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Guest
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| IR-Code simulation student needs help! |
 Posted: Sat Mar 17, 2007 11:24 am |
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Hello everybody,
my name is Bernhard, I am a student from Austria(next to Germany) and i am shortly before my school leaving examination.
My job is it to create an IR-Code.
I use the MPLAB 7.5 , CCS C and the PIC18F452.
I need your help!
Let me try to explain what my code is about:
I have an array codin[] which is a simplified version of the real code. I made a decode routine where the codin data is being converted. For example a "1" would be converted 1,0,0,0 . That means, when using timer0, 400us high followed by 1200us low time(see code). The new code is then send to the codout[] array, and there timer0 creates pulses.
The first three bits of codin[] are used to identify the IR-protocol.
Then the simplified code data comes.
The output data is based on the values in codout[].
So, now to my problem 
The simulation of codout[] doesnt match with the converted codin[] data.
I use the MPLAB(7.5) IDE Logic Analyzer.
The IR-Code begins with a specified start impuls length, like (1,1,1,1,1,0,0,0), that means 5*400us(timer0) + 3*400us.
That must accur everytime before I send the Code.
I thought it would be possible to fill the codout[] with the start value, and after that i start decoding, but it doesn't work. (please see code)
 I hope that my text can be understood 
It would be a huge oblige, when you could help me!!!
Thanks in advance!
best regards Bernhard
Here is my code:
| Code: |
#include<18F452.h>
#fuses XT,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#use standard_io(c)
int x=0, i=3, value;
int count=3;
int codin [] = {0,0,0,1,1,1,1,0,0,0}; // simplified for test
int codout[] = {}; // empty array
#int_timer0
void isr()
{
set_timer0(80); // timer overflow 400us
if(codout[count]==1) // value check in codout array
{
output_high(Pin_B5);
setup_ccp1(CCP_PWM);
}
else
{
output_low(Pin_B5);
setup_ccp1(CCP_OFF);
}
count++;
if(count>22) // the codout array consits of 22digits
count=3; //set to 3 because field number 0,1,2 are used for Identification
}
void yamaha() // yamaha code decoder
{
// here comes the start impuls 5*400us + 3*400us, doest work
//codout[x]=1;
//codout[x+1]=1;
// codout[x+2]=1;
//codout[x+3]=1;
// codout[x+4]=1;
//codout[x+5]=0;
//codout[x+6]=0;
// codout[x+7]=0;
//x=x+8;
for(i=0; i<8; i++)
{
if (codin[i]==0) // check input array for 0
{
codout[x]=1;
codout[x+1]=0;
x= x+2;
}
else if (codin[i]==1) // check input array for 1
{
codout[x]=1;
codout[x+1]=0;
codout[x+2]=0;
codout[x+3]=0;
x= x+4;
}
}
}
void sony() // It is not yet used!
{
for(i=0; i<11>17
value =13; // set 50% PWM duty cycle // for 38khz value-> 13 for 56khz value-> 9
set_pwm1_duty(value);
choose();
while(1) {
}
}
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bernhard3
Joined: 17 Mar 2007
Posts: 2
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| Posted: Sat Mar 17, 2007 11:35 am |
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 I think I made a mistake!
I did not log in, so I sent my message as a quest!
I cannot edit it anymore...
And a part of my code is not displayed correctly!
Sorry, for that, I try to complete my code
greetings Bernhard
| Code: |
void sony() // It is not yet used!
{
for(i=0; i<11; i++)
{
if (codin[i]==0)
{
codout[x]=0;
codout[x+1]=0;
x= x+2;
}
else if (codin[i]==1)
{
codout[x]=0;
codout[x+1]=0;
codout[x+2]=0;
codout[x+3]=0;
x= x+4;
}
}
}
void choose() // for IR-code identification
{int j;
if(codin[j]==0 && codin[j+1]==0 && codin[j+2]==0)
{
yamaha();
}
else if(codin[j]==1 && codin[j+1]==1 && codin[j+2]==1)
{
sony();
}
}
void main()
{
enable_interrupts(GLOBAL);
enable_interrupts(INT_TIMER0);
enable_interrupts(INT_TIMER1);
setup_timer_0 (RTCC_INTERNAL|RTCC_8_BIT);
setup_ccp1(CCP_PWM); // Configure CCP1 as a PWM
setup_timer_2(T2_DIV_BY_1, 17, 1); // (4MHz / (4 * TMR2 prescale value * 38KHz)) - 1 = 25 || for 56khz->17
value =13; // set 50% PWM duty cycle // for 38khz value-> 13 for 56khz value-> 9
set_pwm1_duty(value);
choose();
while(1) {
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Mar 17, 2007 11:43 am |
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| Quote: | int x=0, i=3, value;
int count=3;
int codin [] = {0,0,0,1,1,1,1,0,0,0}; // simplified for test
int codout[] = {}; // empty array |
The line in bold is wrong.
