Bugfix - waiting for first ADC read to complete after ADC enable.

adafruit · Sep 15, 2021 · 6ddfddf · 6ddfddf
1 parent bafcb36
commit 6ddfddf
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
@@ -375,6 +375,9 @@ uint32_t analogRead(uint32_t pin)
   syncADC();
   ADC->SWTRIG.bit.START = 1;
 
+  // Waiting for the 1st conversion to complete
+  while (ADC->INTFLAG.bit.RESRDY == 0);
+
   // Clear the Data Ready flag
   ADC->INTFLAG.reg = ADC_INTFLAG_RESRDY;