95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBSIGROK_HARDWARE_BRYMEN_DMM_PROTOCOL_H
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#define LIBSIGROK_HARDWARE_BRYMEN_DMM_PROTOCOL_H
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/* Message logging helpers with driver-specific prefix string. */
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#define DRIVER_LOG_DOMAIN "brymen-dmm: "
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#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
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#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
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#define DMM_BUFSIZE 256
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enum packet_len_status {
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PACKET_HEADER_OK,
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PACKET_NEED_MORE_DATA,
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PACKET_INVALID_HEADER,
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};
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/** Private, per-device-instance driver context. */
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struct dev_context {
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/** The current sampling limit (in number of samples). */
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uint64_t limit_samples;
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/** The current sampling limit (in ms). */
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uint64_t limit_msec;
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/** Opaque pointer passed in by the frontend. */
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void *cb_data;
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/** The current number of already received samples. */
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uint64_t num_samples;
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/** Start time of acquisition session */
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int64_t starttime;
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struct sr_serial_dev_inst *serial;
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uint8_t buf[DMM_BUFSIZE];
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int bufoffset;
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int buflen;
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int next_packet_len;
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};
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/**
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* Callback that assesses the size and status of the incoming packet.
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*
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* @return PACKET_HEADER_OK - This is a proper packet header.
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* PACKET_NEED_MORE_DATA The buffer does not contain the entire header.
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* PACKET_INVALID_HEADER Not a valid start of packet.
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*/
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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);
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SR_PRIV int brymen_packet_request(struct sr_serial_dev_inst *serial);
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SR_PRIV int brymen_packet_length(const uint8_t *buf, int *len);
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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,
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uint8_t *buf, size_t *buflen,
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packet_length_t get_packet_size,
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packet_valid_t is_valid,
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uint64_t timeout_ms, int baudrate);
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#endif
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