adc lowpass first reading initialisation

p3p · Nov 11, 2019 · 91b9f7c · 91b9f7c
1 parent f76552d
commit 91b9f7c
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/package.json b/package.json
@@ -2,5 +2,5 @@
     "name": "framework-arduino-lpc176x",
     "description": "Arduino Wiring-based Framework (LPC176x CMSIS 5)",
     "url": "https://www.arduino.cc/en/Main/Software",
-    "version": "0.2.1"
+    "version": "0.2.2"
 }
diff --git a/system/lpc176x/adc.h b/system/lpc176x/adc.h
@@ -298,9 +298,9 @@ struct ADC {
   };
 
   struct LowpassFilter {
-    uint32_t data_delay = 0x7FFF << ADC_LOWPASS_K_VALUE;
+    uint32_t data_delay = 0xFFFFFFFF;
     [[gnu::always_inline]] inline uint16_t update(uint16_t value) {
-      data_delay = data_delay - (data_delay >> ADC_LOWPASS_K_VALUE) + value;
+      data_delay = data_delay == 0xFFFFFFFF ? value << ADC_LOWPASS_K_VALUE : data_delay - (data_delay >> ADC_LOWPASS_K_VALUE) + value;
       return (uint16_t)(data_delay >> ADC_LOWPASS_K_VALUE);
     }
   };