Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Last revisionBoth sides next revision | ||
| projects:acb8300 [2016/01/25 22:51] – Andreas Böhler | projects:acb8300 [2016/01/25 23:19] – Andreas Böhler | ||
|---|---|---|---|
| Line 63: | Line 63: | ||
| The USB protocol consists of input reports and output reports, with a fixed length of 43 bytes. The host speaks first, the device responds (most of the time). The first byte is always the command byte, the remaining bytes are either payload or junk. The byte numbers of the table start with the payload, so you have to strip the first byte anyway. | The USB protocol consists of input reports and output reports, with a fixed length of 43 bytes. The host speaks first, the device responds (most of the time). The first byte is always the command byte, the remaining bytes are either payload or junk. The byte numbers of the table start with the payload, so you have to strip the first byte anyway. | ||
| + | |||
| + | They seem to not clear the send buffer before responding to a command. Thus, you always get the remaining bytes of the previous commands as well! | ||
| ==== Initialisation ==== | ==== Initialisation ==== | ||
| Line 90: | Line 92: | ||
| ^ Bytes ^ Format ^ Description ^ | ^ Bytes ^ Format ^ Description ^ | ||
| - | | 0-7 | double | M[1][3] | | + | | 0-7 | double | M[1][2] | |
| | 8-15 | double | M[2][0] | | | 8-15 | double | M[2][0] | | ||
| | 16-23 | double | M[2][1] | | | 16-23 | double | M[2][1] | | ||