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Manchester Decoding [RC5 Code for Philips Remote Controls]

 
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chriss2000
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Manchester Decoding [RC5 Code for Philips Remote Controls]
PostPosted: Fri Jan 17, 2003 12:05 pm     Reply with quote

#include <16f876.h>
#Device ICD=TRUE
#use delay(clock=4000000)
#bit T0IF=0xB.2
#bit INTF=0xB.1
#use rs232(BAUD=9600, xmit=pin_c6, rcv=pin_c7)
int newbit=0,flag=0,offset=1,i=0;
long count=0,code=0,abtast=75;

#int_ext //allow ext interrupt
isr() //Interrupt Service Routine
{
disable_interrupts(int_ext); //disable interrupt on Pin B0 [until the next signal
set_timer0(0); //Set Timer 0 to zero
flag=1; //Set Interruptflag to 1
}

void main()
{
set_tris_A(0xFF);
set_tris_B(0xFF);
set_tris_C(0x00);
setup_timer_0(RTCC_DIV_16|RTCC_Internal); //Timer 0 Setup, counts up with 62,5kHz
//Teilung: When the counter has the value 1, 16us have left

enable_interrupts(int_ext); //Allow ext Interrupt on Rb0
enable_interrupts(global); //Allow Global Interrupt
ext_int_edge(H_TO_L); //Wait for falling edge--> then jump to Interrupt Service Routine
while(1) //As long as True -->Make Main
{
while(flag=1)
{
if(i<14) //14 Bit Code-->scan 14 times
{
count=get_timer0(); //Get counter time
if(count>=abtast) //If counter time is greater than the value were i want to scan my signal-->scan the Pin A0
{
newbit=input(Pin_A0); //get the bit value of Pin A0
code=code|newbit;
code<<1; //Shift the input values in my integer
abtast=abtast+111; //count up my scan value

}
i++;
}

delay_ms(80); //80ms delay to wait for the beginning of the next signal
enable_interrupts(int_ext); //allow ext Interrupt on Pin B0
flag=0; //Set The Interrupt Flag to Zero to get out of the cycle
abtast=75; //The Timer Value 75 is the same as 1,2 ms and i need that time to scan my bit in the 3/4 bit size
i=0;
}
}
}
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Original Post ID: 10758
PCM programmer



Joined: 06 Sep 2003
Posts: 20381

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Re: Manchester Decoding [RC5 Code for Philips Remote Control
PostPosted: Fri Jan 17, 2003 12:27 pm     Reply with quote

:=while(flag=1)

:=code<<1;
--------------------------------------------------

Both of the lines above are incorrect.
You must learn to spot these kinds of errors.

I'm struggling with good way to say this:
Programming will not become easy until you
learn to avoid these kinds of errors.
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This message was ported from CCS's old forum
Original Post ID: 10760
Hans Wedemeyer
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Re: Manchester Decoding [RC5 Code for Philips Remote Control
PostPosted: Fri Jan 17, 2003 1:14 pm     Reply with quote

I second that.
He has bugged me at home, and I keep telling him about this line of code... I'm sure he just wants someone to write it all for him!

The line of code is commented with //disable interrupt on Pin B0 [until the next signal

Another interrupt is never going to happen !



#int_ext //allow ext interrupt
isr() //Interrupt Service Routine
{
disable_interrupts(int_ext); //disable interrupt on Pin B0 [until the next signal
set_timer0(0); //Set Timer 0 to zero
flag=1; //Set Interruptflag to 1
}
:=:=while(flag=1)
:=
:=:=code<<1;
:=--------------------------------------------------
:=
:=Both of the lines above are incorrect.
:=You must learn to spot these kinds of errors.
:=
:=I'm struggling with good way to say this:
:=Programming will not become easy until you
:=learn to avoid these kinds of errors.
___________________________
This message was ported from CCS's old forum
Original Post ID: 10761
R.J.Hamlett
Guest







Re: Manchester Decoding [RC5 Code for Philips Remote Control
PostPosted: Fri Jan 17, 2003 2:47 pm     Reply with quote

:=I second that.
:=He has bugged me at home, and I keep telling him about this line of code... I'm sure he just wants someone to write it all for him!
:=
:=The line of code is commented with //disable interrupt on Pin B0 [until the next signal
:=
:=Another interrupt is never going to happen !
:=
Yes. He has used some code I posted, and not added the stuff needed (and mentioned in the comments), to make it work. He needs to clear the interrupt flag, and re-enable the interrupts once the last bit of the current character is received.
Combined with the syntax errors it makes sure the code won't work...

Best Wishes


:=#int_ext //allow ext interrupt
:=isr() //Interrupt Service Routine
:={
:=disable_interrupts(int_ext); //disable interrupt on Pin B0 [until the next signal
:=set_timer0(0); //Set Timer 0 to zero
:=flag=1; //Set Interruptflag to 1
:=}
:=:=:=while(flag=1)
:=:=
:=:=:=code<<1;
:=:=--------------------------------------------------
:=:=
:=:=Both of the lines above are incorrect.
:=:=You must learn to spot these kinds of errors.
:=:=
:=:=I'm struggling with good way to say this:
:=:=Programming will not become easy until you
:=:=learn to avoid these kinds of errors.
___________________________
This message was ported from CCS's old forum
Original Post ID: 10762
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