/*-------------------------------------------------------------------
**
**  Soluciones del examen de Programación de Sistemas y Dispositivos
**  Curso 2023-24, Primera Convocatoria, 15 de enero de 2024
**
**-----------------------------------------------------------------*/

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


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


#define FS (16000)

void isr_timer0( void ) __attribute__ ((interrupt ("IRQ")));

uint32 numSamples;

void iis_buzz_ms( uint16 ms )
{
	numSamples = ms*FS/1000;
    timer0_open_tick( isr_timer0, FS );
}

void isr_timer0( void )
{
    static int16 sample    = MAX_INT16;
    static int16 sampleCnt = FS / (2*800);

    if( numSamples-- ) {
		if( !sampleCnt-- ) {
			sampleCnt = FS / (2*800);
			sample  = -sample;
		}
		iis_putSample( sample, sample );
    }
    else
    	timer0_close();
    I_ISPC = BIT_TIMER0;
}


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

#include <s3c44b0x.h>
#include <common_types.h>
#include <system.h>
#include <leds.h>
#include <timers.h>
#include <uda1341ts.h>

#define  DOT   (60)
#define  DASH  (3*DOT)

void send_s( void )
{
    led_on( LEFT_LED );
    iis_buzz_ms( DOT );
    sw_delay_ms( DOT );
    led_off( LEFT_LED );

    sw_delay_ms( DOT );

    led_on( LEFT_LED );
    iis_buzz_ms( DOT );
    sw_delay_ms( DOT );
    led_off( LEFT_LED );

    sw_delay_ms( DOT );

    led_on( LEFT_LED );
    iis_buzz_ms( DOT );
    sw_delay_ms( DOT );
    led_off( LEFT_LED );
}

void send_o( void )
{
    led_on( LEFT_LED );
    iis_buzz_ms( DASH );
    sw_delay_ms( DASH );
    led_off( LEFT_LED );

    sw_delay_ms( DOT );

    led_on( LEFT_LED );
    iis_buzz_ms( DASH );
    sw_delay_ms( DASH );
    led_off( LEFT_LED );

    sw_delay_ms( DOT );

    led_on( LEFT_LED );
    iis_buzz_ms( DASH );
    sw_delay_ms( DASH );
    led_off( LEFT_LED );
}

void send_sos( void )
{
    send_s();
    sw_delay_ms( 3*DOT );
    send_o();
    sw_delay_ms( 3*DOT );
    send_s();
    sw_delay_ms( 9*DOT );
}

void main( void )
{
    sys_init();
    timers_init();
    leds_init();
    uda1341ts_init();
    iis_init( IIS_POLLING );

    while( 1 )
    	send_sos();
}