344 lines
9.2 KiB
C
344 lines
9.2 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
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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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#include <string.h>
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#include <math.h>
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#include "protocol.h"
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#define USB_TIMEOUT 500
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static char char_map[128] = {
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[0x20] = '-',
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[0x5F] = '0',
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[0x50] = '1',
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[0x6D] = '2',
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[0x7C] = '3',
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[0x72] = '4',
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[0x3E] = '5',
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[0x3F] = '6',
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[0x54] = '7',
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[0x7F] = '8',
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[0x7E] = '9',
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[0x0F] = 'C',
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[0x27] = 'F',
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[0x0B] = 'L',
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[0x79] = 'd',
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[0x10] = 'i',
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[0x39] = 'o',
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};
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static int brymen_bm86x_parse_digits(const unsigned char *buf, int length,
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char *str, float *floatval,
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char *temp_unit, int flag)
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{
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char c, *p = str;
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int i, ret;
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if (buf[0] & flag)
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*p++ = '-';
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for (i = 0; i < length; i++) {
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if (i && i < 5 && buf[i+1] & 0x01)
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*p++ = '.';
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c = char_map[buf[i+1] >> 1];
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if (i == 5 && (c == 'C' || c == 'F'))
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*temp_unit = c;
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else if (c)
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*p++ = c;
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}
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*p = 0;
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if ((ret = sr_atof_ascii(str, floatval))) {
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sr_dbg("invalid float string: '%s'", str);
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return ret;
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}
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return SR_OK;
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}
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static void brymen_bm86x_parse(unsigned char *buf, float *floatval,
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struct sr_datafeed_analog *analog)
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{
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char str[16], temp_unit;
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int ret1, ret2, over_limit;
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ret1 = brymen_bm86x_parse_digits(buf+2, 6, str, &floatval[0],
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&temp_unit, 0x80);
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over_limit = strstr(str, "0L") || strstr(str, "0.L");
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ret2 = brymen_bm86x_parse_digits(buf+9, 4, str, &floatval[1],
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&temp_unit, 0x10);
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/* main display */
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if (ret1 == SR_OK || over_limit) {
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/* SI unit */
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if (buf[8] & 0x01) {
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analog[0].mq = SR_MQ_VOLTAGE;
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analog[0].unit = SR_UNIT_VOLT;
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if (!strcmp(str, "diod"))
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analog[0].mqflags |= SR_MQFLAG_DIODE;
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} else if (buf[14] & 0x80) {
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analog[0].mq = SR_MQ_CURRENT;
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analog[0].unit = SR_UNIT_AMPERE;
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} else if (buf[14] & 0x20) {
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analog[0].mq = SR_MQ_CAPACITANCE;
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analog[0].unit = SR_UNIT_FARAD;
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} else if (buf[14] & 0x10) {
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analog[0].mq = SR_MQ_CONDUCTANCE;
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analog[0].unit = SR_UNIT_SIEMENS;
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} else if (buf[15] & 0x01) {
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analog[0].mq = SR_MQ_FREQUENCY;
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analog[0].unit = SR_UNIT_HERTZ;
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} else if (buf[10] & 0x01) {
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analog[0].mq = SR_MQ_CONTINUITY;
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analog[0].unit = SR_UNIT_OHM;
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} else if (buf[15] & 0x10) {
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analog[0].mq = SR_MQ_RESISTANCE;
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analog[0].unit = SR_UNIT_OHM;
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} else if (buf[15] & 0x02) {
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analog[0].mq = SR_MQ_POWER;
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analog[0].unit = SR_UNIT_DECIBEL_MW;
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} else if (buf[15] & 0x80) {
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analog[0].mq = SR_MQ_DUTY_CYCLE;
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analog[0].unit = SR_UNIT_PERCENTAGE;
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} else if (buf[ 2] & 0x0A) {
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analog[0].mq = SR_MQ_TEMPERATURE;
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if (temp_unit == 'F')
