adc_noise.h

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/*
 * Copyright (C) 2020 HAW Hamburg
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <inttypes.h>
#include <stddef.h>
 
#include "periph/adc.h"

#if IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_6BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_6BIT
#elif IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_8BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_8BIT
#elif IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_10BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_10BIT
#elif IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_12BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_12BIT
#elif IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_14BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_14BIT
#elif IS_ACTIVE(CONFIG_ENTROPY_SOURCE_ADC_RES_16BIT)
#define CONFIG_ENTROPY_SOURCE_ADC_RES          ADC_RES_16BIT
#endif
#ifndef CONFIG_ENTROPY_SOURCE_ADC_RES
#define CONFIG_ENTROPY_SOURCE_ADC_RES   ADC_RES_10BIT
#endif

#ifdef CONFIG_ENTROPY_SOURCE_ADC_LINE_NUM
#define CONFIG_ENTROPY_SOURCE_ADC_LINE         ADC_LINE(CONFIG_ENTROPY_SOURCE_ADC_LINE_NUM)
#else
#define CONFIG_ENTROPY_SOURCE_ADC_LINE         ADC_LINE(0)
#endif

#if !defined(CONFIG_KCONFIG_USEMODULE_ENTROPY_SOURCE_ADC_NOISE) || defined(DOXYGEN)
#ifndef CONFIG_ENTROPY_SOURCE_ADC_HMIN
#define CONFIG_ENTROPY_SOURCE_ADC_HMIN         (0)  
#endif /* !CONFIG_ENTROPY_SOURCE_ADC_HMIN */
 
#ifndef CONFIG_ENTROPY_SOURCE_ADC_HEALTH_TEST
#define CONFIG_ENTROPY_SOURCE_ADC_HEALTH_TEST  0  
#endif
#ifndef CONFIG_ENTROPY_SOURCE_ADC_COND
#define CONFIG_ENTROPY_SOURCE_ADC_COND         0   
#endif
#endif /* !CONFIG_KCONFIG_USEMODULE_ENTROPY_SOURCE_ADC_NOISE || DOXYGEN */
 
/* Throw warning if H_min has not been re-configured */
#if !CONFIG_ENTROPY_SOURCE_ADC_HMIN
#warning The min. provided entropy must be set before using this module
#endif

int entropy_source_adc_init(void);

int entropy_source_adc_get(uint8_t *buf, size_t len);

static inline uint32_t entropy_source_adc_entropy_per_sample(void)
{
    return CONFIG_ENTROPY_SOURCE_ADC_HMIN;
}
 
#ifdef __cplusplus
}
#endif