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https://github.com/trezor/trezor-firmware.git
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59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __USB_H__
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#define __USB_H__
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#define USB_PACKET_SIZE 64
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void usbInit(void);
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void usbPoll(void);
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void usbReconnect(void);
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/*
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* Setting this value to 1 will limit the protobuf messages `usbPoll` and
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* `waitAndProcessUSBRequests` can handle to a few defined in `msg_read_tiny`.
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*
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* Also affects U2F and DebugLink messages.
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*
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* Setting to 1 is meant to prevent infinite recursion when you need to read a
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* message while being called from FSM.
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*
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* Setting to 0 allows processing all messages.
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*/
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char usbTiny(char set);
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/*
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* This will wait given number of milliseconds for arrival of protobuf message.
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* If it arrives, it will service it before returning.
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*
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* If you call this function from any function that is called from FSM,
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* you must use `usbTiny(1)` before and `usbTiny(oldTinyValue)` or `usbTiny(0)`
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* after, otherwise there is possibility of stack exhaustion.
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*/
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void waitAndProcessUSBRequests(uint32_t millis);
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/*
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* Flush out any messages still in USB bus FIFO while waiting given number
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* of milliseconds. Any incoming USB protobuf messages are not serviced.
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*/
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void usbFlush(uint32_t millis);
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#endif
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