MP1 protocol receive implemented

Modem/protocol/mp1.h

@@ -0,0 +1,43 @@
+#ifndef PROTOCOL_MP1
+#define PROTOCOL_MP1
+
+#include <cfg/compiler.h>
+#include <io/kfile.h>
+
+// Frame sizing
+#define MP1_MIN_FRAME_LENGTH 1
+#define MP1_MAX_FRAME_LENGTH 300
+
+// We need to know some basic HDLC flag bytes
+#define HDLC_FLAG  0x7E
+#define HDLC_RESET 0x7F
+#define AX25_ESC   0x1B
+
+// Just a forward declaration that this struct exists
+struct MP1Packet;
+
+// The type of a callback function for passing
+// back a decoded packet
+typedef void (*mp1_callback_t)(struct MP1Packet *packet);
+
+// Struct for a protocol context
+typedef struct MP1 {
+	uint8_t buffer[MP1_MAX_FRAME_LENGTH];	// A buffer for incoming packets
+	KFile *modem;							// KFile access to the modem
+	size_t packetLength;					// Counter for received packet length
+	mp1_callback_t callback;				// The function to call when a packet has been received
+	bool reading;							// True when we have seen a HDLC flag
+	bool escape;							// We need to know if we are in an escape sequence
+} MP1;
+
+// A struct encapsulating a network packet
+typedef struct MP1Packet {
+	const uint8_t *data;					// Pointer to the actual data in the packet
+	size_t dataLength;						// The length of the received data
+} MP1Packet;
+
+void mp1Init(MP1 *mp1, KFile *modem, mp1_callback_t callback);
+void mp1Poll(MP1 *mp1);
+void mp1Send(MP1 *mp1, const void *_buffer, size_t length);
+
+#endif