不懂51HEI論壇里有沒有人發過，我是從別的地方拿來的分享給大家。
單片機源程序如下:
- #include "led.h"
- #include "delay.h"
- #include "sys.h"
- #include "pwm.h"
- int main(void)
- { u16 led0pwmval=150;
- u16 led1pwmval=150;
- u16 led2pwmval=150;
- u16 led3pwmval=150;
- u8 dir=1;
- u16 math=0;
- delay_init(); //延時函數初始化
- LED_Init(); //初始化與LED連接的硬件接口
- TIM3_PWM_Init(899,0);//不分頻。PWM頻率=72000/(899+1)=80Khz
- while(1)
- {
- delay_ms(10);
- math++;
- if(math)
- {
- delay_ms(10);
- if(dir)
- {led0pwmval++;led1pwmval++;led2pwmval++;led3pwmval++;}
- else {led0pwmval--;led1pwmval--;led2pwmval--;led3pwmval--;}
- if(led0pwmval>600||led1pwmval>600||led2pwmval>600||led3pwmval>600) dir=0;
- if(led0pwmval==0||led1pwmval==0||led2pwmval==0||led3pwmval==0) dir=1;
- math=0;
- }
- TIM_SetCompare1(TIM3,led0pwmval);
- TIM_SetCompare2(TIM3,led1pwmval);
- TIM_SetCompare3(TIM3,led2pwmval);
- TIM_SetCompare4(TIM3,led3pwmval);
- }
- }
所有資料51hei提供下載:
TIM3四路 PWM輸出實驗.rar
(279.67 KB, 下載次數: 91)
2018-5-14 02:49 上傳
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