# 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.

menu "ADC Noise entropy source module"
    depends on USEMODULE_ENTROPY_SOURCE_ADC_NOISE

choice
    bool "ADC default sampling resolution"
    default ENTROPY_SOURCE_ADC_RES_10BIT
    help
        This parameter sets the ADC sampling resolution. Please note that not all
        platforms support every value.

config ENTROPY_SOURCE_ADC_RES_6BIT
    bool "6 Bit"

config ENTROPY_SOURCE_ADC_RES_8BIT
    bool "8 Bit"

config ENTROPY_SOURCE_ADC_RES_10BIT
    bool "10 Bit"

config ENTROPY_SOURCE_ADC_RES_12BIT
    bool "12 Bit"

config ENTROPY_SOURCE_ADC_RES_14BIT
    bool "14 Bit"

config ENTROPY_SOURCE_ADC_RES_16BIT
    bool "16 Bit"

endchoice

config ENTROPY_SOURCE_ADC_LINE_NUM
    int "ADC line"
    range 0 16
    default 0
    help
        The ADC line maps to an I/O pin. This number acts as index to an array
        of predefined ADC devices that contain the pin definition. Typically,
        the array is defined by a board in a periph_conf.h file. Please note that
        a board is not required to specify a minimum number of lines.

config ENTROPY_SOURCE_ADC_HMIN
    int "Estimated entropy per sample [2^16 * bit/sample]"
    range 1 524288
    default 0
    help
        The entropy value needs to be estimated and evaluated thoroughly before
        deployment! To avoid float, the entropy value per one byte sample needs
        to be manually multiplied by 2^16 before configuring it (e.g., to
        an entropy value of 1 bit/sample, a value of 1 * 65536 needs to be set) .
        We default to zero which is an invalid configuration to enforce a
        thoughtful investigation on the actual entropy properties.

config ENTROPY_SOURCE_ADC_HEALTH_TEST
    bool "Enable health test"
    help
        Health tests are performed on every sample, if enabled. Thus, they
        slow down the entropy gathering process. Detected failures are reported by return
        value but they do not stop execution.

config ENTROPY_SOURCE_ADC_COND
    bool "Enable conditioning"
    help
        Conditioning increases runtime of the entropy generation process. Currently, a von
        Neumann extractor is involved which has an nondeterministic runtime.

endmenu # ADC Noise entropy source module