arm uart

void uart_putchar(unsigned char k)
{
 while(!(UTRSTAT0&0x04))

　　;  
  UTXH0 = k;
}
unsigned char uart_getchar(void)
{
 unsigned char c;
 while(!(UTRSTAT0&1<<0))

　　;
  c = URXH0;
 return c;
}

真是 踏遍铁鞋无觅处， 害我1天在整啊