3 Feb
2021
3 Feb
'21
6:53 a.m.
Den ons 3 feb. 2021 kl 15:07 skrev Paul Koning via cctalk <
cctalk at classiccmp.org>:
there
The Pico is quite different. They use their own chip for the Pico, the
RP2040. There is a 637 page manual
https://datasheets.raspberrypi.org/rp2040/rp2040-datasheet.pdf
Unlike the other Rpi this is more like the STM32 chips where you develop
C/C++ or Python to run directly on the bare metal. No Linux involved.
The early Rpi used Broadcom chips. And like most Broadcom stuff you almost
needed signing a NDA to get a glance of the pinout of the chip.
On Feb 3, 2021, at 2:51 AM, Peter Corlett via
cctalk <
cctalk at classiccmp.org> wrote:
On Tue, Feb 02, 2021 at 09:20:01AM -0800, Chuck Guzis via cctalk wrote:
[...]
> When I last proposed the STM32F407, I was met with "Oh, but the Blue
Pill
> is cheaper". Okay, use the Blue Pill,
but my code won't work with it.
Not
once has
anyone contacted me and said "I'd like to try my hand at doing
this, what can you tell me?". I've described the methodology of using an
MCU elsewhere several times.
I have a pile of Blue Pill boards, and using it to read floppies was an
obvious application. However after running the numbers, it turned out isn't enough RAM to buffer an entire track
from a HD floppy. It also has
a
broken USB implementation just to liven things up
a bit.
The Raspberry Pi Pico has a similar price to the Blue Pill and seems a
much
better machine for this task, although I
haven't combed through its
reference manual yet.
I haven't used RPi at all, since when I looked at it some years ago the
SOC technical information was secret. Contrast the BeagleBone, for which
there is a 5000 page manual.
In any case, for work like this an Ardiuno might be sufficient and quite
possibly easier to use. I've used the ARM based Arduinos, they have quite
a lot more memory, faster execution, and native USB. In fact (if you
should need it for something else) host side USB, not just device side.
The Adafruit "Trinket" is great for cases where not much I/O is needed;
there are a variety of others that have a dozen or so I/O connections, all
for $10 or thereabouts.
paul