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Fix DS18x20 driver (#7879)

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Fix DS18x20 driver (#7879)
This commit is contained in:
Theo Arends 2020-03-10 16:54:06 +01:00
parent 2d6ced9521
commit eaf0e352a9
1 changed files with 46 additions and 29 deletions
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75
tasmota/xsns_05_ds18x20.ino
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@ -89,6 +89,10 @@ uint8_t OneWireReset(void)
digitalWrite(ds18x20_pin, LOW); digitalWrite(ds18x20_pin, LOW);
delayMicroseconds(480); delayMicroseconds(480);
pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor
delayMicroseconds(70);
uint8_t r = !digitalRead(ds18x20_pin);
delayMicroseconds(410);
return r;
} else { } else {
digitalWrite(ds18x20_pin_out, HIGH); digitalWrite(ds18x20_pin_out, HIGH);
do { do {
@ -100,11 +104,11 @@ uint8_t OneWireReset(void)
digitalWrite(ds18x20_pin_out, LOW); digitalWrite(ds18x20_pin_out, LOW);
delayMicroseconds(480); delayMicroseconds(480);
digitalWrite(ds18x20_pin_out, HIGH); digitalWrite(ds18x20_pin_out, HIGH);
delayMicroseconds(70);
uint8_t r = !digitalRead(ds18x20_pin);
delayMicroseconds(410);
return r;
} }
delayMicroseconds(70);
uint8_t r = !digitalRead(ds18x20_pin);
delayMicroseconds(410);
return r;
} }
void OneWireWriteBit(uint8_t v) void OneWireWriteBit(uint8_t v)
@ -126,26 +130,27 @@ void OneWireWriteBit(uint8_t v)
delayMicroseconds(delay_high[v]); delayMicroseconds(delay_high[v]);
} }
uint8_t OneWireReadBit(void) uint8_t OneWire1ReadBit(void)
{ {
if (!ds18x20_dual_mode) { pinMode(ds18x20_pin, OUTPUT);
pinMode(ds18x20_pin, OUTPUT); digitalWrite(ds18x20_pin, LOW);
digitalWrite(ds18x20_pin, LOW); delayMicroseconds(3);
delayMicroseconds(3); pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor
pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor delayMicroseconds(10);
delayMicroseconds(10); uint8_t r = digitalRead(ds18x20_pin);
uint8_t r = digitalRead(ds18x20_pin); delayMicroseconds(53);
delayMicroseconds(53); return r;
return r; }
} else {
digitalWrite(ds18x20_pin_out, LOW); uint8_t OneWire2ReadBit(void)
delayMicroseconds(3); {
digitalWrite(ds18x20_pin_out, HIGH); digitalWrite(ds18x20_pin_out, LOW);
delayMicroseconds(10); delayMicroseconds(3);
uint8_t r = digitalRead(ds18x20_pin); digitalWrite(ds18x20_pin_out, HIGH);
delayMicroseconds(53); delayMicroseconds(10);
return r; uint8_t r = digitalRead(ds18x20_pin);
} delayMicroseconds(53);
return r;
} }
/*------------------------------------------------------------------------------------------*/ /*------------------------------------------------------------------------------------------*/
@ -161,9 +166,17 @@ uint8_t OneWireRead(void)
{ {
uint8_t r = 0; uint8_t r = 0;
for (uint8_t bit_mask = 0x01; bit_mask; bit_mask <<= 1) { if (!ds18x20_dual_mode) {
if (OneWireReadBit()) { for (uint8_t bit_mask = 0x01; bit_mask; bit_mask <<= 1) {
r |= bit_mask; if (OneWire1ReadBit()) {
r |= bit_mask;
}
}
} else {
for (uint8_t bit_mask = 0x01; bit_mask; bit_mask <<= 1) {
if (OneWire2ReadBit()) {
r |= bit_mask;
}
} }
} }
return r; return r;
@ -207,9 +220,13 @@ uint8_t OneWireSearch(uint8_t *newAddr)
} }
OneWireWrite(W1_SEARCH_ROM); OneWireWrite(W1_SEARCH_ROM);
do { do {
id_bit = OneWireReadBit(); if (!ds18x20_dual_mode) {
cmp_id_bit = OneWireReadBit(); id_bit = OneWire1ReadBit();
cmp_id_bit = OneWire1ReadBit();
} else {
id_bit = OneWire2ReadBit();
cmp_id_bit = OneWire2ReadBit();
}
if ((id_bit == 1) && (cmp_id_bit == 1)) { if ((id_bit == 1) && (cmp_id_bit == 1)) {
break; break;
} else { } else {