/*-------------------------------------------------------------------
**
**  Soluciones del examen de Programación de Sistemas y Dispositivos
**  Curso 2016-17, Convocatoria de Febrero, 3 de febrero de 2017
**
**-----------------------------------------------------------------*/

/*-------------------------------------------------------------------
**    Ejercicio 1
**-----------------------------------------------------------------*/

#include <s3c44b0x.h>
#include <common_types.h>
#include <system.h>
#include <uart.h>
#include <timers.h>
#include <keypad.h>

void timer0_isr( void ) __attribute__ ((interrupt ("IRQ")));

volatile boolean flag;
volatile uint8 scanCode;

void main( void )
{  
    sys_init();
    uart0_init();
    timers_init();
    keypad_init();

    flag = FALSE;
    timer0_open_ms( timer0_isr, 20, TIMER_INTERVAL );

    while( 1 )
        if( flag )
        {
            uart0_puts( "\nScancode: 0x" );
            uart0_puthex( scanCode );
            flag = FALSE;
        }
}

void timer0_isr( void )
{
    static uint8 lastScanCode = 255;

    scanCode = keypad_scan();
    if( scanCode != lastScanCode && scanCode != KEYPAD_FAILURE )
    {
        lastScanCode = scanCode;
        flag = TRUE;
    }

    I_ISPC = BIT_TIMER0;
}

/*-------------------------------------------------------------------
**    Ejercicio 2
**-----------------------------------------------------------------*/

#include <common_types.h>
#include <fix_types.h>

fix16 fix_convert( fix16 number, uint8 n, uint8 m )
{
    fix32 aux;

    if( n >= m )
        return number >> (n-m);
    else {
        aux = number << (m-n);
        if( aux > MAX_INT16 )
            return MAX_INT16;
        else if ( aux < MIN_INT16 )
            return MIN_INT16;
    }
}

/*-------------------------------------------------------------------
**    Ejercicio 3
**-----------------------------------------------------------------*/

#include <common_types.h>
#include <lcd.h>

extern uint8 font[];

void lcd_putchar_xsize( uint16 x, uint16 y, uint8 color, char ch, uint8 size )
{
    uint8 row, col;
    uint8 *bitmap;
      
    bitmap = font + ch*16;
    for( row=0; row<16*size; row++)
        for( col=0; col<8*size; col++)                    
            if( bitmap[row/size] & (0x80 >> col/size) )
                lcd_putpixel( x+col, y+row, color );
            else
                lcd_putpixel( x+col, y+row, WHITE );
}

/*-------------------------------------------------------------------
**    Ejercicio 4
**-----------------------------------------------------------------*/

#include <s3c44b0x.h>
#include <common_types.h>

void set_mclk( uint8 numMHz )
{
    if( numMHz >= 20 && numMHz <= 66 )
        PLLCON = ((numMHz-8) << 12) | (2 << 4) | (1);
}