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usb: Add usb_endpoint_append_td

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This implements the procedure for adding a TD to the end of an active
queue described in UM10503 Section 23.10.11.3.
This commit is contained in:
Ben Gamari
2013-06-28 21:30:46 -04:00
parent 2717b7534e
commit 6b05089700
2 changed files with 39 additions and 0 deletions
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33
firmware/hackrf_usb/usb.c
View File

@ -195,6 +195,39 @@ void usb_endpoint_prime(
USB0_ENDPTPRIME = USB0_ENDPTPRIME_PERB(1 << endpoint_number);
}
}
// Schedule an already filled-up transfer descriptor for execution on
// the given endpoint. Note that this requires that one knows the tail
// of the endpoint's TD queue
void usb_endpoint_append_td(
const usb_endpoint_t* const endpoint,
usb_transfer_descriptor_t* const tail_td,
usb_transfer_descriptor_t* const new_td
) {
const uint_fast8_t endpoint_number = usb_endpoint_number(endpoint->address);
bool done;
tail_td->next_dtd_pointer = new_td;
do {
if( usb_endpoint_is_in(endpoint->address) ) {
if (USB0_ENDPTPRIME & USB0_ENDPTPRIME_PETB(1 << endpoint_number) )
return;
} else {
if (USB0_ENDPTPRIME & USB0_ENDPTPRIME_PERB(1 << endpoint_number) )
return;
}
USB0_USBCMD_D |= USB0_USBCMD_D_ATDTW;
done = usb_endpoint_is_ready(endpoint);
} while (!(USB0_USBCMD_D & USB0_USBCMD_D_ATDTW));
USB0_USBCMD_D &= ~USB0_USBCMD_D_ATDTW;
if(!done) {
usb_endpoint_prime(endpoint, new_td);
}
}
/*
static bool usb_endpoint_is_priming(
const usb_endpoint_t* const endpoint

6
firmware/hackrf_usb/usb.h
View File

@ -92,4 +92,10 @@ void usb_endpoint_prime(
usb_transfer_descriptor_t* const first_td
);
void usb_endpoint_append_td(
const usb_endpoint_t* const endpoint,
usb_transfer_descriptor_t* const tail_td,
usb_transfer_descriptor_t* const new_td
);
#endif//__USB_H__