CODEWITHSUNDEEP
stm32
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Reputation: 621

STM32L0+ PA0 PIN High

I am not sure, if this forum is right place to post such questions, but me as a beginner in STM32 facing the following problem. I have connected LED to PA0 pin in nucleo STM32L073RZ board. This is a main.c code, which I compile and flash board:

#include “stm32l0xx_hal.h” 
int main(void){

volatile uint32_t *GPIOA_MODER=0x0, *GPIOA_ODR=0x0;

GPIOA_MODER = (uint32_t*)0x50000000; //GPIOA MODER Address
GPIOA_ODR = (uint32_t*)(0x50000000+0x14); //GPIOA ODR register 0x14 offset

HAL_Init();
__HAL_RCC_GPIOA_CLK_ENABLE();

*GPIOA_MODER = *GPIOA_MODER | 0x1; // Set MODER[1:0] =0x1 Output Mode
*GPIOA_ODR = *GPIOA_ODR | 0x1; // Set ODR[0]=0x1, Pulls PA0 high
while(1);
}

Kindly advice , what I am doing wrong as LED doesn’t go HIGH.

BR

Upvotes: 1

Views: 1212

Answers (1)

followed Monica to Codidact
followed Monica to Codidact

Reputation: 8069

In the STM32L0 and STM32L4 series, GPIO pins are initialized to analog mode at reset.enter image description here

Therefore you should clear some bits first:

*GPIOA_MODER = (*GPIOA_MODER & ~0x03) | 0x1; // Set MODER[1:0] =0x1 Output Mode

Upvotes: 1

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