectors;

FATFS* getFreeFs;

fres = f_getfree("", &free_clusters, &getFreeFs);

if (fres != FR_OK) {

myprint("f_getfree error (%i)\r\n", fres);

while(1);

}

//Formula comes from ChaN's documentation

total_sectors = (getFreeFs->n_fatent - 2) * getFreeFs->csize;

free_sectors = free_clusters * getFreeFs->csize;

myprint("SD card stats:\r\n%10lu KiB total drive space.\r\n%10lu KiB available.\r\n", total_sectors / 2, free_sectors / 2);

// Open file

fres = f_open(&fil, "record.bin", FA_WRITE | FA_CREATE_ALWAYS);

if(fres == FR_OK)

{

myprint("I was able to open 'record.bin' for writing\r\n");

}

else

{

myprint("f_open error (%i)\r\n", fres);

}

float data[4] = {1.2, 1.6, -0.5, 3.2};

UINT bytesWrote;

fres = f_write(&fil, data, sizeof(data), &bytesWrote);

if(fres == FR_OK)

{

myprint("Wrote %i bytes to 'record.bin'!\r\n", bytesWrote);

}

else

{

myprint("f_write error (%i)\r\n", fres);

}"

Everything goes fine, except when the SAI is enabled with I2S mode coupled with DMA1 and initialise with this line of code : 

"HAL_StatusTypeDef status = HAL_SAI_Receive_DMA(&hsai_BlockA1, (uint8_t *)adcData, BUFFER_SIZE*4);" 

After that, I only get "f_write error (9)" when I try to write into my file created before.

There must be a conflict between SAI/DMA and FATFS but I couldn't resolve it.

SD card is linked to SPI3 which is on APB1, SAI1 is on APB2 and DMA1 is on AHB1.

My SD card is formated in FAT32.

What could be the problem?

[Saket_Om]

Hello @JulesSTM32 

---

@JulesSTM32 wrote:

I observed a diffence between my case an the tutorial : in CubeIDE, I don't have the window "DMA settings" in the SDMMC settings section.

I reported this issue internally for better analysis. However, you can usually set the DMA manually. See the code snippet below:

// Enable DMA clock
__HAL_RCC_DMA2_CLK_ENABLE();

// Configure DMA for SDMMC RX (Receive)
DMA_HandleTypeDef hdma_sdmmc_rx;
hdma_sdmmc_rx.Instance = DMA2_Channel4;
hdma_sdmmc_rx.Init.Request = DMA_REQUEST_SDMMC1; // SDMMC1 DMA request
hdma_sdmmc_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_sdmmc_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdmmc_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdmmc_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdmmc_rx.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdmmc_rx.Init.Mode = DMA_NORMAL;
hdma_sdmmc_rx.Init.Priority = DMA_PRIORITY_HIGH;

if (HAL_DMA_Init(&hdma_sdmmc_rx) != HAL_OK) {
    // Initialization Error
    Error_Handler();
}

// Link DMA RX handle to SDMMC handle
__HAL_LINKDMA(&hsd1, hdmarx, hdma_sdmmc_rx);

// Configure DMA for SDMMC TX (Transmit)
DMA_HandleTypeDef hdma_sdmmc_tx;
hdma_sdmmc_tx.Instance = DMA2_Channel5;
hdma_sdmmc_tx.Init.Request = DMA_REQUEST_SDMMC1; // SDMMC1 DMA request
hdma_sdmmc_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_sdmmc_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_sdmmc_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_sdmmc_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_sdmmc_tx.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_sdmmc_tx.Init.Mode = DMA_NORMAL;
hdma_sdmmc_tx.Init.Priority = DMA_PRIORITY_HIGH;

if (HAL_DMA_Init(&hdma_sdmmc_tx) != HAL_OK) {
    // Initialization Error
    Error_Handler();
}

// Link DMA TX handle to SDMMC handle
__HAL_LINKDMA(&hsd1, hdmatx, hdma_sdmmc_tx);

---

@JulesSTM32 wrote:

Moreover, in the video, there is nothing done to bind the SDMMC instance "hsd1" and FatFs. Is it normal? 

---

You can check the example to see how to do this. It should be similar to SPI in your previous setting.

[JulesSTM32]

I copied your code in my project, but I get some errors : 

../Core/Src/main.c:348:46: error: 'DMA_REQUEST_SDMMC1' undeclared (first use in this function); did you mean 'DMA_REQUEST_ADC1'?

348 | hdma_sdmmc_rx.Init.Request = DMA_REQUEST_SDMMC1; // SDMMC1 DMA request

../Core/Src/main.c:348:46: note: each undeclared identifier is reported only once for each function it appears in

In file included from ../Drivers/STM32L5xx_HAL_Driver/Inc/stm32l5xx_hal_rcc.h:27,

from ../Core/Inc/stm32l5xx_hal_conf.h:246,

from ../Drivers/STM32L5xx_HAL_Driver/Inc/stm32l5xx_hal.h:30,

from ../Core/Inc/main.h:30,

from ../Core/Src/main.c:20:

../Drivers/STM32L5xx_HAL_Driver/Inc/stm32l5xx_hal_def.h:73:17: error: 'SD_HandleTypeDef' has no member named 'hdmarx'

73 | (__HANDLE__)->__PPP_DMA_FIELD__ = &(__DMA_HANDLE__);

../Core/Src/main.c:363:17: note: in expansion of macro '__HAL_LINKDMA'

363 | __HAL_LINKDMA(&hsd1, hdmarx, hdma_sdmmc_rx);

../Drivers/STM32L5xx_HAL_Driver/Inc/stm32l5xx_hal_def.h:73:17: error: 'SD_HandleTypeDef' has no member named 'hdmatx'

73 | (__HANDLE__)->__PPP_DMA_FIELD__ = &(__DMA_HANDLE__);

../Core/Src/main.c:383:17: note: in expansion of macro '__HAL_LINKDMA'

383 | __HAL_LINKDMA(&hsd1, hdmatx, hdma_sdmmc_tx);

make: *** [Core/Src/subdir.mk:43: Core/Src/main.o] Error 1

"make -j12 all" terminated with exit code 2. Build might be incomplete.

[Saket_Om]

Hello @JulesSTM32 

The SDMMC on the STM32L5 embeds its own internal DMA, so there is no need to set a GPDMA.

[JulesSTM32]

Hello,

I still have f_mount error (3). I double check de software configuration and I have no idea how to resolve it. However HAL_SD_GetCardStatus() works.

Thanks, 

Jules.

[Saket_Om]

Hello @JulesSTM32 

Did you try to compare your config with the example Projects/STM32L552E-EV/Applications/FatFs/FatFs_uSD_DMA.

[JulesSTM32]

Hi,

I implemented the solution with SDMMC for SD card, but I still get f_write error (9) FR_INVALID_OBJECT.

Do you use FatFs in your project as well or do you only use the SDMMC drivers ? 

I would really appreciate if you could tell me more about your project.

[AScha.3]

Hi,

1. SDMMC with fatfs , sure.

2. set it to 1-bit mode (at least for beginning ); read here in forum (my posts...) about : "sd-card"  ...hardware problems.

3. set SDMMC without DMA , uncheck "DMA template" .

4. DO NOT format (mkfs) and not write to card, only open + read existing files...until this working 100% perfect.

5. ...then try write.