diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/generic/usb_cdc.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/generic/usb_cdc.c b/src/generic/usb_cdc.c index 143c213f..961c6330 100644 --- a/src/generic/usb_cdc.c +++ b/src/generic/usb_cdc.c @@ -44,11 +44,13 @@ usb_bulk_in_task(void) { if (!sched_check_wake(&usb_bulk_in_wake)) return; - uint_fast8_t tpos = transmit_pos; + uint_fast8_t tpos = transmit_pos, max_tpos = tpos; if (!tpos) return; - uint_fast8_t max_tpos = (tpos > USB_CDC_EP_BULK_IN_SIZE - ? USB_CDC_EP_BULK_IN_SIZE : tpos); + if (max_tpos > USB_CDC_EP_BULK_IN_SIZE) + max_tpos = USB_CDC_EP_BULK_IN_SIZE; + else if (max_tpos == USB_CDC_EP_BULK_IN_SIZE) + max_tpos = USB_CDC_EP_BULK_IN_SIZE-1; // Avoid zero-length-packets int_fast8_t ret = usb_send_bulk_in(transmit_buf, max_tpos); if (ret <= 0) return; |