From 01c8cae0dcf59267e856ea5734ca7ed4bc259278 Mon Sep 17 00:00:00 2001
From: Richard Strassheim <49469623+iTacco@users.noreply.github.com>
Date: Sat, 17 Apr 2021 01:06:58 +0200
Subject: [PATCH] Added method to change the ledc PWM frequency
 programmatically (#5003)

Added method to change the ledc PWM frequence programmatically
Returning frequency from ledcChangeFrequency
---
 cores/esp32/esp32-hal-ledc.c | 9 +++++++++
 cores/esp32/esp32-hal-ledc.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/cores/esp32/esp32-hal-ledc.c b/cores/esp32/esp32-hal-ledc.c
index e755f064..5881b400 100644
--- a/cores/esp32/esp32-hal-ledc.c
+++ b/cores/esp32/esp32-hal-ledc.c
@@ -318,3 +318,12 @@ void ledcDetachPin(uint8_t pin)
 {
     pinMatrixOutDetach(pin, false, false);
 }
+
+double ledcChangeFrequency(uint8_t chan, double freq, uint8_t bit_num)
+{
+    if (chan > 15) {
+        return 0;
+    }
+    double res_freq = _ledcSetupTimerFreq(chan, freq, bit_num);
+    return res_freq;
+}
diff --git a/cores/esp32/esp32-hal-ledc.h b/cores/esp32/esp32-hal-ledc.h
index 159f98d5..1d640b32 100644
--- a/cores/esp32/esp32-hal-ledc.h
+++ b/cores/esp32/esp32-hal-ledc.h
@@ -35,6 +35,7 @@ uint32_t    ledcRead(uint8_t channel);
 double      ledcReadFreq(uint8_t channel);
 void        ledcAttachPin(uint8_t pin, uint8_t channel);
 void        ledcDetachPin(uint8_t pin);
+double      ledcChangeFrequency(uint8_t channel, double freq, uint8_t resolution_bits);
 
 
 #ifdef __cplusplus