Suga koubou
USB CDC (serial) and USB MSC (strage) Composite Device. http://mbed.org/users/okini3939/notebook/USB_Device/
Dependencies: ChaNFSSD mbed ChaNFS
USBDevice/USBSERIAL/CircBuffer.h@2:5db90410bb90, 2011-12-23 (annotated)
- Committer:
- okini3939
- Date:
- Fri Dec 23 16:37:58 2011 +0000
- Revision:
- 2:5db90410bb90
- Parent:
- 0:9b1d17d54055
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| okini3939 | 0:9b1d17d54055 | 1 | #ifndef CIRCBUFFER_H |
| okini3939 | 0:9b1d17d54055 | 2 | #define CIRCBUFFER_H |
| okini3939 | 0:9b1d17d54055 | 3 | |
| okini3939 | 0:9b1d17d54055 | 4 | template <class T> |
| okini3939 | 0:9b1d17d54055 | 5 | class CircBuffer { |
| okini3939 | 0:9b1d17d54055 | 6 | public: |
| okini3939 | 0:9b1d17d54055 | 7 | CircBuffer(int length) { |
| okini3939 | 0:9b1d17d54055 | 8 | write = 0; |
| okini3939 | 0:9b1d17d54055 | 9 | read = 0; |
| okini3939 | 0:9b1d17d54055 | 10 | size = length + 1; |
| okini3939 | 0:9b1d17d54055 | 11 | buf = (T *)malloc(size * sizeof(T)); |
| okini3939 | 0:9b1d17d54055 | 12 | }; |
| okini3939 | 0:9b1d17d54055 | 13 | |
| okini3939 | 0:9b1d17d54055 | 14 | bool isFull() { |
| okini3939 | 0:9b1d17d54055 | 15 | return ((write + 1) % size == read); |
| okini3939 | 0:9b1d17d54055 | 16 | }; |
| okini3939 | 0:9b1d17d54055 | 17 | |
| okini3939 | 0:9b1d17d54055 | 18 | bool isEmpty() { |
| okini3939 | 0:9b1d17d54055 | 19 | return (read == write); |
| okini3939 | 0:9b1d17d54055 | 20 | }; |
| okini3939 | 0:9b1d17d54055 | 21 | |
| okini3939 | 0:9b1d17d54055 | 22 | void queue(T k) { |
| okini3939 | 0:9b1d17d54055 | 23 | if (isFull()) { |
| okini3939 | 0:9b1d17d54055 | 24 | read++; |
| okini3939 | 0:9b1d17d54055 | 25 | read %= size; |
| okini3939 | 0:9b1d17d54055 | 26 | } |
| okini3939 | 0:9b1d17d54055 | 27 | buf[write++] = k; |
| okini3939 | 0:9b1d17d54055 | 28 | write %= size; |
| okini3939 | 0:9b1d17d54055 | 29 | } |
| okini3939 | 0:9b1d17d54055 | 30 | |
| okini3939 | 0:9b1d17d54055 | 31 | uint16_t available() { |
| okini3939 | 0:9b1d17d54055 | 32 | return (write >= read) ? write - read : size - read + write; |
| okini3939 | 0:9b1d17d54055 | 33 | }; |
| okini3939 | 0:9b1d17d54055 | 34 | |
| okini3939 | 0:9b1d17d54055 | 35 | bool dequeue(T * c) { |
| okini3939 | 0:9b1d17d54055 | 36 | bool empty = isEmpty(); |
| okini3939 | 0:9b1d17d54055 | 37 | if (!empty) { |
| okini3939 | 0:9b1d17d54055 | 38 | *c = buf[read++]; |
| okini3939 | 0:9b1d17d54055 | 39 | read %= size; |
| okini3939 | 0:9b1d17d54055 | 40 | } |
| okini3939 | 0:9b1d17d54055 | 41 | return(!empty); |
| okini3939 | 0:9b1d17d54055 | 42 | }; |
| okini3939 | 0:9b1d17d54055 | 43 | |
| okini3939 | 0:9b1d17d54055 | 44 | private: |
| okini3939 | 0:9b1d17d54055 | 45 | volatile uint16_t write; |
| okini3939 | 0:9b1d17d54055 | 46 | volatile uint16_t read; |
| okini3939 | 0:9b1d17d54055 | 47 | uint16_t size; |
| okini3939 | 0:9b1d17d54055 | 48 | T * buf; |
| okini3939 | 0:9b1d17d54055 | 49 | }; |
| okini3939 | 0:9b1d17d54055 | 50 | |
| okini3939 | 0:9b1d17d54055 | 51 | #endif |