fs9721: properly set encoding digits

diff --git a/src/dmm/fs9721.c b/src/dmm/fs9721.c
index eaf5b477518de3f0fc10dd02623620556f639f25..d4a857d367d75b7c59d63967175a06c93b6aee3f 100644 (file)
--- a/src/dmm/fs9721.c
+++ b/src/dmm/fs9721.c
@@ -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;
 }