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# 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()
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