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Add API for random number generator

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This commit is contained in:
Ivan Grokhotkov
2016-11-21 22:59:46 +08:00
parent 46a39b1e0f
commit cf6fc7c741
6 changed files with 119 additions and 3 deletions
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33
components/esp32/hw_random.c Normal file
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// Copyright 2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include "esp_attr.h"
#include "soc/wdev_reg.h"
#include "freertos/FreeRTOSConfig.h"
#include "xtensa/core-macros.h"
uint32_t IRAM_ATTR esp_random(void)
{
static uint32_t last_ccount = 0;
uint32_t ccount;
do {
ccount = XTHAL_GET_CCOUNT();
} while (ccount - last_ccount < XT_CLOCK_FREQ / APB_CLK_FREQ * 16);
last_ccount = ccount;
return REG_READ(WDEV_RND_REG);
}

4
components/esp32/include/soc/soc.h
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@@ -129,10 +129,10 @@
//}}
//Periheral Clock {{
#define APB_CLK_FREQ_ROM 26*1000000
#define APB_CLK_FREQ_ROM ( 26*1000000 )
#define CPU_CLK_FREQ_ROM APB_CLK_FREQ_ROM
#define CPU_CLK_FREQ APB_CLK_FREQ
#define APB_CLK_FREQ 80*1000000 //unit: Hz
#define APB_CLK_FREQ ( 80*1000000 ) //unit: Hz
#define UART_CLK_FREQ APB_CLK_FREQ
#define WDT_CLK_FREQ APB_CLK_FREQ
#define TIMER_CLK_FREQ (80000000>>4) //80MHz divided by 16

18
components/esp32/include/soc/wdev_reg.h Normal file
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// Copyright 2010-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
/* Hardware random number generator register */
#define WDEV_RND_REG 0x60035144