323 lines
9.0 KiB
C
323 lines
9.0 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 Uwe Hermann <uwe@hermann-uwe.de>
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Fortune Semiconductor FS9721_LP3/FS9721B protocol parser.
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*
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* FS9721_LP3: 4000 counts (3 3/4 digits)
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* FS9721B/Q100: 2400 counts (3 2/3 digits)
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*
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* Same for both chips:
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* - Packages: Bare die (78 pins) or QFP-100
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* - Communication parameters: Unidirectional, 2400/8n1
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* - The protocol seems to be exactly the same.
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*/
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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/* Message logging helpers with driver-specific prefix string. */
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#define DRIVER_LOG_DOMAIN "fs9721: "
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#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
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#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
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#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
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static int parse_digit(uint8_t b)
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{
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switch (b) {
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case 0x7d:
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return 0;
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case 0x05:
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return 1;
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case 0x5b:
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return 2;
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case 0x1f:
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return 3;
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case 0x27:
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return 4;
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case 0x3e:
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return 5;
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case 0x7e:
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return 6;
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case 0x15:
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return 7;
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case 0x7f:
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return 8;
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case 0x3f:
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return 9;
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default:
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sr_err("Invalid digit byte: 0x%02x.", b);
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return -1;
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}
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}
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/**
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* Parse the numerical value from a protocol packet.
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*
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* @param buf Buffer containing the 14-byte protocol packet.
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* @param result Pointer to a float variable. That variable will contain the
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* result value upon parsing success.
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*
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* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the result
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* variable contents are undefined and should not be used.
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*/
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static int parse_value(const uint8_t *buf, float *result)
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{
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int i, sign, intval = 0, digits[4];
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uint8_t digit_bytes[4];
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float floatval;
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/* Byte 1: LCD SEG2 */
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sign = ((buf[1] & (1 << 3)) != 0) ? -1 : 1;
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/*
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* Bytes 1-8: Value (4 decimal digits, sign, decimal point)
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*
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* Over limit: "0L" (LCD), 0x00 0x7d 0x68 0x00 (digit bytes).
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*/
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/* Merge the two nibbles for a digit into one byte. */
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for (i = 0; i < 4; i++) {
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digit_bytes[i] = ((buf[1 + (i * 2)] & 0x0f) << 4);
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digit_bytes[i] |= (buf[1 + (i * 2) + 1] & 0x0f);
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/* Bit 7 in the byte is not part of the digit. */
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digit_bytes[i] &= ~(1 << 7);
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}
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/* Check for "OL". */
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if (digit_bytes[0] == 0x00 && digit_bytes[1] == 0x7d &&
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digit_bytes[2] == 0x68 && digit_bytes[3] == 0x00) {
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sr_spew("Over limit.");
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*result = INFINITY;
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return SR_OK;
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}
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/* Parse the digits. */
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for (i = 0; i < 4; i++)
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digits[i] = parse_digit(digit_bytes[i]);
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sr_spew("Digits: %02x %02x %02x %02x (%d%d%d%d).",
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digit_bytes[0], digit_bytes[1], digit_bytes[2], digit_bytes[3],
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digits[0], digits[1], digits[2], digits[3]);
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/* Merge all digits into an integer value. */
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for (i = 0; i < 4; i++) {
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intval *= 10;
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intval += digits[i];
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}
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/* Store the value in a float variable. */
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floatval = (float)intval;
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/* Decimal point position. */
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if ((buf[3] & (1 << 3)) != 0) {
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floatval /= 1000;
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sr_spew("Decimal point after first digit.");
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} else if ((buf[5] & (1 << 3)) != 0) {
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floatval /= 100;
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sr_spew("Decimal point after second digit.");
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} else if ((buf[7] & (1 << 3)) != 0) {
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floatval /= 10;
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sr_spew("Decimal point after third digit.");
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} else {
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sr_spew("No decimal point in the number.");
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}
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/* Apply sign. */
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floatval *= sign;
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sr_spew("The display value is %f.", floatval);
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*result = floatval;
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return SR_OK;
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}
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/**
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* Parse various flags in a protocol packet.
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*
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* @param buf Buffer containing the 14-byte protocol packet.
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* @param floatval Pointer to a float variable which should contain the value
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* parsed using parse_value(). That variable will be modified
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* in-place depending on the flags in the protocol packet.
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* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
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* filled with the relevant data according to the flags in the
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* protocol packet.
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*
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* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the 'floatval'
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* and 'analog' variable contents are undefined and should not be used.
