基于s3c2410开发板的uart测试程序-u球体育app下载

如下程序实现的是开发板从pc端口接受一个字符，并把该字符加1后发送会pc端口。（在本开发板测试成功）对于不同的主频要设置好ubrdiv0的值，在技术文档中有这个值的计算公式。

#define ulcon0     (*(volatile unsigned *)0x50000000) //uart 0 line control
#define ucon0      (*(volatile unsigned *)0x50000004) //uart 0 control
#define ufcon0     (*(volatile unsigned *)0x50000008) //uart 0 fifo control
#define umcon0     (*(volatile unsigned *)0x5000000c) //uart 0 modem control
#define utrstat0   (*(volatile unsigned *)0x50000010) //uart 0 tx/rx status
#define ubrdiv0    (*(volatile unsigned *)0x50000028) //uart 0 baud rate divisor

#define utxh0 (*(volatile unsigned char *)0x50000020) //uart 0 transmission hold
#define urxh0 (*(volatile unsigned char *)0x50000024) //uart 0 receive buffer

#define gphcon (*(volatile unsigned *)0x56000070)
#define gphdat (*(volatile unsigned *)0x56000074)
#define gphup  (*(volatile unsigned *)0x56000078)

int main()
{
 unsigned long txh0ready = 0x2;
 unsigned long rxh0ready = 0x1;
 //init uart
 gphcon |= 0xa0;
 gphup  |= 0x0c;  //pullup is enable;
 //init uart controllor
 ulcon0 = 0x03;
 ucon0  = 0x245;
 ufcon0 = 0x00;
 umcon0 = 0x00;
 ubrdiv0= 26;
  
 while(1)
 {
  while(!(utrstat0 & rxh0ready));
  c = urxh0;

  while(!(utrstat0 & txh0ready));//wait
  utxh0 = c 1;
 }
 while(1);
 return(0);
}