Search found 46 matches

by StridingDragon
Thu Sep 30, 2021 11:44 pm
Forum: ESP-IDF
Topic: Does the ESP32 have SIMD-like instructions?
Replies: 12
Views: 9704

Re: Does the ESP32 have SIMD-like instructions?

Thanks for the link. That's really interesting to see it like this.
by StridingDragon
Wed Sep 29, 2021 6:55 pm
Forum: ESP-IDF
Topic: Does the ESP32 have SIMD-like instructions?
Replies: 12
Views: 9704

Re: Does the ESP32 have SIMD-like instructions?

I finally had the chance to take a closer look at the ESP-DSP component, but all I see there are assembler implementations of functions typically used for DSPs. So, it's a DSP library but not what I was looking for. My original question was trying to find out of the ESP32 and the Xtensa chip used in...
by StridingDragon
Thu Sep 23, 2021 1:51 am
Forum: General Discussion
Topic: Decode stack traces
Replies: 3
Views: 6385

Re: Decode stack traces

The Espressif tools contain a tool called `xtensa-esp32-elf-addr2line` which will interpret the addresses for you and give you proper information about the source files, lines and function names, etc. You can feed it the entire backtrace and it will display the info for all addresses in one swoop, g...
by StridingDragon
Thu Sep 23, 2021 1:48 am
Forum: General Discussion
Topic: ESP32 write to registers
Replies: 4
Views: 3185

Re: ESP32 write to registers

You essentially have to select the SPI device you want to address and then execute a SPI transaction using something like `spi_device_transmit()` etc. Don't forget to unselect the SPI device afterwards to make it available to other processes.
by StridingDragon
Thu Sep 16, 2021 5:30 pm
Forum: General Discussion
Topic: What is the dot-product of two images?
Replies: 4
Views: 3952

Re: What is the dot-product of two images?

Interesting. Thanks, Tom. This is exciting stuff. I had not heard of SVD before, but it sounds really impressive.
by StridingDragon
Wed Sep 15, 2021 5:59 pm
Forum: General Discussion
Topic: What is the dot-product of two images?
Replies: 4
Views: 3952

Re: What is the dot-product of two images?

Too bad no one seems to have an answer for this. I can see the implementation of it (https://github.com/espressif/esp-dsp/tree/master/modules/dotprod) and all it does is multiply pixels with each other and summing the products up as the return value. Not sure for what purpose this operation could be...
by StridingDragon
Fri Sep 10, 2021 12:56 am
Forum: General Discussion
Topic: [resolved] need development boards ASAP (USA)
Replies: 10
Views: 5736

Re: need development boards ASAP (USA)

Ooof! I had no idea.
by StridingDragon
Thu Sep 09, 2021 11:18 pm
Forum: General Discussion
Topic: [resolved] need development boards ASAP (USA)
Replies: 10
Views: 5736

Re: need development boards ASAP (USA)

How about just grabbing some ESP32-WROVER board from Amazon? You could have that overnight, depending on where you are.
by StridingDragon
Thu Sep 09, 2021 5:53 pm
Forum: General Discussion
Topic: What is the dot-product of two images?
Replies: 4
Views: 3952

What is the dot-product of two images?

While looking through the ESP32 DSP documentation (https://docs.espressif.com/projects/esp-dsp/en/latest/esp-dsp-benchmarks.html) I stumbled across functions that reportedly create the "dotproduct of two images"—no other information is provided. I have never heard of a dot-product of two images in a...
by StridingDragon
Sat Sep 04, 2021 7:03 pm
Forum: ESP-IDF
Topic: Does the ESP32 have SIMD-like instructions?
Replies: 12
Views: 9704

Re: Does the ESP32 have SIMD-like instructions?

Thanks for the info, but I am not sure. Does any of this apply to the WROVER B?