From 85ea4e995a75abe061f6fc375ea0481084dddd43 Mon Sep 17 00:00:00 2001
From: schererleander <leander@schererleander.de>
Date: Tue, 20 Jan 2026 08:34:54 +0100
Subject: initial commit

---
 libraries/ESP32Servo/src/ESP32PWM.h | 150 ++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 libraries/ESP32Servo/src/ESP32PWM.h

(limited to 'libraries/ESP32Servo/src/ESP32PWM.h')

diff --git a/libraries/ESP32Servo/src/ESP32PWM.h b/libraries/ESP32Servo/src/ESP32PWM.h
new file mode 100644
index 0000000..581a244
--- /dev/null
+++ b/libraries/ESP32Servo/src/ESP32PWM.h
@@ -0,0 +1,150 @@
+/*
+ * ESP32PWM.h
+ *
+ *  Created on: Sep 22, 2018
+ *      Author: hephaestus
+ */
+
+#ifndef LIBRARIES_ESP32SERVO_SRC_ESP32PWM_H_
+#define LIBRARIES_ESP32SERVO_SRC_ESP32PWM_H_
+#include "esp32-hal-ledc.h"
+#if defined(ARDUINO)
+	#include "Arduino.h"
+#endif
+
+#if defined(CONFIG_IDF_TARGET_ESP32C3)
+#define NUM_PWM 6
+#elif defined(CONFIG_IDF_TARGET_ESP32S2)   ||  defined(CONFIG_IDF_TARGET_ESP32S3)
+#define NUM_PWM 8
+#else 
+#define NUM_PWM 16
+#endif
+
+#define PWM_BASE_INDEX 0
+#define USABLE_ESP32_PWM (NUM_PWM-PWM_BASE_INDEX)
+#include <cstdint>
+
+class ESP32PWM {
+private:
+
+	void attach(int pin);
+	int pwmChannel = 0;                         // channel number for this servo
+	bool attachedState = false;
+	int pin;
+	uint8_t resolutionBits;
+	double myFreq;
+	int allocatenext(double freq);
+
+	static double _ledcSetupTimerFreq(uint8_t pin, double freq,
+			uint8_t bit_num);
+
+	bool checkFrequencyForSideEffects(double freq);
+
+	void adjustFrequencyLocal(double freq, double dutyScaled);
+	static double mapf(double x, double in_min, double in_max, double out_min,
+			double out_max) {
+		if(x>in_max)
+			return out_max;
+		if(x<in_min)
+			return out_min;
+		return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+	}
+
+	double setup(double freq, uint8_t resolution_bits=10);
+	//channel 0-15 resolution 1-16bits freq limits depend on resolution9
+	void attachPin(uint8_t pin);
+	// pin allocation
+	void deallocate();
+public:
+	// setup
+	ESP32PWM();
+	virtual ~ESP32PWM();
+
+
+	void detachPin(int pin);
+	void attachPin(uint8_t pin, double freq, uint8_t resolution_bits=10);
+	bool attached() {
+		return attachedState;
+	}
+
+	// write raw duty cycle
+	void write(uint32_t duty);
+	// Write a duty cycle to the PWM using a unit vector from 0.0-1.0
+	void writeScaled(double duty);
+	//Adjust frequency
+	double writeTone(double freq);
+	double writeNote(note_t note, uint8_t octave);
+	void adjustFrequency(double freq, double dutyScaled=-1);
+
+	// Read pwm data
+	uint32_t read();
+	double readFreq();
+	double getDutyScaled();
+
+	//Timer data
+	static int timerAndIndexToChannel(int timer, int index);
+	/**
+	 * allocateTimer
+	 * @param a timer number 0-3 indicating which timer to allocate in this library
+	 * Switch to explicate allocation mode
+	 *
+	 */
+	static void allocateTimer(int timerNumber);
+	static bool explicateAllocationMode;
+	int getTimer() {
+		return timerNum;
+	}
+	int timerNum = -1;
+	uint32_t myDuty = 0;
+	int getChannel();
+	static int PWMCount;              // the total number of attached pwm
+	static int timerCount[4];
+	static ESP32PWM * ChannelUsed[NUM_PWM]; // used to track whether a channel is in service
+	static long timerFreqSet[4];
+
+	// Helper functions
+	int getPin() {
+		return pin;
+	}
+	static bool hasPwm(int pin) {
+#if defined(CONFIG_IDF_TARGET_ESP32S2)
+		if ((pin >=1 && pin <= 21) || //21
+				(pin == 26) || //1
+				(pin >= 33 && pin <= 42)) //10
+#elif defined(CONFIG_IDF_TARGET_ESP32S3)
+		if ((pin >=1 && pin <= 21) || //20
+				(pin >= 35 && pin <= 45) || //11
+				(pin == 47) || (pin == 48)) //2
+#elif defined(CONFIG_IDF_TARGET_ESP32C3)
+		if ((pin >=0 && pin <= 10) || //11
+				(pin >= 18 && pin <= 21)) //4
+#elif defined(CONFIG_IDF_TARGET_ESP32C6)
+		if ((pin >=0 && pin <= 9) || //10
+				(pin >= 12 && pin <= 23)) //12
+#elif defined(CONFIG_IDF_TARGET_ESP32H2)
+		if ((pin >=0 && pin <= 5) || //6
+				(pin >= 8 && pin <= 14) || //7
+				(pin >= 22 && pin <= 27)) //6
+#else
+		if ((pin == 2) || //1
+				(pin == 4) || //1
+				(pin == 5) || //1
+				((pin >= 12) && (pin <= 19)) || //8
+				((pin >= 21) && (pin <= 23)) || //3
+				((pin >= 25) && (pin <= 27)) || //3
+				(pin == 32) || (pin == 33)) //2
+#endif
+			return true;
+		return false;
+	}
+	static int channelsRemaining() {
+		return NUM_PWM - PWMCount;
+	}
+	static boolean DISABLE_DAC;
+
+
+};
+
+ESP32PWM* pwmFactory(int pin);
+
+#endif /* LIBRARIES_ESP32SERVO_SRC_ESP32PWM_H_ */
-- 
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