433 mhz RF comms using external AVR MCU (advice on serial protocol needed)

Do you have any docs on your AzzyRF protocol (maybe Espruino code to transmit?). I'm actually planning on doing some demos with something on 433Mhz (using a PC to decode, and an Espruino to encode) and it'd be nice to publish the JS for that.

From the code I can find it looks like:

• 30x 0.2ms on, 0.2ms off training pulse
  
• 2ms delay (while off)
  
• Transmit bits MSB first, on for 0.55ms for 1, 0.3ms for 0, then off for 0.42ms
  
• Delay 2ms before a repeat
  
  

packet format is (lifted from your code):

The first byte of packets is:
| SZ1 | SZ0 | A5 | A4 | A3 | A2 | A1 | A0 |
A5~0: Address bits - 6 bit address of the device, compared to MyAddress. Only packets matching address are processed.
SZ1~SZ0: Size setting
SZ1=0, SZ0=0: 4 bytes
SZ1=0, SZ0=1: 8 bytes
SZ1=1, SZ0=0: 16 bytes
SZ1=1, SZ0=1: 32 bytes
The next two bytes go into MyCmd and MyParam, respectively, if the transmission is accepted (ie, device address matches and checksum is OK)
In a 4 byte packet, the first 4 bits of the last byte goes into MyExtParam (extended parameter), and the last 4 bits are the checksum.
For all longer packets, the whole fourth byte goes into MyExtParam, and the final byte is the checksum.
For 4 byte packets, checksum is calculated by XORing the first three bytes, then XORing the first 4 bits of the result with the last 4 bits, and the first 4 bits of the fourth byte.
For longer packets, checksum is calculated by XORing all bytes of the packet.