View source for Project:RELaserSoftware/USB protocol

Vendor: 0548
Product: 1005

The protocol seems to be fairly simple. I have a capture of some file downloads and deleting a file.

looks like:

commands are sent to endpoint 0x04 and read form 0x88, sent commands are (byte)length and then length bytes

commands 5 and 6 seem to be start and end

example command block:

<pre>
>w04 0002     00000000: 01 05
*r88 0001     00000000: 04
>w04 0006     00000000: 05 01 01 83 01 7a
*r88 0001     00000000: 06
*r88 0001     00000000: 05
>w04 0002     00000000: 01 04
*r88 0014     00000000: 0f 01 83 53 51 55 41 52 45 20 20 4d 4f 4c 00 0e
    00000010: 00 00 00 66
>w04 0002     00000000: 01 06
</pre>

That last reply packet includes the ascii for 'SQUARE  MOL' with two spaces in the middle to pad it to 11 characters. This must be a file name in DOS 8.3 format with the . implied between the 8th and 9th characters.

This presumably maps directly to a [http://en.wikipedia.org/wiki/File_Allocation_Table#Directory_table FAT16 entry], so don't let it be null or begin with a dot!

It isn't, the protocol dosn't seem to be doing any block level management at all, looks like the controller is nice enough to do that for us [[User:JasperWallace|JasperWallace]] 01:11, 28 November 2010 (UTC)

All USB command follow the same format:
<pre>
host  01 05:     sending 1 byte: are you there?
laser 04:     yes I am here
host  05 01 01 10 06 e8:     sending 5 bytes, 1 byte payload, always 1, 10 is the command, 06 is the payload, e8 is the checksum
laser 06:     OK, I received and understood (ACK)
laser 05:     host, are you there?
host  01 04:     sending 1 byte, yes i am here
laser 00 01 10 00 ef:     0 bytes payload, always 1, repeating the command sent, payload would be here, 00 is OK (81 is checksum error), checksum
host  01 06:     sending 1 byte, OK (ACK)
</pre>

known command are
* 10 04: start moving back, must be followed by 0e
* 10 05: start moving forward, must be followed by 0e
* 10 06: start moving left, must be followed by 0e to stop the motion
* 10 07: start moving right, must be followed by 0e
* 10 0e: stop motion triggered by 04, 05, 06, 07, 11, 12
* 10 0f: move X and Y home
* 10 11: start moving up (Z), must be followed by 0e
* 10 12: start moving down (Z), must be followed by 0e
* 10 13: move Z home
* 80 nnnnnnnn eee ssss: send file, n is name, e is extension (MOL), s is length of file in bytes, followed by MOL file in 512 bytes blocks
* 81: error?
* 82: download complete?
* 83 n: get filename and length at index n
* 85 cccc: send file checksum after download?
* 87 n: delete file at index n
* 88: start?
* 89: return number of files