USBDevice
Dependents: QEI_X1_LCD_test3 macnica_test
USBSERIAL/CircBuffer.h@0:2d8d0b73e1ff, 2013-04-18 (annotated)
- Committer:
- toucyy
- Date:
- Thu Apr 18 07:49:37 2013 +0000
- Revision:
- 0:2d8d0b73e1ff
[mbed] converted /QEI_HelloWorld/USBDevice
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
toucyy | 0:2d8d0b73e1ff | 1 | #ifndef CIRCBUFFER_H |
toucyy | 0:2d8d0b73e1ff | 2 | #define CIRCBUFFER_H |
toucyy | 0:2d8d0b73e1ff | 3 | |
toucyy | 0:2d8d0b73e1ff | 4 | template <class T> |
toucyy | 0:2d8d0b73e1ff | 5 | class CircBuffer { |
toucyy | 0:2d8d0b73e1ff | 6 | public: |
toucyy | 0:2d8d0b73e1ff | 7 | CircBuffer(int length) { |
toucyy | 0:2d8d0b73e1ff | 8 | write = 0; |
toucyy | 0:2d8d0b73e1ff | 9 | read = 0; |
toucyy | 0:2d8d0b73e1ff | 10 | size = length + 1; |
toucyy | 0:2d8d0b73e1ff | 11 | buf = (T *)malloc(size * sizeof(T)); |
toucyy | 0:2d8d0b73e1ff | 12 | }; |
toucyy | 0:2d8d0b73e1ff | 13 | |
toucyy | 0:2d8d0b73e1ff | 14 | bool isFull() { |
toucyy | 0:2d8d0b73e1ff | 15 | return ((write + 1) % size == read); |
toucyy | 0:2d8d0b73e1ff | 16 | }; |
toucyy | 0:2d8d0b73e1ff | 17 | |
toucyy | 0:2d8d0b73e1ff | 18 | bool isEmpty() { |
toucyy | 0:2d8d0b73e1ff | 19 | return (read == write); |
toucyy | 0:2d8d0b73e1ff | 20 | }; |
toucyy | 0:2d8d0b73e1ff | 21 | |
toucyy | 0:2d8d0b73e1ff | 22 | void queue(T k) { |
toucyy | 0:2d8d0b73e1ff | 23 | if (isFull()) { |
toucyy | 0:2d8d0b73e1ff | 24 | read++; |
toucyy | 0:2d8d0b73e1ff | 25 | read %= size; |
toucyy | 0:2d8d0b73e1ff | 26 | } |
toucyy | 0:2d8d0b73e1ff | 27 | buf[write++] = k; |
toucyy | 0:2d8d0b73e1ff | 28 | write %= size; |
toucyy | 0:2d8d0b73e1ff | 29 | } |
toucyy | 0:2d8d0b73e1ff | 30 | |
toucyy | 0:2d8d0b73e1ff | 31 | uint16_t available() { |
toucyy | 0:2d8d0b73e1ff | 32 | return (write >= read) ? write - read : size - read + write; |
toucyy | 0:2d8d0b73e1ff | 33 | }; |
toucyy | 0:2d8d0b73e1ff | 34 | |
toucyy | 0:2d8d0b73e1ff | 35 | bool dequeue(T * c) { |
toucyy | 0:2d8d0b73e1ff | 36 | bool empty = isEmpty(); |
toucyy | 0:2d8d0b73e1ff | 37 | if (!empty) { |
toucyy | 0:2d8d0b73e1ff | 38 | *c = buf[read++]; |
toucyy | 0:2d8d0b73e1ff | 39 | read %= size; |
toucyy | 0:2d8d0b73e1ff | 40 | } |
toucyy | 0:2d8d0b73e1ff | 41 | return(!empty); |
toucyy | 0:2d8d0b73e1ff | 42 | }; |
toucyy | 0:2d8d0b73e1ff | 43 | |
toucyy | 0:2d8d0b73e1ff | 44 | private: |
toucyy | 0:2d8d0b73e1ff | 45 | volatile uint16_t write; |
toucyy | 0:2d8d0b73e1ff | 46 | volatile uint16_t read; |
toucyy | 0:2d8d0b73e1ff | 47 | uint16_t size; |
toucyy | 0:2d8d0b73e1ff | 48 | T * buf; |
toucyy | 0:2d8d0b73e1ff | 49 | }; |
toucyy | 0:2d8d0b73e1ff | 50 | |
toucyy | 0:2d8d0b73e1ff | 51 | #endif |