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