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pcnt: deprecated as legacy driver

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morris
2022-01-17 14:44:55 +08:00
parent ec8defaa96
commit 04b3f8b210
17 changed files with 231 additions and 398 deletions
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6
examples/peripherals/pcnt/pulse_count_event/CMakeLists.txt
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# The following lines of boilerplate have to be in your project's CMakeLists
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(pcnt_event)

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examples/peripherals/pcnt/pulse_count_event/README.md
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| Supported Targets | ESP32 | ESP32-S2 |
| ----------------- | ----- | -------- |
# Pulse Count Event Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This example uses the pulse counter module (PCNT) to count the rising edges of the PWM pulses generated by the LED Controller module (LEDC).
## How to use example
### Hardware Required
* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
* A USB cable for power supply and programming
Pin connection:
* GPIO4 is the default output GPIO of the 1 Hz pulse generator.
* GPIO18 is the default pulse input GPIO. We need to short GPIO4 and GPIO18.
* GPIO5 is the default control signal, which can be left floating with internal pull up, or connected to Ground (If GPIO5 is left floating, the value of counter increases with the rising edges of the PWM pulses. If GPIO5 is connected to Ground, the value decreases).
### Configure the project
```
idf.py menuconfig
```
### Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
```
idf.py -p PORT flash monitor
```
(To exit the serial monitor, type ``Ctrl-]``.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
## Example Output
Run this example, and you can see the following output log on the serial monitor:
(Here, GPIO5 is connected to Ground)
```
Current counter value :-1
Current counter value :-2
Current counter value :-3
Current counter value :-4
Event PCNT unit[0]; cnt: -5
THRES0 EVT
Current counter value :-5
Current counter value :-6
Current counter value :-7
Current counter value :-8
Current counter value :-9
Event PCNT unit[0]; cnt: 0
L_LIM EVT
ZERO EVT
Current counter value :0
Current counter value :-1
...
```
## Troubleshooting
* program upload failure
* Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.

2
examples/peripherals/pcnt/pulse_count_event/main/CMakeLists.txt
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idf_component_register(SRCS "pcnt_event_example_main.c"
INCLUDE_DIRS ".")

197
examples/peripherals/pcnt/pulse_count_event/main/pcnt_event_example_main.c
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/* Pulse counter module - Example
For other examples please check:
https://github.com/espressif/esp-idf/tree/master/examples
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#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"
static const char *TAG = "example";
/**
* TEST CODE BRIEF
*
* Use PCNT module to count rising edges generated by LEDC module.
*
* Functionality of GPIOs used in this example:
* - GPIO18 - output pin of a sample 1 Hz pulse generator,
* - GPIO4 - pulse input pin,
* - GPIO5 - control input pin.
*
* Load example, open a serial port to view the message printed on your screen.
*
* To do this test, you should connect GPIO18 with GPIO4.
* GPIO5 is the control signal, you can leave it floating with internal pull up,
* or connect it to ground. If left floating, the count value will be increasing.
* If you connect GPIO5 to GND, the count value will be decreasing.
*
* An interrupt will be triggered when the counter value:
* - reaches 'thresh1' or 'thresh0' value,
* - reaches 'l_lim' value or 'h_lim' value,
* - will be reset to zero.
*/
#define PCNT_H_LIM_VAL 10
#define PCNT_L_LIM_VAL -10
#define PCNT_THRESH1_VAL 5
#define PCNT_THRESH0_VAL -5
#define PCNT_INPUT_SIG_IO 4 // Pulse Input GPIO
#define PCNT_INPUT_CTRL_IO 5 // Control GPIO HIGH=count up, LOW=count down
#define LEDC_OUTPUT_IO 18 // Output GPIO of a sample 1 Hz pulse generator
QueueHandle_t pcnt_evt_queue; // A queue to handle pulse counter events
/* A sample structure to pass events from the PCNT
* interrupt handler to the main program.
*/
typedef struct {
int unit; // the PCNT unit that originated an interrupt
uint32_t status; // information on the event type that caused the interrupt
} pcnt_evt_t;
/* 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;
pcnt_evt_t evt;
evt.unit = pcnt_unit;
/* Save the PCNT event type that caused an interrupt
to pass it to the main program */
pcnt_get_event_status(pcnt_unit, &evt.status);
xQueueSendFromISR(pcnt_evt_queue, &evt, NULL);
}
/* Configure LED PWM Controller
* to output sample pulses at 1 Hz with duty of about 10%
*/
static void ledc_init(void)
{
// Prepare and then apply the LEDC PWM timer configuration
ledc_timer_config_t ledc_timer;
ledc_timer.speed_mode = LEDC_LOW_SPEED_MODE;
ledc_timer.timer_num = LEDC_TIMER_1;
ledc_timer.duty_resolution = LEDC_TIMER_10_BIT;
ledc_timer.freq_hz = 1; // set output frequency at 1 Hz
ledc_timer.clk_cfg = LEDC_AUTO_CLK;
ledc_timer_config(&ledc_timer);
// Prepare and then apply the LEDC PWM channel configuration
ledc_channel_config_t ledc_channel;
ledc_channel.speed_mode = LEDC_LOW_SPEED_MODE;
ledc_channel.channel = LEDC_CHANNEL_1;
ledc_channel.timer_sel = LEDC_TIMER_1;
ledc_channel.intr_type = LEDC_INTR_DISABLE;
ledc_channel.gpio_num = LEDC_OUTPUT_IO;
ledc_channel.duty = 100; // set duty at about 10%
ledc_channel.hpoint = 0;
ledc_channel_config(&ledc_channel);
}
/* Initialize PCNT functions:
* - configure and initialize PCNT
* - set up the input filter
* - set up the counter events to watch
*/
static void pcnt_example_init(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 = PCNT_H_LIM_VAL,
.counter_l_lim = PCNT_L_LIM_VAL,
};
/* Initialize PCNT unit */
pcnt_unit_config(&pcnt_config);
/* 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);
}
void app_main(void)
{
int pcnt_unit = PCNT_UNIT_0;
/* Initialize LEDC to generate sample pulse signal */
ledc_init();
/* Initialize PCNT event queue and PCNT functions */
pcnt_evt_queue = xQueueCreate(10, sizeof(pcnt_evt_t));
pcnt_example_init(pcnt_unit);
int16_t count = 0;
pcnt_evt_t evt;
portBASE_TYPE res;
while (1) {
/* Wait for the event information passed from PCNT's interrupt handler.
* Once received, decode the event type and print it on the serial monitor.
*/
res = xQueueReceive(pcnt_evt_queue, &evt, 1000 / portTICK_PERIOD_MS);
if (res == pdTRUE) {
pcnt_get_counter_value(pcnt_unit, &count);
ESP_LOGI(TAG, "Event PCNT unit[%d]; cnt: %d", evt.unit, count);
if (evt.status & PCNT_EVT_THRES_1) {
ESP_LOGI(TAG, "THRES1 EVT");
}
if (evt.status & PCNT_EVT_THRES_0) {
ESP_LOGI(TAG, "THRES0 EVT");
}
if (evt.status & PCNT_EVT_L_LIM) {
ESP_LOGI(TAG, "L_LIM EVT");
}
if (evt.status & PCNT_EVT_H_LIM) {
ESP_LOGI(TAG, "H_LIM EVT");
}
if (evt.status & PCNT_EVT_ZERO) {
ESP_LOGI(TAG, "ZERO EVT");
}
} else {
pcnt_get_counter_value(pcnt_unit, &count);
ESP_LOGI(TAG, "Current counter value :%d", count);
}
}
}