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#include "board.h"

#include "uart.h"

#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)

#define WAIT_FOR_XMITR \

        do { \

                lsr = REG8(UART_BASE + UART_LSR); \

        } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)

#define WAIT_FOR_THRE \

        do { \

                lsr = REG8(UART_BASE + UART_LSR); \

        } while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)

#define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR)

#define WAIT_FOR_CHAR \

         do { \

                lsr = REG8(UART_BASE + UART_LSR); \

         } while ((lsr & UART_LSR_DR) != UART_LSR_DR)

#define UART_TX_BUFF_LEN 32

#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)

char tx_buff[UART_TX_BUFF_LEN];

volatile int tx_level, rx_level;

void uart_init(void)

{

        int devisor;

        /* Reset receiver and transmiter */

        REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14;

        /* Disable all interrupts */

        REG8(UART_BASE + UART_IER) = 0x00;

        /* Set 8 bit char, 1 stop bit, no parity */

        REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);

        /* Set baud rate */

        devisor = IN_CLK/(16 * UART_BAUD_RATE);

        REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB;

        REG8(UART_BASE + UART_DLL) = devisor & 0x000000ff;

        REG8(UART_BASE + UART_DLM) = (devisor >> 8) & 0x000000ff;

        REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB);

        return;

}

void uart_putc(char c)

{

        unsigned char lsr;

        WAIT_FOR_THRE;

        REG8(UART_BASE + UART_TX) = c;

        if(c == '\n') {

          WAIT_FOR_THRE;

          REG8(UART_BASE + UART_TX) = '\r';

        }

        WAIT_FOR_XMITR;

}

void uart_print_str(char *p)

{

        while(*p != 0) {

                uart_putc(*p);

                p++;

        }

}

void uart_print_long(unsigned long ul)

{

  int i;

  char c;

  uart_print_str("0x");

  for(i=0; i<8; i++) {

  c = (char) (ul>>((7-i)*4)) & 0xf;

  if(c >= 0x0 && c<=0x9)

    c += '0';

  else

    c += 'a' - 10;

  uart_putc(c);

  }

}

void uart_print_short(unsigned long ul)

{

  int i;

  char c;

  char flag=0;

  uart_print_str("0x");

  for(i=0; i<8; i++) {

  c = (char) (ul>>((7-i)*4)) & 0xf;

  if(c >= 0x0 && c<=0x9)

    c += '0';

  else

    c += 'a' - 10;

  if ((c != '0') || (i==7))

    flag=1;

  if(flag)

    uart_putc(c);

  }

}

char uart_getc()

{

        unsigned char lsr;

        char c;

        WAIT_FOR_CHAR;

        c = REG8(UART_BASE + UART_RX);

        return c;

}