Added some brief explanation to README.md

README.md

@@ -1,2 +1,22 @@
 # DigiLivolo
-Firmware & software to control Livolo RF 433 Mhz light switches
+Firmware (for Digispark Arduino compatible module) & software to control Livolo RF 433 Mhz light switches.
+
+# Usage
+Compile & upload firmware to Digispark. Connect DATA pin of 433 Mhz transmitter module (SYN115 based modules
+were used & confirmed to work by me) to P5 of Digispark module (this pin can be changed in main sketch code).
+Also connect VCC & GND of the module. 
+
+Once plugged to USB, the device should be recognized as USB HID device, not requiring any driver as every 
+modern OS have this standard USB class driver built-in.
+
+To send codes to Livolo switches you can use [hidapitester](https://github.com/todbot/hidapitester) for now.
+Work on the dedicated PC control software are in progress.
+
+USB protocol are simple 8 bytes. First are HID REPORT ID, which are hardcoded to 76 (0x4C). 2nd are CMD ID,
+which is only 0x01 (send code) for now. Next 2 bytes are Livolo Remote ID, little-endian (means you have to 
+reverse byte order from "normal" representation). 5th byte are Livolo Key ID. Remaining 3 bytes are reserved
+and not used. They can be left as zeroes.
+
+Example usage:
+
+```hidapitester.exe --vidpid 16c0:05df -l 8 --open --send-feature 76,1,77,33,16```

firmware/lib/DLUSB/DLUSB.cpp

@@ -48,8 +48,7 @@ inline bool store_packet(dlusb_packet_t* packet, ring_buffer* the_buffer)
   return false;
 }
 
-DLUSBDevice::DLUSBDevice(ring_buffer* rx_buffer,
-  ring_buffer* tx_buffer) {
+DLUSBDevice::DLUSBDevice(ring_buffer* rx_buffer, ring_buffer* tx_buffer) {
   _rx_buffer = rx_buffer;
   _tx_buffer = tx_buffer;
 }