八个LED每个LED循环亮1s,用外部中断控制灯的循环方向
时间: 2023-06-26 19:07:19 浏览: 97
这个问题需要使用单片机来实现,下面是一个基于STM32F103C8T6单片机的示例代码:
```c
#include "stm32f10x.h"
// 定义LED的GPIO引脚
#define LED_PIN_1 GPIO_Pin_0
#define LED_PIN_2 GPIO_Pin_1
#define LED_PIN_3 GPIO_Pin_2
#define LED_PIN_4 GPIO_Pin_3
#define LED_PIN_5 GPIO_Pin_4
#define LED_PIN_6 GPIO_Pin_5
#define LED_PIN_7 GPIO_Pin_6
#define LED_PIN_8 GPIO_Pin_7
// 定义中断触发标志位和循环方向
volatile uint8_t flag = 0;
volatile uint8_t direction = 1;
// 初始化LED的GPIO引脚
void LED_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = LED_PIN_1 | LED_PIN_2 | LED_PIN_3 | LED_PIN_4 |
LED_PIN_5 | LED_PIN_6 | LED_PIN_7 | LED_PIN_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
// 初始化外部中断
void EXTI_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 配置中断源为PA0(USER按键引脚)
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
// 配置中断优先级为最高
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
// 外部中断处理函数
void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
flag = 1;
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
int main(void)
{
LED_GPIO_Init();
EXTI_Init();
while (1)
{
// 根据循环方向控制LED的亮灭
if (direction)
{
GPIO_SetBits(GPIOA, LED_PIN_1);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_2);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_3);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_4);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_5);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_6);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_7);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_8);
Delay(1000);
}
else
{
GPIO_SetBits(GPIOA, LED_PIN_8);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_7);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_6);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_5);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_4);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_3);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_2);
Delay(1000);
GPIO_SetBits(GPIOA, LED_PIN_1);
Delay(1000);
}
// 根据中断触发标志位更改循环方向
if (flag)
{
direction = !direction;
flag = 0;
}
}
}
```
在这个代码中,我们首先定义了八个LED的GPIO引脚和中断触发标志位和循环方向。然后在主函数中,我们进入一个无限循环,根据循环方向控制LED的亮灭,并在循环中判断中断触发标志位,当中断触发时,我们更改循环方向。最后,我们需要在外部中断处理函数中将中断触发标志位置为1,表示有中断触发。
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