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analog[0].unit = SR_UNIT_FAHRENHEIT;
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else
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analog[0].unit = SR_UNIT_CELSIUS;
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}
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/* when MIN MAX and AVG are displayed at the same time, remove them */
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if ((buf[1] & 0xE0) == 0xE0)
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buf[1] &= ~0xE0;
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/* AC/DC/Auto flags */
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if (buf[1] & 0x10) analog[0].mqflags |= SR_MQFLAG_DC;
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if (buf[2] & 0x01) analog[0].mqflags |= SR_MQFLAG_AC;
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if (buf[1] & 0x01) analog[0].mqflags |= SR_MQFLAG_AUTORANGE;
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if (buf[1] & 0x08) analog[0].mqflags |= SR_MQFLAG_HOLD;
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if (buf[1] & 0x20) analog[0].mqflags |= SR_MQFLAG_MAX;
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if (buf[1] & 0x40) analog[0].mqflags |= SR_MQFLAG_MIN;
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if (buf[1] & 0x80) analog[0].mqflags |= SR_MQFLAG_AVG;
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if (buf[3] & 0x01) analog[0].mqflags |= SR_MQFLAG_RELATIVE;
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/* when dBm is displayed, remove the m suffix so that it is
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not considered as the 10e-3 SI prefix */
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if (buf[15] & 0x02)
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buf[15] &= ~0x04;
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/* SI prefix */
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if (buf[14] & 0x40) floatval[0] *= 1e-9; /* n */
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if (buf[15] & 0x08) floatval[0] *= 1e-6; /* µ */
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if (buf[15] & 0x04) floatval[0] *= 1e-3; /* m */
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if (buf[15] & 0x40) floatval[0] *= 1e3; /* k */
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if (buf[15] & 0x20) floatval[0] *= 1e6; /* M */
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if (over_limit) floatval[0] = INFINITY;
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}
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/* secondary display */
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if (ret2 == SR_OK) {
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/* SI unit */
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if (buf[14] & 0x08) {
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analog[1].mq = SR_MQ_VOLTAGE;
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analog[1].unit = SR_UNIT_VOLT;
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} else if (buf[9] & 0x04) {
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analog[1].mq = SR_MQ_CURRENT;
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analog[1].unit = SR_UNIT_AMPERE;
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} else if (buf[14] & 0x04) {
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analog[1].mq = SR_MQ_FREQUENCY;
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analog[1].unit = SR_UNIT_HERTZ;
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} else if (buf[9] & 0x40) {
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analog[1].mq = SR_MQ_TEMPERATURE;
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if (temp_unit == 'F')
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analog[1].unit = SR_UNIT_FAHRENHEIT;
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else
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analog[1].unit = SR_UNIT_CELSIUS;
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}
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/* AC flag */
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if (buf[9] & 0x20) analog[1].mqflags |= SR_MQFLAG_AC;
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/* SI prefix */
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if (buf[ 9] & 0x01) floatval[1] *= 1e-6; /* µ */
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if (buf[ 9] & 0x02) floatval[1] *= 1e-3; /* m */
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if (buf[14] & 0x02) floatval[1] *= 1e3; /* k */
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if (buf[14] & 0x01) floatval[1] *= 1e6; /* M */
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}
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if (buf[9] & 0x80)
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sr_spew("Battery is low.");
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}
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static void brymen_bm86x_handle_packet(const struct sr_dev_inst *sdi,
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unsigned char *buf)
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{
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struct dev_context *devc;
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog analog[2];
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float floatval[2];
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devc = sdi->priv;
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analog[0].mq = -1;
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analog[0].mqflags = 0;
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analog[1].mq = -1;
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analog[1].mqflags = 0;
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brymen_bm86x_parse(buf, floatval, analog);
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if (analog[0].mq != -1) {
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/* Got a measurement. */
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analog[0].num_samples = 1;
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analog[0].data = &floatval[0];
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analog[0].channels = g_slist_append(NULL, sdi->channels->data);
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog[0];
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sr_session_send(devc->session_cb_data, &packet);
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g_slist_free(analog[0].channels);
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}
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if (analog[1].mq != -1) {
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/* Got a measurement. */
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analog[1].num_samples = 1;
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analog[1].data = &floatval[1];
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analog[1].channels = g_slist_append(NULL, sdi->channels->next->data);
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog[1];
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sr_session_send(devc->session_cb_data, &packet);
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g_slist_free(analog[1].channels);
