8-bit MicrocontrollersのトピックGeneric HID with HCS08JM

Generic HID with HCS08JM

ETCTim — Fri, 06 Feb 2009 06:15:46 GMT

I am trying to use the USB with Generic HID to move some data from my development board to my PC.

I successfully have the Freescale demo board running and delivering 1 byte of data based on the 2 switches on the eval board.

My problem is that I cannot figure out how to increase the 1 byte to multiple bytes. I tried changing a few of the values, such as the 1 in the following code:

out_report=hid_add_report(rpt_out, 0, 1);

in_report=hid_add_report(rpt_in, 0, 1);

As well as the constant EP0_PACKET_SIZE (which is 8 by default.)

Any changes I have tried have caused the board to run off into the weeds when I try to USB send.

I would appreciate if someone can help me out.

Which values should I modify?

Do I need to modify my descriptor?

Ultimately, I would like to send a payload of 64 bytes.

Thanks in advanced.

Tim

Re: Generic HID with HCS08JM

Goz — Mon, 09 Feb 2009 18:34:16 GMT

Hi Tim,

You are almost there. I am assuming you are having problems sending back data larger than just a few bytes. If so, you will also have to change your endpoint descriptor in the hid_usb_config.c file. Modify USB_FILL_EP_DEC to something like the following USB_FILL_EP_DESC(0x1, 1, 3, 64, 4). Where 64 indicates that you want to be able to send 64 bytes max back to the host.

Along with what you have changed already, this should just work.

Goz

Re: Generic HID with HCS08JM

TurboBob — Tue, 10 Feb 2009 01:57:56 GMT

don't forget MaxReportLength in HID.c this sets the array sizes when setting up reports.