Fix scaling

Signed-off-by: Travis F. Collins <[email protected]>

adi/jesd_internal.py

@@ -78,11 +78,11 @@ def get_all_statuses(self):
 
 
 class jesd_eye_scan(jesd):
-    _jesd_es_duration_ms = 100
+    _jesd_es_duration_ms = 10
     _jesd_prbs = 7
     _max_possible_lanes_index = 24
 
-    _half_rate = {"mode": "Half Fate", "scale": 0.004}
+    _half_rate = {"mode": "Half Rate", "scale": 1}
     _quarter_rate = {"mode": "Quarter Rate", "scale": 4}
 
     lanes = {}
@@ -173,8 +173,19 @@ def get_eye_data(self, device=None, lanes=None):
             if lane not in available_lanes:
                 raise Exception(f"Lane {lane} not found for device {device}.")
 
+        # Enable PRBS on TX side
+        devices_root = "/sys/bus/platform/devices/"
+        dev_list = self.fs.listdir(devices_root)
+        tx_dev = next((dev for dev in dev_list if "adxcvr-tx" in dev), None)
+        if not tx_dev:
+            raise Exception("No adxcvr-tx device found. Cannot enable PRBS.")
+
+        self.fs.echo_to_fd("7", f"{devices_root}/{tx_dev}/prbs_select")
+
         lane_eye_data = {}
 
+        print("Hold tight while we get the eye data...")
+
         for lane in lanes:
             # Configure BIST
             print(f"Getting eye data for lane {lane}")
@@ -205,14 +216,15 @@ def get_eye_data(self, device=None, lanes=None):
                 else:
                     spo = [float(x) for x in eye_line.split(",")]
                     x.append(spo[0])
-                    y1.append(spo[1] * scale / 1000)
-                    y2.append(spo[2] * scale / 1000)
+                    y1.append(spo[1] * scale)
+                    y2.append(spo[2] * scale)
 
             if len(x) == 0:
                 raise Exception(f"No eye data found for lane {lane}.")
 
             graph_helpers = {
                 "xlim": [-info[1] / 2, info[1] / 2 - 1],
+                "ylim": [-256, 256],
                 "xlabel": "SPO",
                 "ylabel": "EYE Voltage (mV)",
                 "title": "JESD204 2D Eye Scan",

adi/sshfs.py

@@ -51,3 +51,8 @@ def listdir(self, path):
     def gettext(self, path, *kargs, **kwargs):
         stdout, _ = self._run(f"cat {path}")
         return stdout
+
+    def echo_to_fd(self, data, path):
+        if not self.isfile(path):
+            raise FileNotFoundError(f"No such file: {path}")
+        self._run(f"echo '{data}' > {path}")

examples/ad9081_jesd_eye_diagram.py

@@ -16,13 +16,13 @@
 eye_data_per_lane = dev._jesd.get_eye_data()
 num_lanes = len(eye_data_per_lane.keys())
 
-for lane in eye_data_per_lane:
+for i, lane in enumerate(eye_data_per_lane):
 
     x = eye_data_per_lane[lane]["x"]
     y1 = eye_data_per_lane[lane]["y1"]
     y2 = eye_data_per_lane[lane]["y2"]
 
-    plt.subplot(int(num_lanes / 2), 2, int(lane) + 1)
+    plt.subplot(int(num_lanes / 2), 2, int(i) + 1)
     plt.scatter(x, y1, marker="+", color="blue")
     plt.scatter(x, y2, marker="+", color="red")
     plt.xlim(eye_data_per_lane[lane]["graph_helpers"]["xlim"])
@@ -36,5 +36,6 @@
     )
     plt.axvline(0, color="black")  # vertical
     plt.axhline(0, color="black")  # horizontal
+    plt.grid(True)
 
 plt.show()