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}
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if (analog[0].mq != -1 || analog[1].mq != -1)
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devc->num_samples++;
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}
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static int brymen_bm86x_send_command(const struct sr_dev_inst *sdi)
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{
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struct sr_usb_dev_inst *usb;
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unsigned char buf[] = { 0x00, 0x86, 0x66 };
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int ret;
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usb = sdi->conn;
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sr_dbg("Sending HID set report.");
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ret = libusb_control_transfer(usb->devhdl,
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LIBUSB_REQUEST_TYPE_CLASS |
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LIBUSB_RECIPIENT_INTERFACE |
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LIBUSB_ENDPOINT_OUT,
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9, /* bRequest: HID set_report */
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0x300, /* wValue: HID feature, report num 0 */
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0, /* wIndex: interface 0 */
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buf, sizeof(buf), USB_TIMEOUT);
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if (ret < 0) {
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sr_err("HID feature report error: %s.", libusb_error_name(ret));
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return SR_ERR;
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}
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if (ret != sizeof(buf)) {
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sr_err("Short packet: sent %d/%ld bytes.", ret, sizeof(buf));
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return SR_ERR;
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}
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return SR_OK;
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}
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static int brymen_bm86x_read_interrupt(const struct sr_dev_inst *sdi)
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{
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struct dev_context *devc;
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struct sr_usb_dev_inst *usb;
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unsigned char buf[24];
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int ret, transferred;
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devc = sdi->priv;
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usb = sdi->conn;
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sr_dbg("Reading HID interrupt report.");
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/* Get data from EP1 using an interrupt transfer. */
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ret = libusb_interrupt_transfer(usb->devhdl,
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LIBUSB_ENDPOINT_IN | 1, /* EP1, IN */
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buf, sizeof(buf),
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&transferred, USB_TIMEOUT);
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if (ret == LIBUSB_ERROR_TIMEOUT) {
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if (++devc->interrupt_pending > 3)
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devc->interrupt_pending = 0;
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return SR_OK;
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}
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if (ret < 0) {
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sr_err("USB receive error: %s.", libusb_error_name(ret));
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return SR_ERR;
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}
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if (transferred != sizeof(buf)) {
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sr_err("Short packet: received %d/%d bytes.", transferred, sizeof(buf));
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return SR_ERR;
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}
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devc->interrupt_pending = 0;
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brymen_bm86x_handle_packet(sdi, buf);
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return SR_OK;
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}
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SR_PRIV int brymen_bm86x_receive_data(int fd, int revents, void *cb_data)
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{
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struct sr_dev_inst *sdi;
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struct dev_context *devc;
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int64_t time;
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(void)fd;
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(void)revents;
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if (!(sdi = cb_data))
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return TRUE;
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if (!(devc = sdi->priv))
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return TRUE;
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if (!devc->interrupt_pending) {
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if (brymen_bm86x_send_command(sdi))
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return FALSE;
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devc->interrupt_pending = 1;
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}
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if (brymen_bm86x_read_interrupt(sdi))
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return FALSE;
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if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
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sr_info("Requested number of samples reached, stopping.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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return TRUE;
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}
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if (devc->limit_msec) {
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time = (g_get_monotonic_time() - devc->start_time) / 1000;
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if (time > (int64_t)devc->limit_msec) {
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sr_info("Requested time limit reached, stopping.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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return TRUE;
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}
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}
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return TRUE;
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}
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