dmm/bm85x: introduce DMM packet parser for Brymen BM850(a/s)
Implement a DMM packet parser for the BM850s protocol. This involves variable length responses, which recently became a common serial-dmm feature. Register the new parser under the "brymen-bm85x" device name. This obsoletes the brymen-dmm driver which announces as "brymen-bm857". This implementation was tested with the BM859s meter. The text to number conversion with precision detection resolves the last remaining issue of bug #1611.
This commit is contained in:
Gerhard Sittig
parent
91ab2f6475
commit
27186edacf
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@ -166,6 +166,7 @@ libsigrok_la_SOURCES += \
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src/dmm/asycii.c \
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src/dmm/bm25x.c \
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src/dmm/bm52x.c \
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src/dmm/bm85x.c \
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src/dmm/bm86x.c \
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src/dmm/dtm0660.c \
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src/dmm/eev121gw.c \
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@ -0,0 +1,457 @@
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/*
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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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* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
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* Copyright (C) 2019-2020 Gerhard Sittig <gerhard.sittig@gmx.net>
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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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/**
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* @file
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*
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* Protocol parser for Brymen BM850s DMM packets. The USB protocol (for the
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* cable) and the packet description (for the meter) were retrieved from:
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* http://brymen.com/product-html/Download2.html
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* http://brymen.com/product-html/PD02BM850s_protocolDL.html
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* http://brymen.com/product-html/images/DownloadList/ProtocolList/BM850-BM850a-BM850s_List/BM850-BM850a-BM850s-500000-count-DMM-protocol-BC85X-BC85Xa.zip
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*
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* Implementor's notes on the protocol:
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* - The BM85x devices require a low RTS pulse after COM port open and
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* before communication of requests and responses. The vendor doc
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* recommends 100ms pulse width including delays around it. Without
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* that RTS pulse the meter won't respond to requests.
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* - The request has a three byte header (DLE, STX, command code), two
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* bytes command arguments, and three bytes tail (checksum, DLE, ETX).
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* The checksum spans the area (including) the command code and args.
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* The checksum value is the XOR across all payload bytes. Exclusively
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* command 0x00 is used (initiate next measurement response) which does
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* not need arguments (passes all-zero values).
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* - The response has a four byte header (DLE, STX, command code, payload
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* size), the respective number of payload data bytes, and a three byte
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* tail (checksum, DLE, ETX). The checksum spans the range after the
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* length field and before the checksum field. Command 0 response data
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* payload consists of a four byte flags field and a text field for
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* measurement values (floating point with exponent in ASCII).
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* - Special cases of response data:
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* - The text field which carries the measurement value also contains
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* whitespace which may break simple text to number conversion. Like
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* 10 02 00 0f 07 00 00 00 20 30 2e 30 30 33 32 20 45 2b 30 46 10 03
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* which translates to: 07 00 00 00 " 0.0032 E+0". Text for overload
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* conditions can be shorter which results in variable packet length.
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* Some meter functions provide unexpected text for their values.
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* - The reference impedance for decibel measurements looks wrong and
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* requires special treatment to isolate the 4..1200R value:
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* bfunc 80 20 00 00, text " 0. 800 E+1" (reference, 800R)
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* The decibel measurement values use an unexpected scale.
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* bfunc 00 20 00 00, text "-0.3702 E-1" (measurement, -37.02dBm)
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* The reference value gets sent (sometimes) in a DMM response when
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* the meter's function is entered, or the reference value changes.
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* The 'bfunc' flags combination allows telling packet types apart.
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* - Temperature measurements put the C/F unit between the mantissa
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* and the exponent, which needs to get removed: " 0.0217CE+3"
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* - Diode measurements appear to exclusively provide the 'Volt' flag
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* but no 'Diode' flag. The display shows ".diod" for a moment but
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* this information is no longer available when voltage measurements
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* are seen.
