diff options
Diffstat (limited to 'os/hal/src/serial_usb.c')
| -rw-r--r-- | os/hal/src/serial_usb.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/os/hal/src/serial_usb.c b/os/hal/src/serial_usb.c index 23a323356..000d13951 100644 --- a/os/hal/src/serial_usb.c +++ b/os/hal/src/serial_usb.c @@ -323,8 +323,9 @@ void sduDataTransmitted(USBDriver *usbp, usbep_t ep) { chSysLockFromIsr();
usbStartTransmitI(usbp, ep);
}
- else if (!(usbp->epc[ep]->in_state->txsize &
- (usbp->epc[ep]->in_maxsize - 1))) {
+ else if ((usbp->epc[ep]->in_state->txsize > 0) &&
+ !(usbp->epc[ep]->in_state->txsize &
+ (usbp->epc[ep]->in_maxsize - 1))) {
/* Transmit zero sized packet in case the last one has maximum allowed
size. Otherwise the recipient may expect more data coming soon and
not return buffered data to app. See section 5.8.3 Bulk Transfer
|