mirror of https://github.com/joan2937/pigpio
92 lines
1.7 KiB
C++
92 lines
1.7 KiB
C++
#include <pigpio.h>
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#include "ir_hasher.hpp"
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void Hasher::_hash(int old_val, int new_val)
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{
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int val;
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if (new_val < (old_val * 0.60)) val = 13;
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else if (old_val < (new_val * 0.60)) val = 23;
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else val = 2;
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hash_val ^= val;
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hash_val *= 16777619; /* FNV_PRIME_32 */
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}
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void Hasher::_callback(int gpio, int level, uint32_t tick)
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{
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if (level != PI_TIMEOUT)
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{
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if (in_code == 0)
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{
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in_code = 1;
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gpioSetWatchdog(mygpio, mytimeout);
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hash_val = 2166136261U; /* FNV_BASIS_32 */
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edges = 1;
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t1 = 0;
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t2 = 0;
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t3 = 0;
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t4 = tick;
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}
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else
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{
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edges++;
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t1 = t2;
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t2 = t3;
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t3 = t4;
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t4 = tick;
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if (edges > 3) _hash(t2-t1, t4-t3);
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}
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}
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else
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{
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if (in_code)
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{
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in_code = 0;
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gpioSetWatchdog(mygpio, 0);
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if (edges > 12) /* Anything less is probably noise. */
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{
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(mycallback)(hash_val);
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}
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}
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}
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}
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void Hasher::_callbackExt(int gpio, int level, uint32_t tick, void *user)
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{
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/*
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Need a static callback to link with C.
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*/
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Hasher *mySelf = (Hasher *) user;
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mySelf->_callback(gpio, level, tick); /* Call the instance callback. */
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}
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Hasher::Hasher(int gpio, HasherCB_t callback, int timeout)
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{
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/*
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Initialises an IR remote hasher on a gpio. A gap of timeout
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milliseconds indicates the end of the remote key press.
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*/
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mygpio = gpio;
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mycallback = callback;
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mytimeout = timeout;
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in_code = 0;
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gpioSetMode(gpio, PI_INPUT);
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gpioSetAlertFuncEx(gpio, _callbackExt, (void *)this);
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}
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