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SDIO and TFTctrl mapping collison?

Tamas Novak
Associate III
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
2 REPLIES 2
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.

Tips, buy me a coffee, or three.. PayPal Venmo Up vote any posts that you find helpful, it shows what's working..
Tamas Novak
Associate III
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