Adam Resnick / CNCAirbrush

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Dependents:   CNCAirbrushCode

ImgBuffer.h@0:27e403b8981e, 2012-04-28 (annotated)

Committer:
stretch
Date:
Sat Apr 28 21:09:44 2012 +0000
Revision:
0:27e403b8981e
Initial Public Release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stretch 0:27e403b8981e 1 #ifndef IMGBUFFER_H
stretch 0:27e403b8981e 2 #define IMGBUFFER_H
stretch 0:27e403b8981e 3
stretch 0:27e403b8981e 4 #define MAX_IMG_BUF 1024
stretch 0:27e403b8981e 5
stretch 0:27e403b8981e 6 class ImgBuffer {
stretch 0:27e403b8981e 7 public:
stretch 0:27e403b8981e 8 ImgBuffer() {
stretch 0:27e403b8981e 9 write = 0;
stretch 0:27e403b8981e 10 read = 0;
stretch 0:27e403b8981e 11 size = MAX_IMG_BUF + 1;
stretch 0:27e403b8981e 12 };
stretch 0:27e403b8981e 13
stretch 0:27e403b8981e 14 bool isFull() {
stretch 0:27e403b8981e 15 return ((write + 1) % size == read);
stretch 0:27e403b8981e 16 };
stretch 0:27e403b8981e 17
stretch 0:27e403b8981e 18 bool isEmpty() {
stretch 0:27e403b8981e 19 return (read == write);
stretch 0:27e403b8981e 20 };
stretch 0:27e403b8981e 21
stretch 0:27e403b8981e 22 void queue(uint8_t k) {
stretch 0:27e403b8981e 23 if (isFull()) {
stretch 0:27e403b8981e 24 read++;
stretch 0:27e403b8981e 25 read %= size;
stretch 0:27e403b8981e 26 }
stretch 0:27e403b8981e 27 buf[write++] = k;
stretch 0:27e403b8981e 28 write %= size;
stretch 0:27e403b8981e 29 }
stretch 0:27e403b8981e 30
stretch 0:27e403b8981e 31 uint16_t available() {
stretch 0:27e403b8981e 32 return (write >= read) ? write - read : size - read + write;
stretch 0:27e403b8981e 33 };
stretch 0:27e403b8981e 34
stretch 0:27e403b8981e 35 bool dequeue(uint8_t * c) {
stretch 0:27e403b8981e 36 if (!isEmpty()) {
stretch 0:27e403b8981e 37 *c = buf[read++];
stretch 0:27e403b8981e 38 read %= size;
stretch 0:27e403b8981e 39 }
stretch 0:27e403b8981e 40 return(!isEmpty());
stretch 0:27e403b8981e 41 };
stretch 0:27e403b8981e 42
stretch 0:27e403b8981e 43 void clear() {
stretch 0:27e403b8981e 44 read = write;
stretch 0:27e403b8981e 45 };
stretch 0:27e403b8981e 46
stretch 0:27e403b8981e 47 private:
stretch 0:27e403b8981e 48 volatile uint16_t write;
stretch 0:27e403b8981e 49 volatile uint16_t read;
stretch 0:27e403b8981e 50 uint16_t size;
stretch 0:27e403b8981e 51 uint8_t buf[MAX_IMG_BUF + 1];
stretch 0:27e403b8981e 52 };
stretch 0:27e403b8981e 53
stretch 0:27e403b8981e 54 #endif