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50 lines
815 B
50 lines
815 B
13 years ago
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// alter drehimpulsgebercode, aus marcus-thermometer
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void buttonpoll(){ // runs with 1.2kHz
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uint8_t l,r,t,flanks,dir;
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l=BUTTPIN & _BV(BUTTLPIN);
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r=BUTTPIN & _BV(BUTTRPIN);
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t=BUTTPIN & _BV(BUTTTPIN);
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// debounce code
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if (t != butttold && !butttbounce ) {
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butttold = t;
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butttbounce = BUTT_BOUNCE;
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if (t == 0) { // active low
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buttonevent |= BUTTEV_PUSH;
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}
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}
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flanks=0;
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dir=0;
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if (l != buttlold) {
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flanks += 1;
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}
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if (r != buttrold) {
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flanks += 1;
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dir = 1;
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}
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if (flanks == 1){ // we need to have exactly one flank, 0 flanks are no
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// change, and 2 flanks are too fast (error)
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if (l) {
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dir ^= 1;
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}
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if (r) {
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dir ^= 1;
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}
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if ((r && l) || (!r && !l)) {
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buttoninc += dir ? -1 : 1;
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}
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}
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buttlold = l;
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buttrold = r;
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if(butttbounce){
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butttbounce -= 1;
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}
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}
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