meine pinnacle und hauppauge produzieren astreinen RC5 Code, was nicht jede FB macht, dafür ist fertiger Code vorhanden, es genügt ein TSOP1738 und ein Atmel und die RC5 Lib von:
http://www.mikrocontroller.net/topic/12216#new
Edit by BASTIUniversal: Code-Box eingefügt.Code:/************************************************************************/ /* */ /* RC5 Remote Receiver */ /* */ /* Author: Peter Dannegger */ /* danni@specs.de */ /* */ /************************************************************************/ #include <avr/interrupt.h> #include <avr/signal.h> #include <stdlib.h> #define uchar unsigned char #define uint unsigned int #define xRC5_IN PIND #define xRC5 PD7 // IR input low active UWORD rc5_data; // store result #define RC5TIME 1.778e-3 // 1.778msec #define PULSE_MIN (uchar)(F_CPU / 512 * RC5TIME * 0.4 + 0.5) #define PULSE_1_2 (uchar)(F_CPU / 512 * RC5TIME * 0.8 + 0.5) #define PULSE_MAX (uchar)(F_CPU / 512 * RC5TIME * 1.2 + 0.5) uchar rc5_bit; // bit value uchar rc5_time; // count bit time uint rc5_tmp; // shift bits in uint rc5_data; // store result SIGNAL (SIG_OVERFLOW0) { uint tmp = rc5_tmp; // for faster access TCNT0 = -2; // 2 * 256 = 512 cycle // preload for 250µs RC5 if( ++rc5_time > PULSE_MAX ) { // count pulse time if( !(tmp & 0x4000) && tmp & 0x2000 ) // only if 14 bits received rc5_data = tmp; tmp = 0; } if( (rc5_bit ^ xRC5_IN) & 1<<xRC5 ) { // change detect rc5_bit = ~rc5_bit; // 0x00 -> 0xFF -> 0x00 if( rc5_time < PULSE_MIN ) // to short tmp = 0; if( !tmp || rc5_time > PULSE_1_2 ) { // start or long pulse time if( !(tmp & 0x4000) ) // not to many bits tmp <<= 1; // shift if( !(rc5_bit & 1<<xRC5) ) // inverted bit tmp |= 1; // insert new bit rc5_time = 0; // count next pulse time } } rc5_tmp = tmp; }
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