1 files changed, 63 insertions, 0 deletions
diff --git a/examples/device/uac2_speaker_fb/src/audio_debug.py b/examples/device/uac2_speaker_fb/src/audio_debug.py
new file mode 100644
index 000000000..182d6ca89
--- /dev/null
+++ b/examples/device/uac2_speaker_fb/src/audio_debug.py
@@ -0,0 +1,63 @@
+# Install python3 HID package https://pypi.org/project/hid/
+import hid
+from ctypes import *
+import matplotlib.pyplot as plt
+import matplotlib.animation as animation
+
+# Example must be compiled with CFG_AUDIO_DEBUG=1
+VID = 0xcafe
+PID = 0x4014
+
+CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_RX = 2
+
+class audio_debug_info_t (Structure):
+    _fields_ = [("sample_rate", c_uint32),
+                ("alt_settings", c_uint8),
+                ("mute", (CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_RX + 1) * c_int8),
+                ("volume", (CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_RX + 1) * c_int16),
+                ("fifo_size", c_uint16),
+                ("fifo_count", c_uint16),
+                ("fifo_count_avg", c_uint16)
+                ]
+
+dev = hid.Device(VID, PID)
+
+if dev:
+    # Create figure for plotting
+    fig = plt.figure()
+    ax = fig.add_subplot(1, 1, 1)
+    fifo_avg = []
+    fifo_cnt = []
+    # This function is called periodically from FuncAnimation
+    def animate(i):
+        info = None
+        for i in range(30):
+            str_in = dev.read(64, 10)
+            if str_in:
+                info = audio_debug_info_t.from_buffer_copy(str_in)
+
+                global fifo_avg
+                global fifo_cnt
+                fifo_avg.append(info.fifo_count_avg)
+                fifo_cnt.append(info.fifo_count)
+
+        # Limit to 1000 items
+        fifo_avg = fifo_avg[-1000:]
+        fifo_cnt = fifo_cnt[-1000:]
+
+        if info is not None:
+            # Draw x and y lists
+            ax.clear()
+            ax.plot(fifo_cnt, label='FIFO count')
+            ax.plot(fifo_avg, label='FIFO average')
+            ax.legend()
+            ax.set_ylim(bottom=0, top=info.fifo_size)
+
+            # Format plot
+            plt.title('FIFO information')
+            plt.grid()
+
+            print(f'Sample rate:{info.sample_rate} | Alt settings:{info.alt_settings} | Volume:{info.volume[:]}')
+
+    ani = animation.FuncAnimation(fig, animate, interval=10)
+    plt.show()