README.devices: Document how to make some DMMs log.

[libsigrok.git] / output / analog.c

diff --git a/output/analog.c b/output/analog.c
index d2f28b6b2853bf94d6bb2ad91eea4c750c688900..e7e475fc3126ec6219ddf509c76ae02d6e77f74b 100644 (file)
--- a/output/analog.c
+++ b/output/analog.c
@@ -1,5 +1,5 @@
 /*
- * This file is part of the sigrok project.
+ * This file is part of the libsigrok project.
  *
  * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
  *
@@ -36,7 +36,6 @@
 struct context {
        int num_enabled_probes;
        GPtrArray *probelist;
-       GString *out;
 };
 
 static int init(struct sr_output *o)
@@ -66,8 +65,6 @@ static int init(struct sr_output *o)
                ctx->num_enabled_probes++;
        }
 
-       ctx->out = g_string_sized_new(512);
-
        return SR_OK;
 }
 
@@ -188,45 +185,44 @@ static void fancyprint(int unit, int mqflags, float value, GString *out)
        g_string_append_c(out, '\n');
 }
 
-static GString *receive(struct sr_output *o, const struct sr_dev_inst *sdi,
-               const struct sr_datafeed_packet *packet)
+static int receive(struct sr_output *o, const struct sr_dev_inst *sdi,
+               const struct sr_datafeed_packet *packet, GString **out)
 {
        const struct sr_datafeed_analog *analog;
-       struct context *ctx;
+       struct sr_probe *probe;
+       GSList *l;
        const float *fdata;
-       int i, j;
+       int i, p;
 
        (void)sdi;
 
+       *out = NULL;
        if (!o || !o->sdi)
-               return NULL;
-       ctx = o->internal;
+               return SR_ERR_ARG;
 
-       g_string_set_size(ctx->out, 0);
        switch (packet->type) {
-       case SR_DF_HEADER:
-               break;
        case SR_DF_FRAME_BEGIN:
-               g_string_append_printf(ctx->out, "FRAME-BEGIN\n");
+               *out = g_string_new("FRAME-BEGIN\n");
                break;
        case SR_DF_FRAME_END:
-               g_string_append_printf(ctx->out, "FRAME-END\n");
+               *out = g_string_new("FRAME-END\n");
                break;
        case SR_DF_ANALOG:
                analog = packet->payload;
                fdata = (const float *)analog->data;
+               *out = g_string_sized_new(512);
                for (i = 0; i < analog->num_samples; i++) {
-                       for (j = 0; j < ctx->num_enabled_probes; j++) {
-                               g_string_append_printf(ctx->out, "%s: ",
-                                               (char *)g_ptr_array_index(ctx->probelist, j));
+                       for (l = analog->probes, p = 0; l; l = l->next, p++) {
+                               probe = l->data;
+                               g_string_append_printf(*out, "%s: ", probe->name);
                                fancyprint(analog->unit, analog->mqflags,
-                                               fdata[i + j], ctx->out);
+                                               fdata[i + p], *out);
                        }
                }
                break;
        }
 
-       return ctx->out;
+       return SR_OK;
 }
 
 static int cleanup(struct sr_output *o)
@@ -238,7 +234,6 @@ static int cleanup(struct sr_output *o)
        ctx = o->internal;
 
        g_ptr_array_free(ctx->probelist, 1);
-       g_string_free(ctx->out, 1);
        g_free(ctx);
        o->internal = NULL;
 
@@ -250,6 +245,6 @@ SR_PRIV struct sr_output_format output_analog = {
        .description = "Analog data",
        .df_type = SR_DF_ANALOG,
        .init = init,
-       .recv = receive,
+       .receive = receive,
        .cleanup = cleanup
 };