tm1637.hpp

/*
 * Author: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
 * Copyright (c) 2015 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 <unistd.h>
#include <stdint.h>
#include <string>
#include <iostream>

#include <mraa/gpio.h>


// TM1637-specific register addresses for writing all digits at a time
#define TM1637_ADDR    0x40
#define TM1637_REG     0xC0
#define TM1637_CMD     0x88

// Display-specific values
#define M_DISPLAY_DIGITS  4

namespace upm
{

  class TM1637
  {
  public:
      typedef enum {
        NO  = 0,
        YES = 1
      } M_FAST_GPIO;
      TM1637(int clk_pin, int dio_pin, int bright = 3, M_FAST_GPIO mmio = YES);
      ~TM1637();
      mraa_result_t write(uint8_t *digits);
      mraa_result_t write(int d, ...);
      mraa_result_t writeAt(int index, char symbol);
      mraa_result_t write(std::string digits);
      void setColon(bool value);
      void setBrightness(int value);

  private:
      void i2c_start();
      void i2c_stop();
      void i2c_writeByte(uint8_t value);
      void update();
      uint8_t encode(char c);

      mraa_gpio_context m_clk, m_dio;
      std::string m_name;
      uint8_t m_digits[4];
      uint8_t m_brightness;
  };
}