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RTX custom class example

Derek Stevens

I'm looking for a USB device custom class example for the LPC17xx. There's plenty of examples for HID, CDC & memory, but nothing for custom classes.

I have added usbd_cls.c (usbd_cls_ep_req etc) and my own USBD_ConfigDescriptor to override the usb_lib.c definition.

It's not working, so I must be missing something else.

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    It was not too difficult.

    1. Override USBD_ConfigDescriptor to define your own interface and endpoints

    2. Create an endpoint task.
    eg __task void USBD_RTX_EndPoint2(void)

    3. Use USBD_ReadEP to retrieve packets
    eg U32 PacketSize = USBD_ReadEP(2, Packet);

    4. Use USBD_WriteEP to send packets.
    eg USBD_WriteEP(0x82, &Out, sizeof(Out));

    5. Ensure the USB clock is 48 MHz

    Now I wish to make a dual MSC & custom class interface...

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  • 0

    It was not too difficult.

    1. Override USBD_ConfigDescriptor to define your own interface and endpoints

    2. Create an endpoint task.
    eg __task void USBD_RTX_EndPoint2(void)

    3. Use USBD_ReadEP to retrieve packets
    eg U32 PacketSize = USBD_ReadEP(2, Packet);

    4. Use USBD_WriteEP to send packets.
    eg USBD_WriteEP(0x82, &Out, sizeof(Out));

    5. Ensure the USB clock is 48 MHz

    Now I wish to make a dual MSC & custom class interface...

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