USB HOST implementation on teensy 4.1 #6527
Description
I can't get data through endpoint of usb host implementation
Where is my mistake?
this is my code:
import usb_host
import usb.core
import sys
import board
import digitalio
import microcontroller
import time
import array
#INIT USB WITH POSITIVE AND NEGATIVE PINS
if hasattr(board, "USB_HOST_POWER"):
d = digitalio.DigitalInOut(board.USB_HOST_POWER)
d.switch_to_output(value=True)
print("USB power on")
h = usb_host.Port(board.USB_HOST_DP, board.USB_HOST_DM)
#FIND VMETER
vmeter = usb.core.find(idVendor=0x16d0, idProduct=0x0668)
print(vmeter.manufacturer, vmeter.product)
if vmeter.is_kernel_driver_active(0):
vmeter.detach_kernel_driver(0)
buf = array.array('b', [0] * 64)
while True:
try:
count = vmeter.read(0x82, buf)
# bEndpointAddress 0x82 IN Endpoint 2
# bEndpointAddress 0x01 OUT Endpoint 1
except usb.core.USBTimeoutError:
continue
print(buf)
print(count)
time.sleep(.01)
I'm getting right device manufacturer and product names,
but my "buf" is always empty and "count" of read bytes is always 14...
array("b", [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
14
I also tried 7 and 8 version of CircuitPython and different usb devices...