X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=output%2Foutput_vcd.c;h=34b150d48ad47bcb6a026f7612d18f9be74080b4;hb=aa0b6b208e2ecaa7e56b020c204b6c3e702fb4ca;hp=1acf4a7b10fa70cce67673e73e0b3f8348630769;hpb=5cca9adbf27252349729cdb1e1c6ca0a526561b1;p=libsigrok.git

diff --git a/output/output_vcd.c b/output/output_vcd.c
index 1acf4a7b..34b150d4 100644
--- a/output/output_vcd.c
+++ b/output/output_vcd.c
@@ -61,12 +61,15 @@ static int init(struct output *o)
 
 	if (!(ctx = calloc(1, sizeof(struct context))))
 		return SIGROK_ERR_MALLOC;
+
 	o->internal = ctx;
 	ctx->num_enabled_probes = 0;
+
 	for (l = o->device->probes; l; l = l->next) {
 		probe = l->data;
-		if (probe->enabled)
-			ctx->probelist[ctx->num_enabled_probes++] = probe->name;
+		if (!probe->enabled)
+			continue;
+		ctx->probelist[ctx->num_enabled_probes++] = probe->name;
 	}
 
 	ctx->probelist[ctx->num_enabled_probes] = 0;
@@ -132,7 +135,9 @@ static int event(struct output *o, int event_type, char **data_out,
 	ctx = o->internal;
 	switch (event_type) {
 	case DF_TRIGGER:
-		/* TODO */
+		/* TODO: can a trigger mark be in a VCD file? */
+		*data_out = NULL;
+		*length_out = 0;
 		break;
 	case DF_END:
 		outlen = strlen("$dumpoff\n$end\n");
@@ -146,6 +151,10 @@ static int event(struct output *o, int event_type, char **data_out,
 		free(o->internal);
 		o->internal = NULL;
 		break;
+	default:
+		*data_out = NULL;
+		*length_out = 0;
+		break;
 	}
 
 	return SIGROK_OK;
@@ -158,6 +167,7 @@ static int data(struct output *o, char *data_in, uint64_t length_in,
 	unsigned int i, outsize;
 	int p, curbit, prevbit;
 	uint64_t sample, prevsample;
+	static uint64_t samplecount = 0;
 	char *outbuf, *c;
 
 	ctx = o->internal;
@@ -180,26 +190,25 @@ static int data(struct output *o, char *data_in, uint64_t length_in,
 	/* TODO: Are disabled probes handled correctly? */
 
 	for (i = 0; i <= length_in - ctx->unitsize; i += ctx->unitsize) {
+		samplecount++;
 		memcpy(&sample, data_in + i, ctx->unitsize);
+		if (i == 0)
+			prevsample = sample;
+		else
+			memcpy(&prevsample, data_in + i - 1, ctx->unitsize);
+
 		for (p = 0; p < ctx->num_enabled_probes; p++) {
-			curbit = (sample & ((uint64_t) (1 << p))) != 0;
-			if (i == 0) {
-				prevbit = ~curbit;
-			} else {
-				memcpy(&prevsample, data_in + i - 1,
-				       ctx->unitsize);
-				prevbit =
-				    (prevsample & ((uint64_t) (1 << p))) != 0;
-			}
-
-			/* VCD only contains deltas/changes. */
+			curbit = (sample & ((uint64_t) (1 << p))) >> p;
+			prevbit = (prevsample & ((uint64_t) (1 << p))) >> p;
+
+			/* VCD only contains deltas/changes of signals. */
 			if (prevbit == curbit)
 				continue;
 
-			/* FIXME: Only once per sample? */
-			/* TODO: Is 'i' correct here? */
+			/* Output which signal changed to which value. */
 			c = outbuf + strlen(outbuf);
-			sprintf(c, "#%i\n%i%c\n", i, curbit, (char)('!' + p));
+			sprintf(c, "#%" PRIu64 "\n%i%c\n", samplecount,
+				curbit, (char)('!' + p));
 		}
 
 		/* TODO: Use realloc() if strlen(outbuf) is almost "full"... */
@@ -214,6 +223,7 @@ static int data(struct output *o, char *data_in, uint64_t length_in,
 struct output_format output_vcd = {
 	"vcd",
 	"Value Change Dump (VCD)",
+	DF_LOGIC,
 	init,
 	data,
 	event,