rigol-ds: Fix memory buffer readout on DS4000 series.

[libsigrok.git] / src / hardware / rigol-ds / protocol.c

diff --git a/src/hardware/rigol-ds/protocol.c b/src/hardware/rigol-ds/protocol.c
index a533f12a1f12451d8acd609ccd407ab8bb0f9cf3..26b492053b653a72a92d2dd3866a6db81e5405e7 100644 (file)
--- a/src/hardware/rigol-ds/protocol.c
+++ b/src/hardware/rigol-ds/protocol.c
@@ -333,6 +333,7 @@ SR_PRIV int rigol_ds_capture_start(const struct sr_dev_inst *sdi)
        struct dev_context *devc;
        gchar *trig_mode;
        unsigned int num_channels, i, j;
+       int buffer_samples;
 
        if (!(devc = sdi->priv))
                return SR_ERR;
@@ -398,12 +399,29 @@ SR_PRIV int rigol_ds_capture_start(const struct sr_dev_inst *sdi)
                                        }
                                }
 
-                               devc->analog_frame_size = devc->digital_frame_size =
-                                       num_channels == 1 ?
-                                               devc->model->series->buffer_samples :
-                                                       num_channels == 2 ?
-                                                               devc->model->series->buffer_samples / 2 :
-                                                               devc->model->series->buffer_samples / 4;
+                               buffer_samples = devc->model->series->buffer_samples;
+                               if (buffer_samples == 0)
+                               {
+                                       /* The DS4000 series does not have a fixed memory depth, it
+                                        * can be chosen from the menu and also varies with number
+                                        * of active channels. Retrieve the actual number with the
+                                        * ACQ:MDEP command. */
+                                       sr_scpi_get_int(sdi->conn, "ACQ:MDEP?", &buffer_samples);
+                                       devc->analog_frame_size = devc->digital_frame_size =
+                                                       buffer_samples;
+                               }
+                               else
+                               {
+                                       /* The DS1000Z series has a fixed memory depth which we
+                                        * need to divide correctly according to the number of
+                                        * active channels. */
+                                       devc->analog_frame_size = devc->digital_frame_size =
+                                               num_channels == 1 ?
+                                                       buffer_samples :
+                                                               num_channels == 2 ?
+                                                                       buffer_samples / 2 :
+                                                                       buffer_samples / 4;
+                               }
                        }
 
                        if (rigol_ds_config_set(sdi, ":SING") != SR_OK)