HomeEnergyMeter/main/pcnt_functions.c

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/ledc.h"
#include "driver/pcnt.h"
#include "esp_attr.h"
#include "esp_log.h"
#include "config.h"

/* Decode what PCNT's unit originated an interrupt
 * and pass this information together with the event type
 * the main program using a queue.
 */
static void IRAM_ATTR pcnt_example_intr_handler(void *arg)
{
    int pcnt_unit = (int)arg;
}

/* Initialize PCNT functions:
 *  - configure and initialize PCNT
 *  - set up the input filter
 *  - set up the counter events to watch
 */
void init_pcnt_unit(int unit)
{
    /* Prepare configuration for the PCNT unit */
    pcnt_config_t pcnt_config = {
        // Set PCNT input signal and control GPIOs
        .pulse_gpio_num = PCNT_INPUT_SIG_IO,
        .ctrl_gpio_num = PCNT_INPUT_CTRL_IO,
        .channel = PCNT_CHANNEL_0,
        .unit = unit,
        // What to do on the positive / negative edge of pulse input?
        .pos_mode = PCNT_COUNT_INC,   // Count up on the positive edge
        .neg_mode = PCNT_COUNT_DIS,   // Keep the counter value on the negative edge
        // What to do when control input is low or high?
        .lctrl_mode = PCNT_MODE_REVERSE, // Reverse counting direction if low
        .hctrl_mode = PCNT_MODE_KEEP,    // Keep the primary counter mode if high
        // Set the maximum and minimum limit values to watch
        .counter_h_lim = 0,
        .counter_l_lim = 0,
    };
    /* Initialize PCNT unit */
    pcnt_unit_config(&pcnt_config);

    pcnt_event_disable(unit, PCNT_EVT_H_LIM);
    pcnt_event_disable(unit, PCNT_EVT_L_LIM);
    pcnt_event_disable(unit, PCNT_EVT_ZERO);
    pcnt_filter_disable(unit);

    //uint32_t c = p_pcnt_obj->hal.dev.hw.conf_unit[unit];


    /* Configure and enable the input filter */

    //pcnt_set_filter_value(unit, 100);
    //pcnt_filter_enable(unit);

    /* Set threshold 0 and 1 values and enable events to watch */
    //pcnt_set_event_value(unit, PCNT_EVT_THRES_1, PCNT_THRESH1_VAL);
    //pcnt_event_enable(unit, PCNT_EVT_THRES_1);
    //pcnt_set_event_value(unit, PCNT_EVT_THRES_0, PCNT_THRESH0_VAL);
    //pcnt_event_enable(unit, PCNT_EVT_THRES_0);
    /* Enable events on zero, maximum and minimum limit values */
    //pcnt_event_enable(unit, PCNT_EVT_ZERO);
    //pcnt_event_enable(unit, PCNT_EVT_H_LIM);
    //pcnt_event_enable(unit, PCNT_EVT_L_LIM);

    /* Initialize PCNT's counter */
    pcnt_counter_pause(unit);
    pcnt_counter_clear(unit);

    /* Install interrupt service and add isr callback handler */
    //pcnt_isr_service_install(0);
    //pcnt_isr_handler_add(unit, pcnt_example_intr_handler, (void *)unit);

    /* Everything is set up, now go to counting */
    pcnt_counter_resume(unit);
}