/* TODO: How to compute the checksum? Hardware seems to ignore it. */
/* Request reading. */
- written = serial_write_blocking(serial, &cmdout, sizeof(cmdout), 0);
+ written = serial_write_blocking(serial, &cmdout, sizeof(cmdout),
+ serial_timeout(serial, sizeof(cmdout)));
if (written != sizeof(cmdout))
return SR_ERR;
int i;
uint8_t chksum = 0;
uint8_t *payload;
-
+
payload = (uint8_t *)(buf + sizeof(struct brymen_header));
hdr = (void *)buf;
tail = (void *)(payload + hdr->len);
-
+
for (i = 0; i< hdr->len; i++)
chksum ^= payload[i];
-
+
if (tail->checksum != chksum) {
sr_dbg("Packet has invalid checksum 0x%.2x. Expected 0x%.2x.",
chksum, tail->checksum);
return FALSE;
}
-
+
return TRUE;
}
-static int parse_value(const char *strbuf, int len, float *floatval)
+static int parse_value(const char *txt, size_t len, float *floatval)
{
- int s, d;
- char str[32];
+ const char *txt_end;
+ char c, buf[32], *dst;
+ int ret;
- if (strstr(strbuf, "OL")) {
- sr_dbg("Overlimit.");
- *floatval = INFINITY;
- return SR_OK;
+ /*
+ * The input text is not NUL terminated, the checksum follows
+ * the value text field. Spaces may interfere with the text to
+ * number conversion, especially with exponent parsing. Copy the
+ * input data to a terminated text buffer and strip spaces in the
+ * process, before running ASCIIZ string operations.
+ */
+ if (len >= sizeof(buf)) {
+ sr_err("Insufficient text conversion buffer size.");
+ return SR_ERR_BUG;
}
+ txt_end = txt + len;
+ dst = &buf[0];
+ while (txt < txt_end && *txt) {
+ c = *txt++;
+ if (c == ' ')
+ continue;
+ *dst++ = c;
+ }
+ *dst = '\0';
- memset(str, 0, sizeof(str));
- /* Spaces may interfere with parsing the exponent. Strip them. */
- for (s = 0, d = 0; s < len; s++) {
- if (strbuf[s] != ' ')
- str[d++] = strbuf[s];
+ /* Check for overflow, or get the number value. */
+ if (strstr(buf, "+OL")) {
+ *floatval = +INFINITY;
+ return SR_OK;
}
- if (sr_atof_ascii(str, floatval) != SR_OK)
- return SR_ERR;
+ if (strstr(buf, "-OL")) {
+ *floatval = -INFINITY;
+ return SR_OK;
+ }
+ if (strstr(buf, "OL")) {
+ *floatval = INFINITY;
+ return SR_OK;
+ }
+ ret = sr_atof_ascii(buf, floatval);
+ if (ret != SR_OK)
+ return ret;
return SR_OK;
}
-static void parse_flags(const uint8_t *buf, struct brymen_flags *info)
+static void parse_flags(const uint8_t *bfunc, struct brymen_flags *info)
{
- info->is_low_batt = (buf[4 + 3] & (1 << 7)) != 0;
-
- info->is_decibel = (buf[4 + 1] & (1 << 5)) != 0;
- info->is_duty_cycle = (buf[4 + 1] & (1 << 3)) != 0;
- info->is_hertz = (buf[4 + 1] & (1 << 2)) != 0;
- info->is_amp = (buf[4 + 1] & (1 << 1)) != 0;
- info->is_beep = (buf[4 + 1] & (1 << 0)) != 0;
-
- info->is_ohm = (buf[4 + 0] & (1 << 7)) != 0;
- info->is_fahrenheit = (buf[4 + 0] & (1 << 6)) != 0;
- info->is_celsius = (buf[4 + 0] & (1 << 5)) != 0;
- info->is_diode = (buf[4 + 0] & (1 << 4)) != 0;
- info->is_capacitance = (buf[4 + 0] & (1 << 3)) != 0;
- info->is_volt = (buf[4 + 0] & (1 << 2)) != 0;
- info->is_dc = (buf[4 + 0] & (1 << 1)) != 0;
- info->is_ac = (buf[4 + 0] & (1 << 0)) != 0;
+ info->is_low_batt = (bfunc[3] & (1 << 7)) != 0;
+
+ info->is_decibel = (bfunc[1] & (1 << 5)) != 0;
+ info->is_duty_cycle = (bfunc[1] & (1 << 3)) != 0;
+ info->is_hertz = (bfunc[1] & (1 << 2)) != 0;
+ info->is_amp = (bfunc[1] & (1 << 1)) != 0;
+ info->is_beep = (bfunc[1] & (1 << 0)) != 0;
+
+ info->is_ohm = (bfunc[0] & (1 << 7)) != 0;
+ info->is_fahrenheit = (bfunc[0] & (1 << 6)) != 0;
+ info->is_celsius = (bfunc[0] & (1 << 5)) != 0;
+ info->is_diode = (bfunc[0] & (1 << 4)) != 0;
+ info->is_capacitance = (bfunc[0] & (1 << 3)) != 0;
+ info->is_volt = (bfunc[0] & (1 << 2)) != 0;
+ info->is_dc = (bfunc[0] & (1 << 1)) != 0;
