Initial commit

circ_buf.c

@@ -0,0 +1,33 @@
+#include "circ_buf.h"
+
+void buffer_init(volatile circular_buffer_t* b){
+    b->count = 0;
+    b->head = 0;
+    b->tail = 0;
+}
+
+uint8_t buffer_is_full(volatile circular_buffer_t* b){
+    return b->count == BUFFER_SIZE;
+}
+
+uint8_t buffer_is_empty(volatile circular_buffer_t* b){
+    return b->count == 0;
+}
+
+uint8_t buffer_enqueue(volatile circular_buffer_t* b, char c){
+    if(buffer_is_full(b))
+        return 0;
+    b->data[b->head] = c;
+    b->head = (b->head+1)%BUFFER_SIZE;
+    b->count++;
+    return 1;
+}
+
+uint8_t buffer_dequeue(volatile circular_buffer_t* b, char* c){
+    if(buffer_is_empty(b))
+        return 0;
+    *c = b->data[b->tail];
+    b->tail = (b->tail+1)%BUFFER_SIZE;
+    b->count--;
+    return 1;
+}