okeuday/odroid_display

Odroid-C1 Display Service for CloudI

Odroid-C1 Display Service for CloudI

Example use of this service is shown in the odroid_fish 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 is supported. Compilation requires the Odroid-C1 wiringPi library fork.

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 (?)