STM32F4的PWM输出如下- #include "sys.h"
- #include "delay.h"
- #include "usart.h"
- #include "led.h"
- #include "pwm.h"
- int main(void)
- {
- u16 led0pwmval=0;
- u8 dir=1;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2
- delay_init(168); //初始化延时函数
- uart_init(115200);//初始化串口波特率为115200
- TIM13_PWM_Init(500-1,84-1); //84M/84=1Mhz的计数频率,重装载值500,所以PWM频率为 1M/500=2Khz.
- while(1) //实现比较值从0-300递增,到300后从300-0递减,循环
- {
- delay_ms(10);
- if(dir)led0pwmval++;//dir==1 led0pwmval递增
- else led0pwmval--; //dir==0 led0pwmval递减
- if(led0pwmval>300)dir=0;//led0pwmval到达300后,方向为递减
- if(led0pwmval==0)dir=1; //led0pwmval递减到0后,方向改为递增
-
- TIM_SetCompare1(TIM13,led0pwmval); //修改比较值,修改占空比
- }
- }
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STM32F4的PWM输出.7z
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