| /* | |
| Arduino Yún USB-to-Serial | |
| Allows you to use the YunShield/Yún processor as a | |
| serial terminal for the Linux side on the Yún. | |
| Upload this to a YunShield/Yún via serial (not WiFi) then open | |
| the serial monitor at 115200 to see the boot process of Linux. | |
| You can also use the serial monitor as a basic command line | |
| interface for Linux 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 | |
| '~' followed by '~' -> Sends the bridge's shutdown command to | |
| obtain the console. | |
| The circuit: | |
| YunShield/Yún | |
| created March 2013 | |
| by Massimo Banzi | |
| modified by Cristian Maglie | |
| This example code is in the public domain. | |
| http://www.arduino.cc/en/Tutorial/YunSerialTerminal | |
| */ | |
| long linuxBaud = 250000; | |
| void setup() { | |
| SERIAL_PORT_USBVIRTUAL.begin(115200); // open serial connection via USB-Serial | |
| SERIAL_PORT_HARDWARE.begin(linuxBaud); // open serial connection to Linux | |
| } | |
| boolean commandMode = false; | |
| void loop() { | |
| // copy from USB-CDC to UART | |
| int c = SERIAL_PORT_USBVIRTUAL.read(); // read from USB-CDC | |
| if (c != -1) { // got anything? | |
| if (commandMode == false) { // if we aren't in command mode... | |
| if (c == '~') { // Tilde '~' key pressed? | |
| commandMode = true; // enter in command mode | |
| } else { | |
| SERIAL_PORT_HARDWARE.write(c); // otherwise write char to UART | |
| } | |
| } else { // if we are in command mode... | |
| if (c == '0') { // '0' key pressed? | |
| SERIAL_PORT_HARDWARE.begin(57600); // set speed to 57600 | |
| SERIAL_PORT_USBVIRTUAL.println("Speed set to 57600"); | |
| } else if (c == '1') { // '1' key pressed? | |
| SERIAL_PORT_HARDWARE.begin(115200); // set speed to 115200 | |
| SERIAL_PORT_USBVIRTUAL.println("Speed set to 115200"); | |
| } else if (c == '2') { // '2' key pressed? | |
| SERIAL_PORT_HARDWARE.begin(250000); // set speed to 250000 | |
| SERIAL_PORT_USBVIRTUAL.println("Speed set to 250000"); | |
| } else if (c == '3') { // '3' key pressed? | |
| SERIAL_PORT_HARDWARE.begin(500000); // set speed to 500000 | |
| SERIAL_PORT_USBVIRTUAL.println("Speed set to 500000"); | |
| } else if (c == '~') { // '~` key pressed? | |
| SERIAL_PORT_HARDWARE.write((uint8_t *)"\xff\0\0\x05XXXXX\x7f\xf9", 11); // send "bridge shutdown" command | |
| SERIAL_PORT_USBVIRTUAL.println("Sending bridge's shutdown command"); | |
| } else { // any other key pressed? | |
| SERIAL_PORT_HARDWARE.write('~'); // write '~' to UART | |
| SERIAL_PORT_HARDWARE.write(c); // write char to UART | |
| } | |
| commandMode = false; // in all cases exit from command mode | |
| } | |
| } | |
| // copy from UART to USB-CDC | |
| c = SERIAL_PORT_HARDWARE.read(); // read from UART | |
| if (c != -1) { // got anything? | |
| SERIAL_PORT_USBVIRTUAL.write(c); // write to USB-CDC | |
| } | |
| } | |