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All Atmel-provided CMSIS-DAP devices use 512 byte packet size 45/2045/3
authorJörg Wunsch <openocd@uriah.heep.sax.de>
Fri, 14 Mar 2014 10:00:54 +0000 (11:00 +0100)
committerSpencer Oliver <spen@spen-soft.co.uk>
Mon, 17 Mar 2014 12:49:07 +0000 (12:49 +0000)
commit325066149fd03a0cdece9e2fd14d5b12f98d5f2e
tree332b69d5a039a465e5f4085e5ed39e111ac5d53atree | snapshot
parent0c7db47e58e5fe267219735630cd004b504e8535commit | diff
All Atmel-provided CMSIS-DAP devices use 512 byte packet size

The existing CMSIS-DAP driver matches the USB VID/PID against 0x3eb
(Atmel VID) and 0x2111 (Atmel EDBG embedded CMSIS-DAP debugger), and
then bumps the packet size from its default of 64 to 512.  However, it
turned out that *all* Atmel-provided CMSIS-DAP devices (EDBG with PID
0x2111; JTAGICE3 with firmware version 3.x, PID 0x2140; new Atmel-ICE
[successor of JTAGICE3], PID 0x2141) require a 512-byte packet size.
Obviously, all run the same USB implementation inside their custom
microcontroller.  Thus, it seems best to simply assume that *all*
Atmel CMSIS-DAP devices use this packet size, and don't check the PID
at all.

This has also been filed as Trac bug #68:

https://sourceforge.net/apps/trac/openocd/ticket/68

Change-Id: I942af93060fdf265fca3961841638caa6182f877
Signed-off-by: Jörg Wunsch <openocd@uriah.heep.sax.de>
Reviewed-on: http://openocd.zylin.com/2045
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Andrey Yurovsky <yurovsky@gmail.com>
src/jtag/drivers/cmsis_dap_usb.c diff | blob | history
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