Reading PWM using MCPWM

[MoRoKo]

I'd like to read PWM signal using MCPWM. When I compiled the program on VSC, there was an error about passing incompatible pointer type of the first parameter to mcpwm_new_capture_channel() which is a handle to a capture timer. Need help please

Error:
E:/Users/Me/Documents/ESP-IDF/Projects/test_readPWM/main/mymain.c: In function 'app_main':
E:/Users/Me/Documents/ESP-IDF/Projects/test_readPWM/main/mymain.c:44:47: error: passing argument 1 of 'mcpwm_new_capture_channel' from incompatible pointer type [-Wincompatible-pointer-types]
54 | ESP_ERROR_CHECK(mcpwm_new_capture_channel(timer, &cap_config, &cap_channel));
| ^~~~
| |
| mcpwm_timer_handle_t {aka
struct mcpwm_timer_t *}

Here is my code:

Code: [Select all] [Expand/Collapse]

1. #include "freertos/FreeRTOS.h"
2. #include "freertos/task.h"
3. #include "driver/mcpwm_prelude.h"
4. #include "esp_timer.h"
5. #include "esp_log.h"
6. //#include "driver/mcpwm.h"
7.  
8. // Constants
9. #define GPIO_INPUT_CAPTURE_PIN 18   // GPIO pin connected to the sensor
10.  
11. // Globals
12. static const char *TAG = "Test_Read_PWM";
13. volatile float read_capture_time = 0;           // store time of reading
14.  
15. // ISR Handler for Pulse Capture
16. bool IRAM_ATTR mcpwm_capture_isr_handler(mcpwm_cap_channel_handle_t cap_channel, const mcpwm_capture_event_data_t *edata, void *user_data) {
17.     read_capture_time = edata->cap_value;
18.  
19.     return false; // No further actions required by the ISR
20. }
21.  
22. // Main Application
23. void app_main(void) {
24.    
25.  
26.     // Configure MCPWM for input capture
27.     // Initialize MCPWM timer
28.     mcpwm_timer_config_t timer_config = {
29.         .group_id = 0,                         // MCPWM Group 0
30.         .clk_src = MCPWM_TIMER_CLK_SRC_DEFAULT, // Default clock source
31.         .resolution_hz = 1000000,              // 1 MHz resolution (1 µs ticks)
32.         .count_mode = MCPWM_TIMER_COUNT_MODE_UP
33.     };
34.     mcpwm_timer_handle_t timer = NULL;
35.     ESP_ERROR_CHECK(mcpwm_new_timer(&timer_config, &timer));
36.  
37.     // Initialize capture channel
38.     mcpwm_capture_channel_config_t cap_config = {
39.         .gpio_num = GPIO_INPUT_CAPTURE_PIN,
40.         .prescale = 1,
41.         .flags.pos_edge = true, // Capture on rising edge
42.         .flags.neg_edge = false,
43.     };
44.     mcpwm_cap_channel_handle_t cap_channel = NULL;
45.     ESP_ERROR_CHECK(mcpwm_new_capture_channel(timer, &cap_config, &cap_channel));
46.  
47.     // Register the ISR handler for capture events
48.     mcpwm_capture_event_callbacks_t callbacks = {
49.         .on_cap = mcpwm_capture_isr_handler
50.     };
51.     ESP_ERROR_CHECK(mcpwm_capture_channel_register_event_callbacks(cap_channel, &callbacks, NULL));
52.  
53.     ESP_LOGI(TAG, "Enable capture channel");
54.     ESP_ERROR_CHECK(mcpwm_capture_channel_enable(cap_channel));
55.  
56.     // Enable and start MCPWM timer
57.     ESP_ERROR_CHECK(mcpwm_timer_enable(timer));
58.     ESP_ERROR_CHECK(mcpwm_timer_start_stop(timer, MCPWM_TIMER_START_NO_STOP));
59.  
60.     // Main task loop
61.     while (1) {
62.         // do something with "read_capture_time" variable below
63.         // ....
64.  
65.         vTaskDelay(pdMS_TO_TICKS(1000)); // Sleep for 1 second
66.     }
67. }

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