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ut372: Support count mode.

This commit is contained in:
Martin Ling 2015-03-01 23:20:21 +00:00
parent b9c10ae18b
commit 12318aab96
1 changed files with 19 additions and 8 deletions
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27
src/dmm/ut372.c
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@ -48,6 +48,7 @@ uint8_t lookup[] = {
#define FLAGS1_HOLD_MASK (1 << 2)
#define FLAGS2_RPM_MASK (1 << 0)
#define FLAGS2_COUNT_MASK (1 << 1)
#define FLAGS2_MAX_MASK (1 << 4)
#define FLAGS2_MIN_MASK (1 << 5)
#define FLAGS2_AVE_MASK (1 << 6)
@ -71,7 +72,18 @@ static uint8_t decode_pair(const uint8_t *buf)
SR_PRIV gboolean sr_ut372_packet_valid(const uint8_t *buf)
{
return (buf[25] == '\r' && buf[26] == '\n');
uint8_t flags2;
if (!(buf[25] == '\r' && buf[26] == '\n'))
return FALSE;
flags2 = decode_pair(buf + 23);
if (!(flags2 & (FLAGS2_RPM_MASK | FLAGS2_COUNT_MASK)))
/* Device is in the setup menu - no valid data shown. */
return FALSE;
return TRUE;
}
SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
@ -85,10 +97,12 @@ SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
flags1 = decode_pair(buf + 21);
flags2 = decode_pair(buf + 23);
/* If not in RPM mode, ignore packet. */
if (!(flags2 & FLAGS2_RPM_MASK)) {
sr_dbg("Not in RPM mode. Count mode is unsupported.");
return SR_ERR_NA;
if (flags2 & FLAGS2_RPM_MASK) {
analog->mq = SR_MQ_FREQUENCY;
analog->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
} else if (flags2 & FLAGS2_COUNT_MASK) {
analog->mq = SR_MQ_COUNT;
analog->unit = SR_UNIT_UNITLESS;
}
if (flags1 & FLAGS1_HOLD_MASK)
@ -117,8 +131,5 @@ SR_PRIV int sr_ut372_parse(const uint8_t *buf, float *floatval,
*floatval = (float) value / divisor;
analog->mq = SR_MQ_FREQUENCY;
analog->unit = SR_UNIT_REVOLUTIONS_PER_MINUTE;
return SR_OK;
}