keyadc.c

单片机汇编例程学习,大量的汇编例程

#include <Intrins.h>
#include <At89x51.h>

#define KEY_PORT P1
#define KEY1 0x81 //10000001b
#define KEY2 0x41 //01000001b
#define KEY3 0x21 //00100001b
#define KEY4 0x11 //00010001b
#define KEY5 0x82 //10000010b
#define KEY6 0x42 //01000010b
#define KEY7 0x22 //00100010b
#define KEY8 0x12 //00010010b
#define KEY9 0x84 //10000100b
#define KEY10 0x44 //01000100b
#define KEY11 0x24 //00100100b
#define KEY12 0x14 //00010100b
#define KEY13 0x88 //10001000b
#define KEY14 0x48 //01001000b
#define KEY15 0x28 //00101000b
#define KEY16 0x18 //00011000b
#define AD_CS P3_6
#define AD_WR P3_2
#define AD_RD P3_7
#define AD_INPUT_PORT P1
#define LOW 0
#define HIGH 1

unsigned char key_code_temp;
unsigned char code digital_led[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0x0f8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};

unsigned char Key_Scan(void);
void Delay_ms(unsigned char second);
void extint(void);

void Adc_Start(void);
unsigned char Adc_Read(void);
void Adc_Demo(void);

void main(void)
{
 EA=1;
 IT1=1;//ext1 edge trigger
 EX1=1; 	//enable int1
while(1)
 {
	key_code_temp=Key_Scan();
	Delay_ms(30);
	if(key_code_temp==Key_Scan())
	{
	while(Key_Scan());
	switch(key_code_temp)	
	{
	 case KEY1:{P0=0;P2_0=P2_1=P2_2=P2_3=0;} break;
	 case KEY2:{P2_0=P2_1=P2_2=P2_3=1;} break; 
	 case KEY3:{P3_3=1;EX1=1;} break;
	 case KEY4:Adc_Demo(); break;
	 case KEY5:P0_4=0; break;
	 case KEY6:P0_5=0; break;
	 case KEY7:P0_6=0; break;
	 case KEY8:P0_7=0; break;
	 case KEY9:P2_0=0; break;
	 case KEY10:P2_1=0; break;
	 case KEY11:P2_2=0; break;
	 case KEY12:P2_3=0; break;
	 case KEY13:P2_4=0; break;
	 case KEY14:{P2_5=0; P2_6=0;P2_7=0;}break;
	 case KEY15:P2=P3;break;
	 case KEY16:P2=0xff;break;
		default:break;
	}
	key_code_temp=0;
	}
  }
}

unsigned char Key_Scan(void)
{
unsigned char key_temp=0,i,j;
unsigned char scan_code_row=0x01,scan_code_colum=0x80;

	for(i=0;i<4;i++)
		{
			KEY_PORT=scan_code_row;
			if(KEY_PORT==0)
			{
	      for(j=0;j<4;j++)
				{
				KEY_PORT=scan_code_colum;
				if(KEY_PORT==0&&key_temp!=0)
				{KEY_PORT=0xff;	return key_temp=0;}
				else
				if(KEY_PORT==0)
				key_temp=scan_code_row|scan_code_colum;
			  scan_code_colum>>=1;
				}
			}
			scan_code_row<<=1;
		}
KEY_PORT=0xff;
return key_temp;
}

void Delay_ms(unsigned char second)
{
 unsigned char i,j;
 for(j=0;j<second;j++)
   for (i=0;i<124;i++)
   _nop_();
}

void Adc_Start(void)
{
	AD_CS=LOW;
	_nop_();
	AD_WR=LOW;
	_nop_();
	AD_WR=HIGH;
	_nop_();
	AD_CS=HIGH;
}

unsigned char Adc_Read(void)
{
unsigned char i;
	AD_INPUT_PORT=0xff;
	AD_CS=LOW;
	_nop_();
	AD_RD=LOW;
	_nop_();
	Delay_ms(1);
	i=AD_INPUT_PORT;
	_nop_();
	_nop_();
	AD_RD=HIGH;
	_nop_();
	AD_CS=HIGH;
	return i;
}

void Adc_Demo(void)
{
//unsigned char t1,t2;
//	AD_INPUT_PORT=0xf0;
	Adc_Start();
//	while(P3_3);
	Delay_ms(1);
	P0=Adc_Read();
	P2_0=0;       
	P2_1=0;
	P2_2=0;
	P2_3=0;

}
void extint(void) interrupt 2
{
	EX1=0;

	P0=digital_led[5];
	P2_0=~P2_0;       
	P2_1=~P2_1;
	P2_2=~P2_2;
	P2_3=~P2_3;
//	EA=1;
}