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Fix Zero Lenght Packet problem on USB (Thanks to Phil)

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This commit is contained in:
Romuald Conty 2010-09-23 10:28:35 +00:00
parent 7e2ddedfc1
commit 868919107a
2 changed files with 8 additions and 0 deletions
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7
libnfc/drivers/pn53x_usb.c
View file

@ -65,10 +65,12 @@ get_end_points (struct usb_device *dev, usb_spec_t * pus)
// Test if we dealing with a bulk IN endpoint
if ((uiEndPoint & USB_ENDPOINT_DIR_MASK) == USB_ENDPOINT_IN) {
pus->uiEndPointIn = uiEndPoint;
pus->wMaxPacketSize = puid->endpoint[uiIndex].wMaxPacketSize;
}
// Test if we dealing with a bulk OUT endpoint
if ((uiEndPoint & USB_ENDPOINT_DIR_MASK) == USB_ENDPOINT_OUT) {
pus->uiEndPointOut = uiEndPoint;
pus->wMaxPacketSize = puid->endpoint[uiIndex].wMaxPacketSize;
}
}
}
@ -258,6 +260,11 @@ pn53x_usb_transceive (nfc_device_t * pnd, const byte_t * pbtTx, const size_t szT
#endif
ret = usb_bulk_write (pus->pudh, pus->uiEndPointOut, (char *) abtTx, szTxLen + 7, USB_TIMEOUT);
// XXX This little hack is a well know problem of libusb, see http://www.libusb.org/ticket/6 for more details
if ((ret % pus->wMaxPacketSize) == 0) {
usb_bulk_write (pus->pudh, pus->uiEndPointOut, "\0", 0, USB_TIMEOUT);
}
if (ret < 0) {
DBG ("usb_bulk_write failed with error %d", ret);
pnd->iLastError = DEIO;

1
libnfc/drivers/pn53x_usb.h
View file

@ -27,6 +27,7 @@ typedef struct {
usb_dev_handle *pudh;
uint32_t uiEndPointIn;
uint32_t uiEndPointOut;
uint32_t wMaxPacketSize;
} usb_spec_t;
typedef struct {