hd7279.c

hd7279接口芯片适用于扩展键盘和led

#include<regx51.h>
#include"HD7279.h"

				 
uchar digit[5]={0,0,0,0,0} ;
uchar keynumber;
uchar cnt,k1,k2;
void main()
{ 	

	reset=0;
	delay1ms(10);
	reset=1;
	delay1ms(30);//reset接高电平时，HD7279大约要经过18-25ms的时间才会进入正常工作状态
	send_byte(CMD_RESET);//复位	
	send_byte(CMD_TEST);//测试
	delay1ms(3000);//延时3s
	send_byte(CMD_RESET);//清除显示



    cnt=0;
	keynumber=0xff;
	write7279(FLASH,0XFC);//1,2两位闪烁
	write7279(UNDECODER,0X08);//第1位显示‘—’
	write7279(UNDECODER+1,0X08);//第2位显示‘—’
	do
	{
		if(!key)
		{
			keynumber=read7279(CMD_READ);//读出键码
			write7279(DECODER1+1,keynumber/16);//读出高四位
			write7279(DECODER1,keynumber&0x0f);//读出低四位
			while(!key);//等待按键释放
			cnt=0;
		}
		cnt++;
	}while(keynumber!=0&&cnt<0x30000);//如果按键为0或超时进入下一步
	write7279(FLASH,0XFF);

	//下载数据但不译码演示
	write7279(UNDECODER+7,0X49);//第8位显示“三”
	delay1ms(1000);

	//循环左/右移
	for(k1=0;k1<23;k1++)
	{
		send_byte(RTR_CYCLE);
		delay1ms(200);
	}
	for(k1=0;k1<23;k1++)
	{
		send_byte(RTL_CYCLE);
		delay1ms(200);
	}

	//译码方式0，左移
	for(k1=0;k1<16;k1++)
	{
		send_byte(RTL_UNCYL);
		write7279(DECODER0,k1);
		delay1ms(200);
	}
		delay1ms(1000);
		send_byte(CMD_RESET);//清除显示

	//译码方式1，右移
	for(k1=0;k1<16;k1++)
	{
		send_byte(RTR_UNCYL);
		write7279(DECODER1+7,k1);
		delay1ms(200);
	}
		delay1ms(1000);
		send_byte(CMD_RESET);//清除显示

	//消隐指令
	k2=0xff;
   	for(k1=0;k1<6;k1++)
	{
		k2=k2/2;//右移
		write7279(BLINK,k2);
		delay1ms(200);
	}
		write7279(BLINK,0XFF);//恢复8位显示
		delay1ms(1000);
		send_byte(CMD_RESET);//清除显示


	//段点亮段
	for(k1=0;k1<64;k1++)
	{	
		write7279(SEG_ON,k1);	//将64段逐一点亮
		write7279(SEG_OFF,k1-1);//关闭前一段
		delay1ms(200);
	}
}