analog: use SI prefix only with units that accept SI prefixes

[libsigrok.git] / src / output / analog.c

diff --git a/src/output/analog.c b/src/output/analog.c
index 5e2b7cd527b6ce0c60c7b1f3bafbb44e60d862ed..9ff77da4b765cf7ae7d8ea4af9b42dd66b3fdf71 100644 (file)
--- a/src/output/analog.c
+++ b/src/output/analog.c
@@ -113,11 +113,14 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
                        /* TODO we don't know how to print by number of bits yet. */
                        digits = 6;
                }
+               gboolean si_friendly = sr_analog_si_prefix_friendly(analog->meaning->unit);
                sr_analog_unit_to_string(analog, &suffix);
                for (i = 0; i < analog->num_samples; i++) {
                        for (l = analog->meaning->channels, c = 0; l; l = l->next, c++) {
                                float value = fdata[i * num_channels + c];
-                               const char *prefix = sr_analog_si_prefix(&value, &digits);
+                               const char *prefix = "";
+                               if (si_friendly)
+                                       prefix = sr_analog_si_prefix(&value, &digits);
                                ch = l->data;
                                g_string_append_printf(*out, "%s: ", ch->name);
                                number = g_strdup_printf("%.*f", MAX(digits, 0), value);