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*/
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static int parse_flags(const uint8_t *buf, float *floatval,
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struct sr_datafeed_analog *analog)
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{
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gboolean is_ac, is_dc, is_auto, is_rs232, is_micro, is_nano, is_kilo;
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gboolean is_diode, is_milli, is_percent, is_mega, is_beep, is_farad;
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gboolean is_ohm, is_rel, is_hold, is_ampere, is_volt, is_hz, is_bat;
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gboolean is_c2c1_11, is_c2c1_10, is_c2c1_01, is_c2c1_00;
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/* Byte 0: LCD SEG1 */
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is_ac = (buf[0] & (1 << 3)) != 0;
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is_dc = (buf[0] & (1 << 2)) != 0;
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is_auto = (buf[0] & (1 << 1)) != 0;
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is_rs232 = (buf[0] & (1 << 0)) != 0;
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/* Byte 9: LCD SEG10 */
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is_micro = (buf[9] & (1 << 3)) != 0;
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is_nano = (buf[9] & (1 << 2)) != 0;
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is_kilo = (buf[9] & (1 << 1)) != 0;
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is_diode = (buf[9] & (1 << 0)) != 0;
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/* Byte 10: LCD SEG11 */
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is_milli = (buf[10] & (1 << 3)) != 0;
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is_percent = (buf[10] & (1 << 2)) != 0;
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is_mega = (buf[10] & (1 << 1)) != 0;
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is_beep = (buf[10] & (1 << 0)) != 0;
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/* Byte 11: LCD SEG12 */
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is_farad = (buf[11] & (1 << 3)) != 0;
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is_ohm = (buf[11] & (1 << 2)) != 0;
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is_rel = (buf[11] & (1 << 1)) != 0;
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is_hold = (buf[11] & (1 << 0)) != 0;
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/* Byte 12: LCD SEG13 */
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is_ampere = (buf[12] & (1 << 3)) != 0;
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is_volt = (buf[12] & (1 << 2)) != 0;
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is_hz = (buf[12] & (1 << 1)) != 0;
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is_bat = (buf[12] & (1 << 0)) != 0;
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/* Byte 13: LCD SEG14 */
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is_c2c1_11 = (buf[13] & (1 << 3)) != 0;
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is_c2c1_10 = (buf[13] & (1 << 2)) != 0;
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is_c2c1_01 = (buf[13] & (1 << 1)) != 0;
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is_c2c1_00 = (buf[13] & (1 << 0)) != 0;
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/* Factors */
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if (is_nano)
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*floatval /= 1000000000;
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if (is_micro)
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*floatval /= 1000000;
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if (is_milli)
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*floatval /= 1000;
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if (is_kilo)
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*floatval *= 1000;
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if (is_mega)
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*floatval *= 1000000;
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/* Measurement modes */
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if (is_volt) {
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analog->mq = SR_MQ_VOLTAGE;
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analog->unit = SR_UNIT_VOLT;
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}
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if (is_ampere) {
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analog->mq = SR_MQ_CURRENT;
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analog->unit = SR_UNIT_AMPERE;
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}
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if (is_ohm) {
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analog->mq = SR_MQ_RESISTANCE;
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analog->unit = SR_UNIT_OHM;
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}
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if (is_hz) {
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analog->mq = SR_MQ_FREQUENCY;
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analog->unit = SR_UNIT_HERTZ;
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}
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if (is_farad) {
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analog->mq = SR_MQ_CAPACITANCE;
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analog->unit = SR_UNIT_FARAD;
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}
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if (is_beep) {
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analog->mq = SR_MQ_CONTINUITY;
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analog->unit = SR_UNIT_BOOLEAN;
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*floatval = (*floatval < 0.0) ? 0.0 : 1.0;
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}
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if (is_diode) {
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analog->mq = SR_MQ_VOLTAGE;
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analog->unit = SR_UNIT_VOLT;
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}
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if (is_percent) {
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analog->mq = SR_MQ_DUTY_CYCLE;
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analog->unit = SR_UNIT_PERCENTAGE;
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}
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/* Measurement related flags */
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if (is_ac)
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analog->mqflags |= SR_MQFLAG_AC;
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if (is_dc)
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analog->mqflags |= SR_MQFLAG_DC;
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if (is_auto)
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analog->mqflags |= SR_MQFLAG_AUTORANGE;
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if (is_hold)
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analog->mqflags |= SR_MQFLAG_HOLD;
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if (is_rel)
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analog->mqflags |= SR_MQFLAG_RELATIVE;
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/* Other flags */
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if (is_rs232)
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sr_spew("RS232 enabled.");
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if (is_bat)
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sr_spew("Battery is low.");
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if (is_c2c1_00)
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sr_spew("User-defined LCD symbol 0 is active.");
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if (is_c2c1_01)
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sr_spew("User-defined LCD symbol 1 is active.");
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if (is_c2c1_10)
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sr_spew("User-defined LCD symbol 2 is active.");
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if (is_c2c1_11)
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sr_spew("User-defined LCD symbol 3 is active.");
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return SR_OK;
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}
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/**
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* Parse a protocol packet.
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*
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* @param buf Buffer containing the 14-byte protocol packet.
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* @param floatval Pointer to a float variable. That variable will be modified
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* in-place depending on the protocol packet.
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* @param analog Pointer to a struct sr_datafeed_analog. The struct will be
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* filled with data according to the protocol packet.
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*
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* @return SR_OK upon success, SR_ERR upon failure. Upon errors, the
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* 'analog' variable contents are undefined and should not be used.
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*/
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SR_PRIV int sr_dmm_parse_fs9721(const uint8_t *buf, float *floatval,
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struct sr_datafeed_analog *analog)
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{
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int ret;
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if ((ret = parse_value(buf, floatval)) != SR_OK) {
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sr_err("Error parsing value: %d.", ret);
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return ret;
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}
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if ((ret = parse_flags(buf, floatval, analog)) != SR_OK) {
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sr_err("Error parsing flags: %d.", ret);
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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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