ESP32-S31 • Hacker News Board

Re: ESP32-S31

#21

Post by [deleted] » Wed, Jun 03, 2026, 5:10 PM UTC

cassepipe wrote: post #7

randomint64 wrote: post #3

Espressif is on fire! And the CPU even has SIMD instructions! RISC-V cores is a big deal for embedded systems because now compiling for SoCs is only a matter of `rustup target add riscv32imac-unknown-none-elf` instead of downloading half-broken proprietary toolchains and SDKs. Take a look at https://kerkour.com/introduction-to-embedded-development-wit... and https://kerkour.com/rust-esp32-pentest to get started with…

Curious: What does the "imac" stand for in the architecture target name ?

[deleted]

Re: ESP32-S31

#22

Post by tetris11 » Wed, Jun 03, 2026, 5:10 PM UTC

Aurornis wrote: post #6

Good to have WiFi and wired ethernet on the same part again. Although we lost the MIPI support that the P4 dual-core RISC-V line has.

How does wired internet technically work on these chips? Is it just 8 dedicated GPIO pins?

Re: ESP32-S31

#23

Post by tliltocatl » Wed, Jun 03, 2026, 5:12 PM UTC

skybrian wrote: post #10

I'm interested in audio out because I dabble in musical instruments. What's the state of Bluetooth audio out on microcontrollers? Is low latency and high quality output possible?

Is there any reason you want wireless? Bluetooth audio is a disaster, AFAIK. You don't want to use it for music. Just go wired, the ether is too cramped already.

Re: ESP32-S31

#24

Post by oritron » Wed, Jun 03, 2026, 5:13 PM UTC

skybrian wrote: post #10

I'm interested in audio out because I dabble in musical instruments. What's the state of Bluetooth audio out on microcontrollers? Is low latency and high quality output possible?

Low latency in Bluetooth audio comes down to codecs and the best are proprietary.

If you want to really cut down latency and need wireless with hardware like this, you could use a second ESP32 and send your own bitstream between them.

Re: ESP32-S31

#25

Post by nubinetwork » Wed, Jun 03, 2026, 5:14 PM UTC

This looks like a nucleo144, except its risc-v... but why would I use it over said nucleo144?

Re: ESP32-S31

#26

Post by hart_russell » Wed, Jun 03, 2026, 5:15 PM UTC

Any reason why this device wouldn't have Z-Wave? Is the wireless protocol significantly different than Thread and Zigbee?

Re: ESP32-S31

#27

Post by Havoc » Wed, Jun 03, 2026, 5:16 PM UTC

randomint64 wrote: post #3

Espressif is on fire! And the CPU even has SIMD instructions! RISC-V cores is a big deal for embedded systems because now compiling for SoCs is only a matter of `rustup target add riscv32imac-unknown-none-elf` instead of downloading half-broken proprietary toolchains and SDKs. Take a look at https://kerkour.com/introduction-to-embedded-development-wit... and https://kerkour.com/rust-esp32-pentest to get started with…

Nice. Been meaning to try rust on these sort of devices but the riscv I saw thus far seemed to be mixed arm and riscv which seemed weird

Re: ESP32-S31

#28

Post by polpo » Wed, Jun 03, 2026, 5:17 PM UTC

phkahler wrote: post #13

randomint64 wrote: post #3

Espressif is on fire! And the CPU even has SIMD instructions! RISC-V cores is a big deal for embedded systems because now compiling for SoCs is only a matter of `rustup target add riscv32imac-unknown-none-elf` instead of downloading half-broken proprietary toolchains and SDKs. Take a look at https://kerkour.com/introduction-to-embedded-development-wit... and https://kerkour.com/rust-esp32-pentest to get started with…

>> And the CPU even has SIMD instructions! Yes, but it looks like there is no hardware floating point. The description of the CORDIC module indicates fixed-point calculations, which is consistent with the lack of any reference to floating point. I am happy the have CAN-FD and Motor PWM module, but nowhere did I see conversion times listed for the ADC. For motor control I demand 1uS conversion time or less, and in the…

From the ESP32-S31 datasheet: "Single-precision floating-point unit (FPU) per core"

Re: ESP32-S31

#29

Post by Aurornis » Wed, Jun 03, 2026, 5:18 PM UTC

hart_russell wrote: post #26

Any reason why this device wouldn't have Z-Wave? Is the wireless protocol significantly different than Thread and Zigbee?

This device only has a 2.4GHz radio. Z-Wave is sub-1GHz.

Re: ESP32-S31

#30

Post by bobmcnamara » Wed, Jun 03, 2026, 5:19 PM UTC

tosh wrote: post #9

randomint64 wrote: post #3

Espressif is on fire! And the CPU even has SIMD instructions! RISC-V cores is a big deal for embedded systems because now compiling for SoCs is only a matter of `rustup target add riscv32imac-unknown-none-elf` instead of downloading half-broken proprietary toolchains and SDKs. Take a look at https://kerkour.com/introduction-to-embedded-development-wit... and https://kerkour.com/rust-esp32-pentest to get started with…

very interesting, do you have a pointer with more info on what kind of SIMD support it has?

Hopefully comparable or better than ESP32S3.

But with the weird alignment thing fixed