mirror of
https://github.com/espressif/ESP8266_RTOS_SDK.git
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41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/param.h>
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#include "esp_system.h"
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#include "esp8266/eagle_soc.h"
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extern unsigned int adc_rand_noise;
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uint32_t esp_random(void)
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{
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return (adc_rand_noise ^ REG_READ(WDEV_RAND));
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}
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void esp_fill_random(void *buf, size_t len)
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{
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assert(buf != NULL);
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uint8_t *buf_bytes = (uint8_t *)buf;
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while (len > 0) {
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uint32_t word = esp_random();
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uint32_t to_copy = MIN(sizeof(word), len);
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memcpy(buf_bytes, &word, to_copy);
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buf_bytes += to_copy;
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len -= to_copy;
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}
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}
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