Add scripts for getting/setting firmware variables (#734)

packages/usb/get-variable.js

@@ -0,0 +1,11 @@
+#!/usr/bin/env node
+
+const uhk = require('./uhk');
+const device = uhk.getUhkDevice();
+const sendData = new Buffer([uhk.usbCommands.getVariable, +process.argv[2]]);
+
+console.log(sendData);
+device.write(uhk.getTransferData(sendData));
+const receivedBuffer = Buffer.from(device.readSync());
+console.log(receivedBuffer[1]);
+

packages/usb/set-variable.js

@@ -0,0 +1,10 @@
+#!/usr/bin/env node
+
+const uhk = require('./uhk');
+const device = uhk.getUhkDevice();
+const sendData = new Buffer([uhk.usbCommands.setVariable, +process.argv[2], +process.argv[3]]);
+
+console.log(sendData);
+device.write(uhk.getTransferData(sendData));
+
+

packages/usb/uhk.js

@@ -450,6 +450,14 @@ uhk = exports = module.exports = moduleExports = {
         getSlaveI2cErrors       : 0x0f,
         setI2cBaudRate          : 0x10,
         switchKeymap            : 0x11,
+        getVariable             : 0x12,
+        setVariable             : 0x13,
+    },
+    usbVariables: {
+        testSwitches        : 0x00,
+        testUsbStack        : 0x01,
+        debounceTimePress   : 0x02,
+        debounceTimeRelease : 0x03,
     },
     enumerationModes: {
         bootloader: 0,