rtems/bsps/sparc/leon2/console/debugputs.c

/**
 * @file
 * @ingroup sparc_leon2
 * @brief TTY driver for the serial ports on the LEON
 */

/*
 *  This file contains the TTY driver for the serial ports on the LEON.
 *
 *  This driver uses the termios pseudo driver.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>

/*
 *  Method is shared with console.c
 */
void console_outbyte_polled( int port, unsigned char ch );
int console_inbyte_nonblocking( int port );

/*
 *  console_outbyte_polled
 *
 *  This routine transmits a character using polling.
 */

void console_outbyte_polled(
  int  port,
  unsigned char ch
)
{
  if ( port == 0 ) {
    while ( (LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_THE) == 0 );
    LEON_REG.UART_Channel_1 = (unsigned int) ch;
    return;
  }

  while ( (LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_THE) == 0 );
  LEON_REG.UART_Channel_2 = (unsigned int) ch;
}

/*
 *  console_inbyte_nonblocking
 *
 *  This routine polls for a character.
 */

int console_inbyte_nonblocking( int port )
{

  switch (port) {

    case 0:
      if (LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_ERR) {
        LEON_REG.UART_Status_1 = ~LEON_REG_UART_STATUS_ERR;
      }

      if ((LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_DR) == 0)
         return -1;
      return (int) LEON_REG.UART_Channel_1;
      return 1;

    case 1:
      if (LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_ERR) {
        LEON_REG.UART_Status_2 = ~LEON_REG_UART_STATUS_ERR;
      }

      if ((LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_DR) == 0)
         return -1;
      return (int) LEON_REG.UART_Channel_2;

    default:
      assert( 0 );
  }

  return -1;
}