#include "libsigrok-internal.h"
#include "protocol.h"
-/* Byte 1 of the packet, and the modes it represents */
-#define IND1_HZ 0x80
-#define IND1_OHM 0x40
-#define IND1_KILO 0x20
-#define IND1_MEGA 0x10
-#define IND1_FARAD 0x08
-#define IND1_AMP 0x04
-#define IND1_VOLT 0x02
-#define IND1_MILI 0x01
-/* Byte 2 of the packet, and the modes it represents */
-#define IND2_MICRO 0x80
-#define IND2_NANO 0x40
-#define IND2_DBM 0x20
-#define IND2_SEC 0x10
-#define IND2_DUTY 0x08
-#define IND2_HFE 0x04
-#define IND2_REL 0x02
-#define IND2_MIN 0x01
-/* Byte 7 of the packet, and the modes it represents */
-#define INFO_BEEP 0x80
-#define INFO_DIODE 0x30
-#define INFO_BAT 0x20
-#define INFO_HOLD 0x10
-#define INFO_NEG 0x08
-#define INFO_AC 0x04
-#define INFO_RS232 0x02
-#define INFO_AUTO 0x01
-/* Instead of a decimal point, digit 4 carries the MAX flag */
-#define DIG4_MAX 0x08
-/* Mask to remove the decimal point from a digit */
-#define DP_MASK 0x08
-/* What the LCD values represent */
-#define LCD_0 0xd7
-#define LCD_1 0x50
-#define LCD_2 0xb5
-#define LCD_3 0xf1
-#define LCD_4 0x72
-#define LCD_5 0xe3
-#define LCD_6 0xe7
-#define LCD_7 0x51
-#define LCD_8 0xf7
-#define LCD_9 0xf3
-
-#define LCD_C 0x87
-#define LCD_E
-#define LCD_F
-#define LCD_h 0x66
-#define LCD_H 0x76
-#define LCD_I
-#define LCD_n
-#define LCD_P 0x37
-#define LCD_r
-
-enum {
- MODE_DC_V = 0,
- MODE_AC_V = 1,
- MODE_DC_UA = 2,
- MODE_DC_MA = 3,
- MODE_DC_A = 4,
- MODE_AC_UA = 5,
- MODE_AC_MA = 6,
- MODE_AC_A = 7,
- MODE_OHM = 8,
- MODE_FARAD = 9,
- MODE_HZ = 10,
- MODE_VOLT_HZ = 11,
- MODE_AMP_HZ = 12,
- MODE_DUTY = 13,
- MODE_VOLT_DUTY = 14,
- MODE_AMP_DUTY = 15,
- MODE_WIDTH = 16,
- MODE_VOLT_WIDTH = 17,
- MODE_AMP_WIDTH = 18,
- MODE_DIODE = 19,
- MODE_CONT = 20,
- MODE_HFE = 21,
- MODE_LOGIC = 22,
- MODE_DBM = 23,
- // MODE_EF = 24,
- MODE_TEMP = 25,
- MODE_INVALID = 26,
-};
-
-enum {
- READ_ALL,
- READ_TEMP,
-};
-
-static gboolean checksum_valid(const struct rs_22_812_packet *rs_packet)
-{
- uint8_t *raw;
- uint8_t sum = 0;
- int i;
-
- raw = (void *)rs_packet;
-
- for (i = 0; i < RS_22_812_PACKET_SIZE - 1; i++)
- sum += raw[i];
-
- /* This is just a funky constant added to the checksum. */
- sum += 57;
- sum -= rs_packet->checksum;
- return (sum == 0);
-}
-
-static gboolean selection_good(const struct rs_22_812_packet *rs_packet)
-{
- int count;
-
- /* Does the packet have more than one multiplier ? */
- count = 0;
- count += (rs_packet->indicatrix1 & IND1_KILO) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_MEGA) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_MILI) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_MICRO) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_NANO) ? 1 : 0;
- if (count > 1) {
- sr_err("More than one multiplier detected in packet.");
- return FALSE;
- }
-
- /* Does the packet "measure" more than one type of value? */
- count = 0;
- count += (rs_packet->indicatrix1 & IND1_HZ) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_OHM) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_FARAD) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_AMP) ? 1 : 0;
- count += (rs_packet->indicatrix1 & IND1_VOLT) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_DBM) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_SEC) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_DUTY) ? 1 : 0;
- count += (rs_packet->indicatrix2 & IND2_HFE) ? 1 : 0;
- if (count > 1) {
- sr_err("More than one measurement type detected in packet.");
- return FALSE;
- }
-
- return TRUE;
-}
-
-/*
- * Since the 22-812 does not identify itself in any way, shape, or form,
- * we really don't know for sure who is sending the data. We must use every
- * possible check to filter out bad packets, especially since detection of the
- * 22-812 depends on how well we can filter the packets.
