tm1637: brand new working implementation

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/tm1637/tm1637.h

@@ -0,0 +1,149 @@
+/*
+ * 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
+ * @type display
+ * @man seeed
+ * @con gpio
+ *
+ * @brief C++ API for TM1637 (7-segment display)
+ *
+ * The 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 which uses 4
+ * digits thus making it ideal for clock displays, timers, counters or even
+ * score display in a two player arcade game.
+ *
+ * @image html tm1637.jpeg
+ * @snippet tm1637.cxx Interesting
+ */
+
+  class TM1637
+  {
+  public:
+      /**
+       * Enum for memory mapped GPIO
+       */
+      typedef enum {
+        NO  = 0,
+        YES = 1
+      } M_FAST_GPIO;
+      /**
+       * TM1637 constructor
+       *
+       * @param clk_pin the clock pin the sensor is connected to
+       * @param dio_pin the data pin the sensor is connected to
+       * @param bright initial brightness from 0 to 7 dark to bright (default 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();
+      /**
+       * Write digits to the display in 7 segment encoding
+       *
+       * @param digits an array of digits to send to the display
+       * @return 0 if the write was successful, error code otherwise
+       */
+      mraa_result_t write(uint8_t *digits);
+      /**
+       * Write digits to the display in 7 segment encoding
+       *
+       * @param d list of multiple arguments to send to the display
+       * @return 0 if the write was successful, error code otherwise
+       */
+      mraa_result_t write(int d, ...);
+      /**
+       * Write a symbol (digit or letter) to the display at a specified index
+       *
+       * @param index 0-based index of the digit to change from the left
+       * @param symbol the digit or letter to display
+       * @return 0 if the write was successful, error code otherwise
+       */
+      mraa_result_t writeAt(int index, char symbol);
+      /**
+       * Write all the digits or letters to the display as a string
+       *
+       * @param digits a string of symbols to display
+       * @return 0 if the write was successful, error code otherwise
+       */
+      mraa_result_t write(std::string digits);
+      /**
+       * Toggles the colon between digits on the display
+       *
+       * @param value pass true to turn on the colon, false to turn it off
+       */
+      void setColon(bool value);
+      /**
+       * Use to control the brightness of the display
+       *
+       * @param value between 0 and 7, darkest to 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;
+  };
+}