#include "uart.h"

 #define GPACON        (*((volatile unsigned long *)0x7f008000))

 #define ULCON0        (*((volatile unsigned long *)0x7f005000))

 #define UCON0        (*((volatile unsigned long *)0x7f005004))

 #define UFCON0        (*((volatile unsigned long *)0x7f005008))

 #define UMCON0        (*((volatile unsigned long *)0x7f00500c))

 #define UTRSTAT0    (*((volatile unsigned long *)0x7f005010))

 #define UERSTAT0    (*((volatile unsigned long *)0x7f005014))

 #define UFSTAT0        (*((volatile unsigned long *)0x7f005018))

 #define UMSTAT0        (*((volatile unsigned long *)0x7f00501c))

 #define UTXH0        (*((volatile unsigned long *)0x7f005020))

 #define URXH0        (*((volatile unsigned long *)0x7f005024))

 #define UBRDIV0        (*((volatile unsigned long *)0x7f005028))

 #define UDIVSLOT0    (*((volatile unsigned long *)0x7f00502c))

 #define UINTP0        (*((volatile unsigned long *)0x7f005030))

 #define UINTSP0        (*((volatile unsigned long *)0x7f005034))

 #define UINTM0        (*((volatile unsigned long *)0x7f005038))

 void uart0_init(void)

 {

     GPACON &= ~0xff;

     GPACON |= 0X22;

     ULCON0 = 0x03; //data frame: 8n1

     /*

     clk: pclk

     tx int type: level

     rx int type: pulse

     rx err int enable

     tx/rx mode: interrupt or polling

     */

     UCON0 = 0x245;

     UFCON0 = 0x00; //disable fifo;

     UMCON0 = 0X00; //disable auto flow control(AFC)

     /*

     DIV_VAL = UBRDIV + (num of 1's in UDIVSLOT)/16

     DIV_VAL = (PCLK/(bps*16))-1 = (66000000/115200)-1=34.8

     UBRDIV = 34;

     num of 1's in UDIVSLOT = 13;

     */

     UBRDIV0 = 0x22;

     UDIVSLOT0 = 0x1fff;

 }

 int uart0_getc(void)

 {

     while (!(UTRSTAT0 & 0x1));

     return (URXH0 & 0xff);

 }

 void uart0_putc(const char c)

 {

     while (!(UTRSTAT0 & 0x2));

     UTXH0 = c;

     if (c == '\n')

     {

         uart0_putc('\r');

     }

 }

 void uart0_puts(const char *s)

 {

     while (*s)

     {

         uart0_putc(*s++);

     }

 }