From: Soeren Apel <redacted>
Date: Sun, 1 Oct 2017 22:25:57 +0000 (+0200)
Subject: Demo: Implement multi-frame development feature
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=f55bea7626d8bfa3a3d0bbff1e9f6ac98a6aadc5;p=libsigrok.git

Demo: Implement multi-frame development feature
---

diff --git a/src/hardware/demo/api.c b/src/hardware/demo/api.c
index 5c1543cb..f23cb700 100644
--- a/src/hardware/demo/api.c
+++ b/src/hardware/demo/api.c
@@ -453,6 +453,9 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 
 	std_session_send_df_header(sdi);
 
+	if (SAMPLES_PER_FRAME > 0)
+		std_session_send_frame_begin(sdi);
+
 	/* We use this timestamp to decide how many more samples to send. */
 	devc->start_us = g_get_monotonic_time();
 	devc->spent_us = 0;
@@ -464,6 +467,10 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 {
 	sr_session_source_remove(sdi->session, -1);
+
+	if (SAMPLES_PER_FRAME > 0)
+		std_session_send_frame_end(sdi);
+
 	std_session_send_df_end(sdi);
 
 	return SR_OK;
diff --git a/src/hardware/demo/protocol.c b/src/hardware/demo/protocol.c
index 9969abf9..37417f73 100644
--- a/src/hardware/demo/protocol.c
+++ b/src/hardware/demo/protocol.c
@@ -459,12 +459,17 @@ SR_PRIV int demo_prepare_data(int fd, int revents, void *cb_data)
 	/* How many samples are outstanding since the last round? */
 	samples_todo = (todo_us * devc->cur_samplerate + G_USEC_PER_SEC - 1)
 			/ G_USEC_PER_SEC;
+
+	if (SAMPLES_PER_FRAME > 0)
+		samples_todo = SAMPLES_PER_FRAME;
+
 	if (devc->limit_samples > 0) {
 		if (devc->limit_samples < devc->sent_samples)
 			samples_todo = 0;
 		else if (devc->limit_samples - devc->sent_samples < samples_todo)
 			samples_todo = devc->limit_samples - devc->sent_samples;
 	}
+
 	/* Calculate the actual time covered by this run back from the sample
 	 * count, rounded towards zero. This avoids getting stuck on a too-low
 	 * time delta with no samples being sent due to round-off.
@@ -534,6 +539,11 @@ SR_PRIV int demo_prepare_data(int fd, int revents, void *cb_data)
 		}
 		sr_dbg("Requested number of samples reached.");
 		sr_dev_acquisition_stop(sdi);
+	} else {
+		if (SAMPLES_PER_FRAME > 0) {
+			std_session_send_frame_end(sdi);
+			std_session_send_frame_begin(sdi);
+		}
 	}
 
 	return G_SOURCE_CONTINUE;
diff --git a/src/hardware/demo/protocol.h b/src/hardware/demo/protocol.h
index 0b13ebfb..53ad043b 100644
--- a/src/hardware/demo/protocol.h
+++ b/src/hardware/demo/protocol.h
@@ -33,6 +33,8 @@
 #define LOGIC_BUFSIZE			4096
 /* Size of the analog pattern space per channel. */
 #define ANALOG_BUFSIZE			4096
+/* This is a development feature: it starts a new frame every n samples. */
+#define SAMPLES_PER_FRAME		0
 
 struct dev_context {
 	uint64_t cur_samplerate;