analog: improve output readability by using SI prefix

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

diff --git a/src/output/analog.c b/src/output/analog.c
index 5f77a59c2c3393c1160ea610a116e893f50cf512..5e2b7cd527b6ce0c60c7b1f3bafbb44e60d862ed 100644 (file)
--- a/src/output/analog.c
+++ b/src/output/analog.c
@@ -116,13 +116,15 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
                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);
                                ch = l->data;
                                g_string_append_printf(*out, "%s: ", ch->name);
-                               number = g_strdup_printf("%.*f", MAX(digits, 0),
-                                               fdata[i * num_channels + c]);
+                               number = g_strdup_printf("%.*f", MAX(digits, 0), value);
                                g_string_append(*out, number);
                                g_free(number);
                                g_string_append(*out, " ");
+                               g_string_append(*out, prefix);
                                g_string_append(*out, suffix);
                                g_string_append(*out, "\n");
                        }