text1.c

单片机快速入门原程序

#include <reg51.h>
#include<stdio.h>
Uart_Init();
sbit P10=0x90;
sbit P11=0x91;
sbit P12=0x92;
sbit P13=0x93;
sbit P14=0x94;
sbit P15=0x95;
sbit P16=0x96;
sbit P17=0x97;
int nKeyNumber;

void Key0_Handler();
void Key1_Handler();
void Key2_Handler();
void Key3_Handler();
void Key4_Handler();
void Key5_Handler();
void Key6_Handler();
void Key7_Handler();

main()
{ 	
	nKeyNumber=0xFF;
	EX0=1;
	EA=1;
	Uart_Init();
	while(1)
	{
		if(nKeyNumber==0xFF) 
			printf("No key pressed\n");
		else 
			switch(nKeyNumber)
			{	
				case(0x00):Key0_Handler();
							break;
				case(0x01):Key1_Handler();
							break;
				case(0x02):Key2_Handler();
							break;
				case(0x03):Key3_Handler();
							break;
				case(0x04):Key4_Handler();
							break;
				case(0x05):Key5_Handler();
							break;
				case(0x06):Key6_Handler();
							break;
				case(0x07):Key7_Handler();
							break;
			
			}

	}
}
Uart_Init()
	{SCON = 0x52;    /* 设置串行口控制寄存器SCON*/
	 TMOD = 0x20;    /* 12M时钟时波特率为2400  */
	 TCON = 0x69;    /* TCON */
	 TH1 =  0xf3;    /* TH1 */
	}
void int0() interrupt 0 using 0
{	if(P10==0)
			nKeyNumber=0x00;
	if(P11==0)
			nKeyNumber=0x01;
	if(P12==0)
			nKeyNumber=0x02;
	if(P13==0)
			nKeyNumber=0x03;
	if(P14==0)
			nKeyNumber=0x04;
	if(P15==0)
			nKeyNumber=0x05;
	if(P16==0)
			nKeyNumber=0x06;
	if(P17==0)
			nKeyNumber=0x07;
//	printf("External Interrupt 0 responded\n");
}
void Key0_Handler()
	{printf("key NO. 0 down\n");
	}
void Key1_Handler()
	{printf("key NO. 1 down\n");
	}
void Key2_Handler()
	{printf("key NO. 2 down\n");
	}
void Key3_Handler()
	{printf("key NO. 3 down\n");
	}
void Key4_Handler()
	{printf("key NO. 4 down\n");
	}
void Key5_Handler()
	{printf("key NO. 5 down\n");
	}
void Key6_Handler()
	{printf("key NO. 6 down\n");
	}
void Key7_Handler()
	{printf("key NO. 7 down\n");
	}