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Merge pull request #12488 from amunra68/patch-1

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Update xsns_06_dht.ino
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Theo Arends 2021-06-27 12:43:07 +02:00 committed by GitHub
commit 70a2e98d58
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1 changed files with 12 additions and 10 deletions
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22
tasmota/xsns_06_dht.ino
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@ -47,18 +47,21 @@ struct DHTSTRUCT {
float h = NAN;
} Dht[DHT_MAX_SENSORS];
bool DhtWaitState(uint32_t sensor, uint32_t level)
// changed from bool to unsigned long returning the time to wait until state changes
unsigned long DhtWaitState(uint32_t sensor, uint32_t level)
{
unsigned long timeout = micros() + 100;
unsigned long startms = micros();
while (digitalRead(Dht[sensor].pin) != level) {
if (TimeReachedUsec(timeout)) {
AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " %s " D_PULSE),
(level) ? D_START_SIGNAL_HIGH : D_START_SIGNAL_LOW);
return false;
return 0; // return 0 (==false for compatibility) if timeout reached
}
delayMicroseconds(1);
}
return true;
return micros()-startms;
}
bool DhtRead(uint32_t sensor)
@ -78,7 +81,8 @@ bool DhtRead(uint32_t sensor)
break;
case GPIO_DHT22: // DHT21, DHT22, AM2301, AM2302, AM2321
// delay(2); // minimum 1ms
delayMicroseconds(2000); // See https://github.com/arendst/Tasmota/pull/7468#issuecomment-647067015
// delayMicroseconds(2000); // See https://github.com/arendst/Tasmota/pull/7468#issuecomment-647067015
delayMicroseconds(1100); // changed to Arduino DHT library value
break;
case GPIO_SI7021: // iTead SI7021
delayMicroseconds(500);
@ -133,14 +137,12 @@ bool DhtRead(uint32_t sensor)
uint32_t i = 0;
noInterrupts();
if (DhtWaitState(sensor, 0) && DhtWaitState(sensor, 1) && DhtWaitState(sensor, 0)) {
if (DhtWaitState(sensor, 0)) { // only wait for one state change to 0
for (i = 0; i < 40; i++) {
if (!DhtWaitState(sensor, 1)) { break; }
delayMicroseconds(32); // Was 30
if (digitalRead(Dht[sensor].pin)) {
dht_data[i / 8] |= (1 << (7 - i % 8));
}
if (!DhtWaitState(sensor, 0)) { break; }
int wt = DhtWaitState(sensor,0); // determine time to change state
if(wt==0) break;
if(wt>50) dht_data[i / 8] |= (1 << (7 - i % 8)); // if longer than 50 usec then 1, else 0
}
}
interrupts();