mirror of https://gerrit.osmocom.org/simtrace2
HACK: Solve weird problem with lost OUT transfer on ping-pong endpoint
This adds an unconditional endpoint reset procedure to every SET_FEATURE(UnHalt). It doesn't really make sense that this is required, *particularly* as we *MUST NOT* set bEndpoint->bank to 0 here. Without this patch, I'm observing the following problem: Every first OUT transfer after a SET_INTERFACE + UNHALT on a bulk endpoint is lost. "lost" means that it completes successfully on the host, can be seen completing successfully with an ACK on a USB bus analyzer, but still doesn't show up in the firmware. No Endpoint Interrupt is generated. This can be reproduced by calling libusb_set_interface_alt_setting() from the host and then submitting a single OUT transfer. Change-Id: I18ed530e617baddf76e8f9829512443ce2a76e0d
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@ -1672,6 +1672,10 @@ uint8_t USBD_HAL_Halt(uint8_t bEndpoint, uint8_t ctl)
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UDP->UDP_RST_EP |= 1 << bEndpoint;
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UDP->UDP_RST_EP &= ~(1 << bEndpoint);
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}
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/* This fixes a weird bug with regard to ping-pong OUT endpoints */
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UDP->UDP_RST_EP |= 1 << bEndpoint;
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UDP->UDP_RST_EP &= ~(1 << bEndpoint);
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}
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/* Return Halt status */
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