Re: Raspberry Pi pico2 launches with an ARM and a Risc V processor core

On a sunny day (Sun, 11 Aug 2024 12:02:20 -0700) it happened John Larkin
<jjlarkin@highlandtechnology.com> wrote in
<8c2ibjh8e5ob06n15fu8hf1oh1hec9505d@4ax.com>:
 

On Sun, 11 Aug 2024 05:53:49 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
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On a sunny day (Sat, 10 Aug 2024 09:45:36 -0700) it happened John Larkin
<jjlarkin@highlandtechnology.com> wrote in
<5q5fbjpr8210i0man2rqe2349g24uaohct@4ax.com>:
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On Sat, 10 Aug 2024 09:09:22 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
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Raspberry Pi Pico 2 Launches with Arm + Risc V Cores: hands-on with the new, $5 microcontroller
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https://www.tomshardware.com/raspberry-pi/raspberry-pi-pico/raspberry-pi-pico-2-launches-with-arm-risc-v-cores-hands-on-with-the-new-dollar5-microcontroller#main
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So 2 processors for 5 $
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Comparing some features
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  Raspberry Pi Pico
SoC:  RP2040, Dual Core Arm Cortex M0+ running at up to 133 MH
SRAM: 264 K
Flash Storage: 2MB QSPI
3 x 12 bit ADC
sleep mode < 100 uA
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  Raspberry Pi Pico 2
SoC:        RP2350, Dual Core Arm Cortex M33 or Dual Core RISC-V Hazard3 running at up to 150 MHz
SRAM: 520 KB
Flash Storage: 4MB QSPI
Security: Arm TrustZone, 8KB OTP, Secure Boot
4 x 12 bit ADC
sleep mode < 10 uA
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More in the above link.

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That's amazing. The Pi stuff is incredible.
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We're designing around the RP2040 chip now. Dual-core ARM for 70
cents. It's rated at 133 MHz max, but overclocks to about 400. Some
lunatic froze one and ran the core voltage up and got it to work at 1
GHz.
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We're now designing an interposer board, to connect to a Pi 400 on one
end and to a 20-pin ribbon cable, to our DUTs, on the other, for
development and for production test both. I can post the schematic if
anyone is interested.

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I am curious to the performance of that RISC-V processor core.
I may order a Pico 2 if I see it in the webshops here (not yet it seems, just checked).
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It is strange to get a choice of CPU!
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I'd expect that at the bit-bang level, performance will be about the
same. On a 2040 ARM chip, we can bit-bang a gpio port and make a train
of 7 ns pulses, which is single cycles with a 133 Mhz clock. RiscV
can't do better than that.
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It would be cool if the floating point ops were faster, in either
mode. On a 2040, the usual single-precision things take ballpark 600
ns.
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 C compiler may make a difference, need GCC with output for that processor.
I have no idea, likely will get some development package with the right gcc.