ESP32 Forum

Posted: **Tue Aug 29, 2017 7:51 am**

Friends,
I would like to use pulse counting on ESP32 in Arduino IDE. Unfortunately, IDF offers a lot of functions for working with counter, I don't know, how to use it in Arduino IDE. Honestly, I'm using Platform IO, but nevermind...

Arduino IDE doesn't know "pcnt" functions, like
pcnt_unit_config(pcnt_config_t *pcnt_config).

Maybe I'm doing something wrong, maybe I don't see any hints...

Could you help me and describe, how to use pulse counter ESP32 hardware in Arduino IDE ?

Thanks,
Ondrej

Posted: **Thu May 28, 2020 7:55 pm**

The below code compiles for me in Arduino IDE (1.8.12 as of May 2020). I did use Sketch -> Include Library to add ESP32 library.

In Windows 10, Arduino installs its libraries in the user folder documents. pcnt.h is in the folder:

Code: Select all

Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.2\tools\sdk\include\driver\driver

Although this compiles, I'm now on the quest to get the PCNT to work.

Code: Untitled.cpp Select all


#include "driver/pcnt.h"

pcnt_config_t pcnt_config = {

		.pulse_gpio_num = 2,			// set gpio for pulse input gpio

		.ctrl_gpio_num = -1,			// no gpio for control

		.lctrl_mode = PCNT_MODE_KEEP,	// when control signal is low, keep the primary counter mode

		.hctrl_mode = PCNT_MODE_KEEP,	// when control signal is high, keep the primary counter mode

		.pos_mode = PCNT_COUNT_INC,		// increment the counter on positive edge

		.neg_mode = PCNT_COUNT_DIS,		// do nothing on falling edge

		.counter_h_lim = 2500,

		.counter_l_lim = 0,

		.unit = PCNT_UNIT_0,               /*!< PCNT unit number */

	    .channel = PCNT_CHANNEL_0

	};

pcnt_isr_handle_t user_isr_handle = NULL; //user's ISR service handle



void setup() {

	pcnt_unit_config(&pcnt_config);        //init unit

	pcnt_set_filter_value(PCNT_UNIT_0, test_count);

	pcnt_filter_enable(PCNT_UNIT_0);

	/* Register ISR handler and enable interrupts for PCNT unit */

	pcnt_isr_register(pcnt_intr_handler, NULL, 0, &user_isr_handle);

	pcnt_intr_enable(PCNT_UNIT_0);



	/* Everything is set up, now go to counting */

	pcnt_counter_resume(PCNT_UNIT_0);

}

ESP32 Forum

Pulse counter / totalizer usage - PCNT supporting functions

Pulse counter / totalizer usage - PCNT supporting functions

Re: Pulse counter / totalizer usage - PCNT supporting functions