Hello everyone!
I am doing Digital Compass Navigation Aids. It consists of the 1490 Digital Compass, a P18F4620 Microcontroller, ISD2560 voice record/playback chip LM4808M amplifier, 5volts and 3.3volts voltage regulators and three switches, the recording switch, the playback switch. First, i should record north, south, east and west into the chip by pressing SW3. Then by pressing SW4, it should playback my voice.

My objectives are to create a portable device that can be used by the blind to keep track of their direction of travels. Eg. When the blind man is facing north, the device should playback "north".

Using MPLAB IDE v7.40 - C Language.

My problem:
When the record button is pressed, voice is not recorded in the chip. The code for the playback button is also not working.

Here is my code:

#include <p18f4620.h> //for special function register declarations
#include <portb.h>   //for the RB0/INT0 interrupt
//#include<adc.h>
//#include<stdlib.h>
#include <delays.h>
#define PR PORTCbits.RC2   //name PORTCbits.RC2 as PR
#define PD PORTDbits.RD7  //name PORTDbits.RD7 as PD
#define CE_ PORTDbits.RD6  //name PORTDbits.RD6 as CE_
#define EOM_ PORTCbits.RC3      //#define EOM_ PORTCbits.RC3

void Init(void)     //re-initialize the PORTs 
{
 PD=1;
 CE_=1;
 PR=1;
 PORTCbits.RC4 = 0;
 PORTBbits.RB5 = 0;
 PORTBbits.RB4 = 0;
 PORTBbits.RB3 = 0;
 PORTAbits.RA5 = 0;
 PORTAbits.RA4 = 1;
 PORTEbits.RE2 = 0;
 PORTEbits.RE1 = 0;
 PORTEbits.RE0 = 0;
}
void Mode(void)
{
  CE_=0; //to start record/playback
 Delay10KTCYx (25);
 CE_=1; //take CE back to high to stop record/playback
}
void AddressNorth (void)   //address code for North
{
 PORTCbits.RC4 = 0;
 PORTBbits.RB5 = 0;
 PORTBbits.RB4 = 0;
 PORTBbits.RB3 = 1;
 PORTAbits.RA5 = 1;
 PORTAbits.RA4 = 0;
 PORTEbits.RE2 = 0;
 PORTEbits.RE1 = 1;
 PORTEbits.RE0 = 0;
}
void AddressEast (void)   //address code for East
{
 PORTCbits.RC4 = 0;
 PORTBbits.RB5 = 0;
 PORTBbits.RB4 = 1;
 PORTBbits.RB3 = 1;
 PORTAbits.RA5 = 0;
 PORTAbits.RA4 = 0;
 PORTEbits.RE2 = 1;
 PORTEbits.RE1 = 0;
 PORTEbits.RE0 = 0;
}
void AddressSouth (void)  //address code for South
{
 PORTCbits.RC4 = 0;
 PORTBbits.RB5 = 1;
 PORTBbits.RB4 = 0;
 PORTBbits.RB3 = 0;
 PORTAbits.RA5 = 1;
 PORTAbits.RA4 = 0;
 PORTEbits.RE2 = 1;
 PORTEbits.RE1 = 1;
 PORTEbits.RE0 = 0;
}
void AddressWest (void)   //address code for West
{
 PORTCbits.RC4 = 0;
 PORTBbits.RB5 = 1;
 PORTBbits.RB4 = 1;
 PORTBbits.RB3 = 0;
 PORTAbits.RA5 = 0;
 PORTAbits.RA4 = 1;
 PORTEbits.RE2 = 0;
 PORTEbits.RE1 = 0;
 PORTEbits.RE0 = 0;
}
 
void Record (void);
void Playback (void);
#pragma code HIGH_INTERRUPT_VECTOR = 0x8 
void high_ISR(void)
{
 if(INTCONbits.INT0IF)  //to set the interrupt routines
 {
 _asm
   goto Record
 _endasm 
 }
 if(INTCON3bits.INT1IF)  //to set the interrupt routines
 {
 _asm
  goto Playback
 _endasm
 }
}
#pragma code //allow the linker to locate the remaining code
#pragma interrupt Record
void Record(void)
{
 PD=0;     //take PD to low state 
 Delay10KTCYx(30);
 PR=0;     //take PR to low state
   
