/****************************************************************************
*
*   Copyright (c) 2005 Dave Hylands
*
*   This program is free software; you can redistribute it and/or modify
*   it under the terms of the GNU General Public License as published by
*   the Free Software Foundation; either version 2 of the License, or
*   (at your option) any later version.
*
*   This program is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*   GNU General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with this program; if not, write to the Free Software
*   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*
****************************************************************************/

/* Flash-LED.c modified by Dima Diall to read ADC on-demand */

#include <avr/io.h>
#include <stdio.h>

#include "a2d.h"
#include "Hardware.h"
#include "UART.h"

int main(void)
{
    FILE   *u0;

    InitHardware();

    // The first handle opened for read goes to stdin, and the first handle
    // opened for write goes to stdout. So u0 is stdin, stdout, and stderr

#if defined( __AVR_LIBC_VERSION__ )
    u0 = fdevopen( UART0_PutCharStdio, UART0_GetCharStdio );
#else
    u0 = fdevopen( UART0_PutCharStdio, UART0_GetCharStdio, 0 );
#endif

    printf( "*****\n" );
    printf( "***** Read-LED program\n" );
    printf( "*****\n" );
    
    while( 1 )
    {
        // Poll UART for incoming characters
        if ( UART0_IsCharAvailable() )
        {
            // Get ADC channel number as ASCII character 
            char ch = getchar() - '0';
            
            // Turn all of the LEDs off
            LED_OFF( RED );
            LED_OFF( BLUE );
            LED_OFF( YELLOW );
            
            // Verify if ADC channel is in range (0..7)
            if ( ch >= 0 && ch <= 7 )
            {
                // Read requested ADC channel and print result (in hex)
                LED_ON( BLUE );
                printf( "0x%04x\n", a2d_10( ch ));
            }
            else
            {
                // Channel out of range: error!
                LED_ON( RED );
                printf( "???\n" );
            }
        }
        
        // Do other work, introduce some delay, go to sleep (...)
    }

    return 0;
}