Initial commit of fifo and i2c headers

i2cspi_BaS_gcc/include/fifo.h

@@ -0,0 +1,39 @@
+/*
+ * This is taken from general implementations
+ * on the internet, and definately needs some
+ * work.
+ *
+ * good enough for now.
+ *
+ */
+
+#ifndef FIREBEE_FIFO
+#define FIREBEE_FIFO
+
+#include <inttypes.h>
+
+typedef struct {
+     char * buf;
+     int head;
+     int tail;
+     int size;
+} fifo_t;
+
+void fifo_init(fifo_t*,char*,int);
+void fifo_advance(fifo_t*,int*);
+
+uint8_t fifo_get(fifo_t*);
+void fifo_put(fifo_t*,uint8_t);
+
+void fifo_clear(fifo_t*);
+
+int fifo_used(fifo_t*);
+int fifo_unused(fifo_t*);
+
+int fifo_full(fifo_t*);
+int fifo_empty(fifo_t*);
+
+int fifo_read(fifo_t*,char *,int);
+int fifo_write(fifo_t*,const char*,int);
+
+#endif