// Delay10KTCYx (25);
 if(PORTA ==0x16)    //to set the address memory
 {
  AddressNorth();
 }
 if(PORTA ==0x1C)    //to set the address memory
 {
  AddressEast();
 }
 if(PORTA ==0x19)    //to set the address memory
 {
  AddressSouth();
 }
 if(PORTA ==0x13)    //to set the address memory
 {
  AddressWest();
 }
 PR=0;       //take PR pin to low
 CE_=0;  //take CE_ pin to low
 Mode();  //to define the mode
 EOM_=1;  //to define the mode
 Delay10KTCYx (13);
 while(!PORTBbits.RB0)
 {
  INTCONbits.INT0IF=0; //clear flag to avoid another interrupt
  Init();     // call Init routine (to initialize)
 } 
}
#pragma interrupt Playback
void Playback(void)
{
 PD=0;       //take PD to low state
 PR=1;       //take PR to high state
 if(PORTA ==0x16)                //to set the address memory
 {
  AddressNorth();
 }
 if(PORTA ==0x1C)    //to set the address memory
 {
  AddressEast();
 }
 if(PORTA ==0x19)    //to set the address memory
 {
  AddressSouth();
 }
 if(PORTA ==0x13)    //to set the address memory
 {
  AddressWest();
 }
// PD=0;  //set PD to low
// PR=1;  //take PR to high
// Delay10KTCYx (300);
 CE_=1; 
// CE_=0;
// Delay10KTCYx (30);
// CE_=1;
 Mode();     //to define the mode
 
 while(!PORTBbits.RB1)           
 {
  INTCON3bits.INT1IF=0; //clear flag to avoid another interrupt
  Init(); //call Init routine (to initialize)
 }
}

void EnableHighInterrupts(void)
{
 RCONbits.IPEN =1; //enable interrupt priority levels
 INTCONbits.GIEH=1; //enable all high priority interrupts
    //INTCON3bits.INT2IP=1;
}
void WaitForButton(void)
 {
  INTCONbits.RBIF=0; //set INTCONbits.RBIF back to low
  Init(); //call Init routine (to initialize)      
        while(1); //wait for the SW3 button to be pressed
 }  

void main(void)
{
 /*Initializing PORTA*/
 LATA = 0x00;   //Initialize PortA by clearing output data latches
  PORTA = 0x00;
 ADCON1 = 0x0F;   //Configure A/D for digital inputs 
 TRISA = 0x0F;    //RA<3:0> as inputs, RA<4:5> as outputs
     //RA<6:7> as "0" when not used as port pins    
 CMCON = 0x07;   //Configure comparators for digital inputs
 /*Initializing PORTB*/    
 LATB = 0x00;   //Initialize PortB by clearing output data latches
 TRISB = 0xC7;    //RB<2:0> & RB<7:6> as input, RB<5:3> as outputs
       
 
 /*Initializing PORTC*/
 LATC = 0x00;   //Initialize PortC by clearing output data latches
 TRISC = 0x20;    //RC5 as inputs, RC<7:6> & RC<4:0> as outputs
 
 /*Initializing PORTD*/
 //PORTD = 0x00;
 LATD = 0x00;   //Initialize PortD by clearing output data latches
 TRISD = 0x00;    //RD<7:0> as outputs
  
 
 /*Initializing PORTE*/
 LATE = 0x00;   //Initialize PortE by clearing output data latches
 TRISE = 0x00;    //RE<7:0> as outputs */
 
 EnableHighInterrupts();
 OpenRB0INT(PORTB_CHANGE_INT_ON & //enable the RB0/INT0 interrupt
      PORTB_PULLUPS_ON & //configure the RB0 pin for input
      FALLING_EDGE_INT); //trigger interrupt upon SW3 button 
          //depression
 OpenRB1INT(PORTB_CHANGE_INT_ON & //enable the RB1/INT0 interrupt
      PORTB_PULLUPS_ON & //configure the RB1 pin for input
      FALLING_EDGE_INT); //trigger interrupt upon SW3 button depression            
                                                                               
 
 WaitForButton();
 
}

Sorry for my untidiness
Please correct my source code.
Million Thanks

>>Please correct my source code.
Impossible for us because we don't have the hardware and there is nothing in the code you posted that indicates any obvious coding flaws. You need to learn to use a debugger and step through the code so that you can see what it is or is not doing. If that isn't possible then ????? (I have no clue)

Maybe I should narrow down my problem. I am having problem with recording and playback. Anyone here knows any interrupt routine in C code for ISD2560 (voicerecord/playback chip)?

Your help will be very much appreciated.
Thanks

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