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Merge pull request #9790 from mikeller/fix_f7_usb_zero_lenght_packet

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Michael Keller 2020-05-14 02:10:58 +12:00 • committed by GitHub
commit 7d6e577803
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1 changed files with 7 additions and 0 deletions
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7
src/main/vcp_hal/usbd_cdc_interface.c
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@ -261,12 +261,19 @@ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
if (hcdc->TxState == 0) {
// endpoint has finished transmitting previous block
if (lastBuffsize) {
bool needZeroLengthPacket = lastBuffsize % 64 == 0;
// move the ring buffer tail based on the previous succesful transmission
UserTxBufPtrOut += lastBuffsize;
if (UserTxBufPtrOut == APP_TX_DATA_SIZE) {
UserTxBufPtrOut = 0;
}
lastBuffsize = 0;
if (needZeroLengthPacket) {
USBD_CDC_SetTxBuffer(&USBD_Device, (uint8_t*)&UserTxBuffer[UserTxBufPtrOut], 0);
return;
}
}
if (UserTxBufPtrOut != UserTxBufPtrIn) {
if (UserTxBufPtrOut > UserTxBufPtrIn) { /* Roll-back */