main.c

使用DAC0832做的程控衰减器

#include <REG52.H>
#include "LCD1602.H"
#include "ZLG.H"
#include "DAC0832.H"

unsigned char Key;
unsigned char Amp;

void Delay(unsigned int t)
{
	do
	{
		TH0 = 0xDC;
		TL0 = 0x00;
		TR0 = 1;
		while ( !TF0 );
		TF0 = 0;
		TR0 = 0;
	} while (--t);
}

void main() {
	Amp=128;
	Delay(30); //延时300ms，等待ZLG7289 复位完毕
	ZLG7289_Init(1); //调用ZLG7289 的初始化函数
	Delay(100);
	//键盘测试
	EA = 0;
	IT0 = 1; //负边沿触发中断
	EX0 = 1; //允许外部中断
	EA = 1;
	ZLG7289_Reset();
	Delay(30);
	LCD_Initial();
	GotoXY(0,1);
	Print("Amp:");
	PrintNum(Amp);
	DAC2B(Amp,Amp);
	while (1) {
	}
}

void INT0_SVC() interrupt 0
{
	Key = ZLG7289_Key();
	if (Key==2) Amp--;
	if (Key==3) Amp++;
	GotoXY(0,1);
	Print("Amp:");
	PrintNum(Amp);
	DAC2B(Amp,Amp);
}