Fix UART wrong ::available() during wraparound (#739)

Fixes #735 . Thanks to @ Haggarman for the find and fix.

Fix UART wrong ::available() during wraparound (#739)
Fixes #735 . Thanks to @ Haggarman for the find and fix.
cabb06d4 · Earle F. Philhower, III · GitHub · 005cba3a · cabb06d4
Unverified Commit cabb06d4 authored Aug 06, 2022 by Earle F. Philhower, III Committed by GitHub Aug 06, 2022
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cores/rp2040/SerialUART.cpp cores/rp2040/SerialUART.cpp +1 -1

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--- a/cores/rp2040/SerialUART.cpp
+++ b/cores/rp2040/SerialUART.cpp
@@ -292,7 +292,7 @@ int SerialUART::available() {
    } else {
        _pumpFIFO();
    }
-    return (_writer - _reader) % _fifoSize;
+    return (_fifoSize + _writer - _reader) % _fifoSize;
 }

 int SerialUART::availableForWrite() {