Update corefiles

Merge commit '547eabccabb65ec1fbdd7affd5558c60a0927a8f'
MCUdude · May 5, 2020 · 4ba1328 · 4ba1328
2 parents f1ca72e + 547eabc
commit 4ba1328
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Showing 3 changed files with 9 additions and 3 deletions.
diff --git a/avr/cores/MCUdude_corefiles/HardwareSerial.h b/avr/cores/MCUdude_corefiles/HardwareSerial.h
@@ -124,7 +124,7 @@ class HardwareSerial : public Stream
     virtual int available(void);
     virtual int peek(void);
     virtual int read(void);
-    int availableForWrite(void);
+    virtual int availableForWrite(void);
     virtual void flush(void);
     virtual size_t write(uint8_t);
     inline size_t write(unsigned long n) { return write((uint8_t)n); }

diff --git a/avr/cores/MCUdude_corefiles/Print.h b/avr/cores/MCUdude_corefiles/Print.h
@@ -57,7 +57,13 @@ class Print
     size_t write(const char *buffer, size_t size) {
       return write((const uint8_t *)buffer, size);
     }
-
+
+    // default to zero, meaning "a single write may block"
+    // should be overriden by subclasses with buffering
+    virtual int availableForWrite() { return 0; }
+
+    virtual void flush() { /* Empty implementation for backward compatibility */ }
+
     size_t print(const __FlashStringHelper *);
     size_t print(const String &);
     size_t print(const char[]);

diff --git a/avr/cores/MCUdude_corefiles/USBAPI.h b/avr/cores/MCUdude_corefiles/USBAPI.h
@@ -98,7 +98,7 @@ class Serial_ : public Stream
   virtual int available(void);
   virtual int peek(void);
   virtual int read(void);
-  int availableForWrite(void);
+  virtual int availableForWrite(void);
   virtual void flush(void);
   virtual size_t write(uint8_t);
   virtual size_t write(const uint8_t*, size_t);