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update dual mouse example to support 8 byte data packets #5

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Merged
merged 2 commits into from
Apr 3, 2025
Merged

update dual mouse example to support 8 byte data packets #5

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b18147f
update dual mouse example to support 8 byte data packets
FoamyGuy Apr 3, 2025
fea74c6
refactor get_mouse_deltas() to accept buffer and read_count instead o…
FoamyGuy Apr 3, 2025
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21 changes: 17 additions & 4 deletions examples/usb_host_descriptors_two_boot_mice.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,10 +78,23 @@
BUTTONS = ["left", "right", "middle"]

mouse_bufs = []

for mouse_tg in mouse_tgs:
# Buffer to hold data read from the mouse
# Boot mice have 4 byte reports
mouse_bufs.append(array.array("b", [0] * 4))
mouse_bufs.append(array.array("b", [0] * 8))


def get_mouse_deltas(buffer, read_count):
if read_count == 4:
delta_x = buffer[1]
delta_y = buffer[2]
elif read_count == 8:
delta_x = buffer[2]
delta_y = buffer[4]
else:
raise ValueError(f"Unsupported mouse packet size: {read_count}, must be 4 or 8")
return delta_x, delta_y


while True:
Expand All @@ -92,12 +105,12 @@
)
except usb.core.USBTimeoutError:
continue

mouse_deltas = get_mouse_deltas(mouse_bufs[mouse_index], count)
mouse_tgs[mouse_index].x = max(
0, min(display.width - 1, mouse_tgs[mouse_index].x + mouse_bufs[mouse_index][1])
0, min(display.width - 1, mouse_tgs[mouse_index].x + mouse_deltas[0])
)
mouse_tgs[mouse_index].y = max(
0, min(display.height - 1, mouse_tgs[mouse_index].y + mouse_bufs[mouse_index][2])
0, min(display.height - 1, mouse_tgs[mouse_index].y + mouse_deltas[1])
)

out_str = f"{mouse_tgs[mouse_index].x},{mouse_tgs[mouse_index].y}"
Expand Down