Search found 2225 matches

by WiFive
Fri Apr 26, 2019 5:30 am
Forum: ESP32 Arduino
Topic: ESP32 WiFi Signal Strength
Replies: 2
Views: 18

Re: ESP32 WiFi Signal Strength

Can you correlate it to thermal cycling?
by WiFive
Thu Apr 25, 2019 7:22 am
Forum: Hardware
Topic: Discrepancy between WROOM-32 and ESP Hardware design guidelines
Replies: 1
Views: 46

Re: Discrepancy between WROOM-32 and ESP Hardware design guidelines

Wroom-32 uses tapped capacitor matching but newer wroom-32d uses pi matching. Supposedly wroom-32d has better rf performance.
by WiFive
Thu Apr 25, 2019 7:14 am
Forum: General Discussion
Topic: ADC: how to configure different attenuations for channels?
Replies: 1
Views: 63

Re: ADC: how to configure different attenuations for channels?

You should do

Code: Select all

adc_chars_vref = calloc(1, sizeof(esp_adc_cal_characteristics_t));
esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars_vref);
Then you have 2 sets of chars
by WiFive
Thu Apr 25, 2019 7:07 am
Forum: General Discussion
Topic: ADC_VREF already calibrated on ESP32_WROOM_32D
Replies: 2
Views: 92

Re: ADC_VREF already calibrated on ESP32_WROOM_32D

How much do you trust your voltage meter vs factory equipment? The calibrated error is listed as +-23mV for 0dB and your readings are within this margin.
by WiFive
Thu Apr 25, 2019 12:31 am
Forum: ESP32 IDF
Topic: Wake handler GPIO/ADC examples?
Replies: 2
Views: 83

Re: Wake handler GPIO/ADC examples?

It would be nice to have a wake stub library with useful functions in rtc_wake_stub_* files but I don't think it exists yet.
by WiFive
Thu Apr 25, 2019 12:10 am
Forum: General Discussion
Topic: flash encryption (pre-generated key) procedure flow
Replies: 10
Views: 819

Re: flash encryption (pre-generated key) procedure flow

The flash encryption algorithm is AES-256, where the key is “tweaked” with the offset address of each 32 byte block of flash. This means every 32 byte block (two consecutive 16 byte AES blocks) is encrypted with a unique key derived from the flash encryption key. So yes the encrypted binary content...
by WiFive
Wed Apr 24, 2019 2:59 am
Forum: ESP32 IDF
Topic: ESP-WROOM-32 How to use Factory Firmware?
Replies: 1
Views: 57

Re: ESP-WROOM-32 How to use Factory Firmware?

It is running https://github.com/espressif/esp32-at which is meant to interface with a host over uart.

You need to reflash it to do anything interesting. If you just want to play you should flash micropython or moddable or nodemcu.

https://youtube.com/watch?v=hfS8zA9nL7I
by WiFive
Tue Apr 23, 2019 1:07 pm
Forum: General Discussion
Topic: GPIO34-36 Interrupt cause kernel panic
Replies: 2
Views: 88

Re: GPIO34-36 Interrupt cause kernel panic

All those pins have no internal pull up or pulldown so they can generate a lot of interrupts from noise.
by WiFive
Sat Apr 20, 2019 5:29 am
Forum: ESP32 IDF
Topic: Need help to overrite one of file from component into ESP32
Replies: 10
Views: 225

Re: Need help to overrite one of file from component into ESP32

How I can reset ESP32 IDF submodule

Using git commands
and Apply patch for same?
Using patch command
So, If we change anything into ESP32 IDF then it will show dirty changes
If you really want it to show clean then you should maintain your own fork of esp-idf.

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