wiringPiNim

Nim-lang wrapper for the C library wiringPi. This wrapper implements some of the wiringPi functions for quick access in Nim for controlling a Raspberry Pi.

General

Only "Core funcions" is available. If other functions in the wiringPi C library is needed, please make a PR or a Issue with details.

Prerequisites

Your need to have installed/build the wiringPi library on your system.

Either follow http://wiringpi.com/download-and-install/ or:

cd
git clone git://git.drogon.net/wiringPi
cd wiringPi
./build

To ensure that the wiringPi library is installed correctly, this command should give you some output:

gpio readall

Include wiringPiNim in your code

Imports

import wiringPiNim

Add to your code

Init

It is required that you initialize the board, before you use the GPIO's. This can be done with:

if piSetup() >= 0:
  echo "The RPi is ready"

Have fun

Please look in the sourcecode wiringPiNim.nim or generate the docs nim doc wiringPiNim.nim for further information.

if piSetup() >= 0:
  piPinModeOutput(24)
  piDigitalWrite(24, 1)
  piDigitalRead(24)

Available procs

proc piSetup*(): cint
  ## Setup/initialize the RPi.
  ##
  ## This maps the GPIO to the wiringPi pin numbering scheme

proc piSetupGPIO*(): cint
  ## Setup/initialize the RPi.
  ##
  ## This maps the GPIOs to Broadcom.
  ##
  ## Root is required.

proc piSetupPhys*(): cint
  ## Setup/initialize the RPi.
  ##
  ## This maps the GPIOs to Broadcom and use the physical pin numbers on 
  ## the P1 connector only.
  ##
  ## Root is required.

proc piSetupSys*(): cint
  ## Setup/initialize the RPi.
  ##
  ## This initialises wiringPi but uses the /sys/class/gpio interface 
  ## rather than accessing the hardware directly

proc piPinModeOutput*(pin: cint)
  ## Sets the pinmode to OUTPUT

proc piPinModeInput*(pin: cint)
  ## Sets the pinmode to INPUT

proc piPinModeGPIO*(pin: cint)
  ## Sets the pinmode to GPIO_CLOCK
  ##
  ## Note that only wiringPi pin 7 (BCM_GPIO 4) supports CLOCK output

proc piPinModePWM*(pin: cint)
  ## Sets the pinmode to PWM_OUTPUT
  ##
  ## Note that only wiringPi pin 1 (BCM_GPIO 18) supports PWM output

proc piDigitalPWM*(pin, value: cint)
  ## Writes the value to the PWM register for the given pin. The Raspberry
  ## Pi has one on-board PWM pin, pin 1 (BMC_GPIO 18, Phys 12) and the
  ## range is 0-1024. Other PWM devices may have other PWM ranges.

proc piDigitalWrite*(pin, value: cint)
  ## Writes the value HIGH or LOW (1 or 0) to the given pin which must have
  ## been previously set as an output.

proc piDigitalRead*(pin: cint): cint
  ## This function returns the value read at the given pin. It will be HIGH 
  ## or LOW (1 or 0) depending on the logic level at the pin.

proc piPullOff*(pin: cint): cint
  ## Sets the pull-up or pull-down resistor mode to no-pull up/down

proc piPullDown*(pin: cint): cint
  ## Sets the pull-up or pull-down resistor mode to pull to ground

proc piPullUp*(pin: cint): cint
  ## Sets the pull-up or pull-down resistor mode to pull to 3.3v

proc analogWrite*(pin, value: cint)
  ## This writes the given value to the supplied analog pin. You will need 
  ## to register additional analog modules to enable this function for 
  ## devices such as the Gertboard.

proc analogRead*(pin: cint): cint
  ## This returns the value read on the supplied analog input pin. You will 
  ## need to register additional analog modules to enable this function for
  ## devices such as the Gertboard, quick2Wire analog board, etc.

String to cint

Please note that the args is in cint. To transform a string, the following method could be used:

let pinString = "2"
let pinCint = toU32(parseInt(pinString))

Examples

Activating a buzzer

import wiringPiNim, os

# Setting the pin for a buzzer
const buzzer = 6

if piSetup() >= 0:
  echo "RPi is setup and ready for use"

  # Setting the buzzers pin to output
  piPinModeOutput(buzzer)

  # Turning on the buzzer
  piDigitialWrite(buzzer, 1)
  echo piDigitalRead(buzzer)      
  echo "Buzzer is activated"

  sleep(2000)

  # Turning off the buzzer
  piDigitalWrite(buzzer, 0)
  echo piDigitalRead(buzzer)
  echo "Buzzer is deactivated"

LED flashing (async)

import wiringPiNim, asyncdispatch

# Setting the pin for a LED
const led = 24

proc flashLed() {.async.} =
  if piSetup() >= 0:
    # Setting the LEDs pin to output
    piPinModeOutput(led)
    echo "RPi is setup and ready for use"

    while true:
      piDigitalWrite(led, 1)
      await sleepAsync(800)

      piDigitalWrite(led, 0)
      await sleepAsync(800)

waitFor flashLed()

LED flashing (sync)

import wiringPiNim, os

# Setting the pin for a LED
const led = 24

proc flashLed() =
  if piSetup() >= 0:
    # Setting the LEDs pin to output
    piPinModeOutput(led)
    echo "RPi is setup and ready for use"

    while true:
      piDigitalWrite(led, 1)
      sleep(800)

      piDigitalWrite(led, 0)
      sleep(800)

flashLed()

Monitoring with a PIR sensor

import wiringPiNim, os

const pir = 1

proc monitorPir() =
  if piSetup() >= 0:
    piPinModeInput(pir)

    while true:
      if piDigitalRead(pir) == 1:
        echo "Detected something!"
      sleep(200)

monitorPir()

Monitoring with a magnetic door contact

import wiringPiNim, asyncdispatch

const door = 29

proc monitorDoor() {.async.} =
  if piSetup() >= 0:
    piPinModeOutput(door)
    piPullUp(door)

    while true:
      if piDigitalRead(door) == 1:
        echo "Door is open!"
      await sleepAsync(200)

waitFor monitorDoor()

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