diff options
Diffstat (limited to 'src/stm32/usbfs.c')
| -rw-r--r-- | src/stm32/usbfs.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/stm32/usbfs.c b/src/stm32/usbfs.c index 0ed2e0ee..ad2e7b3e 100644 --- a/src/stm32/usbfs.c +++ b/src/stm32/usbfs.c @@ -255,11 +255,12 @@ usb_send_bulk_in(void *data, uint_fast8_t len) uint32_t epr = USB_EPR[ep]; if (epr_is_dbuf_blocking(epr) && readl(&bulk_in_pop_flag)) { writel(&bulk_in_pop_flag, 0); - if (bipp & BI_START) { + if (unlikely(bipp & BI_START)) { // Two packets are always sent when starting in double // buffering mode, so wait for second packet before starting. if (bipp == (BI_START | 1)) { bulk_in_push_pos = 0; + writel(&bulk_in_pop_flag, USB_EP_KIND); // Dummy flag USB_EPR[ep] = calc_epr_bits(epr, USB_EPTX_STAT , USB_EP_TX_VALID); } |