topic Re: USB Generic HIC -CMX Stack in 8-bit Microcontrollers

USB Generic HIC -CMX Stack

S_B_D — Tue, 08 Dec 2009 06:12:37 GMT

Hi,

I am reading how to patch CMXs generic HID demo to send and receive 64 byte payload packets.

Can someone post an explanation on how to modify the project to do this? Also, how to send the data and how to read the incoming PC data.

Your kind help is appreciated.

S.B.D

Re: USB Generic HIC -CMX Stack

S_B_D — Sun, 13 Dec 2009 20:30:53 GMT

No success yet...

Was anyone able to patch this project for Transmit/Receive 64 byte packets?

Thanks,

S.B.D

Re: USB Generic HIC -CMX Stack

donw — Mon, 14 Dec 2009 09:57:51 GMT

I have USB HID CMX code working with 64 byte packets:

change the '8' to '64' as below:

geh_config_descriptor: ;

FCB 09,02,$25,00
FCB 01,01,04,$40,00,03,09,00

   FCB 09,04,00,00,01
   FCB 03,00,00                     ;HID,0,0
   FCB 05
   FCB 09,$21,00,01,00,01,$22              ;DESCRIPTOR+21 HID DESCRIPTOR
   FCB $23,00                             ;size of geh_report_descriptor
   FCB 07,05,$81,03,64t,00,01   ;8 -> 64 bytes block size

also the USB_Report_Out size must be 64

I don't think anything else needed changing, but do a search on this forum for HID. others have posted interesting stuff also.

don

Re: USB Generic HIC -CMX Stack

S_B_D — Thu, 17 Dec 2009 17:41:31 GMT

Thanks for all the tips.

The problem was with the descriptor bitmap.

Here is the current bitmap:

const hcc_u8 geh_report_descriptor[] = {
    0x06, 0x00, 0xff,              // USAGE_PAGE (Vendor Defined Page 1)
    0x09, 0x01,                    // USAGE (Vendor Usage 1)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x05, 0x08,                    //   USAGE_PAGE (LEDs)
    0x09, 0x4b,                    //   USAGE (Generic Indicator)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x25, 0x0f,                    //   LOGICAL_MAXIMUM (1)
    0x75, 0x08,                    //   REPORT_SIZE (1)
    0x95, 0x40,                    //   REPORT_COUNT (4)
    0x91, 0x02,                    //   OUTPUT (Data,Var,Abs)
    0x75, 0x00,                    //   REPORT_SIZE (1)
    0x95, 0x00,                    //   REPORT_COUNT (4)
    0x91, 0x03,                    //   OUTPUT (Cnst,Var,Abs)
    0x05, 0x09,                    //   USAGE_PAGE (Button)
    0x19, 0x01,                    //   USAGE_MINIMUM (Button 1)
    0x29, 0x02,                    //   USAGE_MAXIMUM (Button 2)
    0x75, 0x08,                    //   REPORT_SIZE (1)
    0x95, 0x40,                    //   REPORT_COUNT (2)
    0x81, 0x02,                    //   INPUT (Data,Var,Abs)
    0x75, 0x00,                    //   REPORT_SIZE (1)
    0x95, 0x00,                    //   REPORT_COUNT (6)
    0x81, 0x03,                    //   INPUT (Cnst,Var,Abs)
    0xc0                           //   END_COLLECTION
};

The report size is now 8 bits and the report count is 64.

I have 64 byte communication both upstream and downstream.

I still need to figure out why the upstream packets (JM to PC) sends the first byte as 0x00.

Does someone know how to fix this?

other than that everything looks stable.

I am currently able to get a 32kbyte/sec upstream data rate.

Will opening another endpoint enable me to reach the theoretical 64kbyte/sec?

S.B.D