427 lines
10 KiB
C
427 lines
10 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
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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 "protocol.h"
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SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
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{ NMADMM_REQ_IDN, "IDN?" },
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{ NMADMM_REQ_IDN, "STATUS?" },
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{ 0, NULL },
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};
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static int nma_send_req(const struct sr_dev_inst *sdi, int req, char *params)
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{
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struct sr_serial_dev_inst *serial;
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struct dev_context *devc;
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char buf[NMADMM_BUFSIZE];
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int len;
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if (!sdi || !(serial = sdi->conn) || !(devc = sdi->priv))
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return SR_ERR_BUG;
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len = snprintf(buf, sizeof(buf), "%s%s\r\n",
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nmadmm_requests[req].req_str, params ? params : "");
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sr_spew("Sending request: '%s'.", buf);
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devc->last_req = req;
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devc->last_req_pending = TRUE;
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if (serial_write(serial, buf, len) == -1) {
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sr_err("Unable to send request: %d %s.",
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errno, strerror(errno));
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devc->last_req_pending = FALSE;
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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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/**
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* Convert hexadecimal digit to int.
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*
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* @param[in] xgit Hexadecimal digit to convert.
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* @return Int value of xgit (0 on invalid xgit).
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*/
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SR_PRIV int xgittoint(char xgit)
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{
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if ((xgit >= '0') && (xgit <= '9'))
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return xgit - '0';
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xgit = tolower(xgit);
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if ((xgit >= 'a') && (xgit <= 'f'))
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return xgit - 'a';
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return 0;
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}
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/**
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* Process received line. It consists of 20 hex digits + \\r\\n,
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* e.g. '08100400018100400000'.
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*/
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static void nma_process_line(const struct sr_dev_inst *sdi)
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{
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struct dev_context *devc;
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int pos, flags;
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int vt, range; /* Measurement value type, range in device format */
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int mmode, devstat; /* Measuring mode, device status */
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float value; /* Measured value */
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float scale; /* Scaling factor depending on range and function */
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struct sr_datafeed_analog analog;
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struct sr_datafeed_packet packet;
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devc = sdi->priv;
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devc->buf[20] = '\0';
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sr_spew("Received line '%s'.", devc->buf);
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/* Check line. */
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if (strlen((const char *)devc->buf) != 20) {
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sr_err("line: Invalid status '%s', must be 20 hex digits.",
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devc->buf);
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devc->buflen = 0;
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return;
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}
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for (pos = 0; pos < 20; pos++) {
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if (!isxdigit(devc->buf[pos])) {
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sr_err("line: Expected hex digit in '%s' at pos %d!",
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devc->buf, pos);
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devc->buflen = 0;
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return;
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}
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}
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/* Start decoding. */
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value = 0.0;
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scale = 1.0;
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memset(&analog, 0, sizeof(analog));
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/*
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* The numbers are hex digits, starting from 0.
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* 0: Keyboard status, currently not interesting.
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* 1: Central switch status, currently not interesting.
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* 2: Type of measured value.
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*/
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vt = xgittoint(devc->buf[2]);
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switch (vt) {
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case 0:
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analog.mq = SR_MQ_VOLTAGE;
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break;
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case 1:
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analog.mq = SR_MQ_CURRENT; /* 2A */
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break;
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case 2:
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analog.mq = SR_MQ_RESISTANCE;
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break;
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case 3:
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analog.mq = SR_MQ_CAPACITANCE;
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break;
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case 4:
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analog.mq = SR_MQ_TEMPERATURE;
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break;
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case 5:
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analog.mq = SR_MQ_FREQUENCY;
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break;
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case 6:
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analog.mq = SR_MQ_CURRENT; /* 10A */
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break;
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case 7:
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analog.mq = SR_MQ_GAIN; /* TODO: Scale factor */
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break;
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case 8:
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analog.mq = SR_MQ_GAIN; /* Percentage */
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scale /= 100.0;
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break;
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case 9:
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analog.mq = SR_MQ_GAIN; /* dB */
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scale /= 100.0;
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break;
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default:
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sr_err("Unknown value type: 0x%02x.", vt);
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break;
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}
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/* 3: Measurement range for measured value */
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range = xgittoint(devc->buf[3]);
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switch (vt) {
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case 0: /* V */
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scale *= pow(10.0, range - 5);
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break;
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case 1: /* A */
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scale *= pow(10.0, range - 7);
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break;
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case 2: /* Ω */
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scale *= pow(10.0, range - 2);
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break;
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case 3: /* F */
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scale *= pow(10.0, range - 12);
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break;
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case 4: /* °C */
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scale *= pow(10.0, range - 1);
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break;
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case 5: /* Hz */
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scale *= pow(10.0, range - 2);
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break;
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// No default, other value types have fixed display format.
