Diff: SerialStream.h

Revision:

4:85b98cc04a0a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SerialStream.h	Tue Jul 21 22:00:26 2020 -0700
@@ -0,0 +1,55 @@
+#ifndef SERIALSTREAM_H
+#define SERIALSTREAM_H
+
+#include <platform/Stream.h>
+
+/**
+ * SerialStream
+ * Bringing MBed serial ports back like it's 1999... or at least 2019.
+ *
+ * This class adapts an MBed 6.0 serial port class into a Stream instance.
+ * This lets you do two useful things with it:
+ * - Call printf() and scanf() on it
+ * - Pass it to code that expects a Stream to print things on.
+ *
+ */
+template<class SerialClass>
+class SerialStream : public Stream
+{
+	SerialClass & serialClass;
+
+public:
+
+	/**
+	 * Create a SerialStream from a serial port.
+	 * @param _serialClass BufferedSerial or UnbufferedSerial instance
+	 * @param name The name of the stream associated with this serial port (optional)
+	 */
+	SerialStream(SerialClass & _serialClass, const char *name = nullptr):
+	Stream(name),
+	serialClass(_serialClass)
+	{
+	}
+
+
+private:
+
+	// override Stream::read() and write() to call serial class directly.
+	// This avoids the overhead of feeding in individual characters.
+	virtual ssize_t write(const void *buffer, size_t length)
+	{
+		return serialClass.write(buffer, length);
+	}
+
+	virtual ssize_t read(void *buffer, size_t length)
+	{
+		return serialClass.read(buffer, length);
+	}
+
+	// Dummy implementations -- these will never be called because we override write() and read() instead.
+	// but we have to override them since they're pure virtual.
+	virtual int _putc(int c) { return 0; }
+	virtual int _getc() { return 0; }
+};
+
+#endif //SERIALSTREAM_H