Serial Communication Method 1 Programming

Send a character X to the serial port debugging assistant on the host computer. After receiving the character, the MCU returns the "I get X" to the host computer. The serial port baud rate is set to 9600bps.

# Include <reg52.h>
# Define uchar unsigned char
Unsigned char flag, A, I;
Uchar code table [] = "I get ";
Void Init ()
{
Tmod = 0x20; // set the T1 timer Working Mode 2
Th1 = 0xfd; // Initial Value of T1 Timer
TL1 = 0xfd;
Tr1 = 1; // start the T1 Timer
Ren = 1; // allow serial port Mode 1
Sm0 = 0; // set the serial port Mode 1
SM1 = 1;
Ea = 1; // total disconnection
Es = 1; // enable serial port interruption
}


Void main ()
{
Init ();
While (1)
{
If (flag = 1)
{
Es = 0;
For (I = 0; I <8; I ++)
{
Sbuf = table [I];
While (! Ti );
Ti = 0;
}
Sbuf =;
While (! Ti)
Ti = 0;
Es = 1;
Flag = 0;
}
}
}


Void Ser () interrupt 4
{
Ri = 0;
A = sbuf;
Flag = 1;
}