Search found 232 matches

by krzychb
Mon Oct 22, 2018 11:09 am
Forum: ESP32 ADF
Topic: ESP32-Lyart firmware?
Replies: 2
Views: 1195

Re: ESP32-Lyart firmware?

Hi tmatsuzawa, This is an old guide and requires update to reflect audio applications recently developed by Espressif. The firmware and the method to load it to the LyraT board depends on the application you are interested in. * For Alexa like applications please check esp-avs-sdk * If you are inter...
by krzychb
Sat Oct 13, 2018 2:08 am
Forum: ESP32 IDF
Topic: Conflict between ADC2 and Wifi
Replies: 1
Views: 861

Re: Conflict between ADC2 and Wifi

And is there a guide somewhere telling precisely which GPIO, ADC ... you can use in which configuration (if possible, I would like to avoid this waste of time in the future) ? Hi Antoine, This is documented in Analog to Digital Converter section of the ESP32 Programming Guide. If you are interested...
by krzychb
Fri Oct 12, 2018 3:41 am
Forum: General Discussion
Topic: DevkitC v4 app start problem when externaly powered?
Replies: 5
Views: 1477

Re: DevkitC v4 app start problem when externaly powered?

Hi samsam and TheSub6,

Could you double check if this is not the issue described in Note on C15?

If you have C15 installed on your board then try removing it to see if this resolves the issue.

C15 has been removed ("NC" on the schematic) in the latest ESP32-DevKitC V4.
by krzychb
Sun Sep 23, 2018 10:33 am
Forum: Hardware
Topic: ESP32 DevKitC schematic files
Replies: 1
Views: 868

Re: ESP32 DevKitC schematic files

Hi Vignesh,

Please check ESP32 Modules and Boards > ESP32 DevKitC V4
by krzychb
Tue Sep 18, 2018 2:57 am
Forum: General Discussion
Topic: Using ADCs on SENSOR pads
Replies: 2
Views: 940

Re: Using ADCs on SENSOR pads

Can I just remove those caps (C84 / C90) and connect to the cap pads with my adc inputs? John A Hi John, These caps were to enable Low Noise Amplifier (LNA) functionality. The LNA is not supported anyway, so you can safely remove the caps. The cap pads are available as regulars ADC inputs. The same...
by krzychb
Mon Sep 10, 2018 9:09 pm
Forum: General Discussion
Topic: ESP32 ULP minimum wakeup time
Replies: 3
Views: 1139

Re: ESP32 ULP minimum wakeup time

Hi David, Indeed the minimum wakeup time is lower. My previous measurements were incorrect and included the program execution time. Sorry for that! I did separate check with the hardware design team and obtained more specific information. The minimum wakeup time represents clock cycles spend by ULP'...
by krzychb
Fri Sep 07, 2018 6:15 am
Forum: General Discussion
Topic: ESP32 ULP minimum wakeup time
Replies: 3
Views: 1139

Re: ESP32 ULP minimum wakeup time

Hi @dmarcos,

Good find! I see identical result. My assumption is that 160us you identified, is the time required by ULP to wake up by the timer and start running the code. I will investigate more and post here if have some new updates.
by krzychb
Fri Aug 17, 2018 6:17 pm
Forum: Hardware
Topic: What is the purpose of CAP1 CAP2 pins?
Replies: 5
Views: 1811

Re: What is the purpose of CAP1 CAP2 pins?

Hi kostyan5, Thank you for raising issue with this description and persistence to get it clarified. The "ESP32 Hardware Design Guidelines" will be updated. C5 (10 nF) that connects to CAP1 is required to suppress the noise of internal voltage reference and cannot be be removed. RC circuit between CA...
by krzychb
Thu Aug 09, 2018 6:01 pm
Forum: ESP32 IDF
Topic: How to figure LEDC max resolution?
Replies: 1
Views: 1213

Re: How to figure LEDC max resolution?

Hi Greg Corson, The max duty resolution and PWM frequency is achieved when clk_src = LEDC_APB_CLK (80 MHz). In such a case you can calculate duty resolution as: integer (log 2 (LEDC_APB_CLK / frequency)). For example, for 20kHz PWM frequency: * 80 MHz / 20 kHz = 4000 * log 2 (4000) = 11.965... * int...

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