LA_presto2.png and LA_jlink_has_reply.png look the same in the first cycles
up to the first reaction from the target on the TDO. Except that the PRESTO
keeps nTRST low the entire time so that's probably why nothing happens.

On Tue, Sep 14, 2021 at 5:53 PM Michal Hucik <ch...@users.sourceforge.net>
wrote:

> I have no idea what that communication should look like.
>
> J-link:
> 1) TMS = 1, 8x CLK = 1.2 MHz, TMS = 0
> 2) 28 ms gap
> 3) TMS = 1, 8 x CLK = 421 kHz, TMS = 0
> 4) 6 ms gap
> 5) CLK = 1.2 MHz - first reply on TDO (LA_jlink_has_reply.png)
>
> PRESTO (CLK is a little crazy, but when is stabilised so is 545 kHz):
> 1) LA_presto_1.png
> 2) 1500 us gap
> 3) LA_presto_2.png
> 4) 4x (7 ms gap and cca 2 us area with some CLK pules)
> 5) 7 ms gap, LA_presto_3.png
> 6) 6 ms gap, LA_presto_4.png
> 7) 6 ms gap, LA_presto_5.png
> 8) 2 ms gap, LA_presto_6.png
> 9) ...and silence...
>
> Attachments:
>
>    - LA_presto_6.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_6.png>
>    (12.5 kB; image/png)
>    - LA_presto_5.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_5.png>
>    (3.8 kB; image/png)
>    - LA_presto_4.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_4.png>
>    (5.5 kB; image/png)
>    - LA_presto_3.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_3.png>
>    (7.9 kB; image/png)
>    - LA_presto_2.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_2.png>
>    (22.1 kB; image/png)
>    - LA_jlink_has_reply.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_jlink_has_reply.png>
>    (6.1 kB; image/png)
>    - LA_presto_1.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_1.png>
>    (4.0 kB; image/png)
>    - LA_jlink_preview.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_jlink_preview.png>
>    (21.9 kB; image/png)
>    - LA_presto_preview.png
>    
> <https://sourceforge.net/p/openocd/tickets/_discuss/thread/81de21a580/36ef/a4cb/5644/e17a/6290/5156/attachment/LA_presto_preview.png>
>    (13.6 kB; image/png)
>
> ------------------------------
>
> * [tickets:#318] <https://sourceforge.net/p/openocd/tickets/318/> adapter
> driver presto - not work*
>
> *Status:* new
> *Milestone:* 0.11.0
> *Created:* Wed Sep 08, 2021 07:25 AM UTC by Michal Hucik
> *Last Updated:* Tue Sep 14, 2021 12:32 PM UTC
> *Owner:* nobody
>
> I'm trying a first time to use Asix PRESTO with OpenOCD. (this Presto is
> normally working with the Asix UP software for Windows)
> I tried to use in Windows precompiled OpenOCD 0.11 and in Linux fresh
> compiled by me.
> In the configuration I use "adapter driver presto", or in addition
> "presto_serial 013979". However, on both systems, OpenOCD cannot correctly
> initialize PRESTO.
>
> ==== Linux dmesg ====
> [395089.615983] usb 2-2.2: new full-speed USB device number 29 using
> uhci_hcd
> [395089.820689] usb 2-2.2: New USB device found, idVendor=0403,
> idProduct=f1a0, bcdDevice= 4.00
> [395089.820693] usb 2-2.2: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [395089.820694] usb 2-2.2: Product: ASIX PRESTO
> [395089.820696] usb 2-2.2: Manufacturer: ASIX
> [395089.820697] usb 2-2.2: SerialNumber: A6013979
>
> ==== OpenOCD --debug ====
> Debug: 56 5 presto.c:139 presto_open_libftdi(): searching for PRESTO using
> libftdi
> Error: 57 7 presto.c:149 presto_open_libftdi(): unable to open PRESTO:
> usb_open() failed
> Error: 58 8 presto.c:540 presto_jtag_init(): Cannot open PRESTO
> Debug: 59 8 command.c:629 run_command(): Command 'init' failed with error
> code -100
> ------------------------------
>
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