diff options
| -rw-r--r-- | stmhal/usbd_cdc_interface.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/stmhal/usbd_cdc_interface.c b/stmhal/usbd_cdc_interface.c index 1c12cdc1c8..647fe09e99 100644 --- a/stmhal/usbd_cdc_interface.c +++ b/stmhal/usbd_cdc_interface.c @@ -261,8 +261,10 @@ void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd) { if (UserTxBufPtrOut != UserTxBufPtrOutShadow) { // We have sent data and are waiting for the low-level USB driver to // finish sending it over the USB in-endpoint. - // SOF occurs every 1ms, so we have a 150 * 1ms = 150ms timeout - if (UserTxBufPtrWaitCount < 150) { + // SOF occurs every 1ms, so we have a 500 * 1ms = 500ms timeout + // We have a relatively large timeout because the USB host may be busy + // doing other things and we must give it a chance to read our data. + if (UserTxBufPtrWaitCount < 500) { USB_OTG_GlobalTypeDef *USBx = hpcd->Instance; if (USBx_INEP(CDC_IN_EP & 0x7f)->DIEPTSIZ & USB_OTG_DIEPTSIZ_XFRSIZ) { // USB in-endpoint is still reading the data |