Hi Naga,
I did some RC5 controlled projects last year.
I did some searching but i could only find some of my test code.
You should read the info found on http://www.sbprojects.com/knowledge/ir/rc5.htm this will give you an idea of how it works and a schematic ...
Best regards, UB
Code:
'==== Set fuses =========================
@ device pic10F202,wdt_off,mclr_off,protect_off
'==== Set XTAL =========================
DEFINE OSC 4 ' int XTAL @ 4 Mhz
'==== Set variables ======================
Y VAR word ' To Hold the 12-bit RC5 code
TMP var BYTE
'==== Set IO ===========================
IR_PIN VAR GPIO.3 ' GPIO.0 input pin reading IR data
SDA var GPIO.0
SCL var GPIO.1
'errled var GPIO.2
OPTION_REG.7 = 0 ' Internal pull-ups = on
TRISIO = %00001000 ' Set TRIS register input's & output's
OPTION_REG.5 = 0 ' Set Timer inc. on internal inst.
GPIO = %00000000 ' Set all digital low
'==== Signal information ==================
'Given the information found on http://www.sbprojects.com/knowledge/ir/rc5.htm
'
'bit 1 2 3 4 5 6 7 8 9 10 11 12 13 14
' | | | | | | | | | | | | | | |
'uSec 1778 1778 1778 1778 1778 1778 1778 1778 1778 1778 1778 1778 1778 1778
'==== Main program ======================
MAIN:
IF IR_PIN = 1 THEN GOTO MAIN ' Wait for the first bit to arive
y.13 = IR_PIN ' Incoming signal
pauseus 889 ' In order to see this 0 we are in the second
' period of the first 1.778 msec, so we will
' wait another 889 usec to enter the 2nd period.
pauseus 1600 ' Almost at the end of the second period, look for
y.12 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.11 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.10 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.9 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.8 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.7 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.6 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.5 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.4 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.3 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.2 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.1 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
pauseus 1600 ' Almost at the end of this period, look for
y.0 = IR_pin ' a high or low signal
pauseus 178 ' Time to the end of this period
y = ~y ' Invert y word
if Y.lowbyte = 255 then goto ERROR ' If all lowbytes are 0xFF then noise is received
TMP.1 = Y.13
TMP.0 = Y.12
if not tmp = 3 then goto error
TMP.4 = Y.10
TMP.3 = Y.9
TMP.2 = Y.8
TMP.1 = Y.7
TMP.0 = Y.6
if not tmp = 0 then goto error
TMP.2 = Y.5
TMP.1 = Y.4
TMP.0 = Y.3
if tmp > 0 then goto error
TMP.2 = Y.2
TMP.1 = Y.1
TMP.0 = Y.0
' TMP now holds the decoded RC5 signal
'==== End of main loop reset and go from top ====
ERROR:
Y=0
tmp=0 ' Clear key codes
PAUSE 250 ' debounce
GOTO MAIN ' Return to main loop
END
Timer + rc5
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