* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#include <glib.h>
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-#include "radioshack-dmm.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>
+#include <glib.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+#include "radioshack-dmm.h"
+enum {
+ READ_ALL,
+ READ_TEMP,
+};
-static gboolean rs_22_812_is_checksum_valid(const rs_22_812_packet *data)
+static gboolean checksum_valid(const struct rs_22_812_packet *rs_packet)
{
- uint8_t *raw = (void *) data;
+ uint8_t *raw;
uint8_t sum = 0;
- size_t i;
- for(i = 0; i < RS_22_812_PACKET_SIZE - 1; i++)
+ 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 */
+
+ /* This is just a funky constant added to the checksum. */
sum += 57;
- sum -= data->checksum;
- return(sum == 0);
+ sum -= rs_packet->checksum;
+ return (sum == 0);
}
-static gboolean rs_22_812_is_mode_valid(rs_22_812_mode mode)
+static gboolean selection_good(const struct rs_22_812_packet *rs_packet)
{
- return(mode < RS_22_812_MODE_INVALID);
-}
+ int count;
-static gboolean rs_22_812_is_selection_good(const rs_22_812_packet *data)
-{
- int n_postfix = 0;
- int n_type = 0;
/* Does the packet have more than one multiplier ? */
- if(data->indicatrix1 & RS_22_812_IND1_KILO)
- n_postfix++;
- if(data->indicatrix1 & RS_22_812_IND1_MEGA)
- n_postfix++;
- if(data->indicatrix1 & RS_22_812_IND1_MILI)
- n_postfix++;
- if(data->indicatrix2 & RS_22_812_IND2_MICRO)
- n_postfix++;
- if(data->indicatrix2 & RS_22_812_IND2_NANO)
- n_postfix++;
- if(n_postfix > 1)
+ count = 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_KILO) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_MEGA) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_MILI) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_IND2_MICRO) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_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 ?*/
- if(data->indicatrix1 & RS_22_812_IND1_HZ)
- n_type++;
- if(data->indicatrix1 & RS_22_812_IND1_OHM)
- n_type++;
- if(data->indicatrix1 & RS_22_812_IND1_FARAD)
- n_type++;
- if(data->indicatrix1 & RS_22_812_IND1_AMP)
- n_type++;
- if(data->indicatrix1 & RS_22_812_IND1_VOLT)
- n_type++;
- if(data->indicatrix2 & RS_22_812_IND2_DBM)
- n_type++;
- if(data->indicatrix2 & RS_22_812_IND2_SEC)
- n_type++;
- if(data->indicatrix2 & RS_22_812_IND2_DUTY)
- n_type++;
- if(data->indicatrix2 & RS_22_812_IND2_HFE)
- n_type++;
- if(n_type > 1)
+ /* Does the packet "measure" more than one type of value? */
+ count = 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_HZ) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_OHM) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_FARAD) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_AMP) ? 1 : 0;
+ count += (rs_packet->indicatrix1 & RS_22_812_IND1_VOLT) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_IND2_DBM) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_IND2_SEC) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_IND2_DUTY) ? 1 : 0;
+ count += (rs_packet->indicatrix2 & RS_22_812_IND2_HFE) ? 1 : 0;
+ if (count > 1) {
+ sr_err("More than one measurement type detected in packet.");
return FALSE;
+ }
- /* OK, no duplicates */
return TRUE;
}
-/* Since the RS 22-812 does not identify itslef in any way shape, or form,
+/*
+ * 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_is_packet_valid(const rs_22_812_packet *packet)
+ * 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)
{
- /* Unfortunately, the packet doesn't have a signature, so we must
- * compute its checksum first */
- if(!rs_22_812_is_checksum_valid(packet))
+ if (!checksum_valid(rs_packet))
return FALSE;
- if(!rs_22_812_is_mode_valid(packet->mode))
+ if (!(rs_packet->mode < RS_22_812_MODE_INVALID))
return FALSE;
- if(!rs_22_812_is_selection_good(packet)) {
+ if (!selection_good(rs_packet))
return FALSE;
- }
- /* Made it here, huh? Then this looks to be a valid packet */
+
return TRUE;
}
-static uint8_t rs_22_812_to_digit(uint8_t raw_digit)
+static uint8_t decode_digit(uint8_t raw_digit)
{
- /* Take out the decimal point, so we can use a simple switch() */
+ /* Take out the decimal point, so we can use a simple switch(). */
raw_digit &= ~RS_22_812_DP_MASK;
- switch(raw_digit)
- {
+
+ switch (raw_digit) {
case 0x00:
case RS_22_812_LCD_0:
return 0;
case RS_22_812_LCD_9:
return 9;
default:
+ sr_err("Invalid digit byte: 0x%02x.", raw_digit);
return 0xff;
}
}
-typedef enum {
- READ_ALL,
- READ_TEMP,
-} value_type;
-
-static double lcdraw_to_double(rs_22_812_packet *rs_packet, value_type type)
+static double lcdraw_to_double(const struct rs_22_812_packet *rs_packet,
+ int type)
{
- /* *********************************************************************
