Http://hi.baidu.com/%D7%F6%B6%F8%C2%DB%B5%C0/blog/item/725053edc5cec62d27979143.html About the serial communication between two single-chip microcomputer. The requirements are as follows:
1. If the p1.0 port of the lower computer enters a low level, 0x01 is sent, and the upper computer outputs a high level in its p1.0 port;
2. If the p1.1 port of the lower computer enters a low level, 0x03 will be sent, and the upper computer will output a high level on its p1.1 port;
3. Only when both ports of the lower computer change to a high level can 0x07 be sent. The upper computer outputs a low level in both the p1.0 and p1.1 ports.
Reward score: 10-resolution time:
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Best Answer:
As required, the Proteus simulation circuit diagram is as follows:
Picture connection: http://hi.baidu.com/%D7%F6%B6%F8%C2%DB%B5%C0/album/item/d9581a5108d990171238c244.html#IMG=d9581a5108d990171238c244 In the figure, the upper computer completes serial reception and outputs high and low levels based on the received data. The program used is as follows:
// ================================================ ============
# Include <reg51.h> # Define xtal 11059200 // CPU crystal oscillator frequency
# Define baudrate 9600 // communication baud rate
# Define uchar unsigned char
# Define uint unsigned int Sbit k1 = p1 ^ 0; // define the port
Sbit k2 = p1 ^ 1; Void Init (void)
{
Scon = 0x50; // sets the working mode of the serial port.
Pcon & = 0x00; // The baud rate is not doubled.
Tmod = 0x20; // timer 1 works in 8-bit auto-Reload mode to generate a baud rate
Th1 = (unsigned char) (256-(xtal/(32l * 12l * baudrate )));
TL1 = (unsigned char) (256-(xtal/(32l * 12l * baudrate); // T1 assigns an initial value
Tr1 = 1; // start timer 1
Ie = 0x00; // disable any interruptions
// Ea = 1; // The total number of interruptions allowed
}
//-----------------------------------------------------------
Void main (void)
{
Init ();
While (1 ){
While (Ri = 0 );
Ri = 0;
If (sbuf = 0x01) k1 = 1;
If (sbuf = 0x03) k2 = 1;
If (sbuf = 0x07 ){
K1 = 0;
K2 = 0;
}}}
// ================================================ ============ In the figure, the lower computer completes input detection and sends different serial data. The program used is as follows:
// ================================================ ============
# Include <reg51.h> # Define xtal 11059200 // CPU crystal oscillator frequency
# Define baudrate 9600 // communication baud rate
# Define uchar unsigned char
# Define uint unsigned int Sbit k1 = p1 ^ 0; // define the port
Sbit k2 = p1 ^ 1;
//-----------------------------------------------------------
Void Init (void)
{
Scon = 0x50; // sets the working mode of the serial port.
Pcon & = 0x00; // The baud rate is not doubled.
Tmod = 0x20; // timer 1 works in 8-bit auto-Reload mode to generate a baud rate
Th1 = (unsigned char) (256-(xtal/(32l * 12l * baudrate )));
TL1 = (unsigned char) (256-(xtal/(32l * 12l * baudrate); // T1 assigns an initial value
Tr1 = 1; // start timer 1
Ie = 0x00; // disable any interruptions
// Ea = 1; // The total number of interruptions allowed
}
//-----------------------------------------------------------
Void main (void)
{
Bit t_1 = 0, T_2 = 0, T_3 = 0;
Init ();
//--------------------------------------------------
While (1 ){
If (k1 = 0) & (t_1 = 0 )){
T_1 = 1;
T_3 = 0;
Sbuf = 0x01;
While (Ti = 0 );
Ti = 0;
}
//-------------------------------------
If (k2 = 0) & (T_2 = 0 )){
T_2 = 1;
T_3 = 0;
Sbuf = 0x03;
While (Ti = 0 );
Ti = 0;
}
//-------------------------------------
If (k1 = 1) & (k2 = 1) & (T_3 = 0 )){
T_1 = 0;
T_2 = 0;
T_3 = 1;
Sbuf = 0x07;
While (Ti = 0 );
Ti = 0;
}}}
// ================================================ ============
The program running screen is displayed in the illustration.
Original question Web site: http://zhidao.baidu.com/question/198788419.html? Fr = im00008
The questioner's comment on the answer: Thank you for your help! |
