add python testbench demo

Signed-off-by: Gwenn Le Bihan <[email protected]>

Author: gwennlbh

demos/demo_testbench.py

@@ -0,0 +1,35 @@
+import numpy as np
+
+np.set_printoptions(suppress=True, precision=2)
+
+import libodri_control_interface_pywrap as oci
+
+robot = oci.robot_from_yaml_file("config_testbench.yaml")
+
+des_pos = np.array([np.pi / 2, -np.pi / 2])
+
+robot.initialize(des_pos)
+
+kp, kd = 0.125, 0.0025
+c = 0
+while not robot.is_timeout:
+    robot.parse_sensor_data()
+
+    positions = robot.joints.positions
+    velocities = robot.joints.velocities
+
+    # Compute the PD control on the zero position.
+    torques = kp * (des_pos - positions) - kd * velocities
+
+    robot.joints.set_torques(torques)
+    robot.send_command_and_wait_end_of_cycle(0.001)
+
+    c += 1
+
+    if c % 1000 == 0:
+        print("joint pos:   ", positions)
+        print("joint vel:   ", velocities)
+        print("torques:     ", torques)
+        robot.robot_interface.PrintStats()
+
+print("timeout detected")