- * Get a raw floating point value from the data
- **********************************************************************/
- double rawval;
- double multiplier = 1;
- uint8_t digit;
+ double rawval, multiplier = 1;
+ uint8_t digit, raw_digit;
gboolean dp_reached = FALSE;
int i, end;
- switch(type) {
- case READ_TEMP:
- /* Do not parse the last digit */
- end = 1;
- break;
- case READ_ALL:
- default:
- /* Parse all digits */
- end = 0;
- }
- /* We have 4 digits, and we start from the most significant */
- for(i = 3; i >= end; i--)
- {
- uint8_t raw_digit = *(&(rs_packet->digit4) + i);
- digit = rs_22_812_to_digit(raw_digit);
- if(digit == 0xff) {
+
+ /* 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 & RS_22_812_DP_MASK) )
+ /*
+ * 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 & RS_22_812_DP_MASK))
dp_reached = TRUE;
- if(dp_reached) multiplier /= 10;
+ if (dp_reached)
+ multiplier /= 10;
rawval = rawval * 10 + digit;
}
rawval *= multiplier;
- if(rs_packet->info & RS_22_812_INFO_NEG)
+ if (rs_packet->info & RS_22_812_INFO_NEG)
rawval *= -1;
- /* See if we need to multiply our raw value by anything */
- if(rs_packet->indicatrix1 & RS_22_812_IND2_NANO) {
+ /* See if we need to multiply our raw value by anything. */
+ if (rs_packet->indicatrix1 & RS_22_812_IND2_NANO) {
rawval *= 1E-9;
- } else if(rs_packet->indicatrix2 & RS_22_812_IND2_MICRO) {
+ } else if (rs_packet->indicatrix2 & RS_22_812_IND2_MICRO) {
rawval *= 1E-6;
- } else if(rs_packet->indicatrix1 & RS_22_812_IND1_MILI) {
+ } else if (rs_packet->indicatrix1 & RS_22_812_IND1_MILI) {
rawval *= 1E-3;
- } else if(rs_packet->indicatrix1 & RS_22_812_IND1_KILO) {
+ } else if (rs_packet->indicatrix1 & RS_22_812_IND1_KILO) {
rawval *= 1E3;
- } else if(rs_packet->indicatrix1 & RS_22_812_IND1_MEGA) {
+ } else if (rs_packet->indicatrix1 & RS_22_812_IND1_MEGA) {
rawval *= 1E6;
}
return rawval;
}
-static gboolean rs_22_812_is_celsius(rs_22_812_packet *rs_packet)
+static gboolean is_celsius(struct rs_22_812_packet *rs_packet)
{
- return((rs_packet->digit4 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_C);
+ return ((rs_packet->digit4 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_C);
}
-static gboolean rs_22_812_is_shortcirc(rs_22_812_packet *rs_packet)
+static gboolean is_shortcirc(struct rs_22_812_packet *rs_packet)
{
- return((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_h);
+ return ((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_h);
}
-static gboolean rs_22_812_is_logic_high(rs_22_812_packet *rs_packet)
+static gboolean is_logic_high(struct rs_22_812_packet *rs_packet)
{
- sr_spew("digit 2: %x", rs_packet->digit2 & ~RS_22_812_DP_MASK);
- return((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_H);
+ sr_spew("Digit 2: 0x%02x.", rs_packet->digit2 & ~RS_22_812_DP_MASK);
+ return ((rs_packet->digit2 & ~RS_22_812_DP_MASK) == RS_22_812_LCD_H);
}
-static void rs_22_812_handle_packet(rs_22_812_packet *rs_packet,
- rs_dev_ctx *devc)
+static void handle_packet(struct rs_22_812_packet *rs_packet,
+ struct dev_context *devc)
{
- double rawval = lcdraw_to_double(rs_packet, READ_ALL);
- /* *********************************************************************
- * Now see what the value means, and pass that on
- **********************************************************************/
+ double rawval;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog *analog;
+ rawval = lcdraw_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) {
+ switch (rs_packet->mode) {
case RS_22_812_MODE_DC_V:
analog->mq = SR_MQ_VOLTAGE;
analog->unit = SR_UNIT_VOLT;
case RS_22_812_MODE_CONT:
analog->mq = SR_MQ_CONTINUITY;
analog->unit = SR_UNIT_BOOLEAN;
- *analog->data = rs_22_812_is_shortcirc(rs_packet);
+ *analog->data = is_shortcirc(rs_packet);
break;
case RS_22_812_MODE_DIODE:
analog->mq = SR_MQ_VOLTAGE;
analog->unit = SR_UNIT_HERTZ;
break;
case RS_22_812_MODE_LOGIC:
- /* No matter whether or not we have an actual voltage reading,
- * we are measuring voltage, so we set our MQ as VOLTAGE */
+ /*
+ * 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 */
+ if (!isnan(rawval)) {
+ /* We have an actual voltage. */
analog->unit = SR_UNIT_VOLT;
} else {
- /* We have either HI or LOW */
+ /* We have either HI or LOW. */
analog->unit = SR_UNIT_BOOLEAN;
- *analog->data = rs_22_812_is_logic_high(rs_packet);
+ *analog->data = is_logic_high(rs_packet);
}
break;
case RS_22_812_MODE_HFE:
analog->unit = SR_UNIT_SECOND;
case RS_22_812_MODE_TEMP:
analog->mq = SR_MQ_TEMPERATURE;
- /* We need to reparse */
+ /* We need to reparse. */
*analog->data = lcdraw_to_double(rs_packet, READ_TEMP);
- analog->unit = rs_22_812_is_celsius(rs_packet)?
