SDIO,SD1bit,UART4 Disable.

[MShao.1]

I want to use uart4_tx and sdio at the same time.

But, in cubemx(6.2.1),

SDIO->Mode: SD 1 bit

UART4->Mode: only Disable.

[TDK]

If pins are shared between peripherals, and there are no alternatives, you cannot use them at the same time. Larger chips typically have more options.

[Tesla DeLorean]

Fails to mention part, package, or any actionable details.

[TDK]

And yet still includes more info than some other people.

It would be nice if questions were more curated. TI MSP430 forums get better questions, IMO.

[Khouloud OTHMAN]

Hello @MShao.1​,

First le me welcome you to the STM32 Community :smiling_face_with_smiling_eyes:

Could you please share your .ioc file to check from our side or at least precise which MCU are you using ?

It will be helpful to find faster the root cause of the problem if it exists.

Thanks in advance,

Khouloud.

[MShao.1]

STM32F103RCT6 LQFP64.

[MShao.1]

MCU:STM32F103RCT6 LQFP64.

Attachment is the ico file.

[TDK]

The STM32F1 family assigns pins on a per-peripheral basis rather than per-pin. Less ancient families do this on a per pin basis. So even though you aren't using SDIO_D2, it shares its functionality with UART4 and you can only have one enabled per the datasheet.

 

[MShao.1]

Now the problem is, even if I use the "HAL_SD_DeInit" function to turn off the SDIO clock, and then execute the uart4 initialization function, but uart4_ TX is still unable to send data.

		ret = HAL_SD_DeInit(&hsd);
//		RCC->AHBENR &= ~(1<<10);
//		SDIO->DCTRL &= ~(3<<10);
		osDelay(1000);
		uart4_init(36,250000);
		osDelay(1000);
		while((UART4->SR&0x40)==0);
		UART4->DR = 0x5A;

[TDK]

Is the pin initialized in the correct AF mode? Show the relevant registers.