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Update 'USB config & command protocol'

Triss 2021-08-01 00:30:35 +00:00
parent f69bf0703b
commit 7dbcae4517
1 changed files with 13 additions and 8 deletions
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21
USB-config-%26-command-protocol.md

@ -172,16 +172,21 @@ peripheral modes
additional peripheral ops
- `0x83` report timing (returns a measurement of the time taken between one controller query and the next)
## Mode 3 (JTAG pinout scanner) (not yet implemented)
## Mode 3 (JTAG/SWD/... pinout scanner) (not yet implemented)
* Scan types:
* JTAG: 0
* SWD: 1
* `0x33`: Get status: no argument bytes, one result byte
* `0x00`: idle
* `0x01`: scan busy
* `0x02`: scan failed
* `0x03`: scan successful
* `0x34`: Get scan result (only if status is `0x03`): no argument bytes, 5 result bytes
* Result: pin numbers of TCK, TMS, TDI, TDO, TRST
* `0x35`: Start scan (only valid if status is not `0x01`): two argument bytes (start and end pin numbers, inclusive), no result bytes
* `0x0x`: scan busy (type: x, eg. 0x00 = JTAG busy, 0x01 = SWD busy)
* `0x7f`: idle
* `0b1xxxxxxx`: scan finished, `0bxxxxxxx` matches found
* `0x34`: Get scan result (only if status is finished): no argument bytes, 8\*x (JTAG) or 6\*x (SWD) result bytes
* result: for each match:
* JTAG: all bytes: pin numbers of TCK, TMS, TDI, TDO, nTRST, IR length, # of pins toggled, "possibly a short-circuit" warning flag
* SWD: swclk, swdio pin numbers (bytes), manufacturer and part numbers (16 bits each, little-endian)
* `0x35`: Start scan (only valid if status is not `0x01`): three argument bytes (scan type, start and end pin numbers (inclusive)), no result bytes
## Mode 4 (SUMP logic analyzer)