- SR_UNIT_CELSIUS:SR_UNIT_FAHRENHEIT;
+ analog->unit = is_celsius(rs_packet) ?
+ SR_UNIT_CELSIUS : SR_UNIT_FAHRENHEIT;
break;
case RS_22_812_MODE_DBM:
analog->mq = SR_MQ_POWER;
analog->mqflags |= SR_MQFLAG_AC;
break;
default:
- sr_warn("radioshack-dmm: unkown mode: %d", rs_packet->mode);
+ sr_err("Unknown mode: %d.", rs_packet->mode);
break;
}
- if(rs_packet->info & RS_22_812_INFO_HOLD) {
+ if (rs_packet->info & RS_22_812_INFO_HOLD)
analog->mqflags |= SR_MQFLAG_HOLD;
- }
- if(rs_packet->digit4 & RS_22_812_DIG4_MAX) {
+ if (rs_packet->digit4 & RS_22_812_DIG4_MAX)
analog->mqflags |= SR_MQFLAG_MAX;
- }
- if(rs_packet->indicatrix2 & RS_22_812_IND2_MIN) {
+ if (rs_packet->indicatrix2 & RS_22_812_IND2_MIN)
analog->mqflags |= SR_MQFLAG_MIN;
- }
- if(rs_packet->info & RS_22_812_INFO_AUTO) {
+ if (rs_packet->info & RS_22_812_INFO_AUTO)
analog->mqflags |= SR_MQFLAG_AUTORANGE;
- }
if (analog->mq != -1) {
/* Got a measurement. */
- sr_spew("radioshack-dmm: val %f", rawval);
+ sr_spew("Value: %f.", rawval);
packet.type = SR_DF_ANALOG;
packet.payload = analog;
sr_session_send(devc->cb_data, &packet);
g_free(analog);
}
-static void handle_new_data(rs_dev_ctx *devc, int fd)
+static void handle_new_data(struct dev_context *devc, int fd)
{
int len;
- size_t i;
- size_t offset = 0;
- /* Try to get as much data as the buffer can hold */
+ size_t i, offset = 0;
+ struct rs_22_812_packet *rs_packet;
+
+ /* Try to get as much data as the buffer can hold. */
len = RS_DMM_BUFSIZE - devc->buflen;
len = serial_read(fd, devc->buf + devc->buflen, len);
if (len < 1) {
- sr_err("radioshack-dmm: serial port read error!");
+ sr_err("Serial port read error.");
return;
}
devc->buflen += len;
- /* Now look for packets in that data */
- while((devc->buflen - offset) >= RS_22_812_PACKET_SIZE)
- {
- rs_22_812_packet * packet = (void *)(devc->buf + offset);
- if( rs_22_812_is_packet_valid(packet) )
- {
- rs_22_812_handle_packet(packet, devc);
+ /* 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)) {
+ handle_packet(rs_packet, devc);
offset += RS_22_812_PACKET_SIZE;
} else {
offset++;
}
}
- /* If we have any data left, move it to the beginning of our buffer */
- for(i = 0; i < devc->buflen - offset; i++)
+ /* If we have any data left, move it to the beginning of our buffer. */
+ for (i = 0; i < devc->buflen - offset; i++)
devc->buf[i] = devc->buf[offset + i];
devc->buflen -= offset;
}
-SR_PRIV int radioshack_receive_data(int fd, int revents, void *cb_data)
+SR_PRIV int radioshack_dmm_receive_data(int fd, int revents, void *cb_data)
{
- const struct sr_dev_inst *sdi;
+ struct sr_dev_inst *sdi;
struct dev_context *devc;
if (!(sdi = cb_data))
if (!(devc = sdi->priv))
return TRUE;
- if (revents == G_IO_IN)
- {
+ if (revents == G_IO_IN) {
/* Serial data arrived. */
handle_new_data(devc, fd);
}
return TRUE;
}
-
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