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fix potential hang (#6976)
Co-authored-by: Samuel Sieb <samuel@sieb.net>
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1 changed files with 4 additions and 2 deletions
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@ -94,13 +94,15 @@ bool HOT IRAM_ATTR GPIOOneWireBus::read_bit_() {
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// measure from start value directly, to get best accurate timing no matter
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// how long pin_mode/delayMicroseconds took
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delayMicroseconds(12 - (micros() - start));
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uint32_t now = micros();
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if (now - start < 12)
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delayMicroseconds(12 - (now - start));
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// sample bus to read bit from peer
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bool r = pin_.digital_read();
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// read slot is at least 60µs; get as close to 60µs to spend less time with interrupts locked
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uint32_t now = micros();
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now = micros();
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if (now - start < 60)
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delayMicroseconds(60 - (now - start));
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