In some cases, this is required to avoid eventually getting a
USBD_STATUS_BAD_START_FRAME error back from the Windows USB stack.
This makes the libusbK code match the behaviour of the Linux backend.
It appears that the libusbK backend tried to get this behaviour by
setting StartFrame to 0. However, libusbK docs state that:
"Specifing 0 for KISO_CONTEXT::StartFrame (start transfer ASAP) is
restricted to the first transaction on a newly opened or reset pipe."
Closes #569
Signed-off-by: Nathan Hjelm <hjelmn@me.com>
if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
AUTO_CLEAR_STALL, sizeof(UCHAR), &policy))
usbi_dbg("failed to enable AUTO_CLEAR_STALL for endpoint %02X", endpoint_address);
+
+ if (sub_api == SUB_API_LIBUSBK) {
+ if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
+ ISO_ALWAYS_START_ASAP, sizeof(UCHAR), &policy))
+ usbi_dbg("failed to enable ISO_ALWAYS_START_ASAP for endpoint %02X", endpoint_address);
+ }
}
return LIBUSB_SUCCESS;
/* winusb.dll interface */
+/* pipe policies */
#define SHORT_PACKET_TERMINATE 0x01
#define AUTO_CLEAR_STALL 0x02
#define PIPE_TRANSFER_TIMEOUT 0x03
#define AUTO_FLUSH 0x06
#define RAW_IO 0x07
#define MAXIMUM_TRANSFER_SIZE 0x08
+/* libusbK */
+#define ISO_ALWAYS_START_ASAP 0x21
typedef enum _USBD_PIPE_TYPE {
UsbdPipeTypeControl,
-#define LIBUSB_NANO 11374
+#define LIBUSB_NANO 11375