ACMP.h

00001 /**
00002  * LPC8xx Internal Analog Comparator library for mbed
00003  * Copyright (c) 2015 Suga
00004  * Released under the MIT License: http://mbed.org/license/mit
00005  */
00006 /** @file
00007  * @brief LPC8xx Internal Analog Comparator library for mbed
00008  */
00009 
00010 #ifndef _ACMP_H_
00011 #define _ACMP_H_
00012 
00013 #include "mbed.h"
00014 
00015 #if !defined(TARGET_LPC81X) && !defined(TARGET_LPC82X)
00016 #error "supported for LPC8xx"
00017 #endif
00018 
00019 /** ACMP class
00020  */
00021 class ACMP {
00022 public:
00023     enum VSEL {
00024         LADDER  = 0, // voltage ladder
00025         ACMP_I1 = 1, // P0.0
00026         ACMP_I2 = 2, // P0.1
00027 #if defined(TARGET_LPC81X)
00028         BANDGAP = 6,
00029 #elif defined(TARGET_LPC82X)
00030         ACMP_I3 = 3, // P0.14
00031         ACMP_I4 = 4, // P0.23
00032         BANDGAP = 5,
00033         ADC_0   = 6,
00034 #endif
00035     };
00036     enum HYS {
00037         NONE    = 0,
00038         HYS5mV  = 1,
00039         HYS10mV = 2,
00040         HYS20mV = 3,
00041     };
00042 
00043     static ACMP *_acmp;
00044 
00045     /** 
00046      * @param ain1 Selects positive voltage input
00047      * @param ain2 Selects negative voltage input
00048      * @param hys Selects hysteresis of the comparator
00049      * @param lad Selects voltage ladder (0-31)
00050      */
00051     ACMP  (VSEL ain1, VSEL ain2, HYS hys = NONE, int lad = -1);
00052 
00053     void isrAcmp ();
00054 
00055     int read ();
00056 
00057     void rise (void(*fptr)() = NULL) {
00058         _rise.attach(fptr);
00059     }
00060     template<typename T>
00061     void rise (T* tptr, void (T::*mptr)()) {
00062         if ((mptr != NULL) && (tptr != NULL)) {
00063             _rise.attach(tptr, mptr);
00064         }
00065     }
00066 
00067     void fall (void(*fptr)() = NULL) {
00068         _fall.attach(fptr);
00069     }
00070     template<typename T>
00071     void fall (T* tptr, void (T::*mptr)()) {
00072         if ((mptr != NULL) && (tptr != NULL)) {
00073             _fall.attach(tptr, mptr);
00074         }
00075     }
00076 
00077 protected:
00078     FunctionPointer _rise, _fall;
00079 
00080 };
00081 
00082 #endif