VID6608: add hardware RMT support for Automotive gauge driver

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lib/libesp32/esp-32-vid6608-rmt/.editorconfig

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lib/libesp32/esp-32-vid6608-rmt/.gitignore

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+.pio
+.vscode
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+managed_components
+build
+sdkconfig
+dependencies.lock

lib/libesp32/esp-32-vid6608-rmt/README.md

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+# ESP-IDF library to drive Automotive gauge drivers using HW RMT driver
+
+This library implements driver for native ESP-IDF framework
+for following driver chips for analog automotive gauges (Switec X25.168, X27.168 and clones) with microstepping support:
+
+* VID6606 (2 motors)
+* VID6608 (4 motors)
+* VT6608S
+* AX1201728SG
+* BY8920
+* many others
+
+Driver chips with microstepping is the recommended way to drive such motors,
+they provide much more relailabe and smooth movement with reduced noise and
+to avoid skipping steps.
+
+This library is very similar to [Arduino-vid6608](https://github.com/petrows/arduino-vid6608),
+but it implements hardware generator for driver steps sequence,
+the [ESP-32 Remote Control Transceiver (RMT)](https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/rmt.html):
+
+* No `delay()` call;
+* Much better precision movement without interrupts and slow-downs for bi-axial instruments;
+
+Only the ESP-32 is supported. All chips has minimum 2 RMT channels.
+
+This library has following features:
+
+* More precise Datasheet complaince
+* Another smoothing method (requires less calculations)
+* Optimized homing
+* Extended API's
+
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/petrows/library/esp-32-vid6608-rmt.svg)](https://registry.platformio.org/libraries/petrows/esp-32-vid6608-rmt)
+
+## Chip documentation
+
+See [VID6606 Datasheet (English)](doc/VID6608.pdf).
+
+## Wiring
+
+This library requires that two pins (per drive) are connected to two outputs.
+
+![Datasheet scheme](doc/operation-configuration.png)
+
+* Step pin f(scx): impulse to drive motor to one microstep;
+* Direction pin CW/CCW: defines direction ov movement;
+* RESET pin: does not controlled by this library. Hold to VDD to enable function (see notes below);
+
+## RESET pin
+
+This library does not control RESET pin, please perform this inside your firmware.
+
+I have problems with some IC's, as they lost function after RESET pin manipulation. [Datasheet](doc/VID6608.pdf) recommends to hold it LOW during boot, and set to HIGH to enable operation, but i recommend just to connect to VDD to be safe.
+
+## Setting zero
+
+Motor is set to zero by moving whole scale and kept bouncing on the one of
+dead positions. This library provides optimized way to perform homing: it does
+1/2 of scale forward, then full scale backward. This helps to reduce bouncing
+like in the classical "full scale back" method.
+
+## Function documentation
+
+See inline documentation in source code: [vid6608.h](src/vid6608.h).
+
+## Compile examples
+
+To compile and flash examples, navigate to example dir and call idf:
+
+```bash
+cd examples/gauge-cal
+export IDF_TARGET=esp32c6
+idf.py flash monitor
+```
+
+## Basic example
+
+```cpp
+#include "esp32_vid6608_rmt.h"
+
+extern "C" void app_main(void)
+{
+    vid6608::Config cfg {
+        .stepPin   = GPIO_NUM_14,
+        .dirPin    = GPIO_NUM_18,
+        .maxSteps  = 12 * 320,
+    };
+    vid6608 driver = vid6608(cfg);
+
+    driver.zero();
+    vTaskDelay(pdMS_TO_TICKS(2000));
+    driver.setPos(12 * 180);
+}
+```

lib/libesp32/esp-32-vid6608-rmt/idf_component.yml

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+## IDF Component Manager Manifest File
+description: "ESP32 library to drive automotive steppers like X27-168 via IC VID668 driver using HW RMT API"
+url: "https://github.com/petrows/esp-32-vid6608-rmt"
+repository: "https://github.com/petrows/esp-32-vid6608-rmt.git"
+maintainers:
+  - Petr Golovachev <petro@petro.ws>
+documentation: "https://github.com/petrows/esp-32-vid6608-rmt/blob/master/README.md"
+tags:
+  - Stepper
+  - VID6608
+dependencies:
+  idf:
+    version: ">=5.5.0"

lib/libesp32/esp-32-vid6608-rmt/library.json

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+{
+  "name": "esp-32-vid6608-rmt",
+  "version": "1.2",
+  "keywords": "esp32, espressif, vid6608, x27-168, rmt, stepper",
+  "description": "ESP32 library to drive Automotive gauge drivers like x27-168 using HW RMT driver",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/petrows/esp-32-vid6608-rmt.git"
+  },
+  "authors": {
+    "name": "Petr Golovachev",
+    "email": "petro@petro.ws",
+    "url": "https://petro.ws/"
+  },
+  "frameworks": "espidf,arduino",
+  "platforms": "espressif32"
+}