libsigrok/hardware/brymen-dmm/protocol.h

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* 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_BRYMEN_DMM_PROTOCOL_H
#define LIBSIGROK_HARDWARE_BRYMEN_DMM_PROTOCOL_H
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <glib.h>
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#include "libsigrok.h"
#include "libsigrok-internal.h"
/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "brymen-dmm: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
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#define DMM_BUFSIZE 256
enum packet_len_status {
PACKET_HEADER_OK,
PACKET_NEED_MORE_DATA,
PACKET_INVALID_HEADER,
};
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/** Private, per-device-instance driver context. */
struct dev_context {
/** The current sampling limit (in number of samples). */
uint64_t limit_samples;
/** The current sampling limit (in ms). */
uint64_t limit_msec;
/** Opaque pointer passed in by the frontend. */
void *cb_data;
/** The current number of already received samples. */
uint64_t num_samples;
/** Start time of acquisition session */
int64_t starttime;
uint8_t buf[DMM_BUFSIZE];
int bufoffset;
int buflen;
int next_packet_len;
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};
/**
* Callback that assesses the size and status of the incoming packet.
*
* @return PACKET_HEADER_OK - This is a proper packet header.
* PACKET_NEED_MORE_DATA The buffer does not contain the entire header.
* PACKET_INVALID_HEADER Not a valid start of packet.
*/
typedef int (*packet_length_t)(const uint8_t *buf, int *len);
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SR_PRIV int brymen_dmm_receive_data(int fd, int revents, void *cb_data);
SR_PRIV int brymen_packet_request(struct sr_serial_dev_inst *serial);
SR_PRIV int brymen_packet_length(const uint8_t *buf, int *len);
SR_PRIV gboolean brymen_packet_is_valid(const uint8_t *buf);
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SR_PRIV int brymen_stream_detect(struct sr_serial_dev_inst *serial,
uint8_t *buf, size_t *buflen,
packet_length_t get_packet_size,
packet_valid_t is_valid,
uint64_t timeout_ms, int baudrate);
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#endif