fix(ledc): Apply suggestions from code review

Co-authored-by: Rodrigo Garcia <rodrigo.garcia@espressif.com>

cores/esp32/esp32-hal-ledc.c

@@ -64,9 +64,12 @@ bool ledcAttachChannel(uint8_t pin, uint32_t freq, uint8_t resolution, uint8_t c
         log_e("Channel %u is not available (maximum %u) or already used!", channel, LEDC_CHANNELS);
         return false;
     }
-
-    if (resolution > LEDC_MAX_BIT_WIDTH){
-        log_e("LEDC resolution too big (maximum %u)", LEDC_MAX_BIT_WIDTH);
+    if (freq == 0) {
+        log_e("LEDC pin %u - frequency can't be zero.", pin);
+        return false;
+    }
+    if (resolution == 0 || resolution > LEDC_MAX_BIT_WIDTH){
+        log_e("LEDC pin %u - resolution is zero or it is too big (maximum %u)", pin, LEDC_MAX_BIT_WIDTH);
         return false;
     }
 

cores/esp32/esp32-hal-ledc.h

@@ -145,7 +145,7 @@ uint32_t ledcChangeFrequency(uint8_t pin, uint32_t freq, uint8_t resolution);
  * @brief Sets inverting of the output signal for a given LEDC pin.
  * 
  * @param pin GPIO pin
- * @param out_invert select, if output should be inverted (1 = inverting output).
+ * @param out_invert select, if output should be inverted (true = inverting output).
  * 
  * @return true if output inverting was successfully set, false otherwise.
  */

docs/en/api/ledc.rst

@@ -178,7 +178,7 @@ This function is used to set inverting output for the LEDC pin.
     bool ledcOutputInvert(uint8_t pin, bool out_invert);
 
 * ``pin`` select LEDC pin.
-* ``out_invert`` select, if output should be inverted (1 = inverting output).
+* ``out_invert`` select, if output should be inverted (true = inverting output).
 
 This function returns ``true`` if setting inverting output was successful.
 If ``false`` is returned, an error occurred and the inverting output was not set.