You must declare the array size, either by initializing it as you have
done with 'codin' or by putting a value inside the brackets.
Example:
Your current code is over-writing other variables. Look at the .SYM
file in your project directory:
| Code: |
01A value
01B count
01C-025 codin
026 codout
027 yamaha.@SCRATCH
028 yamaha.@SCRATCH
029 yamaha.@SCRATCH
02A isr.@SCRATCH
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Notice that 'codout' is only one byte long. If you write more than
one byte to it, you will destroy the yamaha scratch variables and
also the isr scratch variable. Your program will not run correctly.
That's why it's important to declare the size of the 'codout' array.
-------
Also, when you post code, make sure that you disable HTML.
Some of the lines in your code were garbled because HTML was enabled.
There is a tickbox below the posting window to disable it.
It looks like this:
| Quote: | | x Disable HTML in this post |
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bernhard3
Joined: 17 Mar 2007
Posts: 2
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| Posted: Sat Mar 17, 2007 11:59 am |
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@ PCM programmer
Thank's for your fast respond!
Is it correct that with [10] , ten fields, with a start value of 0, are created?
When i use "int" I have 256 digits?
Is 255 the maximum field number when using int?
greetings Bernhard |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Mar 17, 2007 12:15 pm |
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In CCS, 'int' mean an 8-bit unsigned integer.
If you use an 'int' as the array index, you can declare an array
of 256 elements. Example:
| Code: |
int array[256];
void main()
{
int i; // Array index
int c;
c = array[i];
while(1);
} |
The value of 'i' can be from 0 to 255. |
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buneri
Guest
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| Problem in Timer Isr |
| Posted: Sat Apr 07, 2007 1:52 am |
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I m using two timers timero and timer1 in my project. My project is to creat pulses of width 500us with respect to the percentage value of ADC. For example for 5V i need 200 pulses and for 2.5V i need 100 pulses and the hundred pulses with 0s width.
Also i need 500us width pulse in start and at the end of 100ms delay i.e at the end of 200 pulses but this output is on anther pin.
I have connected an LED to both of the output pin, I seen the mistake in timing.
Here is my code if anyone find mistake plz tell me,
// PIN_D0 500us pulse after every 100ms delay
// PIN_D1 500us pulses wrt the ADC value
#include <16F877.h>
#device icd=true
#device adc=10
#fuses HS,NOLVP,NOWDT
#use delay(clock=20000000)
#define boundry PIN_D7
#define pulse PIN_D0
int pulses=0,NOP;
#int_RTCC
RTCC_isr()
{
pulses++;
if((pulses < (NOP+1)) && (pulses > 1))
output_toggle(pulse);
if(pulses >= (NOP+1))
output_bit(pulse,0);
set_rtcc(255-39);
}
#int_TIMER1
TIMER1_isr()
{
pulses=0;
set_timer1(65535-6250);
}
void main()
{
float value;
setup_adc_ports( ALL_ANALOG );
setup_adc(ADC_CLOCK_INTERNAL );
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_64);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);
setup_timer_2(T2_DISABLED,0,1);
//enable_interrupts(INT_RTCC);
//disable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
set_rtcc(0);
output_bit(boundry,0);
output_bit(pulse,0);
set_adc_channel(1);
// TODO: USER CODE!!
while(1)
{
delay_us(10);
value=read_adc();
NOP = (value/1023)*2*100;
enable_interrupts(INT_RTCC);
//set_rtcc(0);
if(pulses==0)
output_bit(boundry,1);
if(pulses==1)
{
output_bit(boundry,0);
enable_interrupts(INT_TIMER1);
set_timer1(0);
}
}//while
}//main |
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