new module

components/led/src/ledc_driver.c

@@ -0,0 +1,129 @@
+/*
+ * LEDC driver para 3 LEDs (R,G,B) controlados via ULN2003
+ */
+
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/ledc.h"
+#include "esp_err.h"
+
+#include "ledc_driver.h"
+
+// Pode ser futuramente ligado a uma opção de Kconfig.
+// Para o teu hardware (comum a 12 V via ULN2003), visto do ESP é ativo-alto.
+#define IS_ACTIVE_HIGH 1
+
+#define LEDC_LS_TIMER LEDC_TIMER_2
+#define LEDC_LS_MODE LEDC_LOW_SPEED_MODE
+
+// Canais usados: 2, 3, 4
+#define LEDC_CH_RED LEDC_CHANNEL_2
+#define LEDC_CH_GREEN LEDC_CHANNEL_3
+#define LEDC_CH_BLUE LEDC_CHANNEL_4
+
+#define LEDC_NUM_CHANNELS (3)
+#define LEDC_DUTY_RES LEDC_TIMER_13_BIT
+#define LEDC_DUTY_MAX (8192 - 1)
+#define LEDC_FREQUENCY (5000) // 5 kHz
+
+static ledc_channel_config_t ledc_channel[LEDC_NUM_CHANNELS] = {
+    {
+        .channel = LEDC_CH_RED,
+        .duty = 0,
+        .gpio_num = -1, // preenchido em runtime
+        .speed_mode = LEDC_LS_MODE,
+        .hpoint = 0,
+        .timer_sel = LEDC_LS_TIMER,
+    },
+    {
+        .channel = LEDC_CH_GREEN,
+        .duty = 0,
+        .gpio_num = -1,
+        .speed_mode = LEDC_LS_MODE,
+        .hpoint = 0,
+        .timer_sel = LEDC_LS_TIMER,
+    },
+    {
+        .channel = LEDC_CH_BLUE,
+        .duty = 0,
+        .gpio_num = -1,
+        .speed_mode = LEDC_LS_MODE,
+        .hpoint = 0,
+        .timer_sel = LEDC_LS_TIMER,
+    },
+};
+
+esp_err_t ledc_init(gpio_num_t gpio_red,
+                    gpio_num_t gpio_green,
+                    gpio_num_t gpio_blue)
+{
+    // Configuração do timer
+    ledc_timer_config_t ledc_timer = {
+        .duty_resolution = LEDC_DUTY_RES,
+        .freq_hz = LEDC_FREQUENCY,
+        .speed_mode = LEDC_LS_MODE,
+        .timer_num = LEDC_LS_TIMER,
+        .clk_cfg = LEDC_AUTO_CLK,
+    };
+
+    esp_err_t err = ledc_timer_config(&ledc_timer);
+    if (err != ESP_OK)
+    {
+        return err;
+    }
+
+    // Atribuir GPIOs aos canais
+    ledc_channel[0].gpio_num = gpio_red;
+    ledc_channel[1].gpio_num = gpio_green;
+    ledc_channel[2].gpio_num = gpio_blue;
+
+    // Configurar canais
+    for (int ch = 0; ch < LEDC_NUM_CHANNELS; ch++)
+    {
+        err = ledc_channel_config(&ledc_channel[ch]);
+        if (err != ESP_OK)
+        {
+            return err;
+        }
+    }
+
+    return ESP_OK;
+}
+
+esp_err_t ledc_set_rgb(uint32_t red, uint32_t green, uint32_t blue)
+{
+    if (red > 255)
+        red = 255;
+    if (green > 255)
+        green = 255;
+    if (blue > 255)
+        blue = 255;
+
+    red = red * LEDC_DUTY_MAX / 255;
+    green = green * LEDC_DUTY_MAX / 255;
+    blue = blue * LEDC_DUTY_MAX / 255;
+
+    if (!IS_ACTIVE_HIGH)
+    {
+        red = LEDC_DUTY_MAX - red;
+        green = LEDC_DUTY_MAX - green;
+        blue = LEDC_DUTY_MAX - blue;
+    }
+
+    ledc_set_duty(LEDC_LS_MODE, LEDC_CH_RED, red);
+    ledc_update_duty(LEDC_LS_MODE, LEDC_CH_RED);
+
+    ledc_set_duty(LEDC_LS_MODE, LEDC_CH_GREEN, green);
+    ledc_update_duty(LEDC_LS_MODE, LEDC_CH_GREEN);
+
+    ledc_set_duty(LEDC_LS_MODE, LEDC_CH_BLUE, blue);
+    ledc_update_duty(LEDC_LS_MODE, LEDC_CH_BLUE);
+
+    return ESP_OK;
+}
+
+esp_err_t ledc_clear(void)
+{
+    return ledc_set_rgb(0, 0, 0);
+}