- */
-SR_PRIV gboolean rs_22_812_packet_valid(const struct rs_22_812_packet *rs_packet)
-{
- /*
- * Check for valid mode first, before calculating the checksum.
- * No point calculating the checksum, if we know we'll reject the packet
- * */
- if (!(rs_packet->mode < MODE_INVALID))
- return FALSE;
-
- if (!checksum_valid(rs_packet)) {
- sr_spew("Packet with invalid checksum. Discarding.");
- return FALSE;
- }
-
- if (!selection_good(rs_packet)) {
- sr_spew("Packet with invalid selection bits. Discarding.");
- return FALSE;
- }
-
- return TRUE;
-}
-
-static uint8_t decode_digit(uint8_t raw_digit)
-{
- /* Take out the decimal point, so we can use a simple switch(). */
- raw_digit &= ~DP_MASK;
-
- switch (raw_digit) {
- case 0x00:
- case LCD_0:
- return 0;
- case LCD_1:
- return 1;
- case LCD_2:
- return 2;
- case LCD_3:
- return 3;
- case LCD_4:
- return 4;
- case LCD_5:
- return 5;
- case LCD_6:
- return 6;
- case LCD_7:
- return 7;
- case LCD_8:
- return 8;
- case LCD_9:
- return 9;
- default:
- sr_err("Invalid digit byte: 0x%02x.", raw_digit);
- return 0xff;
- }
-}
-
-static double lcd_to_double(const struct rs_22_812_packet *rs_packet, int type)
-{
- double rawval, multiplier = 1;
- uint8_t digit, raw_digit;
- gboolean dp_reached = FALSE;
- int i, end;
-
- /* end = 1: Don't parse last digit. end = 0: Parse all digits. */
- end = (type == READ_TEMP) ? 1 : 0;
-
- /* We have 4 digits, and we start from the most significant. */
- for (i = 3; i >= end; i--) {
- raw_digit = *(&(rs_packet->digit4) + i);
- digit = decode_digit(raw_digit);
- if (digit == 0xff) {
- rawval = NAN;
- break;
- }
- /*
- * Digit 1 does not have a decimal point. Instead, the decimal
- * point is used to indicate MAX, so we must avoid testing it.
- */
- if ((i < 3) && (raw_digit & DP_MASK))
- dp_reached = TRUE;
- if (dp_reached)
- multiplier /= 10;
- rawval = rawval * 10 + digit;
- }
- rawval *= multiplier;
- if (rs_packet->info & INFO_NEG)
- rawval *= -1;
-
- /* See if we need to multiply our raw value by anything. */
- if (rs_packet->indicatrix1 & IND2_NANO) {
- rawval *= 1E-9;
- } else if (rs_packet->indicatrix2 & IND2_MICRO) {
- rawval *= 1E-6;
- } else if (rs_packet->indicatrix1 & IND1_MILI) {
- rawval *= 1E-3;
- } else if (rs_packet->indicatrix1 & IND1_KILO) {
- rawval *= 1E3;
- } else if (rs_packet->indicatrix1 & IND1_MEGA) {
- rawval *= 1E6;
- }
-
- return rawval;
-}
-
-static gboolean is_celsius(struct rs_22_812_packet *rs_packet)
-{
- return ((rs_packet->digit4 & ~DP_MASK) == LCD_C);
-}
-
-static gboolean is_shortcirc(struct rs_22_812_packet *rs_packet)
-{
- return ((rs_packet->digit2 & ~DP_MASK) == LCD_h);
-}
-
-static gboolean is_logic_high(struct rs_22_812_packet *rs_packet)
-{
- sr_spew("Digit 2: 0x%02x.", rs_packet->digit2 & ~DP_MASK);
- return ((rs_packet->digit2 & ~DP_MASK) == LCD_H);
-}
-
-static void handle_packet(struct rs_22_812_packet *rs_packet,
+static void handle_packet(const uint8_t *rs_packet,
struct dev_context *devc)
{
- double rawval;
+ float rawval;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog *analog;
- rawval = lcd_to_double(rs_packet, READ_ALL);
-
/* TODO: Check malloc return value. */
analog = g_try_malloc0(sizeof(struct sr_datafeed_analog));
- analog->num_samples = 1;
/* TODO: Check malloc return value. */
- analog->data = g_try_malloc(sizeof(float));
- *analog->data = (float)rawval;
- analog->mq = -1;
- switch (rs_packet->mode) {
- case MODE_DC_V:
- analog->mq = SR_MQ_VOLTAGE;
