wiringlua.lua

--[[
--
--	This is a lua jit wiringpi interface through luajit.
--	it's slow. it's bad. but it works.
--	
--	(c) 2016-2017 Lumaio
--
--]]


local ffi = require ("ffi")

ffi.cdef[[

enum output {
	LOW,
	HIGH
};

enum mode {
	INPUT,
	OUTPUT
};

/// wiringPi.h
int wiringPiSetup();

void pinModeAlt(int pin, int mode);
void pinMode(int pin, int mode);

int digitalRead(int pin);
void digitalWrite(int pin, int value);
int analogRead(int pin);
void analogWrite(int pin, int value);

void delay(unsigned int howLong);
void delayMicroseconds(unsigned int howLong);
unsigned int millis();
unsigned int micros();

// wiringPiI2C.h

int wiringPiI2CRead (int fd);
int wiringPiI2CReadReg8 (int fd, int reg);
int wiringPiI2CReadReg16 (int fd, int reg);

int wiringPiI2CWrite (int fd, int data);
int wiringPiI2CWriteReg8 (int fd, int reg, int data);
int wiringPiI2CWriteReg16 (int fd, int reg, int data);

int wiringPiI2CSetupInterface(const char* device, int devId);
int wiringPiI2CSetup(const int devId);


]]

-- load symnols from wiringPi.so

local wiringlua = {_internal={}, timer={}, i2c={}}
wiringlua._internal.lib = ffi.load("wiringPi")

-- functions for wiring pi
function wiringlua.setup()
	wiringlua.low = wiringlua._internal.lib.LOW
	wiringlua.high = wiringlua._internal.lib.HIGH
	
	wiringlua.input = wiringlua._internal.lib.INPUT
	wiringlua.output = wiringlua._internal.lib.OUTPUT

	return wiringlua._internal.lib.wiringPiSetup()
end

function wiringlua.setMode(pin, mode)
	wiringlua._internal.lib.pinMode(pin, mode)
end

function wiringlua.write(pin, mode)
	wiringlua._internal.lib.digitalWrite(pin, mode)
end

function wiringlua.read(pin)
	return wiringlua._internal.lib.digitalRead(pin)
end

function wiringlua.analogWrite(pin, data)
	wiringlua._internal.lib.analogWrite(pin, data)
end

function wiringlua.analogRead(pin)
	return wiringlua._internal.lib.analogRead(pin)
end

-- timing functions

function wiringlua.timer.delay(time)
	wiringlua._internal.lib.delay(time)
end

function wiringlua.timer.delayMicro(time)
	wiringlua._internal.lib.delayMicroseconds(time)
end

function wiringlua.timer.getMillis()
	return wiringlua._internal.lib.millis()
end

function wiringlua.timer.getMicros()
	return wiringlua._internal.lib.micros()
end

-- i2c functions

function wiringlua.i2c.read(fd)
	return wiringlua._internal.lib.wiringPiI2CRead(fd)
end

function wiringlua.i2c.read8(fd, reg)
	return wiringlua._internal.lib.wiringPiI2CReadReg8(fd, reg)
end

function wiringlua.i2c.read16(fd, reg)
	return wiringlua._internal.lib.wiringPiI2CReadReg16(fd, reg)
end

function wiringlua.i2c.write(fd, data)
	return wiringlua._internal.lib.wiringPiI2CWrite(fd, data)
end

function wiringlua.i2c.write8(fd, reg, data)
	return wiringlua._internal.lib.wiringPiI2CWriteReg8(fd, reg, data)
end

function wiringlua.i2c.write16(fd, reg, data)
	return wiringlua._internal.lib.wiringPiI2CWriteReg16(fd, reg, data)
end

function wiringlua.i2c.interface(device, id)
	return wiringlua._internal.lib.wiringPiI2CSetupInterface(device, id)
end

function wiringlua.i2c.setup(id)
	return wiringlua._internal.lib.wiringPiI2CSetup(id)
end

return wiringlua