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}
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/* 5: Sign and 1st digit */
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flags = xgittoint(devc->buf[5]);
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value = (flags & 0x03);
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if (flags & 0x04)
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scale *= -1;
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/* 6-9: 2nd-4th digit */
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for (pos = 6; pos < 10; pos++)
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value = value * 10 + xgittoint(devc->buf[pos]);
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value *= scale;
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/* 10: Display counter */
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mmode = xgittoint(devc->buf[10]);
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switch (mmode) {
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case 0: /* Frequency */
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analog.unit = SR_UNIT_HERTZ;
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break;
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case 1: /* V TRMS, only type 5 */
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analog.unit = SR_UNIT_VOLT;
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analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
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break;
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case 2: /* V AC */
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analog.unit = SR_UNIT_VOLT;
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analog.mqflags |= SR_MQFLAG_AC;
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if (devc->type >= 3)
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analog.mqflags |= SR_MQFLAG_RMS;
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break;
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case 3: /* V DC */
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analog.unit = SR_UNIT_VOLT;
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analog.mqflags |= SR_MQFLAG_DC;
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break;
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case 4: /* Ohm */
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analog.unit = SR_UNIT_OHM;
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break;
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case 5: /* Continuity */
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analog.unit = SR_UNIT_BOOLEAN;
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analog.mq = SR_MQ_CONTINUITY;
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/* TODO: Continuity handling is a bit odd in libsigrok. */
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break;
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case 6: /* Degree Celsius */
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analog.unit = SR_UNIT_CELSIUS;
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break;
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case 7: /* Capacity */
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analog.unit = SR_UNIT_FARAD;
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break;
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case 8: /* Current DC */
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analog.unit = SR_UNIT_AMPERE;
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analog.mqflags |= SR_MQFLAG_DC;
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break;
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case 9: /* Current AC */
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analog.unit = SR_UNIT_AMPERE;
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analog.mqflags |= SR_MQFLAG_AC;
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if (devc->type >= 3)
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analog.mqflags |= SR_MQFLAG_RMS;
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break;
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case 0xa: /* Current TRMS, only type 5 */
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analog.unit = SR_UNIT_AMPERE;
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analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
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break;
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case 0xb: /* Diode */
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analog.unit = SR_UNIT_VOLT;
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analog.mqflags |= (SR_MQFLAG_DIODE | SR_MQFLAG_DC);
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break;
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default:
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sr_err("Unknown mmode: 0x%02x.", mmode);
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break;
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}
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/* 11: Device status */
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devstat = xgittoint(devc->buf[11]);
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switch (devstat) {
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case 1: /* Normal measurement */
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break;
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case 2: /* Input loop (limit, reference values) */
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break;
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case 3: /* TRANS/SENS */
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break;
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case 4: /* Error */
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sr_err("Device error. Fuse?"); /* TODO: Really abort? */
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devc->buflen = 0;
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return; /* Cannot continue. */
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default:
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sr_err("Unknown device status: 0x%02x", devstat);
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break;
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}
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/* 12-19: Flags and display symbols */
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/* 12, 13 */
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flags = (xgittoint(devc->buf[12]) << 8) | xgittoint(devc->buf[13]);
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/* 0x80: PRINT TODO: Stop polling when discovered? */
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/* 0x40: EXTR */
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if (analog.mq == SR_MQ_CONTINUITY) {
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if (flags & 0x20)
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value = 1.0; /* Beep */
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else
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value = 0.0;
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}
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/* 0x10: AVG */
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/* 0x08: Diode */
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if (flags & 0x04) /* REL */
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analog.mqflags |= SR_MQFLAG_RELATIVE;
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/* 0x02: SHIFT */
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if (flags & 0x01) /* % */
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analog.unit = SR_UNIT_PERCENTAGE;
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/* 14, 15 */
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flags = (xgittoint(devc->buf[14]) << 8) | xgittoint(devc->buf[15]);
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if (!(flags & 0x80)) /* MAN: Manual range */
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analog.mqflags |= SR_MQFLAG_AUTORANGE;
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if (flags & 0x40) /* LOBATT1: Low battery, measurement still within specs */
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devc->lowbatt = 1;
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/* 0x20: PEAK */
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/* 0x10: COUNT */