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*/
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#include <config.h>
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#include <ctype.h>
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#include <math.h>
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#include <libsigrok/libsigrok.h>
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#include "libsigrok-internal.h"
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#include <string.h>
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#define LOG_PREFIX "brymen-bm85x"
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#define STX 0x02
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#define ETX 0x03
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#define DLE 0x10
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#define CMD_GET_READING 0
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#define PKT_HEAD_LEN 4
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#define PKT_DATA_MAX 15
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#define PKT_TAIL_LEN 3
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#define PKT_BFUNC_LEN 4
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static uint8_t bm85x_crc(const uint8_t *buf, size_t len)
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{
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uint8_t crc;
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crc = 0;
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while (len--)
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crc ^= *buf++;
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return crc;
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}
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#ifdef HAVE_SERIAL_COMM
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/** Meter's specific activity after port open and before data exchange. */
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SR_PRIV int brymen_bm85x_after_open(struct sr_serial_dev_inst *serial)
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{
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int rts_toggle_delay_us;
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/*
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* The device requires an RTS *pulse* before communication.
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* The vendor's documentation recommends the following sequence:
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* Open the COM port, wait for 100ms, set RTS=1, wait for 100ms,
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* set RTS=0, wait for 100ms, set RTS=1, configure bitrate and
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* frame format, transmit request data, receive response data.
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*/
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rts_toggle_delay_us = 100 * 1000; /* 100ms */
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g_usleep(rts_toggle_delay_us);
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serial_set_handshake(serial, 1, -1);
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g_usleep(rts_toggle_delay_us);
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serial_set_handshake(serial, 0, -1);
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g_usleep(rts_toggle_delay_us);
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serial_set_handshake(serial, 1, -1);
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g_usleep(rts_toggle_delay_us);
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return SR_OK;
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}
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static int bm85x_send_command(struct sr_serial_dev_inst *serial,
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uint8_t cmd, uint8_t arg1, uint8_t arg2)
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{
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uint8_t buf[8];
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uint8_t crc, *wrptr, *crcptr;
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size_t wrlen;
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int ret;
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wrptr = &buf[0];
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write_u8_inc(&wrptr, DLE);
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write_u8_inc(&wrptr, STX);
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crcptr = wrptr;
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write_u8_inc(&wrptr, cmd);
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write_u8_inc(&wrptr, arg1);
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write_u8_inc(&wrptr, arg2);
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crc = bm85x_crc(crcptr, wrptr - crcptr);
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write_u8_inc(&wrptr, crc);
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write_u8_inc(&wrptr, DLE);
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write_u8_inc(&wrptr, ETX);
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wrlen = wrptr - &buf[0];
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ret = serial_write_nonblocking(serial, &buf[0], wrlen);
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if (ret < 0)
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return ret;
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if ((size_t)ret != wrlen)
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return SR_ERR_IO;
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return SR_OK;
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}
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/** Initiate reception of another meter's reading. */
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SR_PRIV int brymen_bm85x_packet_request(struct sr_serial_dev_inst *serial)
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{
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return bm85x_send_command(serial, CMD_GET_READING, 0, 0);
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}
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#endif
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/**
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* Check Brymen BM85x DMM packet for validity.
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*
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* @param[in] st The DMM driver's internal state.
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* @param[in] buf The data bytes received so far.
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* @param[in] len The received data's length (byte count).
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* @param[out] pkt_len The packet's calculated total size (when valid).
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*
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* The BM850s protocol uses packets of variable length. A minimum amount
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* of RX data provides the packet header, which communicates the payload
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* size, which allows to determine the packet's total size. Callers of
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* this validity checker can learn how much data will get consumed when
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* a valid packet got received and processed. The packet size is not
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* known in advance.
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*
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* @returns SR_OK when the packet is valid.
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* @returns SR_ERR* (below zero) when the packet is invalid.
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* @returns Greater 0 when packet is incomplete, more data is needed.
