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Helios64 Hardware Detailed Info (#27)

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* Add detailed hardware info for Helios64
    - Button
    - Ethernet
    - Front Panel
    - GPIO
    - I2C
    - Jumper
    - LED
    - M.2
    - PMIC
    - PWM Fan
    - RTC
    - SATA
    - SPI
    - UEXT
    - UPS
    - USB

* Cosmetic upgrade and adapt to latest mkdocs-material version

Co-authored-by: nurix <nurix@pnsnc.local>
Co-authored-by: Aditya Prayoga <aditya@kobol.io>
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Gauthier Provost 2020-04-20 16:06:24 +08:00 • committed by GitHub
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Helios64 has one UEXT (Universal-Extension-Connector) header which exposes 3 serial communication interfaces into a single header:
* I2C
* SPI
* RS232 (UART)
![P2 Location](/helios64/img/uext/uext.jpg)
## Pinout Table
![P2 Pinout](/helios64/img/uext/uext_pinout.jpg)
Below is the full pinout of the UEXT header:
| PIN | Port | Remarks |
|-----|------|-------------|
| 1 | 3.3V | |
| 2 | GND | |
| 3 | TXD (UART) | |
| 4 | RXD (UART) | |
| 5 | SCL (I2C) | |
| 6 | SDA (I2C) | |
| 7 | MISO (SPI) | |
| 8 | MOSI (SPI) | |
| 9 | SCK (SPI) | |
|10 | SSEL (SPI) | |
!!! Warning
Be careful with the header polarity when connecting.
## SPI & I2C
Refer to the respective pages directly:
- [SPI](/helios64/hardware/)
- [I2C](/helios64/I2C/)
## RS232 (UART)
The UART bus exposed on the UEXT header is the same than the RK3399 SoC serial console exposed on the USB Type-C. There is no dedicated UART bus on the UEXT connector. The intention is to allow user to connect to SoC serial console by another way than the USB-to-Serial bridge.
!!! Important
If you connect some modules which might require dedicated serial UART line to the SoC, this module will not operate properly.