Work around spurious 0-length signals in idf5 (#9)

* Work around spurious 0-length signals in idf5 * Update src/driver_.toit Co-authored-by: Kasper Lund <[email protected]> --------- Co-authored-by: Kasper Lund <[email protected]>
toitware · Sep 12, 2023 · bf69ad9 · bf69ad9
1 parent 007ac2a
commit bf69ad9
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Showing 3 changed files with 6 additions and 2 deletions.
diff --git a/examples/dht11.toit b/examples/dht11.toit
@@ -5,7 +5,7 @@
 import dhtxx
 import gpio
 
-GPIO_PIN_NUM ::=  14
+GPIO_PIN_NUM ::= 14
 
 main:
   pin := gpio.Pin GPIO_PIN_NUM

diff --git a/examples/dht22.toit b/examples/dht22.toit
@@ -5,7 +5,7 @@
 import dhtxx
 import gpio
 
-GPIO_PIN_NUM ::=  14
+GPIO_PIN_NUM ::= 14
 
 main:
   pin := gpio.Pin GPIO_PIN_NUM

diff --git a/src/driver_.toit b/src/driver_.toit
@@ -111,6 +111,10 @@ abstract class Driver:
     channel_in_.start_reading
     channel_out_.write start_signal
     response := channel_in_.read
+    if response.size == 2 and (response.period 0) == 0 and (response.period 1) == 0:
+      // We are getting some spurious signals from the start signal,
+      // which we just ignore.
+      response = channel_in_.read
     channel_in_.stop_reading
 
     // We expect to see: