416 lines
11 KiB
C
416 lines
11 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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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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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include "radioshack-dmm.h"
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <errno.h>
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static gboolean rs_22_812_is_checksum_valid(const rs_22_812_packet *data)
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{
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uint8_t *raw = (void *) data;
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uint8_t sum = 0;
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size_t i;
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for(i = 0; i < RS_22_812_PACKET_SIZE - 1; i++)
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sum += raw[i];
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/* This is just a funky constant added to the checksum */
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sum += 57;
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sum -= data->checksum;
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return(sum == 0);
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}
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static gboolean rs_22_812_is_mode_valid(rs_22_812_mode mode)
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{
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return(mode < RS_22_812_MODE_INVALID);
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}
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static gboolean rs_22_812_is_selection_good(const rs_22_812_packet *data)
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{
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int n_postfix = 0;
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int n_type = 0;
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/* Does the packet have more than one multiplier ? */
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if(data->indicatrix1 & RS_22_812_IND1_KILO)
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n_postfix++;
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if(data->indicatrix1 & RS_22_812_IND1_MEGA)
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n_postfix++;
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if(data->indicatrix1 & RS_22_812_IND1_MILI)
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n_postfix++;
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if(data->indicatrix2 & RS_22_812_IND2_MICRO)
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n_postfix++;
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if(data->indicatrix2 & RS_22_812_IND2_NANO)
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n_postfix++;
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if(n_postfix > 1)
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return FALSE;
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/* Does the packet "measure" more than one type of value ?*/
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if(data->indicatrix1 & RS_22_812_IND1_HZ)
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n_type++;
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if(data->indicatrix1 & RS_22_812_IND1_OHM)
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n_type++;
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if(data->indicatrix1 & RS_22_812_IND1_FARAD)
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n_type++;
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if(data->indicatrix1 & RS_22_812_IND1_AMP)
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n_type++;
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if(data->indicatrix1 & RS_22_812_IND1_VOLT)
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n_type++;
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if(data->indicatrix2 & RS_22_812_IND2_DBM)
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n_type++;
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if(data->indicatrix2 & RS_22_812_IND2_SEC)
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n_type++;
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if(data->indicatrix2 & RS_22_812_IND2_DUTY)
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n_type++;
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if(data->indicatrix2 & RS_22_812_IND2_HFE)
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n_type++;
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if(n_type > 1)
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return FALSE;
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/* OK, no duplicates */
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return TRUE;
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}
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/* Since the RS 22-812 does not identify itslef in any way shape, or form,
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* we really don't know for sure who is sending the data. We must use every
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* possible check to filter out bad packets, especially since detection of the
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* 22-812 depends on how well we can filter the packets */
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SR_PRIV gboolean rs_22_812_is_packet_valid(const rs_22_812_packet *packet)
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{
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/* Unfortunately, the packet doesn't have a signature, so we must
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* compute its checksum first */
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if(!rs_22_812_is_checksum_valid(packet))
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return FALSE;
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if(!rs_22_812_is_mode_valid(packet->mode))
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return FALSE;
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if(!rs_22_812_is_selection_good(packet)) {
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return FALSE;
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}
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/* Made it here, huh? Then this looks to be a valid packet */
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return TRUE;
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}
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static uint8_t rs_22_812_to_digit(uint8_t raw_digit)
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{
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/* Take out the decimal point, so we can use a simple switch() */
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raw_digit &= ~RS_22_812_DP_MASK;
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switch(raw_digit)
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{
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case 0x00:
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case RS_22_812_LCD_0:
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return 0;
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case RS_22_812_LCD_1:
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return 1;
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case RS_22_812_LCD_2:
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return 2;
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case RS_22_812_LCD_3:
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return 3;
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case RS_22_812_LCD_4:
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return 4;
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case RS_22_812_LCD_5:
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return 5;
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case RS_22_812_LCD_6:
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return 6;
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case RS_22_812_LCD_7:
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return 7;
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case RS_22_812_LCD_8:
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return 8;
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case RS_22_812_LCD_9:
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return 9;
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default:
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return 0xff;
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}
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}
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typedef enum {
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READ_ALL,
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READ_TEMP,
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} value_type;
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static double lcdraw_to_double(rs_22_812_packet *rs_packet, value_type type)
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{
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/* *********************************************************************
