STM32L4P5, working with sdmmc in dma mode possible?

[SYako]

Recently I swithc project to STM32L4P5CET as main mcu. I can't see any option to use sdmmc in dma mode (In stm32cubeide/mx). Is ST planning to add support later, or it's impossible?

[Tesla DeLorean]

Hardware is capable, do you need a demo?

[SYako]

Thank you. I'm so attached to stm32cubeide and just wondering is that possible(now I know that is possible). When such support will be added to stm32cubeide?

[TDK]

> When such support will be added to stm32cubeide?

Given the history of barely/almost working support of SD/MMC in HAL, I wouldn't hold your breath. It's been in the current state for at least a couple years. If it was a priority, it would have been done by now.

[SYako]

Hi, could you provide demo?

[Tesla DeLorean]

I'm using NUCLEO-L4P5ZG w/Keil and HAL

https://www.st.com/en/evaluation-tools/nucleo-l4p5zg.html

For custom board I'd need details of HSE clock, USART, LEDs, pins, etc.

[SYako]

Only MCU(STM32L4P5CET6) with SDMMC2 without HSE, I'm experimenting with FreeRTOS and SD card(FatFS).

Because of previous experience its only 1bit connection.

PB14 SDMMC2_D0

PB12 SDMMC2_CK

PA1 SDMMC2_CMD

[Tesla DeLorean]

I don't have hardware that replicates that. 1-bit is totally going to kill speed.

UART/Pins for output?

[SYako]

For debug I'm using Trace Asynchronous Sw:

PA13 - SWDIO

PA14 - SWCLK

PB3 - SWO

It's just a test, I had speed up to 3-4Mbits/s in blocking mode(no DMA) without FreeRTOS. Which is more than enough.

[SYako · Accepted solution]

Okey, I managed to port FatFS from other L4(non plus) MCU. For people reading this in future: STM32L4+ SDMMC has it own IDMA, there is no need to initialize DMA at all. Here is my test code: https://github.com/Maobuff/STM32L4P5CET_FATFS_SDMMC_DMA