update

main/heating_plate.c

@@ -10,6 +10,16 @@
  */
 
 #include "heating_plate.h"
+#include "driver/ledc.h"
+#include "esp_err.h"
+
+#define LEDC_TIMER LEDC_TIMER_0         //
+#define LEDC_MODE LEDC_LOW_SPEED_MODE   //
+#define LEDC_OUTPUT_IO (20)             // Define the output GPIO
+#define LEDC_CHANNEL LEDC_CHANNEL_0     //
+#define LEDC_DUTY_RES LEDC_TIMER_13_BIT // Set duty resolution to 13 bits
+#define LEDC_DUTY (4095)                // Set duty to 50%. ((2 ** 13) - 1) * 50% = 4095
+#define LEDC_FREQUENCY (5000)           // Frequency in Hertz. Set frequency at 5 kHz
 
 #define heating_plate_target_temp 48.0
 #define heating_plate_variable_temperature_range 0.5
@@ -20,13 +30,38 @@ static get_temp_callback_t get_temp_cb_s;
 void T_heating_plate_init(heating_plate_structer_t *heating_plate_structer)
 {
     heating_plate_structer_s = heating_plate_structer;
+    // Prepare and then apply the LEDC PWM timer configuration
+    ledc_timer_config_t ledc_timer = {
+        .speed_mode = LEDC_MODE,
+        .timer_num = LEDC_TIMER,
+        .duty_resolution = LEDC_DUTY_RES,
+        .freq_hz = LEDC_FREQUENCY, // Set output frequency at 5 kHz
+        .clk_cfg = LEDC_AUTO_CLK};
+    ESP_ERROR_CHECK(ledc_timer_config(&ledc_timer));
+
+    // Prepare and then apply the LEDC PWM channel configuration
+    ledc_channel_config_t ledc_channel = {
+        .speed_mode = LEDC_MODE,
+        .channel = LEDC_CHANNEL,
+        .timer_sel = LEDC_TIMER,
+        .intr_type = LEDC_INTR_DISABLE,
+        .gpio_num = LEDC_OUTPUT_IO,
+        .duty = 0, // Set duty to 0%
+        .hpoint = 0};
+    ESP_ERROR_CHECK(ledc_channel_config(&ledc_channel));
 }
 
 void T_heating_plate_registered_cb(get_temp_callback_t cb) { get_temp_cb_s = cb; }
 
-void T_heating_plate_start(void) {}
+void T_heating_plate_start(void)
+{
+    T_heating_plate_set_and_update_duty(LEDC_DUTY);
+}
 
-void T_heating_plate_stop(void) {}
+void T_heating_plate_stop(void)
+{
+    T_heating_plate_set_and_update_duty(0);
+}
 
 void T_heating_plate_schedule(void)
 {
@@ -42,3 +77,11 @@ void T_heating_plate_schedule(void)
         }
     }
 }
+
+void T_heating_plate_set_and_update_duty(uint32_t duty)
+{
+    // Set duty
+    ESP_ERROR_CHECK(ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, duty));
+    // Update duty to apply the new value
+    ESP_ERROR_CHECK(ledc_update_duty(LEDC_MODE, LEDC_CHANNEL));
+}

main/heating_plate.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <stdbool.h>
+#include <stdint.h>
 
 typedef struct
 {
@@ -14,3 +15,4 @@ void T_heating_plate_registered_cb(get_temp_callback_t cb);
 void T_heating_plate_start(void);
 void T_heating_plate_stop(void);
 void T_heating_plate_schedule(void);
+void T_heating_plate_set_and_update_duty(uint32_t duty);