gpio.hpp

/*
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Copyright (c) 2014 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include "gpio.h"
#include <stdexcept>

#if defined(SWIGJAVASCRIPT)
#if NODE_MODULE_VERSION >= 0x000D
#include <uv.h>
#endif
#endif

namespace mraa
{

// These enums must match the enums in gpio.h

typedef enum {
    MODE_STRONG = 0,   
    MODE_PULLUP = 1,   
    MODE_PULLDOWN = 2, 
    MODE_HIZ = 3       
} Mode;

typedef enum {
    DIR_OUT = 0,      
    DIR_IN = 1,       
    DIR_OUT_HIGH = 2, 
    DIR_OUT_LOW = 3   
} Dir;

typedef enum {
    EDGE_NONE = 0,   
    EDGE_BOTH = 1,   
    EDGE_RISING = 2, 
    EDGE_FALLING = 3 
} Edge;

class Gpio
{
  public:
    Gpio(int pin, bool owner = true, bool raw = false)
    {
        if (raw) {
            m_gpio = mraa_gpio_init_raw(pin);
        } else {
            m_gpio = mraa_gpio_init(pin);
        }

        if (m_gpio == NULL) {
            throw std::invalid_argument("Invalid GPIO pin specified");
        }

        if (!owner) {
            mraa_gpio_owner(m_gpio, 0);
        }
    }
    ~Gpio()
    {
        mraa_gpio_close(m_gpio);
    }
    mraa_result_t
    edge(Edge mode)
    {
        return mraa_gpio_edge_mode(m_gpio, (gpio_edge_t) mode);
    }
#if defined(SWIGPYTHON)
    mraa_result_t
    isr(Edge mode, PyObject* pyfunc, PyObject* args)
    {
        return mraa_gpio_isr(m_gpio, (gpio_edge_t) mode, (void (*) (void*)) pyfunc, (void*) args);
    }
#elif defined(SWIGJAVASCRIPT)
    static void
    v8isr(uv_work_t* req, int status)
    {
        mraa::Gpio* This = (mraa::Gpio*) req->data;
        int argc = 1;
        v8::Local<v8::Value> argv[] = { SWIGV8_INTEGER_NEW(-1) };
#if NODE_MODULE_VERSION >= 0x000D
        v8::Local<v8::Function> f = v8::Local<v8::Function>::New(v8::Isolate::GetCurrent(), This->m_v8isr);
        f->Call(SWIGV8_CURRENT_CONTEXT()->Global(), argc, argv);
#else
        This->m_v8isr->Call(SWIGV8_CURRENT_CONTEXT()->Global(), argc, argv);
#endif
        delete req;
    }

    static void
    nop(uv_work_t* req)
    {
        // Do nothing.
    }

    static void
    uvwork(void* ctx)
    {
        uv_work_t* req = new uv_work_t;
        req->data = ctx;
        uv_queue_work(uv_default_loop(), req, nop, v8isr);
    }

    mraa_result_t
    isr(Edge mode, v8::Handle<v8::Function> func)
    {
#if NODE_MODULE_VERSION >= 0x000D
        m_v8isr.Reset(v8::Isolate::GetCurrent(), func);
#else
        m_v8isr = v8::Persistent<v8::Function>::New(func);
#endif
        return mraa_gpio_isr(m_gpio, (gpio_edge_t) mode, &uvwork, this);
    }
#else

    mraa_result_t
    isr(Edge mode, void (*fptr)(void*), void* args)
    {
        return mraa_gpio_isr(m_gpio, (gpio_edge_t) mode, fptr, args);
    }
#endif

    mraa_result_t
    isrExit()
    {
#if defined(SWIGJAVASCRIPT)
#if NODE_MODULE_VERSION >= 0x000D
        m_v8isr.Reset();
#else
        m_v8isr.Dispose();
        m_v8isr.Clear();
#endif
#endif
        return mraa_gpio_isr_exit(m_gpio);
    }
    mraa_result_t
    mode(Mode mode)
    {
        return mraa_gpio_mode(m_gpio, (gpio_mode_t) mode);
    }
    mraa_result_t
    dir(Dir dir)
    {
        return mraa_gpio_dir(m_gpio, (gpio_dir_t) dir);
    }
    int
    read()
    {
        return mraa_gpio_read(m_gpio);
    }
    mraa_result_t
    write(int value)
    {
        return mraa_gpio_write(m_gpio, value);
    }
    mraa_result_t
    useMmap(bool enable)
    {
        return mraa_gpio_use_mmaped(m_gpio, (mraa_boolean_t) enable);
    }
    int
    getPin(bool raw = false)
    {
        if (raw) {
            return mraa_gpio_get_pin_raw(m_gpio);
        }
        return mraa_gpio_get_pin(m_gpio);
    }

  private:
    mraa_gpio_context m_gpio;
#if defined(SWIGJAVASCRIPT)
    v8::Persistent<v8::Function> m_v8isr;
#endif
};
}