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From: Robert Nilsson <robert@nilssonstudios.com>
Date: Fri, 21 Jul 2006 23:52:04 -0500
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Subject: [PATCH] libusb usb_clear_halt implementation
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In order to get a device working correctly after a program restart I  
had to use this function.  It's a pretty simple change.

--- libusb-0.1.12/bsd.c Fri Mar  3 20:52:46 2006
+++ libusb-0.1.12.rob/bsd.c     Fri Jul 21 22:47:55 2006
@@ -623,9 +623,21 @@
int usb_clear_halt(usb_dev_handle *dev, unsigned int ep)
{
-  /* Not yet done, because I haven't needed it. */
+  int ret;
+  struct usb_ctl_request ctl_req;
-  USB_ERROR_STR(-ENOSYS, "usb_clear_halt called, unimplemented on  
BSD");
+  ctl_req.ucr_addr = 0; // Not used for this type of request
+  ctl_req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
+  ctl_req.ucr_request.bRequest = UR_CLEAR_FEATURE;
+  USETW(ctl_req.ucr_request.wValue, UF_ENDPOINT_HALT);
+  USETW(ctl_req.ucr_request.wIndex, ep);
+  USETW(ctl_req.ucr_request.wLength, 0);
+  ctl_req.ucr_flags = 0;
+
+  if ((ret = ioctl(dev->fd, USB_DO_REQUEST, &ctl_req)) < 0)
+      USB_ERROR_STR(-errno, "clear_halt:  failed for %d", ep);
+
+       return ret;
}
int usb_reset(usb_dev_handle *dev)


Rob.