+ info->is_ac = (bfunc[0] & (1 << 0)) != 0;
}
SR_PRIV int brymen_parse(const uint8_t *buf, float *floatval,
struct brymen_flags flags;
struct brymen_header *hdr;
uint8_t *bfunc;
- int asciilen;
+ const char *txt;
+ int txtlen;
+ int ret;
(void)info;
hdr = (void *)buf;
bfunc = (uint8_t *)(buf + sizeof(struct brymen_header));
-
- analog->mqflags = 0;
-
- /* Give some debug info about the package. */
- asciilen = hdr->len - 4;
- sr_dbg("DMM flags: %.2x %.2x %.2x %.2x",
- bfunc[3], bfunc[2], bfunc[1], bfunc[0]);
- /* Value is an ASCII string. */
- sr_dbg("DMM packet: \"%.*s\"", asciilen, bfunc + 4);
-
- parse_flags(buf, &flags);
- if (parse_value((const char *)(bfunc + 4), asciilen, floatval) != SR_OK)
+ txt = (const char *)&bfunc[4];
+ txtlen = hdr->len - 4;
+ sr_dbg("DMM bfunc: %02x %02x %02x %02x, text '%.*s'",
+ bfunc[3], bfunc[2], bfunc[1], bfunc[0], txtlen, txt);
+
+ memset(&flags, 0, sizeof(flags));
+ parse_flags(bfunc, &flags);
+ ret = parse_value(txt, txtlen, floatval);
+ sr_dbg("floatval: %f, ret %d", *floatval, ret);
+ if (ret != SR_OK)
return SR_ERR;
+ analog->meaning->mqflags = 0;
if (flags.is_volt) {
- analog->mq = SR_MQ_VOLTAGE;
- analog->unit = SR_UNIT_VOLT;
+ analog->meaning->mq = SR_MQ_VOLTAGE;
+ analog->meaning->unit = SR_UNIT_VOLT;
}
if (flags.is_amp) {
- analog->mq = SR_MQ_CURRENT;
- analog->unit = SR_UNIT_AMPERE;
+ analog->meaning->mq = SR_MQ_CURRENT;
+ analog->meaning->unit = SR_UNIT_AMPERE;
}
if (flags.is_ohm) {
if (flags.is_beep)
- analog->mq = SR_MQ_CONTINUITY;
+ analog->meaning->mq = SR_MQ_CONTINUITY;
else
- analog->mq = SR_MQ_RESISTANCE;
- analog->unit = SR_UNIT_OHM;
+ analog->meaning->mq = SR_MQ_RESISTANCE;
+ analog->meaning->unit = SR_UNIT_OHM;
}
if (flags.is_hertz) {
- analog->mq = SR_MQ_FREQUENCY;
- analog->unit = SR_UNIT_HERTZ;
+ analog->meaning->mq = SR_MQ_FREQUENCY;
+ analog->meaning->unit = SR_UNIT_HERTZ;
}
if (flags.is_duty_cycle) {
- analog->mq = SR_MQ_DUTY_CYCLE;
- analog->unit = SR_UNIT_PERCENTAGE;
+ analog->meaning->mq = SR_MQ_DUTY_CYCLE;
+ analog->meaning->unit = SR_UNIT_PERCENTAGE;
}
if (flags.is_capacitance) {
- analog->mq = SR_MQ_CAPACITANCE;
- analog->unit = SR_UNIT_FARAD;
+ analog->meaning->mq = SR_MQ_CAPACITANCE;
+ analog->meaning->unit = SR_UNIT_FARAD;
}
if (flags.is_fahrenheit) {
- analog->mq = SR_MQ_TEMPERATURE;
- analog->unit = SR_UNIT_FAHRENHEIT;
+ analog->meaning->mq = SR_MQ_TEMPERATURE;
+ analog->meaning->unit = SR_UNIT_FAHRENHEIT;
}
if (flags.is_celsius) {
- analog->mq = SR_MQ_TEMPERATURE;
- analog->unit = SR_UNIT_CELSIUS;
+ analog->meaning->mq = SR_MQ_TEMPERATURE;
+ analog->meaning->unit = SR_UNIT_CELSIUS;
}
if (flags.is_capacitance) {
- analog->mq = SR_MQ_CAPACITANCE;
- analog->unit = SR_UNIT_FARAD;
+ analog->meaning->mq = SR_MQ_CAPACITANCE;
+ analog->meaning->unit = SR_UNIT_FARAD;
}
/*
* identify the value as ohm, not dBmW.
*/
if (flags.is_decibel && !flags.is_ohm) {
- analog->mq = SR_MQ_POWER;
- analog->unit = SR_UNIT_DECIBEL_MW;
+ analog->meaning->mq = SR_MQ_POWER;
+ analog->meaning->unit = SR_UNIT_DECIBEL_MW;
/*
* For some reason, dBm measurements are sent by the multimeter
* with a value three orders of magnitude smaller than the
}
if (flags.is_diode)
- analog->mqflags |= SR_MQFLAG_DIODE;
+ analog->meaning->mqflags |= SR_MQFLAG_DIODE | SR_MQFLAG_DC;
/* We can have both AC+DC in a single measurement. */
if (flags.is_ac)
- analog->mqflags |= SR_MQFLAG_AC;
+ analog->meaning->mqflags |= SR_MQFLAG_AC;
if (flags.is_dc)
- analog->mqflags |= SR_MQFLAG_DC;
+ analog->meaning->mqflags |= SR_MQFLAG_DC;
if (flags.is_low_batt)
- sr_info("Low battery!");
+ sr_warn("Low battery!");
return SR_OK;
}
projects / libsigrok.git / blobdiff