SDIO and TFTctrl mapping collison?

Tamas Novak · ‎2014-07-06

Posted on July 06, 2014 at 11:48

Hi, guys,

please reassure me if I missed something.

I wanted to use SDIO and TFT LCD driver module at the same time on a 144-pin STM32F429 of my own design..but it seems I can't

Both SDIO_D2 and LCD_R2 signals can only be mapped to PC10 pin. SD card could be used in 1bit mode..but I want 4bit access for speed, so I need SDIO_2.

Any idea on a workaround?

regards,

Tommy

#port-mapping-stm32f429-sdio-tft

Tesla DeLorean · ‎2014-07-06

Posted on July 06, 2014 at 13:07

It's not you, ST made some frustratingly poor choices with their pin muxing strategy. You really need to consider higher pin count devices to get all the interfaces out.

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Tamas Novak · ‎2014-07-06

Posted on July 06, 2014 at 16:17

Thanks, Clive...it was hard to believe.

Especially because SD card reading + TFT driving can be considered twin functions. And there is only a single problem pin : SDIO_D0,_D1,_D3,_CK,_CMD are okay, SDIO_D2 and LCD_R2 are both un-remappably fixed to PC10.

On 176 pincount devices LCD_R2 may be mapped to PH8..I'm gonna use that instead.

cheers,

Tommy