+++ /dev/null
-# This file is part of NIT ( http://www.nitlanguage.org ).
-#
-# Copyright 2013 Alexandre Terrasa <alexandre@moz-code.org>
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Nit wrapping of the wiringPi library [http://wiringpi.com/]
-# WiringPi is an Arduino wiring-like library written in C
-# and released under the GNU LGPLv3 license which is usable
-# from C and C++ and many other languages with suitable wrappers
-module wiringPi
-
-in "C Header" `{
- #include <wiringPi.h>
-
- typedef struct {
- int id;
- } CRPiPin;
-`}
-
-
-redef class Object
- # This initialises wiringPi and assumes that the calling program is
- # going to be using the wiringPi pin numbering scheme.
- fun wiringPi_setup `{ wiringPiSetup(); `}
- # Same as wiringPi_setup, however it allows the calling programs to
- # use the Broadcom GPIO pin numbers directly with no re-mapping.
- fun wiringPi_setup_gpio `{ wiringPiSetupGpio(); `}
- # Identical to wiringPi_setup, however it allows the calling
- # programs to use the physical pin numbers on the P1 connector only.
- fun wiringPi_setup_phys `{ wiringPiSetupPhys(); `}
- # This initialises wiringPi but uses the /sys/class/gpio interface
- # rather than accessing the hardware directly.
- fun wiringPi_setup_sys `{ wiringPiSetupSys(); `}
-end
-
-# A Raspberry Pi GPIO Pin
-extern class RPiPin `{ CRPiPin *`}
- new (id: Int) `{
- CRPiPin *pin = malloc( sizeof(CRPiPin) );
- pin->id = id;
- return pin;
- `}
-
- # The pin `id` depends on wiringPi setup used
- fun id: Int `{ return recv->id; `}
-
- # Sets the mode of the pin
- fun mode(mode: RPiPinMode) `{ pinMode(recv->id, mode); `}
-
- # This sets the pull-up or pull-down resistor mode on the given pin,
- # which should be set as an input.
- fun pullup_dncontrol(pud: PUDControl) `{ pullUpDnControl(recv->id, pud); `}
-
- # Writes the value HIGH or LOW (true or false) to the given pin which must
- # have been previously set as an output.
- fun write(high: Bool) `{ digitalWrite(recv->id, high? HIGH: LOW); `}
-
- # 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.
- fun pwm_write(value: Int) `{ pwmWrite(recv->id, value); `}
-
- # This function returns the value read at the given pin.
- # It will be HIGH or LOW (true or false) depending on the logic level at the pin.
- fun read: Bool `{ return digitalRead(recv->id) == HIGH? true: false; `}
-end
-
-# RPI Pin modes
-# Modes are:
-# * INPUT
-# * OUTPUT
-# * PWM_OUTPUT
-# * GPIO_CLOCK
-# Note that only wiringPi pin 1 (BCM_GPIO 18) supports PWM output
-# and only wiringPi pin 7 (BCM_GPIO 4) supports CLOCK output modes.
-extern class RPiPinMode `{ int `}
- new input_mode `{ return INPUT; `}
- new output_mode `{ return OUTPUT; `}
- new pwm_mode `{ return PWM_OUTPUT; `}
- new clock_mode `{ return GPIO_CLOCK; `}
-end
-
-# The BCM2835 has both pull-up an down internal resistors.
-# The parameter pud should be:
-# * PUD_OFF, (no pull up/down)
-# * PUD_DOWN (pull to ground)
-# * PUD_UP (pull to 3.3v)
-# The internal pull up/down resistors have a value of approximately
-# 50Kohms on the Raspberry Pi.
-extern class PUDControl `{ int `}
- new off `{ return PUD_OFF; `}
- new down `{ return PUD_DOWN; `}
- new up `{ return PUD_UP; `}
-end
-
-# Abstraction a daisy chain of 74×595 shift registers
-class SR595
- private var registers: Array[Bool]
- private var nb_pins: Int
- private var ser: RPiPin
- private var rclk: RPiPin
- private var srclk: RPiPin
-
- # Initialize a new shift register chain
- # `nb_pins`: number of pins available
- # `ser_pin`: SER (serial) pin id
- # `rclk_pin`: RCLK (register clock) pin id
- # `srclk_pin`: SRCLK (serial clock) pin id
- init(nb_pins, ser_pin, rclk_pin, srclk_pin: Int) do
- # configure pin layout
- self.nb_pins = nb_pins
- self.ser = new RPiPin(7)
- self.rclk = new RPiPin(6)
- self.srclk = new RPiPin(5)
- clear_registers
- # enable output mode on shift register output
- ser.mode(new RPiPinMode.output_mode)
- rclk.mode(new RPiPinMode.output_mode)
- srclk.mode(new RPiPinMode.output_mode)
- end
-
- # write 'state' on register 'reg'
- fun write(reg: Int, state: Bool) do
- registers[reg] = state
- write_registers
- end
-
- # write all registers
- fun write_all(regs: Array[Bool]) do
- assert regs.length == nb_pins
- registers = regs
- write_registers
- end
-
- # clear all registers
- fun clear_registers do
- registers = new Array[Bool].filled_with(false, nb_pins)
- write_registers
- end
-
- private fun write_registers do
- rclk.write(false)
- var i = registers.length - 1
- while i >= 0 do
- var reg = registers[i]
- srclk.write(false)
- ser.write(reg)
- srclk.write(true)
- i -= 1
- end
- rclk.write(true)
- end
-end
-
nitlanguage / nit.git / blobdiff