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Update Hardweare GPIO page

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Gauthier Provost 2020-04-12 19:33:40 +08:00
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docs/helios64/gpio.md
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## User Accessible GPIOs (P5)
Helios64 provides 16 GPIOs via a 20-Pin header (P5). Those GPIOs are provided via an 16-bit IO Expander [PCA9655E](http://www.onsemi.com/PowerSolutions/product.do?id=PCA9655E) connected to I2C bus 2.
Helios64 provides 22 GPIOs on header P5 which can be used for user application.
Those GPIOs are provided via an 16-bit IO Expander [PCA9655E](http://www.onsemi.com/PowerSolutions/product.do?id=PCA9655E) connected to I2C bus 2.
![GPIO](/helios64/img/gpio/gpio.jpg)
Unlike Helios4 whereas some pin of IO expander is used for system usage, on Helios64 all 16 GPIOs can be used for user application.
## Pinout
![P5 Pinout](/helios64/img/gpio/gpio.jpg)
## Pinout Table
![P5 Pinout](/helios64/img/gpio/gpio_pinout.jpg)
| PIN | Port | Remarks |
|-----|------|-------------|

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