Add set-i2c-baud-rate.js

packages/usb/set-i2c-baud-rate.js

@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+const path = require('path');
+const uhk = require('./uhk');
+const device = uhk.getUhkDevice();
+
+let programName = path.basename(process.argv[1]);
+
+if (process.argv.length !== 3) {
+    console.log(`Usage: ${programName} <baud rate in Hz>
+Adjust the frequency of the main I2C bus via which the right keyboard half communicates with the left half and the add-on modules.
+Example values:
+    * 400000 Hz - Highest speed. This will probably make communication unreliable. Not recommended.
+    * 100000 Hz - Default speed. Should work in most cases.
+    * 10000 Hz - Low speed. Should help when connection is spotty. It'll make initial LED display updates visibly slower.
+You're free to use any value in between and test the results.`);
+    process.exit(1);
+}
+
+let bps = process.argv[2];
+let buffer = new Buffer(uhk.pushUint32([uhk.usbCommands.setI2cBaudRate], +bps));
+console.log(buffer);
+device.write(uhk.getTransferData(buffer));
+const response = Buffer.from(device.readSync());
+console.log(response);

packages/usb/uhk.js

@@ -14,6 +14,22 @@ function bufferToString(buffer) {
     return str;
 }
 
+function getUint16(buffer, offset) {
+    return (buffer[offset]) + (buffer[offset+1] * 2**8);
+}
+
+function getUint32(buffer, offset) {
+    return (buffer[offset]) + (buffer[offset+1] * 2**8) + (buffer[offset+2] * 2**16) + (buffer[offset+3] * 2**24);
+}
+
+function pushUint32(array, value) {
+    array.push((value >> 0) & 0xff);
+    array.push((value >> 8) & 0xff);
+    array.push((value >> 16) & 0xff);
+    array.push((value >> 24) & 0xff);
+    return array;
+}
+
 function getUhkDevice() {
     const foundDevice = HID.devices().find(device =>
         device.vendorId === 0x1d50 && device.productId === 0x6122 &&
@@ -57,6 +73,9 @@ let eepromOperations = {
 
 exports = module.exports = moduleExports = {
     bufferToString,
+    getUint16,
+    getUint32,
+    pushUint32,
     getUhkDevice,
     getBootloaderDevice,
     getTransferData,
@@ -78,6 +97,7 @@ exports = module.exports = moduleExports = {
         setLedPwmBrightness     : 0x0d,
         getModuleProperty       : 0x0e,
         getSlaveI2cErrors       : 0x0f,
+        setI2cBaudRate          : 0x10,
     },
     enumerationModes: {
         bootloader: 0,