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Stellaris USB CDC on C6748

Dani Vain
Intellectual 385 points

Hi,

I am using the USB CDC class from the Stellaris library (revision 6288 ) on C6748.

I am using the "usb_dev_serial_c674x_c6748_evmC6748" example without the UART side (I want to communicate with PC only, no actual RS232 or UART) and from the functional aspect everything is OK, I can send/receive buffers from/to PC/device.

I have an issue with the bit rate which is very slow:  I am sending the 150 K[Byte] in about  1.1 [sec] .

I understood that events: USBD_CDC_EVENT_GET_LINE_CODING and USBD_CDC_EVENT_SET_LINE_CODING have nothing to do with the real USB bit rate (maybe I am wrong, I used thous and had no improvements or affect what so ever).

  1. How can I increase the bit rate to high/full USB bit rates?
  2. What maximum bit rate can I expect from this USB library class?
Thanks
Dani