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单片机C语言实例-240-与电脑串口通信
//打开串口调试程序,将波特率设置为2400,无奇偶校验
#include <REG52.H> /* special function register declarations */
/* for the intended 8051 derivative */
#include <stdio.h> /* prototype declarations for I/O functions */
#ifdef MONITOR51 /* Debugging with Monitor-51 needs */
char code reserve [3] _at_ 0x23; /* space for serial interrupt if */
#endif /* Stop Exection with Serial Intr. */
/* is enabled */
sbit KEY=P3^2;
void delay(unsigned int U)
{
while(--U);
}
/*------------------------------------------------
The main C function. Program execution starts
here after stack initialization.
------------------------------------------------*/
void main (void)
{
/*------------------------------------------------
Setup the serial port for 1200 baud at 11.0592MHz.
------------------------------------------------*/
#ifndef MONITOR51
SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */
TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */
TH1 = 0xf3; /* TH1: reload value for 2400 baud @ 12MHz */
TR1 = 1; /* TR1: timer 1 run */
TI = 1; /* TI: set TI to send first char of UART */
#endif
/*------------------------------------------------
Note that an embedded program never exits (because
there is no operating system to return to). It
must loop and execute forever.
------------------------------------------------*/
while (1)
{
if(!KEY)
{
delay(10000);
if(!KEY)
{
printf ("This programer test ok!\n");
printf ("12:25:26\n");
}
}
}
}
更多详情参考附件文档
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