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USB Communication in AT89C5131A

Hello,
I have been trying to perform USB communication between my AT89C5131A chip and pyUSB, to transmit some data to the microcontroller.
I haven't been able to find any library which will help me achieve this and as a result I've been trying to understand the USB configuration mentioned in http://www.keil.com/dd/docs/datashts/atmel/at89c5131_ds.pdf.

On running the command dev.set_configuration(), I receive an error and I suppose this indicates a mistake in my configuration till that point.

My hardware bootloader however successfully runs with the dfu-programmer.

I've set the clock frequency correctly and enabled USBEN and FEN as mentioned.

1. Where am I going wrong?
2. Are there any good libraries for doing USB communication with AT89C5131A?
3. Should I switch to an AVR uC instead and use the LUFA library?

Thank you!

Parents

0 Kalpesh Krishna over 9 years ago in reply to Chinzei Tsuneo

Hey Tsuneo,
I overcame the previous problem by using a PC having the full license. I successfully detected my device as a CDC device in pyusb.
However, I'm a bit unsure about step 2. I added something like this to my main()

while(1) {
   if ( uart_usb_tx_ready() && uart_usb_test_hit() ) {
      char c = uart_usb_getchar();
      uart_usb_putchar(c);
   }
}

Is this the correct place to write this code? On running this with pyusb, I get the following :- (131 is the endpoint address)

>>> dev.write(131, msg, 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 870, in write
    intf, ep = self._ctx.setup_request(self, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 190, in setup_request
    self.managed_claim_interface(device, intf)
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 146, in managed_claim_interface
    self.backend.claim_interface(self.handle, i)
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 747, in claim_interface
    _check(self.lib.libusb_claim_interface(dev_handle.handle, intf))
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 552, in _check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 16] Resource busy
>>>

Which is the correct place to put the code for step 2)? What are some good resources to learn the USB protocol from?

Thank you,
Kalpesh

Reply

0 Kalpesh Krishna over 9 years ago in reply to Chinzei Tsuneo

while(1) {
   if ( uart_usb_tx_ready() && uart_usb_test_hit() ) {
      char c = uart_usb_getchar();
      uart_usb_putchar(c);
   }
}

Is this the correct place to write this code? On running this with pyusb, I get the following :- (131 is the endpoint address)

>>> dev.write(131, msg, 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 870, in write
    intf, ep = self._ctx.setup_request(self, endpoint)
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 190, in setup_request
    self.managed_claim_interface(device, intf)
  File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 146, in managed_claim_interface
    self.backend.claim_interface(self.handle, i)
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 747, in claim_interface
    _check(self.lib.libusb_claim_interface(dev_handle.handle, intf))
  File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb1.py", line 552, in _check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 16] Resource busy
>>>

Which is the correct place to put the code for step 2)? What are some good resources to learn the USB protocol from?

Thank you,
Kalpesh

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