Posted on October 16, 2017 at 10:20
Hi
I'm new to ARM and i'm using stm32f103vet. I can work with GPIOs and turn LED on/off!
I have problem with external interrupts.I want to use PC13 to turn on LED.
PC13 is connected to a button and the LED is connected to PD
Thanks in advance
here is my code:
#include 'stm32f10x.h'
uint8_t ext_flag = 0;
void led_init(){
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; // | GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD,&GPIO_InitStructure);
GPIOD -> ODR ^= GPIO_Pin_12;
}
void ext_init(){
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOC,&GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource13);
EXTI_InitStructure.EXTI_Line = EXTI_Line13;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_EnableIRQ(EXTI15_10_IRQn);
}
void delay(uint32_t delay_count){
while (delay_count) delay_count--;
}
void EXT15_10_IRQHandler(){
if(EXTI_GetITStatus(EXTI_Line13) != RESET)
{
ext_flag = 1;
EXTI_ClearITPendingBit(EXTI_Line13);
}
}
void main(){
led_init();
ext_init();
while(1){
if(ext_flag == 1)
{
GPIOD -> ODR ^= GPIO_Pin_12;
ext_flag = 0;
}
delay(500000);
}
}
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