基于s3c2410开发板的UART测试程序

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);
}