kingst-la2016: balance frame begin and frame end emission

[libsigrok.git] / src / hardware / kingst-la2016 / protocol.c

diff --git a/src/hardware/kingst-la2016/protocol.c b/src/hardware/kingst-la2016/protocol.c
index 4f11b7d8532ddcd1de0294a24d13dbe6d896c532..de5e1ac747eeba6927a4afe08e41f60f79043bfc 100644 (file)
--- a/src/hardware/kingst-la2016/protocol.c
+++ b/src/hardware/kingst-la2016/protocol.c
@@ -1203,6 +1203,7 @@ SR_PRIV int la2016_receive_data(int fd, int revents, void *cb_data)
 
                /* Initiate the download of acquired sample data. */
                std_session_send_df_frame_begin(sdi);
+               devc->frame_begin_sent = TRUE;
                ret = la2016_start_download(sdi, receive_transfer);
                if (ret != SR_OK) {
                        sr_err("Cannot start acquisition data download.");
@@ -1228,7 +1229,10 @@ SR_PRIV int la2016_receive_data(int fd, int revents, void *cb_data)
                feed_queue_logic_flush(devc->feed_queue);
                feed_queue_logic_free(devc->feed_queue);
                devc->feed_queue = NULL;
-               std_session_send_df_frame_end(sdi);
+               if (devc->frame_begin_sent) {
+                       std_session_send_df_frame_end(sdi);
+                       devc->frame_begin_sent = FALSE;
+               }
                std_session_send_df_end(sdi);
 
                sr_dbg("Download finished, done post processing.");