Mehrad Arashrad / libmDot

Library for LoRa communication using MultiTech MDOT.

Dependents:   mDot_LoRa_Connect_CSA_Light mDot_LoRa_Connect_CSA_RH_Temp

Fork of libmDot by MultiTech

MTS-Utils/MTSCircularBuffer.h@15:9e811e5a03be, 2016-06-10 (annotated)

Committer:
Mehrad
Date:
Fri Jun 10 00:02:24 2016 +0000
Revision:
15:9e811e5a03be
Parent:
11:9938ba31d428 
Initial Commit

Who changed what in which revision?

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Mike Fiore 1:9f30fbe9e9c1 1 #ifndef MTSCIRCULARBUFFER_H
Mike Fiore 1:9f30fbe9e9c1 2 #define MTSCIRCULARBUFFER_H
Mike Fiore 1:9f30fbe9e9c1 3
Mike Fiore 1:9f30fbe9e9c1 4 #include "Utils.h"
Mike Fiore 1:9f30fbe9e9c1 5
Mike Fiore 1:9f30fbe9e9c1 6 namespace mts
Mike Fiore 1:9f30fbe9e9c1 7 {
Mike Fiore 1:9f30fbe9e9c1 8
Mike Fiore 1:9f30fbe9e9c1 9 /** This class provides a circular byte buffer meant for temporary storage
Mike Fiore 1:9f30fbe9e9c1 10 * during IO transactions. It contains many of the common methods you
Mike Fiore 1:9f30fbe9e9c1 11 * would expect from a circular buffer like read, write, and various
Mike Fiore 1:9f30fbe9e9c1 12 * methods for checking the size or status. It should be noted that
Mike Fiore 1:9f30fbe9e9c1 13 * this class does not include any special code for thread safety like
Mike Fiore 1:9f30fbe9e9c1 14 * a lock. In most cases this is not problematic, but is something
Mike Fiore 1:9f30fbe9e9c1 15 * to be aware of.
Mike Fiore 1:9f30fbe9e9c1 16 */
Mike Fiore 1:9f30fbe9e9c1 17 class MTSCircularBuffer
Mike Fiore 1:9f30fbe9e9c1 18 {
Mike Fiore 1:9f30fbe9e9c1 19 public:
Mike Fiore 1:9f30fbe9e9c1 20 /** Creates an MTSCircularBuffer object with the specified static size.
Mike Fiore 1:9f30fbe9e9c1 21 *
Mike Fiore 1:9f30fbe9e9c1 22 * @prarm bufferSize size of the buffer in bytes.
Mike Fiore 1:9f30fbe9e9c1 23 */
Mike Fiore 1:9f30fbe9e9c1 24 MTSCircularBuffer(int bufferSize);
Mike Fiore 1:9f30fbe9e9c1 25
Mike Fiore 1:9f30fbe9e9c1 26 /** Destructs an MTSCircularBuffer object and frees all related resources.
Mike Fiore 1:9f30fbe9e9c1 27 */
Mike Fiore 1:9f30fbe9e9c1 28 ~MTSCircularBuffer();
Mike Fiore 1:9f30fbe9e9c1 29
Mike Fiore 1:9f30fbe9e9c1 30 /** This method enables bulk reads from the buffer. If more data is
Mike Fiore 1:9f30fbe9e9c1 31 * requested then available it simply returns all remaining data within the
Mike Fiore 1:9f30fbe9e9c1 32 * buffer.
Mike Fiore 1:9f30fbe9e9c1 33 *
Mike Fiore 1:9f30fbe9e9c1 34 * @param data the buffer where data read will be added to.
Mike Fiore 1:9f30fbe9e9c1 35 * @param length the amount of data in bytes to be read into the buffer.
Mike Fiore 1:9f30fbe9e9c1 36 * @returns the total number of bytes that were read.
Mike Fiore 1:9f30fbe9e9c1 37 */
Mike Fiore 1:9f30fbe9e9c1 38 int read(char* data, int length);
Mike Fiore 1:9f30fbe9e9c1 39
Mike Fiore 1:9f30fbe9e9c1 40 /** This method reads a single byte from the buffer.
Mike Fiore 1:9f30fbe9e9c1 41 *
Mike Fiore 1:9f30fbe9e9c1 42 * @param data char where the read byte will be stored.
Mike Fiore 1:9f30fbe9e9c1 43 * @returns 1 if byte is read or 0 if no bytes available.
Mike Fiore 1:9f30fbe9e9c1 44 */
Mike Fiore 1:9f30fbe9e9c1 45 int read(char& data);
Mike Fiore 1:9f30fbe9e9c1 46
Mike Fiore 1:9f30fbe9e9c1 47 /** This method enables bulk writes to the buffer. If more data
Mike Fiore 1:9f30fbe9e9c1 48 * is requested to be written then space available the method writes
Mike Fiore 1:9f30fbe9e9c1 49 * as much data as possible and returns the actual amount written.
