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+/*
+ Arduino Yun USB-to-Serial
+
+ Allows you to use the Yun's 32U4 processor as a
+ serial terminal for the linino processor.
+
+ Upload this to an Arduino Yun via serial (not WiFi)
+ then open the serial monitor at 115200 to see the boot process
+ of the linino processor. You can also use the serial monitor
+ as a basic command line interface for the linino processor using
+ this sketch.
+
+ From the serial monitor the following commands can be issued:
+
+ '~' followed by '0' -> Set the UART speed to 57600 baud
+ '~' followed by '1' -> Set the UART speed to 115200 baud
+ '~' followed by '2' -> Set the UART speed to 250000 baud
+ '~' followed by '3' -> Set the UART speed to 500000 baud
+
+ The circuit:
+ * Arduino Yun
+
+ created March 2013
+ by Massimo Banzi
+ modified by Cristian Maglie
+
+ This example code is in the public domain.
+ */
+
+long lininoBaud = 250000;
+
+void setup() {
+ Serial.begin(115200); // open serial connection via USB-Serial
+ Serial1.begin(lininoBaud); // open serial connection to Linino
+}
+
+boolean commandMode = false;
+
+void loop() {
+ // copy from virtual serial line to uart and vice versa
+ if (Serial.available()) { // got anything from USB-Serial?
+ char c = (char)Serial.read(); // read from USB-serial
+ if (commandMode == false) { // if we aren't in command mode...
+ if (c == '~') { // Tilde '~' key pressed?
+ commandMode = true; // enter in command mode
+ } else {
+ Serial1.write(c); // otherwise write char to Linino
+ }
+ } else { // if we are in command mode...
+ if (c == '0') { // '0' key pressed?
+ Serial1.begin(57600); // set speed to 57600
+ Serial.println("Speed set to 57600");
+ } else if (c == '1') { // '1' key pressed?
+ Serial1.begin(115200); // set speed to 115200
+ Serial.println("Speed set to 115200");
+ } else if (c == '2') { // '2' key pressed?
+ Serial1.begin(250000); // set speed to 250000
+ Serial.println("Speed set to 250000");
+ } else if (c == '3') { // '3' key pressed?
+ Serial1.begin(500000); // set speed to 500000
+ Serial.println("Speed set to 500000");
+ } else { // any other key pressed?
+ Serial1.write('~'); // write '~' to Linino
+ Serial1.write(c); // write char to Linino
+ }
+ commandMode = false; // in all cases exit from command mode
+ }
+ }
+ if (Serial1.available()) { // got anything from Linino?
+ char c = (char)Serial1.read(); // read from Linino
+ Serial.write(c); // write to USB-serial
+ }
+}