add (untested) Hamming forward error correction code and corresponding class

The system now uses a FECModem instance, which inherits the receive methods
etc. from Modem.

Up next: Make the modem's buffer read methods private and expose them in
error-corrected FECModem methods instead

1 files changed, 20 insertions, 0 deletions

diff --git a/src/fecmodem.h b/src/fecmodem.h
new file mode 100644
index 0000000..dd36f68
--- /dev/null
+++ b/src/fecmodem.h
@@ -0,0 +1,20 @@
+#include <avr/io.h>
+#include <stdlib.h>
+
+#ifndef FECMODEM_H_
+#define FECMODEM_H_
+
+#include "hamming.h"
+#include "modem.h"
+
+class FECModem : public Modem {
+	private:
+		uint8_t parity128(uint8_t byte);
+		uint8_t parity2416(uint8_t byte1, uint8_t byte2);
+		uint8_t correct128(uint8_t *byte, uint8_t parity);
+		uint8_t hamming2416(uint8_t *byte1, uint8_t *byte2, uint8_t parity);
+};
+
+extern FECModem modem;
+
+#endif /* FECMODEM_H_ */