Mike Fiore 1:9f30fbe9e9c1 50 *
Mike Fiore 1:9f30fbe9e9c1 51 * @param data the byte array to be written.
Mike Fiore 1:9f30fbe9e9c1 52 * @param length the length of data to be written from the data paramter.
Mike Fiore 1:9f30fbe9e9c1 53 * @returns the number of bytes written to the buffer, which is 0 if
Mike Fiore 1:9f30fbe9e9c1 54 * the buffer is full.
Mike Fiore 1:9f30fbe9e9c1 55 */
Mike Fiore 1:9f30fbe9e9c1 56 int write(const char* data, int length);
Mike Fiore 1:9f30fbe9e9c1 57
Mike Fiore 1:9f30fbe9e9c1 58 /** This method writes a signle byte as a char to the buffer.
Mike Fiore 1:9f30fbe9e9c1 59 *
Mike Fiore 1:9f30fbe9e9c1 60 * @param data the byte to be written as a char.
Mike Fiore 1:9f30fbe9e9c1 61 * @returns 1 if the byte was written or 0 if the buffer was full.
Mike Fiore 1:9f30fbe9e9c1 62 */
Mike Fiore 1:9f30fbe9e9c1 63 int write(char data);
Mike Fiore 1:9f30fbe9e9c1 64
Mike Fiore 1:9f30fbe9e9c1 65 /** This method is used to setup a callback funtion when the buffer reaches
Mike Fiore 1:9f30fbe9e9c1 66 * a certain threshold. The threshold condition is checked after every read
Mike Fiore 1:9f30fbe9e9c1 67 * and write call is completed. The condition is made up of both a threshold
Mike Fiore 1:9f30fbe9e9c1 68 * value and operator. An example that would trigger a callback is if the
Mike Fiore 1:9f30fbe9e9c1 69 * threshold was 10, the operator GREATER, and there were 12 bytes added to an
Mike Fiore 1:9f30fbe9e9c1 70 * empty buffer.
Mike Fiore 1:9f30fbe9e9c1 71 *
Mike Fiore 1:9f30fbe9e9c1 72 * @param tptr a pointer to the object to be called when the condition is met.
Mike Fiore 1:9f30fbe9e9c1 73 * @param mptr a pointer to the function within the object to be called when
Mike Fiore 1:9f30fbe9e9c1 74 * the condition is met.
Mike Fiore 1:9f30fbe9e9c1 75 * @param threshold the value in bytes to be used as part of the condition.
Mike Fiore 1:9f30fbe9e9c1 76 * @param op the operator to be used in conjunction with the threshold
Mike Fiore 1:9f30fbe9e9c1 77 * as part of the condition.
Mike Fiore 1:9f30fbe9e9c1 78 */
Mike Fiore 1:9f30fbe9e9c1 79 template<typename T>
Mike Fiore 1:9f30fbe9e9c1 80 void attach(T *tptr, void( T::*mptr)(void), int threshold, RelationalOperator op) {
Mike Fiore 1:9f30fbe9e9c1 81 _threshold = threshold;
Mike Fiore 1:9f30fbe9e9c1 82 _op = op;
Mike Fiore 1:9f30fbe9e9c1 83 notify.attach(tptr, mptr);
Mike Fiore 1:9f30fbe9e9c1 84 }
Mike Fiore 1:9f30fbe9e9c1 85
Mike Fiore 1:9f30fbe9e9c1 86 /** This method is used to setup a callback funtion when the buffer reaches
Mike Fiore 1:9f30fbe9e9c1 87 * a certain threshold. The threshold condition is checked after every read
Mike Fiore 1:9f30fbe9e9c1 88 * and write call is completed. The condition is made up of both a threshold
Mike Fiore 1:9f30fbe9e9c1 89 * value and operator. An example that would trigger a callback is if the
Mike Fiore 1:9f30fbe9e9c1 90 * threshold was 10, the operator GREATER, and there were 12 bytes added to an
Mike Fiore 1:9f30fbe9e9c1 91 * empty buffer.
Mike Fiore 1:9f30fbe9e9c1 92 *
Mike Fiore 1:9f30fbe9e9c1 93 * @param fptr a pointer to the static function to be called when the condition
Mike Fiore 1:9f30fbe9e9c1 94 * is met.
Mike Fiore 1:9f30fbe9e9c1 95 * @param threshold the value in bytes to be used as part of the condition.
Mike Fiore 1:9f30fbe9e9c1 96 * @param op the operator to be used in conjunction with the threshold
Mike Fiore 1:9f30fbe9e9c1 97 * as part of the condition.
Mike Fiore 1:9f30fbe9e9c1 98 */