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* Get a raw floating point value from the data
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**********************************************************************/
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double rawval;
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double multiplier = 1;
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uint8_t digit;
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gboolean dp_reached = FALSE;
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int i, end;
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switch(type) {
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case READ_TEMP:
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/* Do not parse the last digit */
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end = 1;
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break;
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case READ_ALL:
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default:
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/* Parse all digits */
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end = 0;
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}
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/* We have 4 digits, and we start from the most significant */
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for(i = 3; i >= end; i--)
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{
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uint8_t raw_digit = *(&(rs_packet->digit4) + i);
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digit = rs_22_812_to_digit(raw_digit);
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if(digit == 0xff) {
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rawval = NAN;
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break;
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}
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/* Digit 1 does not have a decimal point. Instead, the decimal
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* point is used to indicate MAX, so we must avoid testing it */
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if( (i < 3) && (raw_digit & RS_22_812_DP_MASK) )
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dp_reached = TRUE;
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if(dp_reached) multiplier /= 10;
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rawval = rawval * 10 + digit;
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}
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rawval *= multiplier;
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if(rs_packet->info & RS_22_812_INFO_NEG)
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rawval *= -1;
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/* See if we need to multiply our raw value by anything */
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if(rs_packet->indicatrix1 & RS_22_812_IND2_NANO) {
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rawval *= 1E-9;
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} else if(rs_packet->indicatrix2 & RS_22_812_IND2_MICRO) {
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rawval *= 1E-6;
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} else if(rs_packet->indicatrix1 & RS_22_812_IND1_MILI) {
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rawval *= 1E-3;
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} else if(rs_packet->indicatrix1 & RS_22_812_IND1_KILO) {
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rawval *= 1E3;
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} else if(rs_packet->indicatrix1 & RS_22_812_IND1_MEGA) {
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rawval *= 1E6;
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}
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return rawval;
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}
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static gboolean rs_22_812_is_celsius(rs_22_812_packet *rs_packet)
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{
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return((rs_packet->digit4 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_C);
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}
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static gboolean rs_22_812_is_shortcirc(rs_22_812_packet *rs_packet)
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{
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return((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_h);
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}
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static gboolean rs_22_812_is_logic_high(rs_22_812_packet *rs_packet)
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{
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sr_spew("digit 2: %x", rs_packet->digit2 & ~RS_22_812_DP_MASK);
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return((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_H);
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}
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static void rs_22_812_handle_packet(rs_22_812_packet *rs_packet,
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rs_dev_ctx *devc)
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{
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double rawval = lcdraw_to_double(rs_packet, READ_ALL);
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/* *********************************************************************
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* Now see what the value means, and pass that on
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**********************************************************************/
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog *analog;
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analog = g_try_malloc0(sizeof(struct sr_datafeed_analog));
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analog->num_samples = 1;
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analog->data = g_try_malloc(sizeof(float));
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*analog->data = (float)rawval;
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analog->mq = -1;
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switch(rs_packet->mode) {
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case RS_22_812_MODE_DC_V:
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analog->mq = SR_MQ_VOLTAGE;
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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 RS_22_812_MODE_AC_V:
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analog->mq = SR_MQ_VOLTAGE;
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analog->unit = SR_UNIT_VOLT;
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analog->mqflags |= SR_MQFLAG_AC;
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break;
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case RS_22_812_MODE_DC_UA:
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case RS_22_812_MODE_DC_MA:
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case RS_22_812_MODE_DC_A:
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analog->mq = SR_MQ_CURRENT;
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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 RS_22_812_MODE_AC_UA:
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case RS_22_812_MODE_AC_MA:
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case RS_22_812_MODE_AC_A:
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analog->mq = SR_MQ_CURRENT;
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analog->unit = SR_UNIT_AMPERE;
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analog->mqflags |= SR_MQFLAG_AC;
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break;
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case RS_22_812_MODE_OHM:
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analog->mq = SR_MQ_RESISTANCE;
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analog->unit = SR_UNIT_OHM;
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break;
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case RS_22_812_MODE_FARAD:
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analog->mq = SR_MQ_CAPACITANCE;
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analog->unit = SR_UNIT_FARAD;
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break;
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case RS_22_812_MODE_CONT:
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analog->mq = SR_MQ_CONTINUITY;
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analog->unit = SR_UNIT_BOOLEAN;
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*analog->data = rs_22_812_is_shortcirc(rs_packet);
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break;
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case RS_22_812_MODE_DIODE:
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analog->mq = SR_MQ_VOLTAGE;
