04:55 <rue_mohr> help

04:55 <rue_mohr> I'm trying to do something stupid

04:55 <rue_mohr> and I dont know enough

04:55 <rue_mohr> I want to use a JTAG adapter to shift data into a &$HC595

04:55 <rue_mohr> lskdfjlksjdf

04:55 <rue_mohr> 74HC595

04:56 <rue_mohr> the lines are serial clock, serial data, and output strobe

04:56 <rue_mohr> please tell me a way I can do this stupid task if you know

04:57 <rue_mohr> cause it will make the world a better place

04:58 <rue_mohr> I can connect the return data line if that helps get around software stuff

04:59 <rue_mohr> oh god, I'm gonna ask openai...

05:00 <rue_mohr> if you know, please speak up

05:04 <rue_mohr> openai: ""

05:04 <rue_mohr> To use the scan_chain command with the TDI looped back to the TDO line, you can use the following command:

05:04 <rue_mohr> openocd -f interface <interface_config_file> -c "adapter_khz <adapter_speed> ; jtag_scan_chain ; jtag_reset ; jtag_scan_chain"

05:04 <rue_mohr> If the TDI is looped back to the TDO line, you should see one device detected on the JTAG chain. If there are no devices detected, or more than one device detected, then there may be an issue with your JTAG adapter or the loopback connection.

05:05 <rue_mohr> ---

05:05 <rue_mohr> is it right?

05:07 <rue_mohr> Hi, I'm Rue, the last living real person on the planet. I use a real IRC client directly with an IRC network, I do not use repeaters or bots.

05:31 <rue_shop3> invalid command name "jtag_scan_chain"

07:50 <rue_shop3> anyone?

07:51 <rue_shop3> the documentation is hopeless I need a human

07:51 <rue_shop3> or to completely learn every line of source code in the project, at which point I might as well write my own software

09:08 <PaulFertser> rue_shop3: hi

09:09 <PaulFertser> rue_shop3: you can try with "irscan" command, it should be almost low-level enoough.

09:09 <PaulFertser> rue_shop3: but are you familiar with the JTAG state machine diagram?

09:11 <PaulFertser> rue_shop3: for irscan it will do few clock cycles with appropriate TMS transitions to go to the appropriate state.

17:48 <rue_mohr> PaulFertser, hey thanks, I think I tried, but it would not go without an init, and init freaked out

17:49 <rue_mohr> at the end of the night, it looked like I might get closer with swd?

17:53 <PaulFertser> rue_mohr: no, swd is certainly less suitable

17:55 <rue_mohr> ? I saw something that used seperate rx tx lines and the clock and it looks like there is no init

17:55 <PaulFertser> rue_mohr: init should be fine if you do not define target

17:55 <PaulFertser> rue_mohr: init is always there, you can't run any non-config command without it.

18:10 <PaulFertser> rue_mohr: for the reference, SWD is using two lines: SWDIO (bidirectional) and SWCLK (clock).

18:18 <rue_mohr> init freaked out that the id did not match and there wasn't a 0x1 at the end

18:18 <PaulFertser> rue_mohr: it didn't mean it failed, just warned you.

18:20 <rue_mohr> hmm, I can show you more in a bit, I have to finish breakfast and grab a shower

19:37 <rue_shop3> whitequark suggests modeling it as a bunch of 1 bit registers

19:38 <rue_shop3> openocd -f interface/ftdi/um232h.cfg -c "transport select jtag; adapter speed 10; jtag newtap foo bs -irlen 1 ; init; irscan foo.bs 1; exit "

19:38 <rue_shop3> the number after irlen, is that bits or bytes?

19:38 <rue_shop3> oh maybe i read that wrong

20:03 <PaulFertser> rue_shop3: bits

20:04 <PaulFertser> rue_shop3: I think defining it as a single register IR of an approriate size would be more fruitful.

20:04 <PaulFertser> rue_shop3: you didn't answer my question re state machine.

22:32 <rue_mohr> I dont know how to operate the state machine

22:32 <rue_mohr> its a 74LS595

23:44 <rue_shop3> ok, it sounds like minimum is 10 bits, so I should set up atleast 2 595

23:44 <rue_shop3> unless I can just use DR

23:45 <rue_shop3> Warn : Haven't made progress in mpsse_flush() for 2002ms.

23:45 <rue_shop3> ^^ what does that error mean?