I am developing an ESP32S3-based device that has to be able to host a standard USB keyboard The "usb_host_lib" example (https://github.com/espressif/esp-idf/tree/master/examples/peripherals/usb/host/usb_host_lib/main) works properly to deliver user's keystrokes to the hid host , but does not show ho...

Hi.

Indeed, the ideal would be to program directly the ESP32 components, with no intermediation of a RTOS.

To whom it may interest, a tip on ADC recalibration: I could not find a way to make function "adc_vref_to_gpio" works but I've got other solution to deal with ADC calibration: to edit "vref" field in "esp_adc_cal_characteristics_t" struct, that's the last parameter in function "esp_adc_cal_character...

Hi! I also face a problem related to "adc_vref_to_gpio" function, since it results a error at compile time, although documentation at https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-reference/peripherals/adc.html?highlight=adc_power_acquire# "adc2_vref_to_gpio" cause no compile tim...

Hi, Becorey. Your posts were useful to me since I am intending to launch products not based on a development board, although it would be a comfortable choice in some aspects. My no more existing doubt was related to code upload to an ESP32 module (probably a WROOM-32 one), but the programmer circuit...

It's needed to update title from "Random timer miscount" to "GPIO ISR improperly called", since the real cause of the "Random timer miscount" was an error on GPIO interrupt, as explained in my previous post.

Not explained yet why GPIO ISR behaves that way.

ESP_Dazz, thanx for your reply. An average 2..3 us delay is ok and I can cope with this. I need an time as exact as possible between two edges and cannot use an average, since signal frequency is variable. Initially, I intended to fully code in Assembly to get the most effective program I could sinc...

Hi, Becorey. "Are you using an interrupt function triggered by the counter pulse?" sraposo > that´s triggered by positive transition of the signal from external oscillator. "What does ".counter_en = false " do?." sraposo > That means counter will not work till a "timer_start" is called. "It's 1kHz, ...

ESP-WROOM-32 "ESP32 DEVKITV1" board Hi! I´m about to develop an application that is time-critical and demands a reasonable precision on timer count. It´s a simple code that should register how many timer counts occur between two positive edges on square wave signal. I´m using a pretty stable 1KHz sq...

*********************************************************************************************************************************** In january, 23rd 2021, title was changed from "Random timer miscount" to "GPIO ISR improperly called" Check post dated Jan 22, 2021 8:51 pm ****************************...