Diff: USBDevice/USBSERIAL/CircBuffer.h

Revision:

0:22612ae617a0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBSERIAL/CircBuffer.h	Mon Oct 08 11:14:07 2012 +0000
@@ -0,0 +1,51 @@
+#ifndef CIRCBUFFER_H
+#define CIRCBUFFER_H
+
+template <class T>
+class CircBuffer {
+public:
+    CircBuffer(int length) {
+        write = 0;
+        read = 0;
+        size = length + 1;
+        buf = (T *)malloc(size * sizeof(T));
+    };
+
+    bool isFull() {
+        return ((write + 1) % size == read);
+    };
+
+    bool isEmpty() {
+        return (read == write);
+    };
+
+    void queue(T k) {
+        if (isFull()) {
+            read++;
+            read %= size;
+        }
+        buf[write++] = k;
+        write %= size;
+    }
+
+    uint16_t available() {
+        return (write >= read) ? write - read : size - read + write;
+    };
+
+    bool dequeue(T * c) {
+        bool empty = isEmpty();
+        if (!empty) {
+            *c = buf[read++];
+            read %= size;
+        }
+        return(!empty);
+    };
+
+private:
+    volatile uint16_t write;
+    volatile uint16_t read;
+    uint16_t size;
+    T * buf;
+};
+
+#endif