https://github.com/okeuday/odroid_display

Odroid-C1 Display Service for CloudI
https://github.com/okeuday/odroid_display

c cloudi microservice

Last synced: about 1 month ago
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Odroid-C1 Display Service for CloudI

• Host: GitHub
• URL: https://github.com/okeuday/odroid_display
• Owner: okeuday
• Created: 2015-02-20T19:10:26.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2023-10-27T22:33:38.000Z (about 1 year ago)
• Last Synced: 2023-10-27T23:26:32.203Z (about 1 year ago)
• Topics: c, cloudi, microservice
• Language: C
• Homepage:
• Size: 34.2 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.markdown

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README

        
Odroid-C1 Display Service for [CloudI](https://cloudi.org)

==========================================================

Example use of this service is shown in the [`odroid_fish`](https://github.com/okeuday/odroid_fish#example) repository.

This service shows how CloudI can isolate C dependencies for hardware so

higher-level data processing can run decoupled (keeping the fault-tolerance

constraints on both pieces of source code separate).

Currently only the [16x2 LCD display](https://www.hardkernel.com/shop/16x2-lcd-io-shield/) is supported.

Compilation requires the Odroid-C1 [wiringPi library fork](https://github.com/hardkernel/wiringPi).

Usage

-----

The format for the service request is:

    uint8  (7 status LEDs bitmask to set as off)

    uint8  (7 status LEDs bitmask to set as on)

    uint8  (7 status LEDs bitmask to set opposite value (toggle))

    char[] (32 UTF8 characters, '\0' causes no display change)

The characters supported are limited by the HD44780U A00 character set

which is commonly used for LCD displays.

The supported UTF8 characters are:

* ' ' (no-break space)

* ¢

* ¥

* °

* µ

* ·

* ä

* ñ

* ö

* ÷

* ü

* Σ (upper greek sigma)

* Ω (upper greek omega)

* α (lower greek alpha)

* β (lower greek beta)

* γ (lower greek delta)

* ε (lower greek epsilon)

* θ (lower greek theta)

* μ (lower greek mu)

* π (lower greek pi)

* ρ (lower greek rho)

* ₤ (lira currency)

* ← (left arrow)

* → (right arrow)

* ∑ (n-ary summation (upper greek sigma))

* √ (square root)

* ∞ (infinity)

* ⌜ (top left corner)

* ⌟ (bottom right corner)

* █ (full block)

The unsupported ASCII characters are:

* \

* ~

TODO

----

* Add UTF8 Japanese characters

* Add support for the A02 character set (?)