Hello everyone, which low cost (I mean price and power) mcu can I use for SDMMC1 ?

[HHako.1]

Hello everyone,

I would like to use SDMMC1 with some low cost mcu with cortex m3 or m4 processor. Who have such experience, could you please share with your experience ? At moment I am using F746ZGT6 and it works great. I have decided to migrate to L452 but it doesn't work with the same configuration which I am using for F746ZGT6.

[AScha.3]

so you want some recommendation for >> with the same configuration which I am using << , but you do not give any description for ?

ok, wait, i am looking for my big blue glass ball ...

[HHako.1]

I am using SDMMC with DMA RX, TX not RTOS, 50mhz clock, 32gb, v10 sd card.

here is my sd writing function. In case of L452 I got disk filure and timeout.

void write_sd(uint32_t * data_send)

{

if(f_mount(&SDFatFS, (TCHAR const*)SDPath, 0) != FR_OK)

         {

       char *str0 = "Mounting Error\r\n";

           HAL_UART_Transmit(&huart2, (uint8_t *)str0, strlen(str0), 100);

           Error_Handler();

         }

         else

         {

            //Open file for writing (Create)

             if(f_open(&SDFile, "STM32.txt", FA_OPEN_APPEND | FA_WRITE) != FR_OK)

             {

                char *str2 = "Opening Error\r\n";

               HAL_UART_Transmit(&huart2, (uint8_t *)str2, strlen(str2), 100);

               Error_Handler();

             }

             else

             {

               //Write to the text file

               res = f_write(&SDFile, data_send, BUFFER_SIZE, (void *)&byteswritten);

               if((byteswritten == 0) || (res != FR_OK))

               {

                char *str4 = "Writing from main Error\r\n";

                HAL_UART_Transmit(&huart2, (uint8_t *)str4, strlen(str4), 100);

                 Error_Handler();

               }

               else

               {

                  char bbb[32];

                  sprintf(bbb, "bytes written %ld\n", byteswritten);

                 HAL_UART_Transmit(&huart2, (uint8_t *)bbb, strlen(bbb), 100);

                  char *str5 = "Writed!\r\n";

                 HAL_UART_Transmit(&huart2, (uint8_t *)str5, strlen(str5), 100);

                 f_close(&SDFile);

               }

             }

         }

        f_mount(&SDFatFS, (TCHAR const*)NULL, 0);

}

[AScha.3]

Is SD card working with L452 ?

F_mount, open, read file?

1or4 bit mode? Did you test speed?

[Tesla DeLorean]

The L452 should be capable.

You'd need to debug the DISKIO layer, the top level code's going to reveal very little.

[HHako.1]

For L452 both 4bit and 1bit can do f_mount and then can't f_open.

[AScha.3]

so you have no working connection on L452.

check connections and clock/speed settings;

try 1 bit mode at first.