我有 smt32l1xx 板,下面的代码不起作用。调试器显示 pinA5 已设置,但连接到此引脚的二极管仍然不亮。我不知道为什么。即使我在设置位后添加延迟它也不起作用。二极管连接到板上的 PA5 和 GND。
#include <stm32l1xx.h>
#define ENABLE 1
#define DISABLE 0
void TIM2_IRQHandler() //interrupt
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
if (GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_5))
GPIO_ResetBits(GPIOA, GPIO_Pin_5); //LED OFF
else
GPIO_SetBits(GPIOA, GPIO_Pin_5); //LED ON <- im here and still nothing
}
}
int main(void)
{
/* gpio init struct */
GPIO_InitTypeDef gpio;
TIM_TimeBaseInitTypeDef tim;
NVIC_InitTypeDef nvic;
/* reset rcc */
RCC_DeInit();
RCC_APB2PeriphClockCmd(RCC_AHBENR_GPIOAEN, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
GPIO_StructInit(&gpio);
/* use pin 0 */
gpio.GPIO_Pin = GPIO_Pin_5;
/* mode: output */
gpio.GPIO_Mode = GPIO_Mode_OUT;
/* apply configuration */
GPIO_Init(GPIOA, &gpio);
TIM_TimeBaseStructInit(&tim); //timer
tim.TIM_CounterMode = TIM_CounterMode_Up;
tim.TIM_Prescaler = 64000 - 1;
tim.TIM_Period = 1000 - 1;
TIM_TimeBaseInit(TIM2, &tim);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
nvic.NVIC_IRQChannel = TIM2_IRQn; //interrupt
nvic.NVIC_IRQChannelPreemptionPriority = 0;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic);
while (1)
{
}
/* never reached */
return 0;
}