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vcd: Output timestamp only once per change. 

Avoid writing a new timestamp for every changed signal if multiple
signals change state simultaneously.  Also, keep signal transitions
on the same line with their timestamp to make the output easier to
inspect in a text editor.  (VCD does not care whether newlines or
spaces are used to separate tokens.)
This commit is contained in:
Daniel Elstner 2014-01-30 21:57:49 +01:00
parent 563080a8d1
commit 2b6363b433
1 changed files with 21 additions and 5 deletions
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26
output/vcd.c
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@ -156,6 +156,7 @@ static int receive(struct sr_output *o, const struct sr_dev_inst *sdi,
unsigned int i;
int p, curbit, prevbit, index;
uint8_t *sample;
gboolean timestamp_written;
(void)sdi;
@ -182,22 +183,37 @@ static int receive(struct sr_output *o, const struct sr_dev_inst *sdi,
logic = packet->payload;
for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
sample = logic->data + i;
timestamp_written = FALSE;
for (p = 0; p < ctx->num_enabled_probes; p++) {
index = g_array_index(ctx->probeindices, int, p);
curbit = ((unsigned)sample[index / 8] >> (index % 8)) & 1;
prevbit = ((unsigned)ctx->prevsample[index / 8] >> (index % 8)) & 1;
curbit = ((unsigned)sample[index / 8]
>> (index % 8)) & 1;
prevbit = ((unsigned)ctx->prevsample[index / 8]
>> (index % 8)) & 1;
/* VCD only contains deltas/changes of signals. */
if (prevbit == curbit && ctx->samplecount > 0)
continue;
/* Output timestamp of subsequent signal changes. */
if (!timestamp_written)
g_string_append_printf(*out, "#%.0f",
(double)ctx->samplecount /
ctx->samplerate * ctx->period);
/* Output which signal changed to which value. */
g_string_append_printf(*out, "#%.0f\n%i%c\n",
(double)ctx->samplecount / ctx->samplerate * ctx->period,
curbit, (char)('!' + p));
g_string_append_c(*out, ' ');
g_string_append_c(*out, '0' + curbit);
g_string_append_c(*out, '!' + p);
timestamp_written = TRUE;
}
if (timestamp_written)
g_string_append_c(*out, '\n');
ctx->samplecount++;
memcpy(ctx->prevsample, sample, ctx->unitsize);
}