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drivers: entropy: nrf5: Clarify Kconfig options

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Clarify the difference between the buffer length and threshold Kconfig
options available in the nRF5 entropy driver.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2018-04-04 14:15:43 +02:00 • committed by Anas Nashif
commit aaa9cf2edd
1 changed files with 12 additions and 8 deletions
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20
drivers/entropy/Kconfig.nrf5
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@ -28,29 +28,33 @@ config ENTROPY_NRF5_THR_THRESHOLD
int "Thread-mode low-water threshold" int "Thread-mode low-water threshold"
range 4 255 range 4 255
help help
Low-water threshold in bytes to trigger entropy generation for Low water-mark threshold in bytes to trigger entropy generation for
thread mode consumers. thread mode consumers. As soon as the number of available bytes in the
buffer goes below this number hardware entropy generation will be
started.
config ENTROPY_NRF5_ISR_THRESHOLD config ENTROPY_NRF5_ISR_THRESHOLD
int "ISR low-water threshold" int "ISR low-water threshold"
range 12 255 range 12 255
help help
Low-water threshold in bytes to trigger entropy generation for Low water-mark threshold in bytes to trigger entropy generation for
ISR consumers. ISR consumers. As soon as the number of available bytes in the
buffer goes below this number hardware entropy generation will be
started.
config ENTROPY_NRF5_THR_BUF_LEN config ENTROPY_NRF5_THR_BUF_LEN
int "Thread-mode buffer length" int "Thread-mode buffer length"
range ENTROPY_NRF5_THR_THRESHOLD 255 range ENTROPY_NRF5_THR_THRESHOLD 255
help help
Buffer length in bytes to pre-store entropy generation for Buffer length in bytes used to store entropy bytes generated by the
thread mode consumers. hardware to make them ready for thread mode consumers.
config ENTROPY_NRF5_ISR_BUF_LEN config ENTROPY_NRF5_ISR_BUF_LEN
int "ISR buffer length" int "ISR buffer length"
range ENTROPY_NRF5_ISR_THRESHOLD 255 range ENTROPY_NRF5_ISR_THRESHOLD 255
help help
Buffer length in bytes to pre-store entropy generation for Buffer length in bytes used to store entropy bytes generated by the
ISR consumers. hardware to make them ready for ISR consumers.
config ENTROPY_NRF5_PRI config ENTROPY_NRF5_PRI
int "RNG interrupt priority" int "RNG interrupt priority"