- analog->unit = SR_UNIT_VOLT;
- analog->mqflags |= SR_MQFLAG_DC;
- break;
- case MODE_AC_V:
- analog->mq = SR_MQ_VOLTAGE;
- analog->unit = SR_UNIT_VOLT;
- analog->mqflags |= SR_MQFLAG_AC;
- break;
- case MODE_DC_UA:
- case MODE_DC_MA:
- case MODE_DC_A:
- analog->mq = SR_MQ_CURRENT;
- analog->unit = SR_UNIT_AMPERE;
- analog->mqflags |= SR_MQFLAG_DC;
- break;
- case MODE_AC_UA:
- case MODE_AC_MA:
- case MODE_AC_A:
- analog->mq = SR_MQ_CURRENT;
- analog->unit = SR_UNIT_AMPERE;
- analog->mqflags |= SR_MQFLAG_AC;
- break;
- case MODE_OHM:
- analog->mq = SR_MQ_RESISTANCE;
- analog->unit = SR_UNIT_OHM;
- break;
- case MODE_FARAD:
- analog->mq = SR_MQ_CAPACITANCE;
- analog->unit = SR_UNIT_FARAD;
- break;
- case MODE_CONT:
- analog->mq = SR_MQ_CONTINUITY;
- analog->unit = SR_UNIT_BOOLEAN;
- *analog->data = is_shortcirc(rs_packet);
- break;
- case MODE_DIODE:
- analog->mq = SR_MQ_VOLTAGE;
- analog->unit = SR_UNIT_VOLT;
- analog->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
- break;
- case MODE_HZ:
- case MODE_VOLT_HZ:
- case MODE_AMP_HZ:
- analog->mq = SR_MQ_FREQUENCY;
- analog->unit = SR_UNIT_HERTZ;
- break;
- case MODE_LOGIC:
- /*
- * No matter whether or not we have an actual voltage reading,
- * we are measuring voltage, so we set our MQ as VOLTAGE.
- */
- analog->mq = SR_MQ_VOLTAGE;
- if (!isnan(rawval)) {
- /* We have an actual voltage. */
- analog->unit = SR_UNIT_VOLT;
- } else {
- /* We have either HI or LOW. */
- analog->unit = SR_UNIT_BOOLEAN;
- *analog->data = is_logic_high(rs_packet);
- }
- break;
- case MODE_HFE:
- analog->mq = SR_MQ_GAIN;
- analog->unit = SR_UNIT_UNITLESS;
- break;
- case MODE_DUTY:
- case MODE_VOLT_DUTY:
- case MODE_AMP_DUTY:
- analog->mq = SR_MQ_DUTY_CYCLE;
- analog->unit = SR_UNIT_PERCENTAGE;
- break;
- case MODE_WIDTH:
- case MODE_VOLT_WIDTH:
- case MODE_AMP_WIDTH:
- analog->mq = SR_MQ_PULSE_WIDTH;
- analog->unit = SR_UNIT_SECOND;
- case MODE_TEMP:
- analog->mq = SR_MQ_TEMPERATURE;
- /* We need to reparse. */
- *analog->data = lcd_to_double(rs_packet, READ_TEMP);
- analog->unit = is_celsius(rs_packet) ?
- SR_UNIT_CELSIUS : SR_UNIT_FAHRENHEIT;
- break;
- case MODE_DBM:
- analog->mq = SR_MQ_POWER;
- analog->unit = SR_UNIT_DECIBEL_MW;
- analog->mqflags |= SR_MQFLAG_AC;
- break;
- default:
- sr_err("Unknown mode: %d.", rs_packet->mode);
- break;
- }
+ analog->num_samples = 1;
+ analog->mq = -1;
- if (rs_packet->info & INFO_HOLD)
- analog->mqflags |= SR_MQFLAG_HOLD;
- if (rs_packet->digit4 & DIG4_MAX)
- analog->mqflags |= SR_MQFLAG_MAX;
- if (rs_packet->indicatrix2 & IND2_MIN)
- analog->mqflags |= SR_MQFLAG_MIN;
- if (rs_packet->info & INFO_AUTO)
- analog->mqflags |= SR_MQFLAG_AUTORANGE;
+ sr_rs9lcd_parse(rs_packet, &rawval, analog, NULL);
+ analog->data = &rawval;
if (analog->mq != -1) {
/* Got a measurement. */
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
}
- g_free(analog->data);
g_free(analog);
}
{
int len;
size_t i, offset = 0;
- struct rs_22_812_packet *rs_packet;
+ uint8_t *rs_packet;
/* Try to get as much data as the buffer can hold. */
len = RS_DMM_BUFSIZE - devc->buflen;
/* Now look for packets in that data. */
while ((devc->buflen - offset) >= RS_22_812_PACKET_SIZE) {
rs_packet = (void *)(devc->buf + offset);
- if (rs_22_812_packet_valid(rs_packet)) {
+ if (sr_rs9lcd_packet_valid(rs_packet)) {
handle_packet(rs_packet, devc);
offset += RS_22_812_PACKET_SIZE;
} else {
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