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Fix Kinetis bug causing USB to get stuck sending 

If an IN endpoint is stalled during a transfer by writing to the
USB ENDPOINT register then the data being sent will repeat and flood
the USB bus. This patch prevents the register write from occurring by
instead writing to the buffer descriptor in RAM and letting the USB
hardware handle setting the stall bit.

Note - Control requests on endpoint 0 do still set the STALL bit
directly. This is not a problem since control endpoints cannot be
stalled externally while a transfer is ongoing.
feature-hal-spec-usb-device
Russ Butler 2018-06-13 20:25:41 -05:00
parent cbda2fb575
commit 073068aa36
1 changed files with 13 additions and 1 deletions
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14
usb/device/targets/TARGET_Freescale/USBPhy_Kinetis.cpp
View File

@ -411,11 +411,23 @@ void USBPhyHw::endpoint_remove(usb_ep_t endpoint)
void USBPhyHw::endpoint_stall(usb_ep_t endpoint)
{
USB0->ENDPOINT[DESC_TO_LOG(endpoint)].ENDPT |= USB_ENDPT_EPSTALL_MASK;
if (DESC_TO_LOG(endpoint) == 0) {
USB0->ENDPOINT[DESC_TO_LOG(endpoint)].ENDPT |= USB_ENDPT_EPSTALL_MASK;
} else {
uint8_t dir = DESC_EP_IN(endpoint) ? TX : RX;
uint32_t idx = EP_BDT_IDX(DESC_TO_LOG(endpoint), dir, 0);
bdt[idx].info |= BD_OWN_MASK | BD_STALL_MASK;
}
}
void USBPhyHw::endpoint_unstall(usb_ep_t endpoint)
{
if (DESC_TO_LOG(endpoint) != 0) {
uint8_t dir = DESC_EP_IN(endpoint) ? TX : RX;
uint32_t idx = EP_BDT_IDX(DESC_TO_LOG(endpoint), dir, 0);
bdt[idx].info &= ~(BD_OWN_MASK | BD_STALL_MASK);
}
USB0->ENDPOINT[DESC_TO_LOG(endpoint)].ENDPT &= ~USB_ENDPT_EPSTALL_MASK;
}