Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] NEC protocol generation using ATMEGA 8

Status
Not open for further replies.
D

djc

Advanced Member level 1
Joined
Jan 27, 2013
Messages
402
Helped
3
Reputation
6
Reaction score
2
Trophy points
1,298
Location
India
Activity points
4,554
Can anybody guide me on how to generate NEC protocol for a Mp3 modue to play mp3 files using ATMEGA8 and codevision avr.
 

Here is my code for NEC protocol generation. I have used timer 1 with clock source of 8Mhz, with prescale of 8, with 1us time cycle duration.So i loaded timer with different values each time for calling interrupt. I am using a software called IR protocol analyzer to test the signals from microcontroller. Though It is showing right time duration for all the data it is not accepting it. I send address 32640, command 18 and its inverse 237, still no result.
Code: 
/*****************************************************
This program was produced by the
CodeWizardAVR V2.03.4 Standard
Automatic Program Generator
© Copyright 1998-2008 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project : 
Version : 
Date    : 4/2/2014
Author  : 
Company : 
Comments: 


Chip type           : ATmega8
Program type        : Application
Clock frequency     : 8.000000 MHz
Memory model        : Small
External RAM size   : 0
Data Stack size     : 256
*****************************************************/

#include <mega8.h>
#include <delay.h>

bit i=0;
int j=0;
//unsigned char mp3_addr[15]={1,1,1,1,1,1,1,1,0,0,0,0,0,0,0};
unsigned char mp3_addr[15]={0,0,0,0,0,0,0,1,1,1,1,1,1,1,1};
//unsigned char mp3_cmd[8]={0,0,0,1,0,0,1,0};      //18
unsigned char mp3_cmd[8]={0,1,0,0,1,0,0,0};
//unsigned char mp3_cmd_inv[8]={1,1,1,0,1,1,0,1};  //237
unsigned char mp3_cmd_inv[8]={1,0,1,1,0,1,1,1};

// Timer 1 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
// Reinitialize Timer 1 value
TCNT1H=0xDC;
TCNT1L=0xD8;
// Place your code here
    i=1;

}

// Declare your global variables here

void main(void)
{
// Declare your local variables here

// Input/Output Ports initialization
// Port B initialization
// Func7=In Func6=In Func5=In Func4=Out Func3=Out Func2=Out Func1=In Func0=Out 
// State7=T State6=T State5=T State4=0 State3=0 State2=0 State1=T State0=0 
PORTB=0x00;
DDRB=0x1D;

// Port C initialization
// Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=0x00;
TCNT0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 1000.000 kHz
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: On
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x02;
TCNT1H=0xdc;
TCNT1L=0xd8;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x04;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// Global enable interrupts
//#asm("sei")
delay_ms(100);
//while (1)
//      {
      //i=0;
      TCNT1H=0xdc; //dc
      TCNT1L=0xd8; //d8
      #asm("sei")
      while(i==0){
      PORTB.0=1;
      }
      #asm("cli")
      i=0;
      PORTB.0=0;
      TCNT1H=0xee;
      TCNT1L=0x76;
      #asm("sei")
      while(i==0){
      PORTB.0=1;
      }
      #asm("cli")      
      i=0;
            for(j=0;j<15;j++){
//            if(mp3_addr[j]==0){
//                PORTB.0=1;
//                TCNT1H=0xfd;
//                TCNT1H=0xe2;
//                #asm("sei")
//                while(i==0){
//                    PORTB.0=1;
//                }
//                #asm("cli")
//                i=0;     
//             }
//            if(mp3_addr[j]==1){
                
                TCNT1H=0xfd;
                TCNT1L=0xce;
                #asm("sei")
                while(i==0){
                    PORTB.0=1;
                }
                #asm("cli")
                i=0; 
            // }               
                    if(mp3_addr[j]==0){
                    TCNT1H=0xfd;
                    TCNT1L=0xce;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
                    if(mp3_addr[j]==1){
                    TCNT1H=0xf9;
                    TCNT1L=0x75;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
                                 
            }
            
      
            for(j=0;j<8;j++){
//            if(mp3_cmd[j]==0){
//                
//                TCNT1H=0xfd;
//                TCNT1H=0xe2;
//                #asm("sei")
//                while(i==0){
//                    PORTB.0=1;
//                }
//                #asm("cli")
//                i=0;     
//             }
//             if(mp3_cmd[j]==1){
                
                TCNT1H=0xfd;
                TCNT1L=0xce;
                #asm("sei")
                while(i==0){
                    PORTB.0=1;
                }
                #asm("cli")
                i=0; 
           //  }               
                    if(mp3_cmd[j]==0){
                    TCNT1H=0xfd;
                    TCNT1L=0xce;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
                    if(mp3_cmd[j]==1){
                    TCNT1H=0xf9;
                    TCNT1L=0x75;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
                    //#asm("cli")
      
            }
            
            for(j=0;j<8;j++){
//             if(mp3_cmd_inv[j]==0){
//                PORTB.0=1;
//                TCNT1H=0xfd;
//                TCNT1H=0xe2;
//                #asm("sei")
//                while(i==0){
//                    PORTB.0=1;
//                }
//                #asm("cli")
//                i=0;     
//             }
//             if(mp3_cmd_inv[j]==1){
                //PORTB.0=1;   
                TCNT1H=0xfd;
                TCNT1L=0xce;
                #asm("sei")
                while(i==0){
                    PORTB.0=1;
                }
                #asm("cli")
                i=0;
            // }                
                    if(mp3_cmd_inv[j]==0){
                    TCNT1H=0xfd;
                    TCNT1L=0xce;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
                    if(mp3_cmd_inv[j]==1){
                    TCNT1H=0xf9;
                    TCNT1L=0x75;
                    #asm("sei")
                    while(i==0){
                        PORTB.0=0;
                    }
                    #asm("cli")
                    i=0;
                    }
                    
//                    #asm("cli")
            }
                       
           
//      };
}

What must be the issue?
 

What is meant by that? address is correct, no issues with that. What else do i have to look for?
here are the screen shots
nec_1.pngnec_2.png
 
Last edited:

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top