Adds Arduino Nano ESP32 support to Servo library

[markub3327]

Hi @per1234, @facchinm, @aentinger

this PR adds the support for Arduino Nano ESP32 board.

Description

This pull request adds support for the Arduino Nano ESP32 board to the Servo library. The following enhancements and changes have been made:

• Implemented platform-specific code to ensure compatibility with the ESP32 architecture, focusing on the Arduino Nano ESP32 variant.
• Added conditional compilation and relevant macros to maintain backward compatibility with other supported platforms.

Motivation and Context

The Arduino Nano ESP32 is a popular and powerful board in the Arduino ecosystem. Adding support for this board allows users to control servo motors using the familiar Servo library APIs, expanding the library’s versatility and making it accessible to a wider audience.

Testing

• Tested on Arduino Nano ESP32 with various standard servos.
• Verified that existing functionality for other platforms (e.g., AVR, ARM) remains unaffected.
• Ran all example sketches on supported platforms by GitHub Actions.

Thank you for the time you are giving to this PR.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Memory usage change @ c26437f

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:avr:mega	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:avr:nano	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:esp32:nano_nora	N/A	N/A	N/A	N/A
arduino:mbed_nano:nano33ble	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_nano:nanorp2040connect	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m7	N/A	N/A	N/A	N/A
arduino:mbed_portenta:envie_m7:target_core=cm4	N/A	N/A	N/A	N/A
arduino:megaavr:nona4809	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:sam:arduino_due_x_dbg	0 - 0	0.0 - 0.0	N/A	N/A
arduino:samd:mkrzero	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Knob flash	%	examples/Knob RAM for global variables	%	examples/Sweep flash	%	examples/Sweep RAM for global variables	%
arduino:avr:leonardo	0	0.0	0	0.0	0	0.0	0	0.0
arduino:avr:mega	0	0.0	0	0.0	0	0.0	0	0.0
arduino:avr:nano	0	0.0	0	0.0	0	0.0	0	0.0
arduino:esp32:nano_nora	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
arduino:mbed_nano:nano33ble	0	0.0	0	0.0	0	0.0	0	0.0
arduino:mbed_nano:nanorp2040connect	0	0.0	0	0.0	0	0.0	0	0.0
arduino:mbed_portenta:envie_m7	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
arduino:mbed_portenta:envie_m7:target_core=cm4	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
arduino:megaavr:nona4809	0	0.0	0	0.0	0	0.0	0	0.0
arduino:sam:arduino_due_x_dbg	0	0.0	N/A	N/A	0	0.0	N/A	N/A
arduino:samd:mkrzero	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,examples/Knob<br>flash,%,examples/Knob<br>RAM for global variables,%,examples/Sweep<br>flash,%,examples/Sweep<br>RAM for global variables,%
arduino:avr:leonardo,0,0.0,0,0.0,0,0.0,0,0.0
arduino:avr:mega,0,0.0,0,0.0,0,0.0,0,0.0
arduino:avr:nano,0,0.0,0,0.0,0,0.0,0,0.0
arduino:esp32:nano_nora,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A
arduino:mbed_nano:nano33ble,0,0.0,0,0.0,0,0.0,0,0.0
arduino:mbed_nano:nanorp2040connect,0,0.0,0,0.0,0,0.0,0,0.0
arduino:mbed_portenta:envie_m7,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A
arduino:mbed_portenta:envie_m7:target_core=cm4,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A
arduino:megaavr:nona4809,0,0.0,0,0.0,0,0.0,0,0.0
arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A,0,0.0,N/A,N/A
arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0

[aentinger]

Ciao @markub3327 ☕ 👋

I no longer work for Arduino and gone is my commit access 😉

[markub3327]

@aentinger Thank you for information.

[zachwelch]

Thank you for this PR! I managed to get this working on a Seeed Studio XIAO ESP32S3 board, but it required some minor modifications to chase changes in the ledc APIs made between ESP-IDF v4.x and v5.x. Happily, my changes should allow this library to work with both v4.x and v5.x.

I have pushed my changes to the ztw/esp32 branch in my fork: https://github.com/zachwelch/Servo/tree/ztw/esp32
@markub3327 If you have time, please test my changes and, if they still work on 4.x (and otherwise meet with your approval), feel free to stack them on top of your branch here.

[gbr1]

LGTM, I tested on my Nano ESP32 with a MF90 servo

[markub3327]

@gbr1. Thank you for testing I apply this changes