kopia lustrzana https://github.com/micropython/micropython
224 wiersze
7.1 KiB
C
224 wiersze
7.1 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 Paul Sokolovsky
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* Copyright (c) 2016 Damien P. George
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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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#include <assert.h>
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#include <string.h>
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#include "py/runtime.h"
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#if MICROPY_PY_RANDOM_HW_RNG
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#include "nrf_rng.h"
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#include "modrandom.h"
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#if BLUETOOTH_SD
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#include "nrf_soc.h"
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#include "ble_drv.h"
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#define BLUETOOTH_STACK_ENABLED() (ble_drv_stack_enabled())
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#endif
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static inline uint32_t generate_hw_random(void) {
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uint32_t retval = 0;
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uint8_t * p_retval = (uint8_t *)&retval;
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nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY);
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nrf_rng_task_trigger(NRF_RNG_TASK_START);
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for (uint16_t i = 0; i < 4; i++) {
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while (!nrf_rng_event_get(NRF_RNG_EVENT_VALRDY)) {
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;
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}
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nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY);
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p_retval[i] = nrf_rng_random_value_get();
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}
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nrf_rng_task_trigger(NRF_RNG_TASK_STOP);
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return retval;
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}
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uint32_t machine_rng_generate_random_word(void) {
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#if BLUETOOTH_SD
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if (BLUETOOTH_STACK_ENABLED() == 1) {
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uint32_t retval = 0;
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uint32_t status;
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do {
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status = sd_rand_application_vector_get((uint8_t *)&retval, 4); // Extract 4 bytes
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} while (status != 0);
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return retval;
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}
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#endif
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return generate_hw_random();
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}
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static inline int rand30(void) {
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uint32_t val = machine_rng_generate_random_word();
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return (val & 0x3fffffff); // binary mask b00111111111111111111111111111111
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}
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static inline int randbelow(int n) {
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return rand30() % n;
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}
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STATIC mp_obj_t mod_random_getrandbits(mp_obj_t num_in) {
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int n = mp_obj_get_int(num_in);
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if (n > 30 || n == 0) {
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mp_raise_ValueError(NULL);
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}
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uint32_t mask = ~0;
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// Beware of C undefined behavior when shifting by >= than bit size
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mask >>= (32 - n);
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return mp_obj_new_int_from_uint(rand30() & mask);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_random_getrandbits_obj, mod_random_getrandbits);
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STATIC mp_obj_t mod_random_randrange(size_t n_args, const mp_obj_t *args) {
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mp_int_t start = mp_obj_get_int(args[0]);
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if (n_args == 1) {
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// range(stop)
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if (start > 0) {
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return mp_obj_new_int(randbelow(start));
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} else {
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mp_raise_ValueError(NULL);
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}
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} else {
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mp_int_t stop = mp_obj_get_int(args[1]);
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if (n_args == 2) {
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// range(start, stop)
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if (start < stop) {
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return mp_obj_new_int(start + randbelow(stop - start));
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} else {
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mp_raise_ValueError(NULL);
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}
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} else {
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// range(start, stop, step)
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mp_int_t step = mp_obj_get_int(args[2]);
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mp_int_t n;
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if (step > 0) {
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n = (stop - start + step - 1) / step;
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} else if (step < 0) {
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n = (stop - start + step + 1) / step;
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} else {
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mp_raise_ValueError(NULL);
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}
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if (n > 0) {
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return mp_obj_new_int(start + step * randbelow(n));
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} else {
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mp_raise_ValueError(NULL);
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}
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}
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_random_randrange_obj, 1, 3, mod_random_randrange);
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STATIC mp_obj_t mod_random_randint(mp_obj_t a_in, mp_obj_t b_in) {
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mp_int_t a = mp_obj_get_int(a_in);
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mp_int_t b = mp_obj_get_int(b_in);
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if (a <= b) {
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return mp_obj_new_int(a + randbelow(b - a + 1));
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} else {
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mp_raise_ValueError(NULL);
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_random_randint_obj, mod_random_randint);
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STATIC mp_obj_t mod_random_choice(mp_obj_t seq) {
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mp_int_t len = mp_obj_get_int(mp_obj_len(seq));
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if (len > 0) {
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return mp_obj_subscr(seq, mp_obj_new_int(randbelow(len)), MP_OBJ_SENTINEL);
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} else {
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nlr_raise(mp_obj_new_exception(&mp_type_IndexError));
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_random_choice_obj, mod_random_choice);
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#if MICROPY_PY_BUILTINS_FLOAT
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// returns a number in the range [0..1) using RNG to fill in the fraction bits
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STATIC mp_float_t randfloat(void) {
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#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
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typedef uint64_t mp_float_int_t;
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#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
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typedef uint32_t mp_float_int_t;
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#endif
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union {
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mp_float_t f;
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#if MP_ENDIANNESS_LITTLE
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struct { mp_float_int_t frc:MP_FLOAT_FRAC_BITS, exp:MP_FLOAT_EXP_BITS, sgn:1; } p;
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#else
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struct { mp_float_int_t sgn:1, exp:MP_FLOAT_EXP_BITS, frc:MP_FLOAT_FRAC_BITS; } p;
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#endif
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} u;
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u.p.sgn = 0;
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u.p.exp = (1 << (MP_FLOAT_EXP_BITS - 1)) - 1;
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if (MP_FLOAT_FRAC_BITS <= 30) {
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u.p.frc = rand30();
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} else {
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u.p.frc = ((uint64_t)rand30() << 30) | (uint64_t)rand30();
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}
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return u.f - 1;
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}
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STATIC mp_obj_t mod_random_random(void) {
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return mp_obj_new_float(randfloat());
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(mod_random_random_obj, mod_random_random);
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STATIC mp_obj_t mod_random_uniform(mp_obj_t a_in, mp_obj_t b_in) {
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mp_float_t a = mp_obj_get_float(a_in);
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mp_float_t b = mp_obj_get_float(b_in);
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return mp_obj_new_float(a + (b - a) * randfloat());
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_random_uniform_obj, mod_random_uniform);
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#endif
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STATIC const mp_rom_map_elem_t mp_module_random_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_random) },
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{ MP_ROM_QSTR(MP_QSTR_getrandbits), MP_ROM_PTR(&mod_random_getrandbits_obj) },
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{ MP_ROM_QSTR(MP_QSTR_randrange), MP_ROM_PTR(&mod_random_randrange_obj) },
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{ MP_ROM_QSTR(MP_QSTR_randint), MP_ROM_PTR(&mod_random_randint_obj) },
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{ MP_ROM_QSTR(MP_QSTR_choice), MP_ROM_PTR(&mod_random_choice_obj) },
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#if MICROPY_PY_BUILTINS_FLOAT
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{ MP_ROM_QSTR(MP_QSTR_random), MP_ROM_PTR(&mod_random_random_obj) },
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{ MP_ROM_QSTR(MP_QSTR_uniform), MP_ROM_PTR(&mod_random_uniform_obj) },
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#endif
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_random_globals, mp_module_random_globals_table);
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const mp_obj_module_t random_module = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&mp_module_random_globals,
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};
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#endif // MICROPY_PY_RANDOM_HW_RNG
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