MIT License

Copyright (c) 2025 Shenzhen Xinzhi Future Technology Co., Ltd.
Copyright (c) 2025 Project Contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Source: https://github.com/CloudZao/Metalio-E-INK4-Plus

Material used from this project:

- `main/boards/metalio-e-ink4-plus/config.h` - pin map, TCA9555 bit assignments
- `main/boards/metalio-e-ink4-plus/bus/tps65185.{c,h}` - TPS65185 register map, VCOM
  encoding (mV/10 across VCOM2/VCOM1) and the thermistor conversion sequence
- `main/boards/metalio-e-ink4-plus/bus/pca9555.{c,h}` - 9555 access pattern
- `main/boards/metalio-e-ink4-plus/display/epd_board_metalio_eink4_plus.c` - the
  TPS65185 power-on/power-off sequence and its interaction with PWR_GOOD
- `main/boards/metalio-e-ink4-plus/display/epdiy_riscv_ve_stub.c` - the C equivalents
  of the Xtensa SIMD paths, including the ESP32-S31 in-byte pixel order
- `main/boards/metalio-e-ink4-plus/display/output_lcd/{lcd_driver.c,render_lcd.c}` -
  the ESP32-S31 LCD blocks: dedicated LCD_DATA IOMUX, cache-coherent bounce buffers
  and the pixel-clock gate the HAL leaves shut

Portions of this project are Apache-2.0 (see the top-level LICENSE) and portions
under `components/epdiy/` are LGPL-3.0-or-later; this MIT notice covers the
material listed above wherever it appears, and the other licenses are not
superseded.

本项目部分代码移植自 Metalio E-Ink4-Plus 示例固件，遵循其 MIT 许可，版权与许可
声明见上。