STM32G474RE PC13 GPIO configuration

[Manu Abraham]

Hi All,

I have been trying to configure PC13 on the STM32G474 as a regular GPIO, but havent been successful yet.

Can someone suggest what could be done ?

Thanks,

Manu

int main(void)
{
	LL_GPIO_InitTypeDef gpio = {0};
 
	LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);
	LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
	NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
 
	LL_PWR_DisableDeadBatteryPD();
	SystemClock_Config();
 
 
//
//	PC.13 as regular GPIO
//	OSEL[1:0]=0			LL_RTC_ALARMOUT_DISABLE
//	TAMPOE=0
//	COE=0
//	TAMP1E=0
//	TSE=0
 
	LL_RTC_SetAlarmOutEvent(RTC, LL_RTC_ALARMOUT_DISABLE);	/* OSEL[1:0]=0 */
	LL_RTC_DisableTamperOutput(RTC);			/* TAMPOE=0 */
	LL_RTC_DisableOutput2(RTC);				/* COE=0 */
	LL_RTC_TAMPER_Disable(RTC, LL_RTC_TAMPER_1);		/* TAMP1E=0 */
	LL_RTC_TS_Disable(RTC);					/* TSE */
 
 
	gpio.Pin	= LL_GPIO_PIN_13;			/* PC.13 -> LCD_D/C */
	gpio.Mode	= LL_GPIO_MODE_OUTPUT;			/* Output MODE */
	gpio.Speed	= LL_GPIO_SPEED_FREQ_MEDIUM;
	gpio.OutputType	= LL_GPIO_OUTPUT_PUSHPULL;		/* Push Pull output */
	gpio.Pull	= LL_GPIO_PULL_DOWN;			/* NO pullup */
	LL_GPIO_Init(GPIOC, &gpio);
 
	while (1) {
		LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
		LL_mDelay(250);					/* Insert delay 250 ms */
	}
}
 

[waclawek.jan]

> I have been trying to configure PC13 on the STM32G474 as a regular GPIO, but havent been successful yet.

How do you observe it?

What is your hardware?

Any other pin works?

JW

[Manu Abraham · Accepted solution]

Hi waclawek jan,

My head was in knots.

The problem appears to have magically solved .. Weird it is ..

The missing magic was that I forgot to enable the Peripheral clocks. :(

Sorry about the noise.

Thanks for the quick response.

Manu