stm32周期性跑马灯
时间: 2023-05-27 15:03:59 浏览: 51
下面是一个基于STM32的周期性跑马灯代码实现:
```
#include "stm32f10x.h"
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
int main(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_TIM1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 999; //设置周期为1000
TIM_TimeBaseStructure.TIM_Prescaler = 719; //设置预分频器(系统频率为72MHz时)
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 499; //设置占空比为50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
while(1)
{
GPIO_SetBits(GPIOC, GPIO_Pin_8); //LED1亮
delay_ms(250);
GPIO_ResetBits(GPIOC, GPIO_Pin_8); //LED1灭
GPIO_SetBits(GPIOC, GPIO_Pin_9); //LED2亮
delay_ms(250);
GPIO_ResetBits(GPIOC, GPIO_Pin_9); //LED2灭
GPIO_SetBits(GPIOC, GPIO_Pin_10); //LED3亮
delay_ms(250);
GPIO_ResetBits(GPIOC, GPIO_Pin_10); //LED3灭
GPIO_SetBits(GPIOC, GPIO_Pin_11); //LED4亮
delay_ms(250);
GPIO_ResetBits(GPIOC, GPIO_Pin_11); //LED4灭
}
}
void delay_ms(u16 nms)
{
u32 i;
for(i = 0; i < nms; i++)
{
u16 j = 1000;
while(j--);
}
}
```
该程序使用了TIM1作为时基,GPIOC作为输出口控制LED灯的亮灭状态。通过设置TIM1的预分频器和周期,可以控制时基的频率,从而控制LED灯的闪烁频率。同时,使用delay_ms函数实现了所谓的“死循环延迟”,从而控制LED灯亮灭时间的精度。
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