Mike Fiore 1:9f30fbe9e9c1 99 void attach(void(*fptr)(void), int threshold, RelationalOperator op) {
Mike Fiore 1:9f30fbe9e9c1 100 _threshold = threshold;
Mike Fiore 1:9f30fbe9e9c1 101 _op = op;
Mike Fiore 1:9f30fbe9e9c1 102 notify.attach(fptr);
Mike Fiore 1:9f30fbe9e9c1 103 }
Mike Fiore 1:9f30fbe9e9c1 104
Mike Fiore 1:9f30fbe9e9c1 105 /** This method returns the size of the storage space currently allocated for
Mike Fiore 1:9f30fbe9e9c1 106 * the buffer. This value is equivalent to the one passed into the constructor.
Mike Fiore 1:9f30fbe9e9c1 107 * This value is equal or greater than the size() of the buffer.
Mike Fiore 1:9f30fbe9e9c1 108 *
Mike Fiore 1:9f30fbe9e9c1 109 * @returns the allocated size of the buffer in bytes.
Mike Fiore 1:9f30fbe9e9c1 110 */
Mike Fiore 1:9f30fbe9e9c1 111 int capacity();
Mike Fiore 1:9f30fbe9e9c1 112
Mike Fiore 1:9f30fbe9e9c1 113 /** This method returns the amount of space left for writing.
Mike Fiore 1:9f30fbe9e9c1 114 *
Mike Fiore 1:9f30fbe9e9c1 115 * @returns numbers of unused bytes in buffer.
Mike Fiore 1:9f30fbe9e9c1 116 */
Mike Fiore 1:9f30fbe9e9c1 117 int remaining();
Mike Fiore 1:9f30fbe9e9c1 118
Mike Fiore 1:9f30fbe9e9c1 119 /** This method returns the number of bytes available for reading.
Mike Fiore 1:9f30fbe9e9c1 120 *
Mike Fiore 1:9f30fbe9e9c1 121 * @returns number of bytes currently in buffer.
Mike Fiore 1:9f30fbe9e9c1 122 */
Mike Fiore 1:9f30fbe9e9c1 123 int size();
Mike Fiore 1:9f30fbe9e9c1 124
Mike Fiore 1:9f30fbe9e9c1 125 /** This method returns whether the buffer is full.
Mike Fiore 1:9f30fbe9e9c1 126 *
Mike Fiore 1:9f30fbe9e9c1 127 * @returns true if full, otherwise false.
Mike Fiore 1:9f30fbe9e9c1 128 */
Mike Fiore 1:9f30fbe9e9c1 129 bool isFull();
Mike Fiore 1:9f30fbe9e9c1 130
Mike Fiore 1:9f30fbe9e9c1 131 /** This method returns whether the buffer is empty.
Mike Fiore 1:9f30fbe9e9c1 132 *
Mike Fiore 1:9f30fbe9e9c1 133 * @returns true if empty, otherwise false.
Mike Fiore 1:9f30fbe9e9c1 134 */
Mike Fiore 1:9f30fbe9e9c1 135 bool isEmpty();
Mike Fiore 1:9f30fbe9e9c1 136
Mike Fiore 1:9f30fbe9e9c1 137 /** This method clears the buffer. This is done through
Mike Fiore 1:9f30fbe9e9c1 138 * setting the internal read and write indexes to the same
Mike Fiore 1:9f30fbe9e9c1 139 * value and is therefore not an expensive operation.
Mike Fiore 1:9f30fbe9e9c1 140 */
Mike Fiore 1:9f30fbe9e9c1 141 void clear();
Mike Fiore 1:9f30fbe9e9c1 142
Mike Fiore 1:9f30fbe9e9c1 143
Mike Fiore 1:9f30fbe9e9c1 144 private:
Mike Fiore 1:9f30fbe9e9c1 145 int bufferSize; // total size of the buffer
Mike Fiore 1:9f30fbe9e9c1 146 char* buffer; // internal byte buffer as a character buffer
Mike Fiore 1:9f30fbe9e9c1 147 int readIndex; // read index for circular buffer
Mike Fiore 1:9f30fbe9e9c1 148 int writeIndex; // write index for circular buffer
Mike Fiore 1:9f30fbe9e9c1 149 int bytes; // available data
Mike Fiore 1:9f30fbe9e9c1 150 FunctionPointer notify; // function pointer used for the internal callback notification
Mike Fiore 1:9f30fbe9e9c1 151 int _threshold; // threshold for the notification
Mike Fiore 1:9f30fbe9e9c1 152 RelationalOperator _op; // operator that determines the direction of the threshold
Mike Fiore 1:9f30fbe9e9c1 153 void checkThreshold(); // private function that checks thresholds and processes notifications
Mike Fiore 1:9f30fbe9e9c1 154 };
Mike Fiore 1:9f30fbe9e9c1 155
Mike Fiore 1:9f30fbe9e9c1 156 }
Mike Fiore 1:9f30fbe9e9c1 157
Mike Fiore 1:9f30fbe9e9c1 158 #endif /* MTSCIRCULARBUFFER_H */