Subversion Repositories altor32

#include "mem_map.h"

#include "serial.h"

//-----------------------------------------------------------------

// Defines

//-----------------------------------------------------------------

#define UART_RX_AVAIL    (1<<0)

#define UART_TX_BUSY     (1<<3)

//-------------------------------------------------------------

// serial_init: 

//-------------------------------------------------------------

void serial_init (void)

{

    // Not required

}

//-------------------------------------------------------------

// serial_putchar: Write character to UART Tx buffer

//-------------------------------------------------------------

int serial_putchar(char ch)

{

    if (ch == '\n')

        serial_putchar('\r');

    // Print in simulator via l.nop instruction

    {

        register char  t1 asm ("r3") = ch;

        asm volatile ("\tl.nop\t%0" : : "K" (0x0004), "r" (t1));

    }

    // Write to Tx buffer

    UART_UDR = ch;

    // Wait for Tx to complete

    while (UART_USR & UART_TX_BUSY);

    return 0;

}

//-------------------------------------------------------------

// serial_getchar: Read character from UART Rx buffer

//-------------------------------------------------------------

int serial_getchar (void)

{

    if (serial_haschar())

        return UART_UDR;

    else

        return -1;

}

//-------------------------------------------------------------

// serial_haschar: Is a character waiting in Rx buffer

//-------------------------------------------------------------

int serial_haschar()

{

    return (UART_USR & UART_RX_AVAIL);

}

//-------------------------------------------------------------

// serial_putstr: Send a string to UART

//-------------------------------------------------------------

void serial_putstr(char *str)

{

    while (*str)

        serial_putchar(*str++);

}