标题: 自己写的STM8S PWM输出程序 用的是TIM1中间对齐方式 [打印本页]
作者: 叫我红领巾    时间: 2018-7-18 21:44
标题: 自己写的STM8S PWM输出程序 用的是TIM1中间对齐方式
用的是TIM1 中间对齐方式


单片机源程序如下:
  1. /*边沿对齐PWM CH1输出*/
  2. /*注意：LCD R/W引脚需要硬件接地 若要软件接地则GPIO初始化内定义*/

  4. #include"iostm8s208mb.h"

  6. #define uchar unsigned char
  7. #define uint unsigned int
  8. #define ulong unsigned long

  10. void delay(uint z) //约1ms延时
  11. {
  12.   uint i,j;
  13.   while (z--)
  14.   {
  15.     for(i=0;i<50;i++)
  16.       for(j=0;j<20;j++);
  17.   }
  18. }

  20. void CH1_PWM_SET(ulong SET_CH1,float Duty_CH1)//改变占空比
  21. {
  22.   float a;
  23.   a=Duty_CH1*SET_CH1;
  24.   TIM1_CCR1H=((uint)(a))/256;
  25.   TIM1_CCR1L=((uint)(a))%256;
  26.   TIM1_CCMR1|=0x60;
  27.   TIM1_CCER1&=0xfd;
  28.   TIM1_CCER1|=0x01;
  29.   TIM1_OISR|=0x01;
  30. }

  32. void CH2_PWM_SET(ulong SET_CH2,float Duty_CH2)//改变占空比
  33. {
  34.   float a;
  35.   a=Duty_CH2*SET_CH2;
  36.   TIM1_CCR2H=((uint)(a))/256;
  37.   TIM1_CCR2L=((uint)(a))%256;
  38.   TIM1_CCMR2|=0x60;
  39.   TIM1_CCER1&=0xdf;
  40.   TIM1_CCER1|=0x10;
  41.   TIM1_OISR|=0x04;
  42. }

  44. void CH3_PWM_SET(ulong SET_CH3,float Duty_CH3)//改变占空比
  45. {
  46.   float a;
  47.   a=Duty_CH3*SET_CH3;
  48.   TIM1_CCR3H=((uint)(a))/256;
  49.   TIM1_CCR3L=((uint)(a))%256;
  50.   TIM1_CCMR3|=0x60;
  51.   TIM1_CCER2&=0x3d;
  52.   TIM1_CCER2|=0x01;
  53.   TIM1_OISR|=0x10;
  54. }

  56. void TIM1_PWM_SET(ulong PWM_SET)//改变周期
  57. {
  58. //  PWM_SET=(PWM_SET/2); //改变和边沿对齐一样的频率
  59.   TIM1_ARRH=PWM_SET/256;
  60.   TIM1_ARRL=PWM_SET%256;
  61.   TIM1_CR1|=0x60;
  62.   CH1_PWM_SET(PWM_SET,0.2);
  63.   CH2_PWM_SET(PWM_SET,0.4);
  64.   CH3_PWM_SET(PWM_SET,0.6);
  65.   TIM1_CR1|=0x01;
  66.   TIM1_BKR|=0x80;
  67. }

  69. void main(void)
  70. {
  71.   CLK_CKDIVR=0x00;
  72.   delay(10);
  73.   TIM1_PWM_SET(16000);
  74.   while(1);
  75. }
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