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Add SETUP_EP0_OUT_BUF(), to be used for OUT control transfers. #18

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Add SETUP_EP0_OUT_BUF(), to be used for OUT control transfers. #18

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15 changes: 13 additions & 2 deletions firmware/library/include/fx2usb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -53,8 +53,12 @@ void usb_init(bool disconnect);
} while(0)

/**
* Configure EP0 for an IN or OUT transfer from or to `EP0BUF`.
* For an OUT transfer, specify `length` as `0`.
* Configure EP0 for an IN transfer from `EP0BUF`.
*
* Using this for an OUT transfer is deprecated, because it exposes a
* race condition. For OUT transfers please use one or more calls to
* `SETUP_EP0_OUT_BUF()` instead followed by a single call to `ACK_EP0()`.
* Do not call `ACK_EP0()` before processing all pending data in `EP0BUF`
*/
#define SETUP_EP0_BUF(length) \
do { \
Expand All @@ -64,6 +68,13 @@ void usb_init(bool disconnect);
EP0CS = _HSNAK; \
} while(0)

#define SETUP_EP0_OUT_BUF() \
do { \
SUDPTRCTL = _SDPAUTO; \
EP0BCH = 0; \
EP0BCL = 0; \
} while(0)

/**
* Acknowledge an EP0 SETUP or OUT transfer.
*/
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