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*/
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SR_PRIV int brymen_bm85x_packet_valid(void *st,
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const uint8_t *buf, size_t len, size_t *pkt_len)
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{
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size_t plen;
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uint8_t cmd, crc;
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(void)st;
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/* Four header bytes: DLE, STX, command, payload length. */
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if (len < PKT_HEAD_LEN)
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return SR_PACKET_NEED_RX;
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if (read_u8_inc(&buf) != DLE)
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return SR_PACKET_INVALID;
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if (read_u8_inc(&buf) != STX)
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return SR_PACKET_INVALID;
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cmd = read_u8_inc(&buf);
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/* Non-fatal, happens with OL pending during connect. */
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if (cmd == 0x01)
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cmd = 0x00;
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if (cmd != CMD_GET_READING)
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return SR_PACKET_INVALID;
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plen = read_u8_inc(&buf);
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if (plen > PKT_DATA_MAX)
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return SR_PACKET_INVALID;
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len -= PKT_HEAD_LEN;
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/* Checksum spans bfunc and value text. Length according to header. */
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if (len < plen + PKT_TAIL_LEN)
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return SR_PACKET_NEED_RX;
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crc = bm85x_crc(buf, plen);
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buf += plen;
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len -= plen;
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/* Three tail bytes: checksum, DLE, ETX. */
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if (len < PKT_TAIL_LEN)
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return SR_PACKET_NEED_RX;
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if (read_u8_inc(&buf) != crc)
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return SR_PACKET_INVALID;
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if (read_u8_inc(&buf) != DLE)
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return SR_PACKET_INVALID;
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if (read_u8_inc(&buf) != ETX)
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return SR_PACKET_INVALID;
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/*
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* Only return the total packet length when the receive buffer
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* was found to be valid. For invalid packets it's preferred to
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* have the caller keep trying to sync to the packet stream.
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*/
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if (pkt_len)
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*pkt_len = PKT_HEAD_LEN + plen + PKT_TAIL_LEN;
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return SR_PACKET_VALID;
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}
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struct bm85x_flags {
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gboolean is_batt, is_db, is_perc, is_hz, is_amp, is_beep;
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gboolean is_ohm, is_temp_f, is_temp_c, is_diode, is_cap;
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gboolean is_volt, is_dc, is_ac;
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};
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static int bm85x_parse_flags(const uint8_t *bfunc, struct bm85x_flags *flags)
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{
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if (!bfunc || !flags)
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return SR_ERR_ARG;
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memset(flags, 0, sizeof(*flags));
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flags->is_batt = bfunc[3] & (1u << 7);
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if ((bfunc[3] & 0x7f) != 0)
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return SR_ERR_ARG;
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if ((bfunc[2] & 0xff) != 0)
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return SR_ERR_ARG;
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if ((bfunc[1] & 0xc0) != 0)
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return SR_ERR_ARG;
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flags->is_db = bfunc[1] & (1u << 5);
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if ((bfunc[1] & 0x10) != 0)
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return SR_ERR_ARG;
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flags->is_perc = bfunc[1] & (1u << 3);
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flags->is_hz = bfunc[1] & (1u << 2);
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flags->is_amp = bfunc[1] & (1u << 1);
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flags->is_beep = bfunc[1] & (1u << 0);
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flags->is_ohm = bfunc[0] & (1u << 7);
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flags->is_temp_f = bfunc[0] & (1u << 6);
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flags->is_temp_c = bfunc[0] & (1u << 5);
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flags->is_diode = bfunc[0] & (1u << 4);
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flags->is_cap = bfunc[0] & (1u << 3);
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flags->is_volt = bfunc[0] & (1u << 2);
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flags->is_dc = bfunc[0] & (1u << 1);
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flags->is_ac = bfunc[0] & (1u << 0);
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return SR_OK;
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}
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static int bm85x_parse_value(char *txt, double *val, int *digits)
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{
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char *src, *dst, c;
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int ret;
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/*
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* See above comment on whitespace in response's number text.
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* The caller provides a NUL terminated writable text copy.
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* Go for low hanging fruit first (OL condition). Eliminate
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* whitespace then and do the number conversion.
