LEDC: improved support for ESP32-C3 and refactored divisor calculation

As ESP32C3 does not have support for REF_TICK source clock, it is now not
possible to select it anymore.
Auto cfg clock has been improved for all boards.

components/driver/include/driver/ledc.h

@@ -16,10 +16,43 @@
 extern "C" {
 #endif
 
-#define LEDC_APB_CLK_HZ  (APB_CLK_FREQ)
-#define LEDC_REF_CLK_HZ  (REF_CLK_FREQ)
-#define LEDC_ERR_DUTY    (0xFFFFFFFF)
-#define LEDC_ERR_VAL     (-1)
+#define LEDC_APB_CLK_HZ         (APB_CLK_FREQ)
+#define LEDC_REF_CLK_HZ         (REF_CLK_FREQ)
+#define LEDC_ERR_DUTY           (0xFFFFFFFF)
+#define LEDC_ERR_VAL            (-1)
+
+/**
+ * @brief Configuration parameters of LEDC channel for ledc_channel_config function
+ */
+typedef struct {
+    int gpio_num;                   /*!< the LEDC output gpio_num, if you want to use gpio16, gpio_num = 16 */
+    ledc_mode_t speed_mode;         /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
+    ledc_channel_t channel;         /*!< LEDC channel (0 - 7) */
+    ledc_intr_type_t intr_type;     /*!< configure interrupt, Fade interrupt enable  or Fade interrupt disable */
+    ledc_timer_t timer_sel;         /*!< Select the timer source of channel (0 - 3) */
+    uint32_t duty;                  /*!< LEDC channel duty, the range of duty setting is [0, (2**duty_resolution)] */
+    int hpoint;                     /*!< LEDC channel hpoint value, the max value is 0xfffff */
+    struct {
+        unsigned int output_invert: 1;/*!< Enable (1) or disable (0) gpio output invert */
+    } flags;                        /*!< LEDC flags */
+
+} ledc_channel_config_t;
+
+/**
+ * @brief Configuration parameters of LEDC Timer timer for ledc_timer_config function
+ */
+typedef struct {
+    ledc_mode_t speed_mode;                /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
+    union {
+        ledc_timer_bit_t duty_resolution;  /*!< LEDC channel duty resolution */
+        ledc_timer_bit_t bit_num __attribute__((deprecated)); /*!< Deprecated in ESP-IDF 3.0. This is an alias to 'duty_resolution' for backward compatibility with ESP-IDF 2.1 */
+    };
+    ledc_timer_t  timer_num;               /*!< The timer source of channel (0 - 3) */
+    uint32_t freq_hz;                      /*!< LEDC timer frequency (Hz) */
+    ledc_clk_cfg_t clk_cfg;                /*!< Configure LEDC source clock.
+                                                For low speed channels and high speed channels, you can specify the source clock using LEDC_USE_REF_TICK, LEDC_USE_APB_CLK or LEDC_AUTO_CLK.
+                                                For low speed channels, you can also specify the source clock using LEDC_USE_RTC8M_CLK, in this case, all low speed channel's source clock must be RTC8M_CLK*/
+} ledc_timer_config_t;
 
 typedef intr_handle_t ledc_isr_handle_t;