fix: add timeout handling to potentially infinite loop (#78)

RobTillaart · Jul 3, 2024 · bff9430 · bff9430
1 parent 6c86d80
commit bff9430
Show file tree

Hide file tree

Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/ADS1X15.cpp b/ADS1X15.cpp
@@ -451,7 +451,12 @@ int16_t ADS1X15::_readADC(uint16_t readmode)
  _requestADC(readmode);
  if (_mode == ADS1X15_MODE_SINGLE)
  {
- while ( isBusy() ) yield(); // wait for conversion; yield for ESP.
+ unsigned long start = millis();
+ while (isBusy()) {
+ yield(); // wait for conversion; yield for ESP.
+ if ((start + ADS1X15_READ_TIMEOUT_MS) < millis())
+ return ADS1X15_ERROR_TIMEOUT;
+ }
  }
  else
  {
@@ -737,4 +742,3 @@ void ADS1115::requestADC_Differential_2_3()
 
 
 // -- END OF FILE --
-
diff --git a/ADS1X15.h b/ADS1X15.h
@@ -24,9 +24,13 @@
 #define ADS1115_ADDRESS 0x48
 #endif
 
+#ifndef ADS1X15_READ_TIMEOUT_MS
+#define ADS1X15_READ_TIMEOUT_MS 200 //Longest acquisition time is 125ms (8SPS)
+#endif
 
 #define ADS1X15_OK 0
 #define ADS1X15_INVALID_VOLTAGE -100
+#define ADS1X15_ERROR_TIMEOUT -101
 #define ADS1X15_INVALID_GAIN 0xFF
 #define ADS1X15_INVALID_MODE 0xFE
 
@@ -268,4 +272,3 @@ class ADS1115 : public ADS1X15
 
 
 // -- END OF FILE --
-