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*/
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if (strstr(txt, "+OL")) {
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*val = +INFINITY;
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return SR_OK;
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}
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if (strstr(txt, "-OL")) {
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*val = -INFINITY;
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return SR_OK;
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}
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if (strstr(txt, "OL")) {
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*val = INFINITY;
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return SR_OK;
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}
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src = txt;
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dst = txt;
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while (*src) {
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c = *src++;
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if (c == ' ')
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continue;
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*dst++ = c;
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}
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*dst = '\0';
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ret = sr_atod_ascii_digits(txt, val, digits);
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if (ret != SR_OK)
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return ret;
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return SR_OK;
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}
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static int bm85x_parse_payload(const uint8_t *p, size_t l,
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double *val, struct sr_datafeed_analog *analog)
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{
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const uint8_t *bfunc;
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char text_buf[PKT_DATA_MAX], *text;
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size_t text_len;
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int ret;
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struct bm85x_flags flags;
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int digits;
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char *parse;
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/* Get a bfunc bits reference, and a writable value text. */
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bfunc = &p[0];
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text_len = l - PKT_BFUNC_LEN;
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memcpy(text_buf, &p[PKT_BFUNC_LEN], text_len);
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text_buf[text_len] = '\0';
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text = &text_buf[0];
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sr_dbg("DMM bfunc %02x %02x %02x %02x, text \"%s\"",
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bfunc[0], bfunc[1], bfunc[2], bfunc[3], text);
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/* Check 'bfunc' bitfield first, text interpretation depends on it. */
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ret = bm85x_parse_flags(bfunc, &flags);
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if (ret != SR_OK)
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return ret;
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/* Parse the text after potential normalization/transformation. */
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if (flags.is_db && flags.is_ohm) {
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static const char *prefix = " 0.";
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static const char *suffix = " E";
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/* See above comment on dBm reference value text. */
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if (strncmp(text, prefix, strlen(prefix)) != 0)
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return SR_ERR_DATA;
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text += strlen(prefix);
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text_len -= strlen(prefix);
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parse = strstr(text, suffix);
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if (!parse)
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return SR_ERR_DATA;
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*parse = '\0';
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}
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if (flags.is_temp_f || flags.is_temp_c) {
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/* See above comment on temperature value text. */
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parse = strchr(text, flags.is_temp_f ? 'F' : 'C');
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if (!parse)
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return SR_ERR_DATA;
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*parse = ' ';
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}
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digits = 0;
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ret = bm85x_parse_value(text, val, &digits);
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if (ret != SR_OK)
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return ret;
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/* Fill in MQ and flags result details. */
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analog->meaning->mqflags = 0;
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if (flags.is_volt) {
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analog->meaning->mq = SR_MQ_VOLTAGE;
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analog->meaning->unit = SR_UNIT_VOLT;
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}
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if (flags.is_amp) {
