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dcd_pic: handle EP0 timeout/stall correctly

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This commit is contained in:
Reimu NotMoe 2024-12-27 01:02:10 +08:00
parent 0192b2a9b0
commit 6e11406831
1 changed files with 12 additions and 1 deletions
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13
src/portable/microchip/pic/dcd_pic.c
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@ -316,12 +316,23 @@ static void prepare_next_setup_packet(uint8_t rhport)
{
const unsigned out_odd = _dcd.endpoint[0][0].odd;
const unsigned in_odd = _dcd.endpoint[0][1].odd;
TU_ASSERT(0 == _dcd.bdt[0][0][out_odd].own, );
// Abandon any previous control transfers that might have been using EP0.
// Ordinarily, nothing actually needs abandoning, since the previous control
// transfer would have completed successfully prior to the host sending the
// next SETUP packet. However, in a timeout error case, or after an EP0
// STALL event, one or more UOWN bits might still be set. If so, we should
// clear the UOWN bits, so the EP0 IN/OUT endpoints are in a known inactive
// state, ready for re-arming by the `dcd_edpt_xfer' function that will be
// called next.
_dcd.bdt[0][0][out_odd].data = 0;
_dcd.bdt[0][0][out_odd].own = 0;
_dcd.bdt[0][0][out_odd ^ 1].data = 1;
_dcd.bdt[0][1][in_odd].data = 1;
_dcd.bdt[0][1][in_odd].own = 0;
_dcd.bdt[0][1][in_odd ^ 1].data = 0;
_dcd.bdt[0][1][in_odd ^ 1].own = 0;
dcd_edpt_xfer(rhport, tu_edpt_addr(0, TUSB_DIR_OUT),
_dcd.setup_packet, sizeof(_dcd.setup_packet));
}