diff options
| -rw-r--r-- | src/portable/wch/dcd_ch32_usbfs.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/src/portable/wch/dcd_ch32_usbfs.c b/src/portable/wch/dcd_ch32_usbfs.c index f4cbb8ca9..22c7a43fa 100644 --- a/src/portable/wch/dcd_ch32_usbfs.c +++ b/src/portable/wch/dcd_ch32_usbfs.c @@ -335,17 +335,15 @@ void dcd_int_handler(uint8_t rhport) { switch (token) { case PID_OUT: { + // Drop an OUT packet whose data toggle doesn't match what we expect -- a host retransmit + // after a lost ACK, or a host that doesn't alternate DATA0/DATA1. The hardware auto-toggle + // does not reject these on its own, so the check is needed on every variant. EP0 keeps its + // own toggle via the SETUP/status flow and is exempt. + if (ep != 0 && !(int_st & USBFS_INT_ST_TOG_OK)) { break; } #ifdef CH32_USBFS_EP_MANUAL_TOG - // 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; - } + // CH58x has no hardware auto-toggle: advance the expected RX toggle after each accepted packet + // (EP0 included -- it also has no auto-toggle and a control-OUT data stage can span packets). + EP_CTRL(ep) ^= USBFS_EPC_R_TOG; #endif update_out(rhport, ep, rx_len); break; |