display.c

频率测量程序

#define DisPlay_GLOBALS
#include<includes.h>
void DisNum(Uchar Bit,Uchar Num)    
{
  write7279(DECODE1+Bit,Num);		// 在第Bit(0-7)位显示Num  
}
void write7279(unsigned char cmd, unsigned char dta)
{
	send_byte (cmd);
	send_byte (dta);
}	

void send_byte(	unsigned char out_byte)
{
	unsigned char i;
	cs=0;
	long_delay();
	for (i=0;i<8;i++)
	{
		if (out_byte&0x80)
		{	
			dat=1;
		}
		else
		{
			dat=0;
		}
		clk=1;
		short_delay();
		clk=0;
		short_delay();
		out_byte=out_byte*2;
	}
	dat=0;
}
void long_delay(void)
{
	unsigned char i;
	for (i=0;i<0x30;i++);
}

void short_delay(void)
{
	unsigned char i;
	for (i=0;i<8;i++);
}

// ************************* 延时 n*10ms *************************
void delay10ms(unsigned char time)
{
	unsigned char i;
	unsigned int j;
	for (i=0;i<time;i++)
	{
		for(j=0;j<0x390;j++)
		{
           _nop_();
		   _nop_();
           _nop_();
		   _nop_();
		}
	}
}