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if (flags & 0x08) /* HOLD */
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analog.mqflags |= SR_MQFLAG_HOLD;
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/* 0x04: LIMIT */
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if (flags & 0x02) /* MAX */
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analog.mqflags |= SR_MQFLAG_MAX;
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if (flags & 0x01) /* MIN */
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analog.mqflags |= SR_MQFLAG_MIN;
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/* 16, 17 */
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flags = (xgittoint(devc->buf[16]) << 8) | xgittoint(devc->buf[17]);
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/* 0xe0: undefined */
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if (flags & 0x10) { /* LOBATT2: Low battery, measurement inaccurate */
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devc->lowbatt = 2;
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sr_warn("Low battery, measurement quality degraded!");
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}
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/* 0x08: SCALED */
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/* 0x04: RATE (=lower resolution, allows higher rata rate up to 10/s. */
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/* 0x02: Current clamp */
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if (flags & 0x01) { /* dB */
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/*
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* TODO: The Norma has an adjustable dB reference value. If
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* changed from default, this is not correct.
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*/
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if (analog.unit == SR_UNIT_VOLT)
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analog.unit = SR_UNIT_DECIBEL_VOLT;
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else
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analog.unit = SR_UNIT_UNITLESS;
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}
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/* 18, 19 */
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/* flags = (xgittoint(devc->buf[18]) << 8) | xgittoint(devc->buf[19]); */
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/* 0x80: Undefined. */
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/* 0x40: Remote mode, keyboard locked */
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/* 0x38: Undefined. */
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/* 0x04: MIN > MAX */
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/* 0x02: Measured value < Min */
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/* 0x01: Measured value > Max */
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/* 4: Flags. Evaluating this after setting value! */
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flags = xgittoint(devc->buf[4]);
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if (flags & 0x04) /* Invalid value */
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value = NAN;
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else if (flags & 0x01) /* Overload */
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value = INFINITY;
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if (flags & 0x02) { /* Duplicate value, has been sent before. */
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sr_spew("Duplicate value, dismissing!");
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devc->buflen = 0;
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return;
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}
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sr_spew("range=%d/scale=%f/value=%f", range,
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(double)scale, (double)value);
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/* Finish and send packet. */
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analog.probes = sdi->probes;
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analog.num_samples = 1;
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analog.data = &value;
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memset(&packet, 0, sizeof(packet));
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog;
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sr_session_send(devc->cb_data, &packet);
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/* Finish processing. */
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devc->num_samples++;
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devc->buflen = 0;
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}
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SR_PRIV int norma_dmm_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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struct sr_serial_dev_inst *serial;
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int len;
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gboolean terminating;
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gdouble elapsed_s;
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(void)fd;
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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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serial = sdi->conn;
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if (revents == G_IO_IN) {
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/* Serial data arrived. */
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while (NMADMM_BUFSIZE - devc->buflen - 1 > 0) {
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len = serial_read(serial, devc->buf + devc->buflen, 1);
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if (len < 1)
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break;
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devc->buflen += len;
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*(devc->buf + devc->buflen) = '\0';
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if (*(devc->buf + devc->buflen - 1) == '\n') {
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/*
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* TODO: According to specs, should be \r, but
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* then we'd have to get rid of the \n.
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*/
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devc->last_req_pending = FALSE;
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nma_process_line(sdi);
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break;
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}
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}
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}
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/* If number of samples or time limit reached, stop acquisition. */
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terminating = FALSE;
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if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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terminating = TRUE;
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}
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if (devc->limit_msec) {
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elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
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if ((elapsed_s * 1000) >= devc->limit_msec) {
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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terminating = TRUE;
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}
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}
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/* Request next package. */
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if (!terminating && !devc->last_req_pending) {
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if (nma_send_req(sdi, NMADMM_REQ_STATUS, NULL) != SR_OK)
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return FALSE;
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}
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return TRUE;
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}
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