diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/portable/synopsys/dwc2/hcd_dwc2.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/portable/synopsys/dwc2/hcd_dwc2.c b/src/portable/synopsys/dwc2/hcd_dwc2.c index 2055b320b..5a171f80e 100644 --- a/src/portable/synopsys/dwc2/hcd_dwc2.c +++ b/src/portable/synopsys/dwc2/hcd_dwc2.c @@ -44,7 +44,8 @@ enum { enum { HCD_XFER_PERIOD_SPLIT_NYET_MAX = 3, - HCD_FRAME_NUMBER_MASK = 0x3fff + HCD_FRAME_NUMBER_MASK = 0x3fff, + HCD_FRAME_COUNT = HCD_FRAME_NUMBER_MASK + 1 }; //-------------------------------------------------------------------- @@ -652,6 +653,13 @@ bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, const tusb_desc_endpoint_t* break; } + if (channel_is_periodic(edpt->hcchar)) { + // HFNUM cannot distinguish elapsed periods longer than one counter cycle. USB permits the host to provide a + // shorter period, so bound the selected period to the history available from HFNUM. + const uint32_t ucount = (rh_speed == TUSB_SPEED_HIGH) ? 1u : 8u; + edpt->uframe_interval = tu_min32(edpt->uframe_interval, HCD_FRAME_COUNT * ucount); + } + return true; } |