查看“使用C8051F的串口对MAX3232进行自发自收”的源代码


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　　 使用C8051F的串口对MAX3232进行自发自收。


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[[File:C8051F_3_9.jpg]]
串口芯片MAX3232控制电路原理图


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下面部分从TXT拷出，拷到网页，代码部分缺省了很多空格，比较凌乱，请谅解！
USART详细程序请查看<a class="Blue_2_12px_" href="https://{{SERVERNAME}}/article/C8051F-4-3-12.htm" style="color: rgb(7, 66, 184);" target="_blank">C8051F USART程序
。 

//目标系统: 基于C8051F单片机
//应用软件: Silicon IDE / Keil

/*01010101010101010101010101010101010101010101010101010101010101010101
----------------------------------------------------------------------
实验内容：
使用串口调试助手查看串口的收发状态是否正常。
----------------------------------------------------------------------
硬件连接：
 DVK501(MAX3232PrlPort)   F320 EX
                           VCC    ---------   VCC
                           GND   ---------   GND
                           R1O    ---------   P0.5  
                           T1I      ---------   P0.4 
----------------------------------------------------------------------
注意事项：
（1）若有加载库程序，请将光盘根目录下的“library”下的“C8051F”文件夹拷到D盘
（2）请详细阅读：光盘根目录下的“说明书首页.htm”里的相应产品说明
----------------------------------------------------------------------
10101010101010101010101010101010101010101010101010101010101010101010*/
#define _DVK501_F320_EX_
#include <c8051f320.h> 
#include <stdio.h>
#include <../../../../library/C8051F/ws_clock.h>
#include <../../../../library/C8051F/ws_usart_port.h>
void main (void) 
{
uchar inputcharacter;
PCA0MD &amp;= ~0x40; //clear watchdog timer 
XBR1 = 0x40; // Enable crossbar and weak pull-ups
clock_external(); 
usartInit();
while (1)
{
printf ("\nEnter character: ");
inputcharacter = getkey ();
printf ("\nCharacter entered : %c",inputcharacter);
printf ("\n Value in Hex: %bx",inputcharacter);
}
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打开串口调试助手，波特率调为9600，在PC机接收到“Enter character: "后，从键盘中随意输入一个字母、数字或符号，然后回车，查看串口调试助手上的现象。

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