Raspberry Pi Pico 2 and a new micro-controller with RISC-V and Arm?

cstanton over 1 year ago

I haven't made the jump to playing with RISC-V yet, I'm wondering what the advantages are there.

And this makes it quad-core, right?

Crazy.

I have a lot of reading to do!

Hardware Design with the RP2350 / RP2350 Datasheet / RP2350 Product Brief

Of course there's the Pico 2: Raspberry Pi Pico 2 Datasheet - I admit I haven't touched a Pico 1 yet.

What am I missing out on?

aswinvenu over 1 year ago

Wow. never knew this was coming!
I have explored both Pico and Pico w in the last few months. PIO is a nice little feature to handle gpios in a much faster CPU independent way ( BIT BANG more peripherals with out CPU )
In Pico there were 8 PIO state machines. Its been increased to 12 in pico2.

But something I dont understand is why dual core ARM or RISCV? Did I get it wrong ? What I understand is its either dual core ARM Cortex M33 or dual core Hazard3g RISCV. But why?
Why can't it be one of it? Adding two processor will consume more silicon space right?
May be It's part of their RISCV migration plan? Pico 2 is binary compatible with Pico1. May be A Pico 3 in the future with only RISCVs?!!
Anyways so happy to see RISCV getting more traction. I think its the future ahead.
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wolfgangfriedrich over 1 year ago

I got the Jackpot^-1. Yesterday my latest RP2040 prototype boards arrived. . Well, there is always a rev 2. I will still write about them once I got them up and running.
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aswinvenu over 1 year ago in reply to wolfgangfriedrich

You meant your own design? I think you can swap RP2040 with RP2350 ( I think they are pin compatible). Not sure yet. Going though the datasheet now
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Fred27 over 1 year ago

I'm surprised that they went with ARM and RISC-V - and even more so that it's actually ARM or RISC-V. I've not dug into the details yet but it seems you have to chose and only get 2 cores at a time. Can you chose 1 ARM and 1 RISC-V? I'm not sure.

Anyway, let's hope the Hazard3 doesn't have the same sort of problems that has hit the Xuantie RISC-V cores used on the Beagle-V Ahead. (These issues seem to be vendor-specific rather than a problem with RISC-V in general.)
https://www.theregister.com/2024/08/07/riscv_business_thead_c910_vulnerable/
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baldengineer over 1 year ago in reply to aswinvenu

No, they are not. The RP2040 is a QFN-44 QFN-56. The RP235x is a QFN-60 or a QFN-80.
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javagoza over 1 year ago in reply to Fred27

One no longer knows whether these failures are due to bugs or back doors.
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baldengineer over 1 year ago in reply to Fred27

Fred27 said:
Can you chose 1 ARM and 1 RISC-V? I'm not sure.

Yes, you can.

Section 3.9.2 of the chip's datasheet talks about it.

You can do it, but it may not be practical.
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baldengineer over 1 year ago

Also, the RP2350 has 5 volt tolerant I/O, when IOVDD is run at 3.3 volt.
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aswinvenu over 1 year ago in reply to baldengineer

Okay! I got confused. RP Pico and RP Pico2 are compatible! Not the SoCs. Thanks!
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aswinvenu over 1 year ago in reply to baldengineer

RP2040 is QFN-56?
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