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core/usb: Ensure that USB interface is not busy before writing.

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This commit is contained in:
Andrew Kozlik 2019-08-08 15:22:34 +02:00
parent 6ad3294f31
commit 2142b37f86
1 changed files with 4 additions and 0 deletions
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4
core/embed/trezorhal/usb_hid-impl.h
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@ -184,6 +184,10 @@ int usb_hid_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
}
usb_hid_state_t *state = &iface->hid;
if (state->ep_in_is_idle == 0) {
return 0; // Last transmission is not over yet
}
state->ep_in_is_idle = 0;
USBD_LL_Transmit(&usb_dev_handle, state->ep_in, UNCONST(buf), (uint16_t)len);