entwurf einer irempfargstatemachine skizziert....
sry mehr ging heute einfach nicht mehr.... wir sollten um schnell was zu haben mal eine solche kacke runtercoden, und das senden dann dementsprechend machen.... ich schlage vor das eine msg immer 2 byte lang ist ... sowas wie adresse, keycode ... oder eben einfach eine temperatur oder wtf.... jedenfalls feste länge....
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@ -43,8 +43,6 @@ ISR(TIMER2_COMPA_vect,ISR_NOBLOCK) {
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ISR(TIMER0_COMPA_vect) {
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// (2*38)kHz ISR
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//
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//generate 38kHz signal:
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if(ir_active) {
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PORTD ^= 1 << 2;
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@ -53,11 +51,59 @@ ISR(TIMER0_COMPA_vect) {
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//quaterdivider for wait_ms
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if(!(timerdivider & 0x03)) {
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--wait_time;
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--wait_time;
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}
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}
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#if 0
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pinchangeportisr(ireingangport)
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{
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if pinchanged is ir input:
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if ir inactive
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irrstate = IRR_IDLE
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return
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time_since_last = timedivider - oldtime //2d handle overflow
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//State machine:
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select (irrstate){
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case ( IRR_IDLE):
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irrstate = IRR_AWAIT_START_COMP;
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…
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break;
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case (IRR_AWAIT_START_COMP):
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//check for transition in time
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if (time_since_last > IR_MAX_STARTBIT_TICKS)
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{
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irrstate = IRR_GET_BIT_FIRSTHALF;
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bitnum = 0;
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} else { irrstate = IRR_IDLE // errorreset}
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break;
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case (IRR_GET_BIT_FIRSTHALF)
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//check beeing in time
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// -> buffer bit[bitnum]
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// else reset
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irrstate = IRR_GET_BIT_SECHALF;
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break;
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case (IRR_GET_BIT_SECHALF)
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//check beeing in time
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// -> inc bitnum
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// -> irrstate = (maxbits)?IRR_GET_STOP_COND:IRR_GET_BIT_FIRSTHALF;
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// else reset
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…
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break;
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case (IRR_GET_STOP_COND):
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//check beeing in time <- need macro for this :-)
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//-> mark received done and set ir inactive (mainloop has to poll done or idle loop callback registration?)
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//-> else reset
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}
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}
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#endif
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void init_hw(void) {
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// we need to get real fast (8MHz) to handle 38kHz IR frequency ...
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