kopia lustrzana https://github.com/micropython/micropython
102 wiersze
3.1 KiB
C
102 wiersze
3.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* use of the TRNG by
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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* Copyright (c) 2019 Artur Pacholec
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* Copyright (c) 2022 Robert Hammelrath
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// This file is never compiled standalone, it's included directly from
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// extmod/modos.c via MICROPY_PY_OS_INCLUDEFILE.
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "modmachine.h"
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#include "sam.h"
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#if defined(MCU_SAMD51)
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static bool initialized = false;
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static void trng_start(void) {
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if (!initialized) {
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MCLK->APBCMASK.bit.TRNG_ = 1;
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REG_TRNG_CTRLA = TRNG_CTRLA_ENABLE;
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initialized = true;
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}
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}
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uint32_t trng_random_u32(void) {
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trng_start();
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while ((REG_TRNG_INTFLAG & TRNG_INTFLAG_DATARDY) == 0) {
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}
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return REG_TRNG_DATA;
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}
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#define TRNG_RANDOM_U32 trng_random_u32()
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#endif // defined(MCU_SAMD51)
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#if defined(MCU_SAMD21)
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extern volatile uint32_t rng_state;
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uint32_t trng_random_u32(int delay) {
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mp_hal_delay_ms(delay); // wait a few cycles
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uint32_t upper = rng_state;
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mp_hal_delay_ms(delay); // wait again a few cycles
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return (upper & 0xffff0000) | (rng_state >> 16);
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}
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#define trng_start()
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#define TRNG_RANDOM_U32 trng_random_u32(10)
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#endif
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#if MICROPY_PY_OS_URANDOM
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static mp_obj_t mp_os_urandom(mp_obj_t num) {
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mp_int_t n = mp_obj_get_int(num);
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vstr_t vstr;
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vstr_init_len(&vstr, n);
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uint32_t rngval = 0;
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trng_start();
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for (int i = 0; i < n; i++) {
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if ((i % 4) == 0) {
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rngval = TRNG_RANDOM_U32;
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}
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vstr.buf[i] = rngval & 0xff;
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rngval >>= 8;
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}
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return mp_obj_new_bytes_from_vstr(&vstr);
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}
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static MP_DEFINE_CONST_FUN_OBJ_1(mp_os_urandom_obj, mp_os_urandom);
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#endif // MICROPY_PY_OS_URANDOM
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#if MICROPY_PY_OS_DUPTERM_BUILTIN_STREAM
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bool mp_os_dupterm_is_builtin_stream(mp_const_obj_t stream) {
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const mp_obj_type_t *type = mp_obj_get_type(stream);
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return type == &machine_uart_type;
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}
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#endif
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