Diff: ImgBuffer.h

Revision:

0:27e403b8981e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ImgBuffer.h	Sat Apr 28 21:09:44 2012 +0000
@@ -0,0 +1,54 @@
+#ifndef IMGBUFFER_H
+#define IMGBUFFER_H
+
+#define MAX_IMG_BUF 1024
+
+class ImgBuffer {
+public:
+    ImgBuffer() {
+        write = 0;
+        read = 0;
+        size = MAX_IMG_BUF + 1;
+    };
+
+    bool isFull() {
+        return ((write + 1) % size == read);
+    };
+
+    bool isEmpty() {
+        return (read == write);
+    };
+
+    void queue(uint8_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(uint8_t * c) {
+        if (!isEmpty()) {
+            *c = buf[read++];
+            read %= size;
+        }
+        return(!isEmpty());
+    };
+
+   void clear() {
+       read = write;
+   };
+
+private:
+    volatile uint16_t write;
+    volatile uint16_t read;
+    uint16_t size;
+    uint8_t buf[MAX_IMG_BUF + 1];
+};
+
+#endif
\ No newline at end of file