Recently, on kernel 7.x.x, I received a device not recognized pop-up on the dev desktop.
It caused some frustration. Since an update/upgrade, the BeagleY-AI has again started to be recognized.
The small things in life…
On with the source code. DoF!
Seth
#!/usr/bin/python3
# Where did this source code come from?
# I am still researching older notes and ideas...
import sys
import usb.core
import usb.util
# Constant definitions mimicking the C++ implementation
VENDOR_ID = 0x1FFB
PRODUCT_IDS = [0x0089, 0x008A, 0x008B, 0x008C]
REQUEST_SET_TARGET = 0x85 # The standard Pololu Maestro native USB request ID
def find_maestro_device():
"""Loops through known product IDs to find the Pololu Maestro device."""
for pid in PRODUCT_IDS:
device = usb.core.find(idVendor=VENDOR_ID, idProduct=pid)
if device is not None:
return device
return None
def set_target_zero(device, position, servo0):
"""Sends the target position to a specific servo channel using a control transfer."""
# bmRequestType = 0x40 (Vendor-defined request, host-to-device direction)
bm_request_type = 0x40
b_request = REQUEST_SET_TARGET
# Value parameter requires position in quarter-microseconds (input * 4)
w_value = int(position * 4)
w_index = int(servo0)
try:
# usb.core.Device.ctrl_transfer(bmRequestType, bRequest, wValue, wIndex, data_or_wLength, timeout)
device.ctrl_transfer(
bm_request_type, b_request, w_value, w_index, data_or_wLength=0, timeout=5000
)
except usb.core.USBError as e:
print(f"USB Transfer failed: {e}", file=sys.stderr)
def set_target_one(device, position, servo1):
"""Sends the target position to a specific servo channel using a control transfer."""
# bmRequestType = 0x40 (Vendor-defined request, host-to-device direction)
bm_request_type = 0x40
b_request = REQUEST_SET_TARGET
# Value parameter requires position in quarter-microseconds (input * 4)
w_value = int(position * 4)
w_index = int(servo1)
try:
# usb.core.Device.ctrl_transfer(bmRequestType, bRequest, wValue, wIndex, data_or_wLength, timeout)
device.ctrl_transfer(
bm_request_type, b_request, w_value, w_index, data_or_wLength=0, timeout=5000
)
except usb.core.USBError as e:
print(f"USB Transfer failed: {e}", file=sys.stderr)
def set_target_two(device, position, servo2):
"""Sends the target position to a specific servo channel using a control transfer."""
# bmRequestType = 0x40 (Vendor-defined request, host-to-device direction)
bm_request_type = 0x40
b_request = REQUEST_SET_TARGET
# Value parameter requires position in quarter-microseconds (input * 4)
w_value = int(position * 4)
w_index = int(servo2)
try:
# usb.core.Device.ctrl_transfer(bmRequestType, bRequest, wValue, wIndex, data_or_wLength, timeout)
device.ctrl_transfer(
bm_request_type, b_request, w_value, w_index, data_or_wLength=0, timeout=5000
)
except usb.core.USBError as e:
print(f"USB Transfer failed: {e}", file=sys.stderr)
servo0 = 0
servo1 = 1
servo2 = 2
def main():
print("Searching for Pololu Maestro device...")
device = find_maestro_device()
if device is None:
print("Error: Maestro device not found. Check physical connections or permissions.")
sys.exit(1)
print("Device found and initialized successfully.")
try:
while True:
user_input = input("Enter position (or 'q' to quit): ").strip()
if user_input.lower() == "q":
break
try:
position = int(user_input)
set_target_zero(device, position, 0)
set_target_zero(device, position, 1)
except ValueError:
print("Invalid input. Please enter an integer number.")
except KeyboardInterrupt:
print("\nExiting program.")
finally:
# PyUSB handles closing the device and recycling handles implicitly on exit,
# but clearing configurations ensures safe detachment.
usb.util.dispose_resources(device)
if __name__ == "__main__":
main()
Can someone please tell me why this code works when a positive value is given but then shuts the BeagleY-AI down when a negative value is given?
bm_request_type = 0x40 is most likely the error or bug in the source code.
That or it is used on multiple occasions on different functions.
Please send guidance on how to test for this shutting down of the beagley-ai.
position = int(user_input)
set_target_zero(device, position, 0)
set_target_zero(device, position, 1)
as you can tell, I was telling set_target_zero to control servo0 and servo1. oops.
Since I found this error and now have new source code, I am getting an exact shutdown when running integers on the bash shell.
I am no longer running negative integers which was a reason for the self-protect method from reset on the BeagleY-AI.
I cannot figure out what has happened so far. My wlan0 has since been removed by some force outside of myself. I currently do not know if the amperage hitting the USB port is over 2.8A but this would in fact be a discrepancy.
Now, could the wlan0 interface be self-removed via some code in the fs?
I am not sure.
device.ctrl_transfer() line is from pyusbSolved for now