HspLed.h

00001 /*******************************************************************************
00002  * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a
00005  * copy of this software and associated documentation files (the "Software"),
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00009  * Software is furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included
00012  * in all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00015  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00016  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00017  * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
00018  * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
00019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
00020  * OTHER DEALINGS IN THE SOFTWARE.
00021  *
00022  * Except as contained in this notice, the name of Maxim Integrated
00023  * Products, Inc. shall not be used except as stated in the Maxim Integrated
00024  * Products, Inc. Branding Policy.
00025  *
00026  * The mere transfer of this software does not imply any licenses
00027  * of trade secrets, proprietary technology, copyrights, patents,
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00032  */
00033 #ifndef _LED_H_
00034 #define _LED_H_
00035 
00036 #include "mbed.h"
00037 
00038 /**
00039  * Driver for the HSP Led, supports different blink rates and patterns
00040  *
00041  * @code
00042  * #include <stdio.h>
00043  * #include "mbed.h"
00044  * #include "xxx.h"
00045  *
00046  * I2C i2c(I2C_SDA, I2C_SCL);
00047  * xxx xxx(&i2c);
00048  *
00049  * int main(void) {
00050  *     printf("Initialized xxx\n");
00051  *     while(1) {
00052  *         if (xxx.init() != 0) {
00053  *             printf("Error communicating with xxx\n");
00054  *         } else {
00055  *             printf("Initialized xxx\n");
00056  *             break;
00057  *         }
00058  *         wait(1);
00059  *     }
00060  *
00061  *     while(1) {
00062  *         printf("");
00063  *         wait(1);
00064  *     }
00065  * }
00066  * @endcode
00067  */
00068 
00069 class HspLed {
00070 public:
00071   static const int LED_ON = 0;
00072   static const int LED_OFF = 1;
00073 
00074   /// define all of the modes the LED can support
00075   typedef enum eMode {
00076     eLedOn,
00077     eLedOff,
00078     eLedPeriod,
00079     eLedPattern
00080   } eMode;
00081   /// define the values that turn the LED on or off at the pin
00082   #define HSP_LED_ON 0
00083   #define HSP_LED_OFF 1
00084 
00085   /*
00086   * @brief Constructor where you specify the LED pin name
00087   */
00088   HspLed(PinName ledPin);
00089   
00090   /**
00091   * Blink the HSP LED at a set time interval
00092   * @param mSeconds Number of seconds to set the timer interval
00093   */
00094   void blink(uint32_t mSeconds);
00095   
00096   /**
00097   * @brief Start rotating the LED through a 32-bit pattern at a mS rate specified
00098   * @param pattern 32-bit pattern to rotate through
00099   * @param mSeconds the amount of time to take per bit in the pattern
00100   */ 
00101   void pattern(uint32_t pattern, uint32_t mSeconds);
00102   
00103   /**
00104   * @brief Turn the LED on
00105   */
00106   void on(void);
00107   
00108   /**
00109   * @brief Turn the LED off
00110   */
00111   void off(void);
00112 
00113   /**
00114   * @brief Update the LED
00115   */ 
00116   void service(void);
00117 
00118 private:
00119 
00120   /**
00121   * Set the mode of the LED, the mode include blinking at a set rate or blinking
00122   * according to a pattern
00123   * @param mode Mode to set the LED to
00124   */
00125   void setMode(eMode state);
00126   
00127   /**
00128   * Toggle the state of the LED
00129   */
00130   void toggle(void);
00131 
00132   /**
00133   * Start the LED blinking or rotating through a pattern
00134   */
00135   void start(void);
00136 
00137   /**
00138   * Stop blinking or rotating through a pattern
00139   */
00140   void stop(void);
00141   
00142   /**
00143   * Write the LED pin to a state
00144   * @param state A one or zero value to write to the LED pin
00145   */  
00146   void state(int state);
00147 
00148   /*
00149   * @brief Single step through the pattern and output to the LED
00150   */
00151   void patternToLed(void);
00152 
00153   /// timer interval in mS
00154   float timerInterval;
00155   /// last timer interval set to... used to prevent resetting the timer to the same value
00156   float timerIntervalLast;
00157   /// local state of the pattern to rotate through
00158   uint32_t bitPattern;
00159   /// current mode of the LED
00160   eMode mode;
00161   /// the LED digital output
00162   DigitalOut redLed;
00163   /// Timer service used to update the LED
00164   Ticker ticker;
00165   /// Flag to indicate if the timer has been started
00166   bool isStarted;
00167 };
00168 
00169 #endif /* _LED_H_ */