224 lines
7.4 KiB
C
224 lines
7.4 KiB
C
/* Pulse counter module - Example
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For other examples please check:
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https://github.com/espressif/esp-idf/tree/master/examples
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/portmacro.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "driver/periph_ctrl.h"
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#include "driver/ledc.h"
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#include "driver/gpio.h"
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#include "driver/pcnt.h"
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#include "esp_attr.h"
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#include "esp_log.h"
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#include "soc/gpio_sig_map.h"
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/**
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* TEST CODE BRIEF
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* Use PCNT module to count rising edges generated by LEDC module.
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* GPIO18 is used as output pin, GPIO4 is used as pulse input pin and GPIO5 is used as control input pin
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*
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* Open serial port to view the message printed on your screen
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*
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* To do this test, you should connect GPIO18 with GPIO4
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* GPIO5 is the control signal, you can leave it floating with internal pulled up, or connect it to ground.
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* If you connect gpio5 to GND ,you will found the count value decreasing.
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*
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* When counter value reaches thresh1 or thresh0 value, it will trigger interrupt.
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* When counter value reaches l_lim value or h_lim value, counter value will be reset to zero and trigger interrupt.
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*/
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#define PCNT_TEST_UNIT PCNT_UNIT_0
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#define PCNT_H_LIM_VAL (10)
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#define PCNT_L_LIM_VAL (-10)
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#define PCNT_THRESH1_VAL (5)
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#define PCNT_THRESH0_VAL (-5)
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#define PCNT_INPUT_SIG_IO (4)
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#define PCNT_INPUT_CTRL_IO (5)
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#define LEDC_OUPUT_IO (18)
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xQueueHandle pcnt_evt_queue; /*A queue to handle pulse counter event*/
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typedef struct {
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int unit; /*pulse counter unit*/
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uint32_t status; /*pulse counter internal status*/
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} pcnt_evt_t;
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void IRAM_ATTR pcnt_intr_handler(void* arg)
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{
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uint32_t intr_status = PCNT.int_st.val;
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int i;
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pcnt_evt_t evt;
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portBASE_TYPE HPTaskAwoken = pdFALSE;
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for(i = 0; i < PCNT_UNIT_MAX; i++) {
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if(intr_status & (BIT(i))) {
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evt.unit = i;
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evt.status = PCNT.status_unit[i].val;
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PCNT.int_clr.val = BIT(i);
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/*H LIM EVT*/
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if(PCNT.status_unit[i].h_lim_lat) {
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//do something
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}
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/*L LIM EVT*/
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if(PCNT.status_unit[i].l_lim_lat) {
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//do something
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}
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/*THRES0 EVT*/
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if(PCNT.status_unit[i].thres0_lat) {
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//do something
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}
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/*THRES1 EVT*/
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if(PCNT.status_unit[i].thres1_lat) {
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//do something
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}
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/*ZERO EVT*/
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if(PCNT.status_unit[i].zero_lat) {
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//do something
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}
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xQueueSendFromISR(pcnt_evt_queue, &evt, &HPTaskAwoken);
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if(HPTaskAwoken == pdTRUE) {
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portYIELD_FROM_ISR();
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}
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}
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}
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}
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static void ledc_init(void)
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{
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ledc_channel_config_t ledc_channel;
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/*use GPIO18 as output pin*/
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ledc_channel.gpio_num = LEDC_OUPUT_IO;
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/*LEDC high speed mode */
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ledc_channel.speed_mode = LEDC_HIGH_SPEED_MODE;
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/*use LEDC channel 1*/
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ledc_channel.channel = LEDC_CHANNEL_1;
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/*Disable LEDC interrupt*/
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ledc_channel.intr_type = LEDC_INTR_DISABLE;
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/*Select LEDC timer 1 */
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ledc_channel.timer_sel = LEDC_TIMER_1;
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/*Set duty 100 */
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ledc_channel.duty = 100;
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ledc_channel_config(&ledc_channel); //ledc config
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ledc_timer_config_t ledc_timer;
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/*LEDC timer high speed mode*/
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ledc_timer.speed_mode = LEDC_HIGH_SPEED_MODE;
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/*10 bit PWM*/
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ledc_timer.bit_num = LEDC_TIMER_10_BIT;
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/*Select timer 1*/
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ledc_timer.timer_num = LEDC_TIMER_1;
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/*Set frequency 1 Hz */
