# Kconfig.nrf5 - nRF5 entropy generator driver configuration
#
# Copyright (c) 2018 Nordic Semiconductor ASA
# Copyright (c) 2017 Exati Tecnologia Ltda.
#
# SPDX-License-Identifier: Apache-2.0

menuconfig ENTROPY_NRF5_RNG
	bool "nRF5 RNG driver"
	depends on ENTROPY_GENERATOR
	select ENTROPY_HAS_DRIVER
	help
	  This option enables the RNG peripheral, which is a random number
	  generator, based on internal thermal noise, that provides a
	  random 8-bit value to the host when read.

if ENTROPY_NRF5_RNG

config ENTROPY_NRF5_BIAS_CORRECTION
	bool "Enable bias correction (uniform distribution)"
	depends on ENTROPY_NRF5_RNG
	help
	  This option enables the RNG bias correction, which guarantees a
	  uniform distribution of 0 and 1. When this option is enabled, the time
	  to generate a byte cannot be guaranteed.

config ENTROPY_NRF5_THR_THRESHOLD
	int "Thread-mode low-water threshold"
	range 4 255
	help
	  Low-water threshold in bytes to trigger entropy generation for
	  thread mode consumers.

config ENTROPY_NRF5_ISR_THRESHOLD
	int "ISR low-water threshold"
	range 12 255
	help
	  Low-water threshold in bytes to trigger entropy generation for
	  ISR consumers.

config ENTROPY_NRF5_THR_BUF_LEN
	int "Thread-mode buffer length"
	range ENTROPY_NRF5_THR_THRESHOLD 255
	help
	  Buffer length in bytes to pre-store entropy generation for
	  thread mode consumers.

config ENTROPY_NRF5_ISR_BUF_LEN
	int "ISR buffer length"
	range ENTROPY_NRF5_ISR_THRESHOLD 255
	help
	  Buffer length in bytes to pre-store entropy generation for
	  ISR consumers.

config ENTROPY_NRF5_PRI
	int "RNG interrupt priority"
	depends on ENTROPY_NRF5_RNG
	range 0 2 if SOC_SERIES_NRF51X
	range 0 5 if SOC_SERIES_NRF52X
	default 2 if SOC_SERIES_NRF51X
	default 5 if SOC_SERIES_NRF52X
	help
	  nRF5X RNG IRQ priority.

endif #ENTROPY_NRF5_RNG