GPIO ODR Register

Posted on July 09, 2017 at 20:32

Hello, 

Was doing some tests with the ODR register for GPIO and noticed that when I load it with 0xFFFF some pins (13-15 for GPIOA &GPIOC) were still off. I have them initialized so I am unsure why they won't come on. Wondering why this happens and how to overcome this. Also might there be an easier/faster/less trivial way to initialize all pins to the same for GPIOA/B/C?

Source Code:

&sharpinclude 'stm32f10x_gpio.h'

&sharpinclude 'stm32f10x_rcc.h'

GPIO_InitTypeDef GPIO_InitStructure;

int main(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_StructInit(&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;

GPIO_Init(GPIOA,&GPIO_InitStructure);

while(1)

{

GPIOA->ODR = 0xFFFF;

}

}

#odr #gpio