mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-23 06:48:16 +00:00
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
|
|
* This file is part of the TREZOR project, https://trezor.io/
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <libopencm3/cm3/common.h>
|
|
#include <libopencm3/stm32/memorymap.h>
|
|
#include <libopencm3/stm32/f2/rng.h>
|
|
|
|
#include "rng.h"
|
|
|
|
#if !EMULATOR
|
|
uint32_t random32(void)
|
|
{
|
|
static uint32_t last = 0, new = 0;
|
|
while (new == last) {
|
|
if ((RNG_SR & (RNG_SR_SECS | RNG_SR_CECS | RNG_SR_DRDY)) == RNG_SR_DRDY) {
|
|
new = RNG_DR;
|
|
}
|
|
}
|
|
last = new;
|
|
return new;
|
|
}
|
|
#endif
|