Fixed bug #406.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5638 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 4 insertions, 3 deletions

diff --git a/os/hal/src/usb.c b/os/hal/src/usb.c
index 9c3825910..745b2d436 100644
--- a/os/hal/src/usb.c
+++ b/os/hal/src/usb.c
@@ -693,15 +693,16 @@ void _usb_ep0in(USBDriver *usbp, usbep_t ep) {
     /* If the transmitted size is less than the requested size and it is a

        multiple of the maximum packet size then a zero size packet must be

        transmitted.*/

-    if ((usbp->ep0n < max) &&

-        ((usbp->ep0n % usbp->epc[0]->in_maxsize) == 0)) {

+    if ((usbp->ep0n < max) && ((usbp->ep0n % usbp->epc[0]->in_maxsize) == 0)) {

       usbPrepareTransmit(usbp, 0, NULL, 0);

       chSysLockFromIsr();

       usbStartTransmitI(usbp, 0);

       chSysUnlockFromIsr();

+      usbp->ep0state = USB_EP0_WAITING_TX0;

       return;

     }

-

+    /* Falls into, it is intentional.*/

+  case USB_EP0_WAITING_TX0:

     /* Transmit phase over, receiving the zero sized status packet.*/

     usbp->ep0state = USB_EP0_WAITING_STS;

     usbPrepareReceive(usbp, 0, NULL, 0);