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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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case RS_22_812_MODE_HZ:
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case RS_22_812_MODE_VOLT_HZ:
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case RS_22_812_MODE_AMP_HZ:
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analog->mq = SR_MQ_FREQUENCY;
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analog->unit = SR_UNIT_HERTZ;
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break;
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case RS_22_812_MODE_LOGIC:
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/* No matter whether or not we have an actual voltage reading,
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* we are measuring voltage, so we set our MQ as VOLTAGE */
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analog->mq = SR_MQ_VOLTAGE;
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if(!isnan(rawval)) {
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/* We have an actual voltage */
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analog->unit = SR_UNIT_VOLT;
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} else {
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/* We have either HI or LOW */
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analog->unit = SR_UNIT_BOOLEAN;
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*analog->data = rs_22_812_is_logic_high(rs_packet);
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}
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break;
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case RS_22_812_MODE_HFE:
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analog->mq = SR_MQ_GAIN;
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analog->unit = SR_UNIT_UNITLESS;
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break;
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case RS_22_812_MODE_DUTY:
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case RS_22_812_MODE_VOLT_DUTY:
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case RS_22_812_MODE_AMP_DUTY:
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analog->mq = SR_MQ_DUTY_CYCLE;
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analog->unit = SR_UNIT_PERCENTAGE;
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break;
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case RS_22_812_MODE_WIDTH:
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case RS_22_812_MODE_VOLT_WIDTH:
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case RS_22_812_MODE_AMP_WIDTH:
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analog->mq = SR_MQ_PULSE_WIDTH;
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analog->unit = SR_UNIT_SECOND;
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case RS_22_812_MODE_TEMP:
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analog->mq = SR_MQ_TEMPERATURE;
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/* We need to reparse */
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*analog->data = lcdraw_to_double(rs_packet, READ_TEMP);
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analog->unit = rs_22_812_is_celsius(rs_packet)?
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SR_UNIT_CELSIUS:SR_UNIT_FAHRENHEIT;
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break;
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case RS_22_812_MODE_DBM:
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analog->mq = SR_MQ_POWER;
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analog->unit = SR_UNIT_DECIBEL_MW;
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analog->mqflags |= SR_MQFLAG_AC;
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break;
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default:
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sr_warn("radioshack-dmm: unkown mode: %d", rs_packet->mode);
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break;
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}
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if(rs_packet->info & RS_22_812_INFO_HOLD) {
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analog->mqflags |= SR_MQFLAG_HOLD;
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}
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if(rs_packet->digit4 & RS_22_812_DIG4_MAX) {
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analog->mqflags |= SR_MQFLAG_MAX;
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}
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if(rs_packet->indicatrix2 & RS_22_812_IND2_MIN) {
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analog->mqflags |= SR_MQFLAG_MIN;
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}
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if(rs_packet->info & RS_22_812_INFO_AUTO) {
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analog->mqflags |= SR_MQFLAG_AUTORANGE;
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}
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if (analog->mq != -1) {
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/* Got a measurement. */
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sr_spew("radioshack-dmm: val %f", rawval);
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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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devc->num_samples++;
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}
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g_free(analog->data);
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g_free(analog);
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}
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static void handle_new_data(rs_dev_ctx *devc, int fd)
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{
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int len;
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size_t i;
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size_t offset = 0;
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/* Try to get as much data as the buffer can hold */
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len = RS_DMM_BUFSIZE - devc->buflen;
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len = serial_read(fd, devc->buf + devc->buflen, len);
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if (len < 1) {
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sr_err("radioshack-dmm: serial port read error!");
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return;
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}
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devc->buflen += len;
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/* Now look for packets in that data */
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while((devc->buflen - offset) >= RS_22_812_PACKET_SIZE)
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{
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rs_22_812_packet * packet = (void *)(devc->buf + offset);
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if( rs_22_812_is_packet_valid(packet) )
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{
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rs_22_812_handle_packet(packet, devc);
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offset += RS_22_812_PACKET_SIZE;
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} else {
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offset++;
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}
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}
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/* If we have any data left, move it to the beginning of our buffer */
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for(i = 0; i < devc->buflen - offset; i++)
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devc->buf[i] = devc->buf[offset + i];
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devc->buflen -= offset;
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}
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SR_PRIV int radioshack_receive_data(int fd, int revents, void *cb_data)
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{
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const struct sr_dev_inst *sdi;
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struct dev_context *devc;
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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 (revents == G_IO_IN)
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{
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/* Serial data arrived. */
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handle_new_data(devc, fd);
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}
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if (devc->num_samples >= devc->limit_samples) {
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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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return TRUE;
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}
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