STC32G单片机PWM测脉冲周期源代码

ID:105449 · 发表于 2022-12-20 13:31

我验证了一下用STC32G PWM测试脉冲周期，源代码如下：
/*main.c
  Designed by Bill Liu
  Version 0.0
  Modified last by Bill Liu , 12/20/2022
*/

#include "main.h"
#include "STC32G_Delay.h"

ui8 str[20] = {0};
ui32 nPusle = 0;

ui16 tem1, tem2;
ui16 capold;
ui16 capnew;

void PWMA_ISR() interrupt 26
{
      if(PWMA_SR1 & 0x02)
      {
            capold = capnew;
            capnew =PWMA_CCR1H;
            capnew = (capnew << 8) + PWMA_CCR1L;
            nPusle = capnew - capold;
            PWMA_SR1 &= ~0x02;
      }
}

void main()
{
      SysInit();
      Uart1_Init(VBAUD_8BITS,G1, 0, 9600);
      STC32G_P3MODE_BIIO(PIN5);
      T0ClkOutInit(3000);
      TR0 = 1;

      P0M1 = 0x00;
      P0M0 = 0x00;
      P1M1 = 0x00;
      P1M0 = 0x00;

      PWMA_ENO = 0x00;
      PWMA_PS = 0x00;
      PWMA_CCMR1 = 0x01;
      PWMA_SMCR = 0x56;
      PWMA_CCER1 = 0x01;

      //PWMA_IER = 0x02;
      PWMA_CR1 = 0x00;
      PWMA_CR1 |= 0x01;
      //EA =1;

      while(!(PWMA_SR1 & 0x02));
      tem1 = PWMA_CCR1H;
      tem1 <<=       8;
      tem1 += PWMA_CCR1L;
      PWMA_SR1 &=  ~0x02;
      while(!(PWMA_SR1 & 0x02));                            tem2 = PWMA_CCR1H;
      tem2 <<=       8;
      tem2 += PWMA_CCR1L;
      PWMA_SR1 &=  ~0x02;
      nPusle = tem2 -tem1;

      while(1)
      {
            LongToString(nPusle,str);
            Uart1_SendString(str);
            Uart1_SendString("\r\n");
            Delayxms(1000);
      }
}
//End of main()

在出口助手上看到的结果如下（单片机的试钟周期为30MHz）：

ID:1042619 · 发表于 2022-12-22 11:37

感谢楼主精彩分享！也可以参考STC32G12K128实验箱范例程序第80个（高级PWM输出-周期可调、脉冲计数），需要样品等支持请联系我

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STC32G单片机PWM测脉冲周期源代码

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