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diff --git a/src/hardware/mastech-ms6514/protocol.h b/src/hardware/mastech-ms6514/protocol.h
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+++ b/src/hardware/mastech-ms6514/protocol.h
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+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2019 Dave Buechi <db@pflutsch.ch>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBSIGROK_HARDWARE_MASTECH_MS6514_PROTOCOL_H
+#define LIBSIGROK_HARDWARE_MASTECH_MS6514_PROTOCOL_H
+
+#include <stdint.h>
+#include <glib.h>
+#include <libsigrok/libsigrok.h>
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "mastech-ms6514"
+
+#define MASTECH_MS6514_NUM_CHANNELS	2
+#define MASTECH_MS6514_BUF_SIZE		(3 * 18)
+#define MASTECH_MS6514_FRAME_SIZE 	18
+#define DEFAULT_DATA_SOURCE		DATA_SOURCE_LIVE
+
+enum mastech_ms6614_data_source {
+	DATA_SOURCE_LIVE,
+	DATA_SOURCE_MEMORY,
+};
+
+enum mastech_ms6614_command {
+	CMD_GET_STORED = 0xA1
+};
+
+struct dev_context {
+	struct sr_sw_limits limits;
+	enum mastech_ms6614_data_source data_source;
+	unsigned int buf_len;
+	uint8_t buf[MASTECH_MS6514_BUF_SIZE];
+	unsigned int log_buf_len;
+};
+
+SR_PRIV int mastech_ms6514_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV gboolean mastech_ms6514_packet_valid(const uint8_t *buf);
+
+#endif