配置PCA的一点总结12单片机

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先看代码

#include "stc12.h"unsigned int Last_Capture_Data=0; unsigned int New_Capture_Data=0;  unsigned int g_Period=0;      unsigned int g_Frequency=0;  unsigned char str1[12];unsigned char str2[12]; bit Capture_over = 0;sbit KEY_1 = P2^7;extern void InitLcd1602();extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str);void Delay50ms();void PCA_Init (bit module);void IntToString(unsigned char *str, unsigned int dat);void main (void){    PCA_Init(0);    InitLcd1602();    P2 = 0xF7;    while(1)    {        if(!KEY_1)        {            Delay50ms();            if(!KEY_1)                  {                while(!KEY_1);                CCAPM0 = 0x11;                CR = 1;            }        }        if(Capture_over)        {            Capture_over = 0;//                           g_Frequency = (long)1000000 / g_Period;             g_Frequency = (long)11059200 / (g_Period * 12);            IntToString(str1, g_Period);            IntToString(str2, g_Frequency);            LcdShowStr(1, 0, "length:");            LcdShowStr(8, 0, str1);            LcdShowStr(1, 1, "freque:");            LcdShowStr(8, 1, str2);        }    }}void PCA_Init (bit module){    //CIDL    -       -       -       CPS2    CPS1    CPS0    ECF    CMOD = 0x80;    //CF      CR      -       -       -       -       CCF1    CCF0    CCON = 0x00;    if (module == 0)                    {        CCAPM0 = 0x10;        CCAP0L = 0x00;        CCAP0H = 0x00;    }    else                                     {        CCAPM1 = 0x11;        CCAP1L = 0x00;        CCAP1H = 0x00;    }    CL = 0x00;                    CH = 0x00;    EA = 1;    //CR = 1;                     }void IntToString(unsigned char *str, unsigned int dat){    unsigned char buf[12];    unsigned char i = 0;    do{        buf[i++] = dat % 10;        dat /= 10;     }while(dat > 0);    while(i-- > 0)    {        *str++ = buf[i] + '0';//数组转换成ASCII反向拷贝到字符串指针    }    *str = '\0';}void PCA_Int(void) interrupt 7{    if (CCF0)                       {        CCF0 = 0;         if(Last_Capture_Data == 0)        {              Last_Capture_Data = CCAP0H;               Last_Capture_Data = (Last_Capture_Data << 8) + CCAP0L;         }        else         {                        New_Capture_Data = CCAP0H;                     New_Capture_Data = (New_Capture_Data << 8) + CCAP0L;            g_Period = New_Capture_Data - Last_Capture_Data;            CR = 0;            CCAPM0 = 0x10;            Last_Capture_Data=0;              CCAP0L = 0x00;            CCAP0H = 0x00;            CL = 0x00;                             CH = 0x00;            Capture_over = 1;        }    }}void Delay50ms()        //@11.0592MHz{    unsigned char i, j, k;    i = 3;    j = 26;    k = 223;    do    {        do        {            while (--k);        } while (--j);    } while (--i);}

配置流程：

CMOD 设置禁止溢出中断

设置CCAPMx设置开启捕获中断，以及上升沿捕获还是下降沿捕获

清零CCnPL、CCnPH以及CH、CL

这里写图片描述

其实最重要的还得看手册，介绍的真心很详细！！！

一个非常详细的电路图，分分享一下：

这里写图片描述

很明显，图的意思就是设置好上升沿捕获或者下降沿捕获后，由于CL、CH
一直在走，一旦满足条件就把CL./CH的值分别装入CCAPL以及CCAPH中，如果此时使能PCA中断的话，会触发中断进入中断。

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