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fs9721: properly set encoding digits

This commit is contained in:
Aurelien Jacobs 2016-08-17 01:16:40 +02:00 committed by Uwe Hermann
parent 8cbf5627ba
commit 70e28e7802
1 changed files with 18 additions and 13 deletions
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31
src/dmm/fs9721.c
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@ -130,7 +130,7 @@ static gboolean flags_valid(const struct fs9721_info *info)
return TRUE;
}
static int parse_value(const uint8_t *buf, float *result)
static int parse_value(const uint8_t *buf, float *result, int *exponent)
{
int i, sign, intval = 0, digits[4];
uint8_t digit_bytes[4];
@ -179,15 +179,16 @@ static int parse_value(const uint8_t *buf, float *result)
/* Decimal point position. */
if ((buf[3] & (1 << 3)) != 0) {
floatval /= 1000;
*exponent = -3;
sr_spew("Decimal point after first digit.");
} else if ((buf[5] & (1 << 3)) != 0) {
floatval /= 100;
*exponent = -2;
sr_spew("Decimal point after second digit.");
} else if ((buf[7] & (1 << 3)) != 0) {
floatval /= 10;
*exponent = -1;
sr_spew("Decimal point after third digit.");
} else {
*exponent = 0;
sr_spew("No decimal point in the number.");
}
@ -244,19 +245,20 @@ static void parse_flags(const uint8_t *buf, struct fs9721_info *info)
}
static void handle_flags(struct sr_datafeed_analog *analog, float *floatval,
const struct fs9721_info *info)
int *exponent, const struct fs9721_info *info)
{
/* Factors */
if (info->is_nano)
*floatval /= 1000000000;
*exponent -= 9;
if (info->is_micro)
*floatval /= 1000000;
*exponent -= 6;
if (info->is_milli)
*floatval /= 1000;
*exponent -= 3;
if (info->is_kilo)
*floatval *= 1000;
*exponent += 3;
if (info->is_mega)
*floatval *= 1000000;
*exponent += 6;
*floatval *= powf(10, *exponent);
/* Measurement modes */
if (info->is_volt) {
@ -349,18 +351,21 @@ SR_PRIV gboolean sr_fs9721_packet_valid(const uint8_t *buf)
SR_PRIV int sr_fs9721_parse(const uint8_t *buf, float *floatval,
struct sr_datafeed_analog *analog, void *info)
{
int ret;
int ret, exponent = 0;
struct fs9721_info *info_local;
info_local = (struct fs9721_info *)info;
if ((ret = parse_value(buf, floatval)) != SR_OK) {
if ((ret = parse_value(buf, floatval, &exponent)) != SR_OK) {
sr_dbg("Error parsing value: %d.", ret);
return ret;
}
parse_flags(buf, info_local);
handle_flags(analog, floatval, info_local);
handle_flags(analog, floatval, &exponent, info_local);
analog->encoding->digits = -exponent;
analog->spec->spec_digits = -exponent;
return SR_OK;
}