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analog->meaning->mq = SR_MQ_CURRENT;
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analog->meaning->unit = SR_UNIT_AMPERE;
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}
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if (flags.is_ohm) {
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if (flags.is_db)
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analog->meaning->mq = SR_MQ_RESISTANCE;
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else if (flags.is_beep)
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analog->meaning->mq = SR_MQ_CONTINUITY;
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else
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analog->meaning->mq = SR_MQ_RESISTANCE;
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analog->meaning->unit = SR_UNIT_OHM;
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}
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if (flags.is_hz) {
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analog->meaning->mq = SR_MQ_FREQUENCY;
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analog->meaning->unit = SR_UNIT_HERTZ;
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}
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if (flags.is_perc) {
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analog->meaning->mq = SR_MQ_DUTY_CYCLE;
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analog->meaning->unit = SR_UNIT_PERCENTAGE;
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}
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if (flags.is_cap) {
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analog->meaning->mq = SR_MQ_CAPACITANCE;
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analog->meaning->unit = SR_UNIT_FARAD;
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}
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if (flags.is_temp_f) {
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analog->meaning->mq = SR_MQ_TEMPERATURE;
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analog->meaning->unit = SR_UNIT_FAHRENHEIT;
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}
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if (flags.is_temp_c) {
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analog->meaning->mq = SR_MQ_TEMPERATURE;
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analog->meaning->unit = SR_UNIT_CELSIUS;
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}
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if (flags.is_db && !flags.is_ohm) {
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/* See above comment on dBm measurements scale. */
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analog->meaning->mq = SR_MQ_POWER;
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analog->meaning->unit = SR_UNIT_DECIBEL_MW;
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*val *= 1000;
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digits -= 3;
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}
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|
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if (flags.is_diode) {
|
||||
/* See above comment on diode measurement responses. */
|
||||
analog->meaning->mq = SR_MQ_VOLTAGE;
|
||||
analog->meaning->unit = SR_UNIT_VOLT;
|
||||
analog->meaning->mqflags |= SR_MQFLAG_DIODE;
|
||||
analog->meaning->mqflags |= SR_MQFLAG_DC;
|
||||
}
|
||||
if (flags.is_ac)
|
||||
analog->meaning->mqflags |= SR_MQFLAG_AC;
|
||||
if (flags.is_dc)
|
||||
analog->meaning->mqflags |= SR_MQFLAG_DC;
|
||||
|
||||
analog->encoding->digits = digits;
|
||||
analog->spec->spec_digits = digits;
|
||||
|
||||
if (flags.is_batt)
|
||||
sr_warn("Low battery!");
|
||||
|
||||
return SR_OK;
|
||||
}
|
||||
|
||||
SR_PRIV int brymen_bm85x_parse(void *st, const uint8_t *buf, size_t len,
|
||||
double *val, struct sr_datafeed_analog *analog, void *info)
|
||||
{
|
||||
const uint8_t *pl_ptr;
|
||||
size_t pl_len;
|
||||
|
||||
(void)st;
|
||||
(void)info;
|
||||
|
||||
if (!buf || !len)
|
||||
return SR_ERR_DATA;
|
||||
if (!val || !analog)
|
||||
return SR_ERR_DATA;
|
||||
|
||||
if (brymen_bm85x_packet_valid(NULL, buf, len, NULL) != SR_PACKET_VALID)
|
||||
return SR_ERR_DATA;
|
||||
pl_ptr = &buf[PKT_HEAD_LEN];
|
||||
pl_len = len - PKT_HEAD_LEN - PKT_TAIL_LEN;
|
||||
|
||||
return bm85x_parse_payload(pl_ptr, pl_len, val, analog);
|
||||
}
|
||||
|
|
@ -372,6 +372,17 @@ SR_REGISTER_DEV_DRIVER_LIST(serial_dmm_drivers,
|
|||
NULL
|
||||
),
|
||||
/* }}} */
|
||||
/* bm85x based meters {{{ */
|
||||
DMM_LEN(
|
||||
"brymen-bm85x", brymen_bm85x, "Brymen", "BM85x",
|
||||
NULL, "9600/8n1/dtr=1/rts=1",
|
||||
BRYMEN_BM85x_PACKET_SIZE_MIN, 2000, 400,
|
||||
NULL, NULL, /* INIT/FREE for DMM state */
|
||||
brymen_bm85x_after_open, brymen_bm85x_packet_request,
|
||||
brymen_bm85x_packet_valid, brymen_bm85x_parse,
|
||||
NULL
|
||||
),
|
||||
/* }}} */
|
||||
/* bm86x based meters {{{ */
|
||||
DMM_CONN(
|
||||
"brymen-bm86x", brymen_bm86x, "Brymen", "BM86x",
|
||||
|
|
|
|||
|
|
@ -2349,6 +2349,21 @@ SR_PRIV gboolean sr_brymen_bm52x_packet_valid(const uint8_t *buf);
|
|||
SR_PRIV int sr_brymen_bm52x_parse(const uint8_t *buf, float *floatval,
|
||||
struct sr_datafeed_analog *analog, void *info);
|
||||
|
||||
/*--- dmm/bm85x.c -----------------------------------------------------------*/
|
||||
|
||||
#define BRYMEN_BM85x_PACKET_SIZE_MIN 4
|
||||
|
||||
struct brymen_bm85x_info { int dummy; };
|
||||
|
||||
#ifdef HAVE_SERIAL_COMM
|
||||
SR_PRIV int brymen_bm85x_after_open(struct sr_serial_dev_inst *serial);
|
||||
SR_PRIV int brymen_bm85x_packet_request(struct sr_serial_dev_inst *serial);
|
||||
#endif
|
||||
SR_PRIV gboolean brymen_bm85x_packet_valid(void *state,
|
||||
const uint8_t *buf, size_t len, size_t *pkt_len);
|
||||
SR_PRIV int brymen_bm85x_parse(void *state, const uint8_t *buf, size_t len,
|
||||
double *floatval, struct sr_datafeed_analog *analog, void *info);
|
||||
|
||||
/*--- dmm/bm86x.c -----------------------------------------------------------*/
|
||||
|
||||
#define BRYMEN_BM86X_PACKET_SIZE 24
|
||||
|
|
|
|||
Loading…
Reference in New Issue