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/*
* 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
{
/**
* @brief TM1637 7-Segment Display library
* @defgroup tm1637 libupm-tm1637
* @ingroup seeed gpio display
*/
/**
* @library tm1637
* @sensor tm1637
* @comname TM1637 7-Segment Display
* @altname Grove 4-Digit Display
* @type display
* @man seeed
* @con gpio
*
* @brief API for the TM1637 7-Segment Display
*
* TM1637 is a display controller for LED-based 7-segment displays.
* It can be used to address and write data to multiple display digits. This
* driver is based on the Grove version of the TM1637 display that uses 4
* digits, thus making it ideal for clock displays, timers, counters, or even
* score displays in a two-player arcade game.
*
* @image html tm1637.jpeg
* @snippet tm1637.cxx Interesting
*/
class TM1637
{
public:
/**
* Enum for the memory-mapped GPIO
*/
typedef enum {
NO = 0,
YES = 1
} M_FAST_GPIO;
/**
* TM1637 constructor
*
* @param clk_pin Clock pin the sensor is connected to
* @param dio_pin Data pin the sensor is connected to
* @param bright Initial brightness, from 0 (dark) to 7 (bright) (default is 3)
* @param mmio Fast memory-mapped GPIO writes; default is yes
*/
TM1637(int clk_pin, int dio_pin, int bright = 3, M_FAST_GPIO mmio = YES);
/**
* TM1637 destructor
*/
~TM1637();
/**
* Writes digits to the display in a 7-segment encoding
*
* @param digits Array of digits to send to the display
* @return 0 if successful, error code otherwise
*/
mraa_result_t write(uint8_t *digits);
/**
* Writes digits to the display in a 7-segment encoding
*
* @param d List of multiple arguments to send to the display
* @return 0 if successful, error code otherwise
*/
mraa_result_t write(int d, ...);
/**
* Writes a symbol (digit or letter) to the display in a specified index
*
* @param index 0-based index of the digit to change from the left
* @param symbol Digit or letter to display
* @return 0 if successful, error code otherwise
*/
mraa_result_t writeAt(int index, char symbol);
/**
* Writes all the digits or letters to the display as a string
*
* @param digits String of symbols to display
* @return 0 if successful, error code otherwise
*/
mraa_result_t write(std::string digits);
/**
* Toggles the colon between digits on the display
*
* @param value True to turn the colon on, false to turn it off
*/
void setColon(bool value);
/**
* Controls the brightness of the display
*
* @param value Brightness, from 0 (darkest) to 7 (brightest)
*/
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;
};
}
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