On a sunny day (Tue, 14 Mar 2023 08:56:56 -0700) it happened John Larkin <jlarkin@highlandSNIPMEtechnology.com> wrote in <q4611ila0vu59j9j87vm4keq0vhm2er042@4ax.com>:>On Tue, 14 Mar 2023 15:41:37 GMT, Jan Panteltje <alien@comet.invalid> >>> >>>I'm thinking of a ribbon cable from the Pi400 to my test board. The >>>test bord has another, small ribbon cable to the DUT. That gets debug >>>access to the Pi Pico on DUT and picks off a bunch of power suypplies >>>and clocks and such, with a standard pinout. The test board also >>>connects to a DVM and a scope and a counter for production test and >>>cal. Muxes on the test board are controlled by the Pi400. >> >>Good idea, a test board, I killed one raspi by shorting an I/O pin >>Some buffers on the test board may prevent that. > > >I have posted some of these in engineering and test: > >https://www.dropbox.com/s/8oefk1v8avr6l7a/Probe_Slips.jpg?raw=1So true..
MOSFET Needed
Started by ●March 8, 2023
Reply by ●March 14, 20232023-03-14
Reply by ●March 14, 20232023-03-14
tirsdag den 14. marts 2023 kl. 16.03.12 UTC+1 skrev John Larkin:> On Tue, 14 Mar 2023 06:53:26 GMT, Jan Panteltje <al...@comet.invalid> > wrote: > >On a sunny day (Mon, 13 Mar 2023 10:58:10 -0700) it happened John Larkin > ><jla...@highlandSNIPMEtechnology.com> wrote in > ><jaou0ilf68jiuqpk9...@4ax.com>: > > > >>>Tried that Pi4 thing yet? > >> > >>I fired it up and got the home screen. That's all so far. I'd hire > >>some programmers to do the real work. I prefer architecture and > >>hardware design lately. > >> > >>I ordered a Pi 400, the keyboard with a Pi inside. That could be our > >>development system. I'm thinking of doing a PCB that would plug into > >>it and have a ribbon cable that runs to our product boards, for debug > >>access and power supply monitoring and such. > > > >Yes that is how I work with it > > https://panteltje.nl/pub/raspberry_pi_datv_transmitter_test_setup_IMG_3937.JPG > > > >Or, if the circuit is small, make a 'HAT'. > > > > > I'm thinking of a ribbon cable from the Pi400 to my test board. The > test bord has another, small ribbon cable to the DUT. That gets debug > access to the Pi Pico on DUT and picks off a bunch of power suypplies > and clocks and such, with a standard pinout. The test board also > connects to a DVM and a scope and a counter for production test and > cal. Muxes on the test board are controlled by the Pi400. > >>We could have a dozen such dev systems, they would be so cheap. > >> > One of my contractors spent two months building a Petalinux > development system on a Dell PC, for a MicroZed project, and > eventually gave up.how is that even possible?
Reply by ●March 15, 20232023-03-15
On a sunny day (Tue, 14 Mar 2023 16:02:48 GMT) it happened Jan Panteltje <alien@comet.invalid> wrote in <tuq5r9$20okj$1@solani.org>:>On a sunny day (Tue, 14 Mar 2023 08:56:56 -0700) it happened John Larkin ><jlarkin@highlandSNIPMEtechnology.com> wrote in ><q4611ila0vu59j9j87vm4keq0vhm2er042@4ax.com>: > >>On Tue, 14 Mar 2023 15:41:37 GMT, Jan Panteltje <alien@comet.invalid> >>>> >>>>I'm thinking of a ribbon cable from the Pi400 to my test board. The >>>>test bord has another, small ribbon cable to the DUT. That gets debug >>>>access to the Pi Pico on DUT and picks off a bunch of power suypplies >>>>and clocks and such, with a standard pinout. The test board also >>>>connects to a DVM and a scope and a counter for production test and >>>>cal. Muxes on the test board are controlled by the Pi400. >>> >>>Good idea, a test board, I killed one raspi by shorting an I/O pin >>>Some buffers on the test board may prevent that. >> >> >>I have posted some of these in engineering and test: >> >>https://www.dropbox.com/s/8oefk1v8avr6l7a/Probe_Slips.jpg?raw=1 > >So true..PS, as to the interface with the raspberry: My PIC programmer normally runs from the PC par port. So to run it from a raspberry I used this adaptor cable: https://panteltje.nl/pub/raspberry_pi_interface_to_pic_programmer_IXIMG_1345.JPG In the black box sits the buffer: https://panteltje.nl/pub/raspberry_pi_interface_to_pic_programmer_circuit_diagram_IXIMG_1343.JPG old style circuit diagram :-) So now it works both on a raspberry and on a PC parport. The danger the with raspberry GPIO connector is the +5 V pin and the +3.3 V pin next to it, easy to accidently short and that will kill the chip.
