Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

ESP32-S31

espressif.com

Post reply on HN
Print view View original

11–20 of 207 posts

Re: ESP32-S31

#11

Post by frikk »

I've been building hobby LED art projects with WLED (exclusively built on the ESP32 platform). It's been a blast. These little boards are so powerful and the open source community continues to amaze me.

My preferred controller platform is of the QuinLED line - comes with power distribution, voltage regulators, fat copper lines, configurable data-line resistors, and smart auxiliary hardware support all for an affordable $30-$50 per controller. (quinled.info)

https://kno.wled.ge/> - WLED homepage and probably my favorite clever URL of all time.

Re: ESP32-S31

#12

Post by JdeBP »

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 ?

There are a few lettered extensions to the base RV32I instruction set. e.g.:

* https://docs.riscv.org/reference/isa/unpriv/m-st-ext.html

Re: ESP32-S31

#13

Post by phkahler »

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 last year I've switched from fixed point to floating point after holding off on that switch for ~15 years.

Re: ESP32-S31

#15

Post by mentalpagefault »

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 ?

IMAC are the RISC-V extensions supported:

I = Base integer instruction set, 32-bit

M = Standard extension for integer multiplication and division

A = Standard extension for atomic instructions

C = Standard extension for compressed instructions

https://en.wikipedia.org/wiki/RISC-V#ISA_base_and_extensions

Re: ESP32-S31

#17

Post by NooneAtAll3 »

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…

where did you find cordic mention?

Re: ESP32-S31

#18

Post by oritron »

The specs look great, will see how long it takes to get these as WROOM modules or on little dev boards; my two form factors of choice for Espressif devices. I'm also curious about the pricing, so far they've impressed me with how much more you get in successive generations at a similar price.

If you're excited about the (relatively) speedy RISC-V cores and SIMD, look at the P4 which is available now. It has a slightly faster clock but no wireless: https://products.espressif.com/#/product-comparison?names=ES...

There's some cool work out there using the dsp functionality and built in image handling to crunch a lot of pixel data, which should work similarly on the S31: https://www.reddit.com/r/WLED/comments/1ry2jd7/wledmmp4_with...

Re: ESP32-S31

#19

Post by NooneAtAll3 »

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 ?

where did you find it?

Re: ESP32-S31

#20

Post by topspin »

Scene_Cast2 wrote: post #8
jeremywho wrote: post #5

When can we buy these?

The dev boards are already up for sale. I'm personally looking forward to the modules being stocked on LCSC, no idea when though.

> The dev boards are already up for sale.

I didn't expect to see that for a while yet. Not the usual Espressif announce and wait a year+ pattern.

Post reply on HN