eint.c

i2s usb audio demo lpc2138

/******************************************************************************
 *   Eint.c:  Philips LPC23xx Family Microprocessors
 *   file is for Button Interrupt handler for DSS demo
 *   
 *
 *   Copyright(C) 2007, Philips Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2007.05.01  ver 1.00    Prelimnary version, first Release
 *
 ******************************************************************************/
#include <stdio.h>											   
#include "lpc23xx.h"
#include "type.h"
#include "irq.h"

#define SONG song_joy

int I2S_muteFlag; /* only count L3_ticks when audio on -> muteFlag=1*/
extern unsigned int freq;
extern unsigned int accum;
unsigned int songindex;

unsigned long piano_Keys[] =   
{
  27,   29,   31,   33,   34,   37,   39,   41,   44,   46,   48,   52, 0,0,0,0,
  55,   58,   62,   65,   69,   73,   78,   82,   87,   92,   97,  104, 0,0,0,0, 
 110,  117,  123,  131,  139,  146,  156,  165,  174,  185,  195,  208, 0,0,0,0, 
 220,  233,  247,  262,  277,  293,  311,  330,  349,  370,  392,  415, 0,0,0,0, 
 440,  466,  494,  523,  554,  587,  622,  659,  698,  740,  784,  831, 0,0,0,0, 
 880,  932,  988, 1046, 1109, 1175, 1244, 1318, 1397, 1480, 1568, 1661, 0,0,0,0, 
1760, 1865, 1976, 2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 0,0,0,0, 
3520, 3729, 3951, 4186
};

unsigned char song_lamb[] = 
{
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x40,0x40,0x40,0x42,0x45,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x42,0x40,0x40,0x42,0x40,0x3a,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x40,0x40,0x40,0x42,0x45,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x42,0x40,0x40,0x42,0x40,0x3a,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x40,0x40,0x40,0x42,0x45,0x45,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x42,0x40,0x40,0x42,0x40,0x3a,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x40,0x40,0x40,0x42,0x45,0x45,0x45,
0x42,0x40,0x3a,0x40,0x42,0x42,0x42,0x42,0x40,0x40,0x42,0x40,0x3a,0x4f
};

unsigned char song_joy[] = 
{
0x37,0x37,0x38,0x3a,0x3a,0x38,0x37,0x35,0x33,0x33,0x35,0x37,0x37,0x35,0x35,
0x37,0x37,0x38,0x3a,0x3a,0x38,0x37,0x35,0x33,0x33,0x35,0x37,0x35,0x33,0x33,
0x35,0x35,0x37,0x33,0x35,0x37,0x38,0x37,0x33,0x35,0x37,0x38,0x37,0x35,0x33,0x35,0x2a,0x37,
0x37,0x38,0x3a,0x3a,0x38,0x37,0x35,0x33,0x33,0x35,0x37,0x35,0x33,0x33,0x3f
};

unsigned char song_40[] = 
{

0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40
};

/*******************************************************************************
* Function: key_Handler 
            This function will play the next note in current SONG array
			called from the keyboard scan routine    
*******************************************************************************/
void  key_HandlerDSS(void)
{
	 freq = piano_Keys[SONG[songindex]];
	 songindex++;
	 if (songindex > sizeof(SONG)-1 ) songindex = 0;	/* restart song at end */
	 
	 I2S_muteFlag = 0;
     FIO2SET = 0x1;	/* turn on led 0 */
}

/*******************************************************************************
* Function: IRQ_EINT0_Handler 
            This handler will start he next note in current SONG  array  
*******************************************************************************/
void  IRQ_EINT0_HandlerDSS(void) __irq
{
	 freq = piano_Keys[SONG[songindex]];
	 songindex++;
	 if (songindex >= sizeof(SONG)-1 ) songindex = 0;	/* restart song at end */

	 accum=0;
	 I2S_muteFlag = 0;	/* begin note sequence */
     FIO2SET = 0x1;		/* turn on led 0 */

     EXTINT = 0x01 << 0 ; /* clear interrupt */
     VICVectAddr = 0;	/* Acknowledge VIC Interrupt */
}

/*******************************************************************************
* Function: init_EINT    init External interrupt
        inputs:			 number is interrupt 0-3
		                 mode is level and edge sensitivity
						 polarity is trigger condition
		  
*******************************************************************************/
void init_EINT(unsigned long number, unsigned long mode, unsigned long polarity)
{
   disable_VIC_irq(14 + number);

   number &= 0x03; /* limit to four Eints */
   /* Pin Select */

   PINSEL4 = 0x01 << (20 + (number << 1) );
   EXTMODE  = mode << number;  /* 0 =  Level; 1 = edge sensitive */
   EXTPOLAR = polarity << number; /*trigger:  0 = falling edge/low; 1 = rising edge/ high */

   EXTINT = 0x01 << number; /* clear interrupt */
 }


/*******************************************************************************/

void check_freq(float samplingfreq)	/* test for periodicy in piano freq */
{
 	 int i;
	 float test;
	 for (i=0; i< 117; i++)
	 {
	 test = piano_Keys[i];
	 printf("%11.6f ,", samplingfreq/test);
	 if (i%16 == 15) printf("\r\n");
	 }
}