diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/portable/wch/dcd_ch32_usbfs.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/portable/wch/dcd_ch32_usbfs.c b/src/portable/wch/dcd_ch32_usbfs.c index e8b3c86b2..164b6f7bf 100644 --- a/src/portable/wch/dcd_ch32_usbfs.c +++ b/src/portable/wch/dcd_ch32_usbfs.c @@ -336,10 +336,13 @@ void dcd_int_handler(uint8_t rhport) { switch (token) { case PID_OUT: { #ifdef CH32_USBFS_EP_MANUAL_TOG - // Manual toggle: drop OUT packets whose data toggle doesn't match (host retransmit), - // otherwise flip the expected RX toggle for the next packet. EP0 is driven by the - // SETUP/status flow below, so its toggle is left to that path. - if (ep != 0) { + // Manual toggle. EP0 has no hardware auto-toggle (RB_UEP_AUTO_TOG covers only EP1/2/3/5/6/7), + // so advance its RX toggle on every OUT and always process it; a control-OUT data stage + // longer than the EP0 packet size would otherwise stall on the second packet. For the other + // endpoints, drop toggle-mismatched OUT (host retransmit) and flip the expected RX toggle. + if (ep == 0) { + EP_CTRL(0) ^= USBFS_EPC_R_TOG; + } else { if (!(int_st & USBFS_INT_ST_TOG_OK)) { break; } EP_CTRL(ep) ^= USBFS_EPC_R_TOG; } |