display.c

来自「M8+1302+18b20+8位数码管的sch和gcc源程序」· C语言 代码 · 共 43 行

#define display_c
#include "main.h"
/*
共阴4位一体数码管
上 1   2   3   4    5   6
   s1  a   f   s2   s3  b   
下 1   2   3   4    5   6
   e   d   dp  c    g   s4
msb=p,lsb=a.顺序为pgfedcba
*/
SIGNAL (SIG_OVERFLOW0)
{
	uchar i=0;
	uchar data_seg=display_buffer[display_count];
	uchar data_bit=~(1<<display_count);
	if((1<<display_count)==flash_control) data_bit|=flash_var;
	display_count++;
	if(8==display_count) display_count=0;
//送位选
	for(i=0;i<8;i++)
	{
		if(data_bit&0x80) set_hc595_ser();
		else clr_hc595_ser();
		clr_hc595_srclk();
		set_hc595_srclk();	
		data_bit<<=1;
	}
//送段码
	for(i=0;i<8;i++)
	{
		if(data_seg&0x80) set_hc595_ser();
		else clr_hc595_ser();		
		clr_hc595_srclk();
		set_hc595_srclk();
		data_seg<<=1;
	}
	clr_hc595_srclk();
	clr_hc595_rclk();
	set_hc595_rclk();
	clr_hc595_rclk();
	TCNT0=t0_tcnt;//定时10ms
}