Just a mention of my latest Teensy project, using (2) T4.x modules. So I started this post over here:
https://forum.pjrc.com/threads/66771-MicroMod-Beta-Testing?p=278162&posted=1#post278162
I devised my own extensible h.w. ML ecosystem. A week ago, I got my new PCBs that can mount any of Teensys (up to 3.5/4.1 size), rPi Picos, rPi-0, and miscellaneous ESP32 modules (as suits my whims), plus up to 2 Lcds, all the things I play with. The past several days, I've built up 2 of these PCBs with T4.0 and T4.1 mounted. Boards can be stacked. With the psram chips Paul sells, I can control an Arducam eventually and run some nice neural net simulations, all to eventually go on my hobby robots.
https://www.pjrc.com/store/psram.html
Of great help to me ....
KurtE kindly helped me resolve the problem with running 2 Lcds from a single Hard SPI port.
https://forum.pjrc.com/threads/67063-Soft-SPI-on-T4-x
StanfordEE talks about doing bit-banging to 150-MHz, which helped me figure how to do very fast Soft SPI.
https://forum.pjrc.com/threads/57185-Teensy-4-0-Bitbang-FAST
And KurtE's post #6 in this thread was a great help in finding out how to use the 2nd 512-KB of T4.x RAM (although not tried as yet).
https://forum.pjrc.com/threads/57269-I-can-t-seem-to-use-all-of-the-Teensy-4-0-s-memory
https://forum.pjrc.com/threads/66771-MicroMod-Beta-Testing?p=278162&posted=1#post278162
I devised my own extensible h.w. ML ecosystem. A week ago, I got my new PCBs that can mount any of Teensys (up to 3.5/4.1 size), rPi Picos, rPi-0, and miscellaneous ESP32 modules (as suits my whims), plus up to 2 Lcds, all the things I play with. The past several days, I've built up 2 of these PCBs with T4.0 and T4.1 mounted. Boards can be stacked. With the psram chips Paul sells, I can control an Arducam eventually and run some nice neural net simulations, all to eventually go on my hobby robots.
https://www.pjrc.com/store/psram.html
Of great help to me ....
KurtE kindly helped me resolve the problem with running 2 Lcds from a single Hard SPI port.
https://forum.pjrc.com/threads/67063-Soft-SPI-on-T4-x
StanfordEE talks about doing bit-banging to 150-MHz, which helped me figure how to do very fast Soft SPI.
https://forum.pjrc.com/threads/57185-Teensy-4-0-Bitbang-FAST
And KurtE's post #6 in this thread was a great help in finding out how to use the 2nd 512-KB of T4.x RAM (although not tried as yet).
https://forum.pjrc.com/threads/57269-I-can-t-seem-to-use-all-of-the-Teensy-4-0-s-memory
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