On 22/03/2025 19:09, rbowman wrote:Ya know ..... think I'm gonna stay away from Pico's :-)On Sat, 22 Mar 2025 13:35:54 +0000, The Natural Philosopher wrote:Well it spoofs the disk obviously
>The PICO has no filesystem. IN use you hold a button down while powering>
up and it's Flash presents itself as a USB drive. You copy a special
binary file of compiled code onto that 'drive', and it reboots and runs
it..
Okay, you hold down BOOTSEL when plugging it into the USB. Then it shows
up on Files as RP2350. If you click on that you see INDEX.HTM and
INFO_UF2.TXT. If you look at Properties it reports 2 items totaling 305
bytes and 134.1 MB free.
>
df -Th /dev/sda1
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda1 vfat 128M 8.0K 128M 1% /media/xxxxx/RP2350
>
Then you can
>
cp blink.uf2 /media/xxxxx/RP2350/
>
and, lo and behold, it starts blinking and vanishes from the file system!
I'm lazy so after it blinks 20 times it calls
>
reset_usb_boot(0, 0);
>
and miraculously reappears mounted. How does it do all this without a
file system known to Ubuntu? I won't even ask why after copying the
CircuitPython uf2 it reboots mounted as CIRCUITPYTHON and you can copy .py
files directly.
>
My comment had nothing to do with the programmatic use of the flash
memory, only how the Pico presents as a mass storage device.
If I want microcontrollers, there are more traditional
straight-up boards out there. If I want microprocessors
there are the straight-up PIs and beyond.
Did use PICs for a long time ... kinda remember their
quirks and tricks. There are Pico/Nano style boards to
be had cheap that use PICs. Atmel versions also exist.
| Date | Sujet | # | Auteur | |
| 8 Apr 26 |  … |
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