12-polyphonic "chiptune" MIDI synthesizer for LPC1768 (Standalone version)
Dependencies: ClockControl PowerControl mbed
RingBuffer.h@6:cda45a5e723e, 2014-12-23 (annotated)
- Committer:
- kayekss
- Date:
- Tue Dec 23 21:50:53 2014 +0000
- Revision:
- 6:cda45a5e723e
- Parent:
- 0:727737138ac5
Supports "Panic on offline" feature when using MIDI-port input
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kayekss | 0:727737138ac5 | 1 | #ifndef RINGBUFFER_H_ |
kayekss | 0:727737138ac5 | 2 | #define RINGBUFFER_H_ |
kayekss | 0:727737138ac5 | 3 | |
kayekss | 0:727737138ac5 | 4 | #include <stdint.h> |
kayekss | 0:727737138ac5 | 5 | |
kayekss | 0:727737138ac5 | 6 | template <class T> |
kayekss | 0:727737138ac5 | 7 | class RingBuffer { |
kayekss | 0:727737138ac5 | 8 | private: |
kayekss | 0:727737138ac5 | 9 | uint32_t readPos; |
kayekss | 0:727737138ac5 | 10 | uint32_t writePos; |
kayekss | 0:727737138ac5 | 11 | uint32_t itemCount; |
kayekss | 0:727737138ac5 | 12 | uint32_t length; |
kayekss | 0:727737138ac5 | 13 | T* buffer; |
kayekss | 0:727737138ac5 | 14 | |
kayekss | 0:727737138ac5 | 15 | public: |
kayekss | 0:727737138ac5 | 16 | RingBuffer(uint32_t); |
kayekss | 0:727737138ac5 | 17 | ~RingBuffer(); |
kayekss | 0:727737138ac5 | 18 | bool isWritable(); |
kayekss | 0:727737138ac5 | 19 | bool isReadable(); |
kayekss | 0:727737138ac5 | 20 | bool write(T&); |
kayekss | 0:727737138ac5 | 21 | T* read(); |
kayekss | 0:727737138ac5 | 22 | T* peek(); |
kayekss | 0:727737138ac5 | 23 | void flush(); |
kayekss | 0:727737138ac5 | 24 | int find(T); |
kayekss | 0:727737138ac5 | 25 | |
kayekss | 0:727737138ac5 | 26 | uint32_t getItemCount(); |
kayekss | 0:727737138ac5 | 27 | }; |
kayekss | 0:727737138ac5 | 28 | |
kayekss | 0:727737138ac5 | 29 | template <class T> |
kayekss | 0:727737138ac5 | 30 | RingBuffer<T>::RingBuffer(uint32_t len) { |
kayekss | 0:727737138ac5 | 31 | length = len; |
kayekss | 0:727737138ac5 | 32 | buffer = new T[length]; |
kayekss | 0:727737138ac5 | 33 | readPos = 0; |
kayekss | 0:727737138ac5 | 34 | writePos = 0; |
kayekss | 0:727737138ac5 | 35 | itemCount = 0; |
kayekss | 0:727737138ac5 | 36 | } |
kayekss | 0:727737138ac5 | 37 | |
kayekss | 0:727737138ac5 | 38 | template <class T> |
kayekss | 0:727737138ac5 | 39 | RingBuffer<T>::~RingBuffer() { |
kayekss | 0:727737138ac5 | 40 | delete[] buffer; |
kayekss | 0:727737138ac5 | 41 | } |
kayekss | 0:727737138ac5 | 42 | |
kayekss | 0:727737138ac5 | 43 | template <class T> |
kayekss | 0:727737138ac5 | 44 | bool RingBuffer<T>::isWritable() { |
kayekss | 0:727737138ac5 | 45 | return itemCount < length; |
kayekss | 0:727737138ac5 | 46 | } |
kayekss | 0:727737138ac5 | 47 | |
kayekss | 0:727737138ac5 | 48 | template <class T> |
kayekss | 0:727737138ac5 | 49 | bool RingBuffer<T>::isReadable() { |
kayekss | 0:727737138ac5 | 50 | return itemCount > 0; |
kayekss | 0:727737138ac5 | 51 | } |
kayekss | 0:727737138ac5 | 52 | |
kayekss | 0:727737138ac5 | 53 | template <class T> |
