/* 文件 serl.c*/
   #include "ser.h"
   
   void myinit_uart() {
     GPHCON |= 0xa0; /* GPH2, GPH3 used as RXD0, TXD0*/
     GPHUP = 0x0c;   /* GPH2, GPH3 poll-up */
   
     ULCON0 = 0x03;  /* normal mode, no parity, one stop bit, 8-bit*/
     UCON0 = 0x05;   /* Loopback mode*/
     UFCON0 = 0x00;  /* not use FIFO*/
     UMCON0 = 0x00;  /* disable flow control*/
     UBRDIV0 = 12;   /* baud rate 57600*/
   }
   
   void myputc(unsigned char ch) {
     while (!(UTRSTAT0 & TXD0_READY));
     UTXH0 = ch;
   }
   
   unsigned char mygetc(){
     while (! (UTRSTAT0 & RXD0_READY));
     return URXH0;
   }