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ledc_timer.freq_hz = 1;
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ledc_timer_config(&ledc_timer);
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}
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static void pcnt_init(void)
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{
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pcnt_config_t pcnt_config = {
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/*Set GPIO4 as pulse input gpio */
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.pulse_gpio_num = PCNT_INPUT_SIG_IO,
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/*set gpio5 as control gpio */
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.ctrl_gpio_num = PCNT_INPUT_CTRL_IO,
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/*Choose channel 0 */
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.channel = PCNT_CHANNEL_0,
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/*Choose unit 0 */
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.unit = PCNT_TEST_UNIT,
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/*Set counter and control mode*/
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/*Counter increase for positive edge on pulse input GPIO*/
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.pos_mode = PCNT_COUNT_INC,
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/*Counter decrease for negative edge on pulse input GPIO*/
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.neg_mode = PCNT_COUNT_DIS, //keep the counter value
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/*Counter mode reverse when control input is low level*/
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.lctrl_mode = PCNT_MODE_REVERSE,
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/*Counter mode does not change when control input is high level*/
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.hctrl_mode = PCNT_MODE_KEEP, //when control signal is high,keep the primary counter mode
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/*Set maximum value for increasing counter*/
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.counter_h_lim = PCNT_H_LIM_VAL,
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/*Set minimum value for decreasing counter*/
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.counter_l_lim = PCNT_L_LIM_VAL,
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};
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/*Initialize PCNT unit */
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pcnt_unit_config(&pcnt_config);
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/*Configure input filter value*/
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pcnt_set_filter_value(PCNT_TEST_UNIT, 100);
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/*Enable input filter*/
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pcnt_filter_enable(PCNT_TEST_UNIT);
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/*Set value for watch point thresh1*/
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pcnt_set_event_value(PCNT_TEST_UNIT, PCNT_EVT_THRES_1, PCNT_THRESH1_VAL);
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/*Enable watch point event of thresh1*/
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pcnt_event_enable(PCNT_TEST_UNIT, PCNT_EVT_THRES_1);
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/*Set value for watch point thresh0*/
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pcnt_set_event_value(PCNT_TEST_UNIT, PCNT_EVT_THRES_0, PCNT_THRESH0_VAL);
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/*Enable watch point event of thresh0*/
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pcnt_event_enable(PCNT_TEST_UNIT, PCNT_EVT_THRES_0);
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/*Enable watch point event of h_lim*/
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pcnt_event_enable(PCNT_TEST_UNIT, PCNT_EVT_H_LIM);
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/*Enable watch point event of l_lim*/
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pcnt_event_enable(PCNT_TEST_UNIT, PCNT_EVT_L_LIM);
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/*Enable watch point event of zero*/
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pcnt_event_enable(PCNT_TEST_UNIT, PCNT_EVT_ZERO);
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/*Pause counter*/
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pcnt_counter_pause(PCNT_TEST_UNIT);
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/*Reset counter value*/
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pcnt_counter_clear(PCNT_TEST_UNIT);
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/*Register ISR handler*/
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pcnt_isr_register(pcnt_intr_handler, NULL, 0, NULL);
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/*Enable interrupt for PCNT unit*/
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pcnt_intr_enable(PCNT_TEST_UNIT);
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/*Resume counting*/
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pcnt_counter_resume(PCNT_TEST_UNIT);
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}
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void app_main()
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{
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/*Init LEDC for pulse input signal */
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ledc_init();
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/*Init PCNT event queue */
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pcnt_evt_queue = xQueueCreate(10, sizeof(pcnt_evt_t));
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/*Init PCNT functions*/
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pcnt_init();
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int16_t count = 0;
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pcnt_evt_t evt;
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portBASE_TYPE res;
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while(1)
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{
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res = xQueueReceive(pcnt_evt_queue, &evt, 1000 / portTICK_PERIOD_MS);
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if(res == pdTRUE) {
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pcnt_get_counter_value(PCNT_TEST_UNIT, &count);
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printf("Event PCNT unit[%d]; cnt: %d\n", evt.unit, count);
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if(evt.status & PCNT_STATUS_THRES1_M) {
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printf("THRES1 EVT\n");
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}
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if(evt.status & PCNT_STATUS_THRES0_M) {
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printf("THRES0 EVT\n");
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}
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if(evt.status & PCNT_STATUS_L_LIM_M) {
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printf("L_LIM EVT\n");
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}
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if(evt.status & PCNT_STATUS_H_LIM_M) {
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printf("H_LIM EVT\n");
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}
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if(evt.status & PCNT_STATUS_ZERO_M) {
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printf("ZERO EVT\n");
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}
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} else {
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pcnt_get_counter_value(PCNT_TEST_UNIT, &count);
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printf("Current counter value :%d\n", count);
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}
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}
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}
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