kayekss | 0:727737138ac5 | 54 | bool RingBuffer<T>::write(T& n) { |
kayekss | 0:727737138ac5 | 55 | if (!isWritable()) { |
kayekss | 0:727737138ac5 | 56 | return false; |
kayekss | 0:727737138ac5 | 57 | } |
kayekss | 0:727737138ac5 | 58 | buffer[writePos++] = n; |
kayekss | 0:727737138ac5 | 59 | if (writePos == length) { |
kayekss | 0:727737138ac5 | 60 | writePos = 0; |
kayekss | 0:727737138ac5 | 61 | } |
kayekss | 0:727737138ac5 | 62 | itemCount++; |
kayekss | 0:727737138ac5 | 63 | return true; |
kayekss | 0:727737138ac5 | 64 | } |
kayekss | 0:727737138ac5 | 65 | |
kayekss | 0:727737138ac5 | 66 | template <class T> |
kayekss | 0:727737138ac5 | 67 | T* RingBuffer<T>::read() { |
kayekss | 0:727737138ac5 | 68 | uint32_t readPosTemp = readPos; |
kayekss | 0:727737138ac5 | 69 | |
kayekss | 0:727737138ac5 | 70 | if (!isReadable()) { |
kayekss | 0:727737138ac5 | 71 | return NULL; |
kayekss | 0:727737138ac5 | 72 | } |
kayekss | 0:727737138ac5 | 73 | readPos++; |
kayekss | 0:727737138ac5 | 74 | if (readPos == length) { |
kayekss | 0:727737138ac5 | 75 | readPos = 0; |
kayekss | 0:727737138ac5 | 76 | } |
kayekss | 0:727737138ac5 | 77 | itemCount--; |
kayekss | 0:727737138ac5 | 78 | return &buffer[readPosTemp]; |
kayekss | 0:727737138ac5 | 79 | } |
kayekss | 0:727737138ac5 | 80 | |
kayekss | 0:727737138ac5 | 81 | template <class T> |
kayekss | 0:727737138ac5 | 82 | T* RingBuffer<T>::peek() { |
kayekss | 0:727737138ac5 | 83 | if (!isReadable()) { |
kayekss | 0:727737138ac5 | 84 | return NULL; |
kayekss | 0:727737138ac5 | 85 | } |
kayekss | 0:727737138ac5 | 86 | return &buffer[readPos]; |
kayekss | 0:727737138ac5 | 87 | } |
kayekss | 0:727737138ac5 | 88 | |
kayekss | 0:727737138ac5 | 89 | template <class T> |
kayekss | 0:727737138ac5 | 90 | void RingBuffer<T>::flush() { |
kayekss | 0:727737138ac5 | 91 | itemCount = 0; |
kayekss | 0:727737138ac5 | 92 | readPos = writePos; |
kayekss | 0:727737138ac5 | 93 | } |
kayekss | 0:727737138ac5 | 94 | |
kayekss | 0:727737138ac5 | 95 | template <class T> |
kayekss | 0:727737138ac5 | 96 | int RingBuffer<T>::find(T key) { |
kayekss | 0:727737138ac5 | 97 | uint32_t p = readPos; |
kayekss | 0:727737138ac5 | 98 | |
kayekss | 0:727737138ac5 | 99 | for (uint32_t i = 0; i < itemCount; i++) { |
kayekss | 0:727737138ac5 | 100 | if (buffer[p] == key) { |
kayekss | 0:727737138ac5 | 101 | return i; |
kayekss | 0:727737138ac5 | 102 | } |
kayekss | 0:727737138ac5 | 103 | p++; |
kayekss | 0:727737138ac5 | 104 | if (p == length) p = 0; |
kayekss | 0:727737138ac5 | 105 | } |
kayekss | 0:727737138ac5 | 106 | return -1; |
kayekss | 0:727737138ac5 | 107 | } |
kayekss | 0:727737138ac5 | 108 | |
kayekss | 0:727737138ac5 | 109 | template <class T> |
kayekss | 0:727737138ac5 | 110 | uint32_t RingBuffer<T>::getItemCount() { |
kayekss | 0:727737138ac5 | 111 | return this->itemCount; |
kayekss | 0:727737138ac5 | 112 | } |
kayekss | 0:727737138ac5 | 113 | |
kayekss | 0:727737138ac5 | 114 | #endif |