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tomi7
Joined: 15 Sep 2004
Posts: 5
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| Problem with RC5 code |
 Posted: Wed Jan 05, 2005 1:21 pm |
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I have wrote program for pic12f675 to decode rc5 code.
It works, but decoding rc5 is not correct.
What is wrong ? Can You help me ?
| Code: |
#include <12F675.h>
#device adc=8
#use delay(clock=3579545)
#fuses NOWDT,XT, NOCPD, NOPROTECT, NOMCLR, PUT, BROWNOUT
#use rs232(baud=9600,parity=N,xmit=PIN_A0,rcv=PIN_A1,bits=8)
#define IR_SENSOR PIN_A2
#define IR (!input(IR_SENSOR)) //invert bits
int1 flag=0, bit;
int8 code, adress;
int16 i, j, tmp;
int make_8_from_16(long word, short high_low);
#int_EXT
void EXT_isr() {
flag=1; //IR transmit
}
void main() {
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
ext_int_edge(H_TO_L);
j=0;
while(1)
{
if(flag==1) //half first start bit
{
tmp=0;
delay_us(400); //second half first start bit
for(i=0;i<14;i++) //14 bit (start bits + addres + code)
{
bit=IR;
if (bit==1)
tmp++;
tmp<<=1;
delay_us(1775); //wait 1,776ms for next bit
}
code=0;
adress=0;
code=make_8_from_16(tmp,0);
code&= 0b00111111; //only 6-bit
tmp>>=6; //delete code bits from tmp
adress=make_8_from_16(tmp, 0);
adress&= 0b00011111; //only 5-bit
if(code && adress)
{
printf("a: %x ", adress);
printf("c: %x ", code);
}
flag=0;
enable_interrupts(GLOBAL);
}
}
}
int make_8_from_16(long word, short high_low)
{
#BYTE word0 = word
#BYTE word1 = word + 1
if(high_low == 1)
return(word1);
else
return(word0);
} |
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jds-pic
Joined: 17 Sep 2003
Posts: 205
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| Posted: Wed Jan 05, 2005 4:05 pm |
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example of problem please?
i.e.,
what is your input?
what is the expected output?
what is the incorrect output?
jds-pic |
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tomi7
Joined: 15 Sep 2004
Posts: 5
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| Posted: Thu Jan 06, 2005 1:30 pm |
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I use TSOP1738 as IR receiver. Transmition rs-232 works correcly.
Decoding rc5 is wrong, if a press "1" key I get code 30h in place of 01h,
"2" - 28h
"3" - 20h
"4" - 18h
etc... |
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CMOS
Joined: 09 Oct 2006
Posts: 1
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| Posted: Mon Oct 09, 2006 1:56 pm |
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| Have you managed to successfully decode RC5 signals? If yes can your please share your code? |
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