upm/src/hm11/hm11.h

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * Thanks to Adafruit for supplying a google translated version of the
 * Chinese datasheet and some clues in their code.
 *
 * 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 <string>
#include <iostream>

#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <mraa/uart.h>

#define HM11_DEFAULT_UART 0

namespace upm {
    /**
     * @brief UPM library for the HM-11 Bluetooth 4.0 Low Energy Module
     * @defgroup hm11 libupm-hm11
     * @ingroup seeed serial wifi
     */

    /**
     * @library hm11
     * @sensor hm11
     * @comname HM-11 Bluetooth 4.0 Low Energy Module
     * @altname HM-10, HM-12
     * @category wifi
     * @manufacturer seeed
     * @connection uart
     * @web http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf
     *
     * @brief C++ API HM-11 4.0 Bluetooth Low Energy Module
     *
     * The driver was tested with the Grove BLE module.  Its an HM-11
     * BLE 4.0 module based on a TI CC2541 chip.  It operates using a
     * standard 'AT' command set.  See the datasheet for a full list
     * of available commands and their possible responses.
     *
     * http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf
     *
     * It is connected via a UART at 9600 baud.
     * 
     * @snippet hm11.cxx Interesting
     */

  class HM11 {
  public:

    /**
     * HM11 module constructor
     *
     * @param uart default uart to use (0 or 1)
     */
    HM11(int uart);

    /**
     * HM11 module Destructor
     */
    ~HM11();

    /**
     * check to see if there is data available for reading
     *
     * @param millis number of milliseconds to wait, 0 means no wait.
     * @return true if there is data available to be read
     */
    bool dataAvailable(unsigned int millis);

    /**
     * read any available data into a user-supplied buffer.  Note, the
     * call will block until data is available to be read.  Use
     * dataAvailable() to determine whether there is data available
     * beforehand, to avoid blocking.
     *
     * @param buffer the buffer to hold the data read
     * @param len the length of the buffer
     * @return the number of bytes read
     */
    int readData(char *buffer, size_t len);

    /**
     * write the data in buffer to the device
     *
     * @param buffer the buffer to hold the data read
     * @param len the length of the buffer
     * @return the number of bytes written
     */
    int writeData(char *buffer, size_t len);

    /**
     * setup the proper tty i/o modes and the baudrate.  The default
     * baud rate is 9600 (B9600) for this device.
     *
     * @param baud the desired baud rate.  
     * @return true if successful
     */
    bool setupTty(speed_t baud=B9600);


  protected:
    int ttyFd() { return m_ttyFd; };
    int setTtyFd(int fd) { m_ttyFd = fd; };

  private:
    mraa_uart_context m_uart;
    int m_ttyFd;
  };
}