BBS:      TELESC.NET.BR
Assunto:  Re: Baremetal programiing the Pimoroni Tiny2040 RGB LED
De:       Single Stage to Orbit
Data:     Sat, 17 Jan 2026 15:21:51 +0000
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On Mon, 2026-01-12 at 10:57 +0000, Gordon Henderson wrote:
> > like to know how to do it baremetal with ARM thumb assembly. 
> 
> ... my use is the RISC-V cores in the rp2350, so bare metal RISC-V
> asembly.... But the principle for programming the PWM generators
> is more or less the same from eith CPU, so I understand, but it's
> something I've not gotten round to.
> 
> I'd suggest to have a look at the manual and SDK and see how to do it
> from C then hand translate the C code into ASM...

I've found the following:

https://github.com/thejpster/rp-hal-rp2350-public/blob/main/rp235x-hal/exam
ples/pwm_blink.rs

Looks like this is what I've been looking for. 

The funny thing is that the Pimoroni tiny2040 that I also have has a
RGB LED on it, there's no data sheet for it but it appears to be
reversed, in that all the GPIO pins attached to this LED are all active
low, (i.e ~R GPIO18, ~B GPIO19, ~G GPIO20) so works in the opposite way
to the LED on GPIO 25 on rp2040!
-- 
Tactical Nuclear Kittens


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