From 4986d60e615d3b2bd04a95ba1b3b8f8602df6ab4 Mon Sep 17 00:00:00 2001
From: Andreas Watterott <1488433+awatterott@users.noreply.github.com>
Date: Wed, 18 Apr 2018 16:08:21 +0200
Subject: [PATCH]  proper handling of ADMUXA + ADMUXB (ATtiny8x1)

---
 cores/arduino/wiring_analog.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
index 967c2b976..63167cac5 100644
--- a/cores/arduino/wiring_analog.c
+++ b/cores/arduino/wiring_analog.c
@@ -69,6 +69,9 @@ int analogRead(uint8_t pin)
 #else
 	ADMUX = (analog_reference << 6) | (pin & 0x07);
 #endif
+#elif defined(ADMUXA)
+	ADMUXA = (pin & 0x07);
+	ADMUXB = (analog_reference << 5);
 #endif
 
 	// without a delay, we seem to read from the wrong channel