数码管驱动

//smg.c 使用PCA
#include <STC12C5A60S2.H>
#include "intrins.h"
#define FOSC    12000000L
#define T400Hz  (FOSC / 12 / 400)

sfr PCAPWM0     =   0xf2;
sfr PCAPWM1     =   0xf3;

unsigned int  PCA_TEMP;
unsigned char code SMG_TRANSFORM[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xFF};
unsigned char SMG_DATA[4]={1,2,3,4};

void PCA_isr() interrupt 7
{
	  static unsigned char SMG_TEMP;
    CCF0 = 0;                       //Clear interrupt flag
    CCAP0L = PCA_TEMP;
    CCAP0H = PCA_TEMP >> 8;            //Update compare PCA_TEMP
    PCA_TEMP += T400Hz;
	
		if(SMG_TEMP==0)P2=0xFE;else if(SMG_TEMP==1)P2=0xFD;else if(SMG_TEMP==2)P2=0xFB;else if(SMG_TEMP==3)P2=0xF7;
		P0=SMG_TRANSFORM[SMG_DATA[SMG_TEMP]];
		SMG_TEMP=(SMG_TEMP+1)%4;
		//P2=0x0F;
}

void SMG_SPRINT(unsigned char SMG_COM,unsigned char SMG_NUM)
{
	SMG_DATA[SMG_COM]=SMG_NUM;
}

void SMG_INIT(void)
{
    CCON = 0;                       //Initial PCA control register
                                    //PCA timer stop running
                                    //Clear CF flag
                                    //Clear all module interrupt flag
    CL = 0;                         //Reset PCA base timer
    CH = 0;
    CMOD = 0x00;                    //Set PCA timer clock source as Fosc/12
                                    //Disable PCA timer overflow interrupt
    PCA_TEMP = T400Hz;
    CCAP0L = PCA_TEMP;
    CCAP0H = PCA_TEMP >> 8;            //Initial PCA module-0
    PCA_TEMP += T400Hz;
    CCAPM0 = 0x49;                  //PCA module-0 work in 16-bit timer mode and enable PCA interrupt

    CR = 1;                         //PCA timer start run
    EA = 1;
}

//smg.h
void SMG_INIT(void);
void SMG_SPRINT(unsigned char SMG_COM,unsigned char SMG_NUM);