gcc4mbed/samples/MSTest/USBDevice/USBSERIAL/CircBuffer.h

   1 #ifndef CIRCBUFFER_H
   2 #define CIRCBUFFER_H
   3
   4 template <class T>
   5 class CircBuffer {
   6 public:
   7     CircBuffer(int length) {
   8         write = 0;
   9         read = 0;
  10         size = length + 1;
  11         buf = (T *)malloc(size * sizeof(T));
  12     };
  13
  14     bool isFull() {
  15         return ((write + 1) % size == read);
  16     };
  17
  18     bool isEmpty() {
  19         return (read == write);
  20     };
  21
  22     void queue(T k) {
  23         if (isFull()) {
  24             read++;
  25             read %= size;
  26         }
  27         buf[write++] = k;
  28         write %= size;
  29     }
  30
  31     uint16_t available() {
  32         return (write >= read) ? write - read : size - read + write;
  33     };
  34
  35     bool dequeue(T * c) {
  36         bool empty = isEmpty();
  37         if (!empty) {
  38             *c = buf[read++];
  39             read %= size;
  40         }
  41         return(!empty);
  42     };
  43
  44 private:
  45     volatile uint16_t write;
  46     volatile uint16_t read;
  47     uint16_t size;
  48     T * buf;
  49 };
  50
  51 #endif