main.c

some reference exercise of C language

// Khai bao cac file header
#include	<AT89X52.H>
#include	<Kit8051.h>

// Khai bao cac bien toan cuc

// Khai bao cac ham
void InitSystem(void);

// Dinh nghia cac ham
void InitSystem(void)
{
	// Cam LCD
	LCD_E = 0;
	// Khoi tao cong noi tiep o che do 1 (di bo 8bit, baud rate thay doi duoc)
	SCON = 0x50;
	// Khoi tao Timer1 dung de tao Baud Rate
	TMOD = 0x20; //Che do 2, tu dong nap lai
	TH1 = 0xFD;
	TR1 = 1;
	// Cho phep ngat cong noi tiep
	ES = 1;
	EA = 1;
}
void SerialPortInterrupt(void) interrupt SIO_VECTOR
{
	unsigned char temp;
	// Kiem tra xem ngat la do nhan duoc du lieu hay truyen xong du lieu?
	if(RI==1)
	{
		RI = 0;
		// Doc du lieu nhan duoc tu bo dem
		temp = SBUF;
		// Truyen tra lai may tinh
		SBUF = temp+1;
	}
	else
	{
		TI = 0;
	}
}

// Chuong trinh chinh
void main(void)
{
	// Khoi tao he thong
	InitSystem();
	// Vong lap vo tan
	while(1);
}