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trezor-firmware/legacy/firmware/usb.h

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