support for serial read/write buffer (#384)

docs/reference/serial.md

@@ -10,10 +10,17 @@ serial.writeString("");
 serial.readUntil(",");
 serial.readLine();
 serial.readString();
-serial.redirect(SerialPin.P0, SerialPin.P0, BaudRate.BaudRate115200);
 serial.onDataReceived(",", () => {})
 ```
 
+### Advanced
+
+```cards
+serial.redirect(SerialPin.P0, SerialPin.P0, BaudRate.BaudRate115200);
+serial.writeBuffer(pins.createBuffer(0));
+serial.readBuffer(64);
+```
+
 ### See Also
 
 [writeLine](/reference/serial/write-line), [writeNumber](/reference/serial/write-number), [writeValue](/reference/serial/write-value), [writeString](/reference/serial/write-string), [readLine](/reference/serial/read-line), [redirect](/reference/serial/redirect-to)

docs/reference/serial/read-buffer.md

@@ -0,0 +1,12 @@
+# Serial Read Buffer
+
+Read the buffered serial data as a buffer
+
+```sig
+serial.readBuffer(64);
+```
+
+### Returns
+
+* a Buffer containing input from the serial port. Empty if no data available.
+

docs/reference/serial/write-buffer.md

@@ -0,0 +1,11 @@
+# Serial Write Buffer
+
+Write a buffer to the [serial](/device/serial) port.
+
+```sig
+serial.writeBuffer(pins.createBuffer(0));
+```
+
+### Parameters
+
+* `buffer` is the buffer to write to the serial port