Search found 70 matches

by michprev
Sat Oct 20, 2018 11:33 am
Forum: Documentation
Topic: Document Requests
Replies: 33
Views: 18894

Re: Document Requests

There are many HW bugs in ESP32 peripherals that should be mentioned in the "ECO and Workarounds for Bugs in ESP32" document. For instance: ⋅  [SPI] dummy phase does not work while using mosi phase ⋅  [SPI] CS setup time does not work in full duplex ⋅  [SPI] t...
by michprev
Sat Sep 29, 2018 10:00 am
Forum: General Discussion
Topic: Gripes on ESP32/ESP-IDF
Replies: 29
Views: 1869

Re: Gripes on ESP32/ESP-IDF

As a conclusion all of this I believe people should know following things: ⋅  ESP32 ADC is crap ⋅  GDB/OpenOCD is pretty buggy, I would not say it is usable ⋅  there are still critical bugs in ESP-IDF like this one in task scheduling ⋅  to be honest hardware d...
by michprev
Thu Sep 27, 2018 10:47 am
Forum: Hardware
Topic: GPIO invert settings
Replies: 3
Views: 240

GPIO invert settings

Hi,
is there any case when GPIO_FUNCm_IN_INV_SEL, GPIO_FUNCn_OEN_INV_SEL and GPIO_FUNCn_OUT_INV_SEL can be useful?
See TRM V3.8 pages 68 and 69.
by michprev
Wed Sep 26, 2018 7:05 pm
Forum: General Discussion
Topic: Full duplex SPI MODE 3 CS line pulls down at same time of CLK
Replies: 2
Views: 131

Re: Full duplex SPI MODE 3 CS line pulls down at same time of CLK

Generally CS should be always toggled before CLK signal. There is a hardware bug where setting cs_ena_pretrans does not have any effect in full duplex.

You can control CS line as GPIO (set it low before SPI transmission, set it high after transmission).
by michprev
Sun Sep 23, 2018 2:01 pm
Forum: Hardware
Topic: SPI flash commands on HSPI, VSPI
Replies: 1
Views: 447

Re: SPI flash commands on HSPI, VSPI

Bump. It seems like flash commands work both on HSPI and VSPI. But when using these commands what SPI configuration is ignored and what needs to be set? For example when using flash_rdsr (https://github.com/espressif/esp-idf/blob/3276a1316f66a923ee2e75b9bd5c7f1006d160f5/components/soc/esp32/include/...
by michprev
Wed Sep 19, 2018 7:05 pm
Forum: ESP32 IDF
Topic: WRITE_PERI_REG vs REG_WRITE
Replies: 0
Views: 88

WRITE_PERI_REG vs REG_WRITE

Hi,
looking into this file https://github.com/espressif/esp-idf/blob/30545f4cccec7460634b656d278782dd7151098e/components/soc/esp32/include/soc/soc.h it seems that REG_* and PERI_REG_* do the same because ETS_UNCACHED_ADDR and ETS_CACHED_ADDR does nothing. What is the idea behind it?
by michprev
Mon Sep 03, 2018 11:47 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 251
Views: 40130

Re: What would you like to see in The Next Chip?

I also wonder if it is still worth to use Xtensa architecture. Well it is cheaper, you have some experience with it and you have also already done a lot of work on it... But ⋅  Xtensa ISA is under NDA so the only thing ESP users can do is stick up with ESP-IDF and hope that some missing fe...
by michprev
Sat Sep 01, 2018 3:38 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 251
Views: 40130

Re: What would you like to see in The Next Chip?

What would you like to see in The Next Chip? I now understand why manuf. don't ask this question. I have been following this post since its creation. Very, very few good ideas, but the majority of them are people wanting to make this chip suit their own goals. Not to mention trying to throw everyth...
by michprev
Tue Aug 28, 2018 4:45 pm
Forum: Hardware
Topic: Quadcopter PCB design tips
Replies: 5
Views: 294

Re: Quadcopter PCB design tips

⋅ 1st layer traces + components ⋅ 2nd layer GND plane ⋅ 3rd layer 3.3V plane + few necessary signal traces ⋅ 4th layer GND plane ⋅ 5th layer traces + components Connect 2nd and 4th 5 layer PCBs are not standardly used :lol: and 6 layers are unnecess...
by michprev
Tue Aug 28, 2018 3:20 pm
Forum: Hardware
Topic: Quadcopter PCB design tips
Replies: 5
Views: 294

Re: Quadcopter PCB design tips

Thank you for your answer. I have also seen that ESP32 DevKitC uses AMS1117 LDO regulator. I would like to use it as well. AMS1117 datasheet recommends to use 22 uF tantalum capacitors but DevKitC uses ceramic ones. I would like to reduce noise on the power trace as much as possible. I have read tha...

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