GPIO Deamon for Raspberry Pi

##What does it?

This small Server open a unix socket to contol the gpio pins without need of root rights to other programms.

##External Requirements

• wiringPi git submodule included
• rpi-dog128 git submodule included
• libconfig [http://www.hyperrealm.com/libconfig/]
• pthread

##TODO

• Implement multiple client.
• Add simple Security.

##COMMANDS

• READ pin
  • Read the given output pin.
• WRITE pin
  • Write the given input pin.
• READALL
  • Read the status of all pins.
• MODE pin mode
  • Set the mode of the pin. Modus: IN|OUT
• LCD INFO
  • Print all LCD Commands
• LCD FONTINFO
  • Print all exising Fonts.
• LCD CLEAR
  • Clear LCD Framebuffer.
• LCD SHOW
  • Send framebuffer to LCD.
• LCD LINE x1 y1 x2 y2
  • Write line from x1 y1 to x2 y2 in framebuffer.
• LCD RECT x1 y1 x2 y2 fill
  • Write rectangle from left top x1 y1 to right bottom x2 y2 with fill=1 or not fill=0 in framebuffer.
• LCD CIRCLE cx cy radius fill
  • Write circle cx cy radius with fill=1 or not fill=0 in framebuffer.
• LCD ELLIPSE cx cy radius1 radius2 fill
  • Write ellipse cx cy and radius1 + radius2 with fill=1 or not fill=0 in framebuffer.
• LCD BACKLIGHT percent
  • Set LED Backlight in percent.
• LCD CONTRAST cont
  • Set contrast between 6 and 24.
• LCD TEXT fontId x y text
  • Write the text with frontId at position x y in framebuffer.
• LCD DOT x y
  • Write a dot at x y in framebuffer.
• LCD COLOR color
  • Set color to 1 write or 0 delete for every write command.
• LCD INVERT
  • Invert the display.
• LCD DSPNORMAL n
  • Set display normal to 0 or 1.

##Configfile Example Config File

# Example gpiod configuration

# Unix Socket file
socket = "/var/lib/gpiod/socket";

# Setup the pins for the spi lcd interface (dog128)
lcd = {
  di_pin  = 6; /* Pin where the DI is attached */
  led_pin = 1; /* PWM pin to change backlight led brigness */
  spi_cs  = 0; /* SPI chipselect id */
};


# Interrupts 
interrupt = ( { pin  = 4;         /* WiringPi gpio pin number */
                type = "falling"; /* Interrupt edge ["falling", "rising", "both"] */
                name = "Goal1";   /* Name to write on interrupt to the socket */
                wait = 500;       /* Wait in milliseconds until next interrupt will be processed */
                pud  = "none"; }, /* Init pin with "none", "up", "down" resistor */
              { pin  = 5;
                type = "falling";
                name = "Goal2";
                wait = 500; 
                pud  = "none"; },
              { pin  = 16;
                type = "rising";
                name = "Bottom";
                wait = 500; 
                pud  = "up"; },
              { pin  = 7;
                type = "rising";
                name = "Left";
                wait = 500; 
                pud  = "up"; },
              { pin  = 2;
                type = "rising";
                name = "Top";
                wait = 500; 
                pud  = "up"; },
              { pin  = 0;
                type = "rising";
                name = "Middle";
                wait = 500; 
                pud  = "up"; },
              { pin  = 3;
                type = "rising";
                name = "Right";
                wait = 500; 
                pud  = "up"; } 
            );