1 files changed, 47 insertions, 0 deletions
diff --git a/arduino/ace/framing.h b/arduino/ace/framing.h
new file mode 100644
index 0000000..daacba7
--- /dev/null
+++ b/arduino/ace/framing.h
@@ -0,0 +1,47 @@
+#ifndef FRAMING_H
+#define FRAMING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <inttypes.h>
+
+#define MAX_FRAME_SIZE 128
+#define FRAME_ESCAPE 0x02
+#define FRAME_START 0x03
+#define FRAME_STOP 0x10
+
+typedef enum {
+  WAITING,
+  RECEIVING,
+  ESCAPING
+} link_state;
+
+typedef void (*receive_frame_function)(int16_t size, uint8_t* data);
+typedef void (*send_byte_function)(uint8_t byte);
+
+
+typedef struct {
+  link_state state; // current state
+  uint8_t buffer[MAX_FRAME_SIZE]; // in data buffer
+  uint8_t staged; // previously read byte, will be put in buffer after next read
+  int16_t position; //current position of next byte to be read in buffer
+  uint8_t checksum; //current value of calculated checksum
+  
+  receive_frame_function receiver;
+  send_byte_function sender;
+  
+} framer;
+
+void init_framer(framer* f);
+void receive_byte(framer* f, uint8_t byte);
+void send_frame(framer* f, int16_t size, const uint8_t * const data_out);
+
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif /* FRAMING_H */