On Friday 06 February 2009, Johan wrote: > I am investigating if it is possible to use the CDC composite gadget > driver available in linux 2.6.27 together with an Atmel AT91SAM9260. No; the current AT91 chips don't have enough endpoints. Ignoring ep0: CDC function 1 (e.g. Ethernet) - ep1, ep2 ... for bulk in/out - ep3 ... for interrupt/status CDC function 2 (e.g. ACM) - ep4, ep5 ... for bulk in/out - <MISSING> endpoint for interrupt/status > As I understand it needs a USB host port with at least 6 endpoints. Peripheral, not host. > When I read the datasheet for the processor it states that it haves > six endpoints in its usb device port, 2 control/bulk/interrupt and 4 > bulk/iso/interrupt. When I read about the at91 udc driver > USB_GADGET_AT91 in kernel configuration it states "Many Atmel AT91 > processors (such as the AT91RM2000) have a full speed USB Device Port > with support for five configurable endpoints (plus endpoint zero)." > > I have tried to load the USB composite driver and it fails with error > -19 ENODEV when it tries to allocates endpoints. > > So I wonder about the endpoint zero, can it be used in a gadget > driver? Or is it reserved for another purposes? Reserved; used all over the place, always available, and hence it doesn't fall into that "6 endpoints" count. - Dave > > /Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
