static void _cb(int gpio, int level, uint32_t tick, void *user)
{
Pi_Hasher_t * hasher;
hasher = user;
if (level != PI_TIMEOUT)
{
if (hasher->in_code == 0)
{
hasher->in_code = 1;
gpioSetWatchdog(gpio, hasher->timeout);
hasher->hash_val = 2166136261U; /* FNV_BASIS_32 */
hasher->edges = 1;
hasher->t1 = 0;
hasher->t2 = 0;
hasher->t3 = 0;
hasher->t4 = tick;
}
else
{
hasher->edges++;
hasher->t1 = hasher->t2;
hasher->t2 = hasher->t3;
hasher->t3 = hasher->t4;
hasher->t4 = tick;
if (hasher->edges > 3)
{
hasher->hash_val =
_hash(hasher->hash_val,
(hasher->t2)-(hasher->t1),
(hasher->t4)-(hasher->t3));
}
}
}
else
{
if (hasher->in_code)
{
hasher->in_code = 0;
gpioSetWatchdog(gpio, 0);
if (hasher->edges > 12) /* Anything less is probably noise. */
{
(hasher->callback)(hasher->hash_val);
}
}
}
}
void Hasher::_callback(int gpio, int level, uint32_t tick)
{
if (level != PI_TIMEOUT)
{
if (in_code == 0)
{
in_code = 1;
gpioSetWatchdog(mygpio, mytimeout);
hash_val = 2166136261U; /* FNV_BASIS_32 */
edges = 1;
t1 = 0;
t2 = 0;
t3 = 0;
t4 = tick;
}
else
{
edges++;
t1 = t2;
t2 = t3;
t3 = t4;
t4 = tick;
if (edges > 3) _hash(t2-t1, t4-t3);
}
}
else
{
if (in_code)
{
in_code = 0;
gpioSetWatchdog(mygpio, 0);
if (edges > 12) /* Anything less is probably noise. */
{
(mycallback)(hash_val);
}
}
}
}
void _cb(int gpio, int level, uint32_t tick, void *user)
{
/*
Accumulate bits until both gpios 0 and 1 timeout.
*/
Pi_Wieg_t *wieg;
wieg = user;
if (level == 0) /* a falling edge indicates a new bit */
{
if (!wieg->in_code)
{
wieg->bits = 1;
wieg->num = 0;
wieg->in_code = 1;
wieg->code_timeout = 0;
gpioSetWatchdog(wieg->mygpio_0, wieg->mytimeout);
gpioSetWatchdog(wieg->mygpio_1, wieg->mytimeout);
}
else
{
wieg->bits++;
wieg->num <<= 1;
}
if (gpio == wieg->mygpio_0)
{
wieg->code_timeout &= 2; /* clear gpio 0 timeout */
}
else
{
wieg->code_timeout &= 1; /* clear gpio 1 timeout */
wieg->num |= 1;
}
}
else if (level == PI_TIMEOUT)
{
if (wieg->in_code)
{
if (gpio == wieg->mygpio_0)
{
wieg->code_timeout |= 1; /* timeout gpio 0 */
}
else
{
wieg->code_timeout |= 2; /* timeout gpio 1 */
}
if (wieg->code_timeout == 3) /* both gpios timed out */
{
gpioSetWatchdog(wieg->mygpio_0, 0);
gpioSetWatchdog(wieg->mygpio_1, 0);
wieg->in_code = 0;
(wieg->mycallback)(wieg->bits, wieg->num);
}
}
}
}