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Kconfig
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#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
# Ethernet over RTT driver configuration options
if HAS_SEGGER_RTT
menuconfig ETH_RTT
select USE_SEGGER_RTT
select NET_L2_ETHERNET
select CRC
bool "Ethernet over RTT driver"
help
This option enables network interface driver that sends and receives
ethernet frames over RTT channel. The driver is intended primary for
debugging and testing.
if ETH_RTT
config ETH_RTT_MAC_ADDR
string "MAC address for the interface"
default ""
help
Specify a MAC address for the Ethernet over RTT network interface
in the form of hex 8-bit chars separated by colons
(e.g.: aa:33:cc:22:e2:c0). The default is an empty string, which
selects random address (00:00:5E:00:53:xx) according to RFC 7042.
config ETH_RTT_CHANNEL
int "RTT channel number"
default 2
help
Sets RTT channel that will be used to transfer ethernet frames in
both directions. Channels 0 and 1 have special purpose defined by
SEGGER, so it is safer to use channel 2 or above. This number must be
smaller than SEGGER_RTT_MAX_NUM_UP_BUFFERS and cannot be used by any
other module.
config ETH_RTT_UP_BUFFER_SIZE
int "RTT up buffer size"
default 256 if SOC_NRF52810 || SOC_SERIES_NRF51X
default 1024 if SOC_NRF52832
default 3072
range 16 1048576
help
Sets RTT buffer size for sending ethernet frames. Smaller values will
save the RAM, but will decrease the performance.
config ETH_RTT_DOWN_BUFFER_SIZE
int "RTT down buffer size"
default 128 if SOC_NRF52810 || SOC_SERIES_NRF51X
default 512 if SOC_NRF52832
default 3072
range 16 1048576
help
Sets RTT buffer size for receiving ethernet frames. Smaller values
will save the RAM, but will decrease the performance.
config ETH_RTT_MTU
int "Maximum Transmission Unit (MTU)"
default 1500
range 68 65536
help
Sets the Maximum Transmission Unit (MTU) for the Ethernet over RTT
network interface. Ethernet default is 1500 and using different value
may cause unpredictable behavior. Change this value only if you
really known what you are doing. IPv4 requires at least 68 and IPv6
requires at least 1280.
config ETH_POLL_PERIOD_MS
int "Receive polling period (ms)"
default 25
range 1 200
help
RTT has no interrupt, so read have to be done using polling. This
option sets time in milliseconds between two consecutive RTT read
attempts when there is no input transfer for some time. When transfer
is currently running ETH_POLL_ACTIVE_PERIOD_MS is used instead.
config ETH_POLL_ACTIVE_PERIOD_MS
int "Receive polling period when transfer is running (ms)"
default 5
range 1 ETH_POLL_PERIOD_MS
help
This option sets time in milliseconds between two consecutive RTT
read attempts when input transfer is running. When transfer stopped
some time ago driver will use ETH_POLL_PERIOD_MS again.
module=ETH_RTT
module-dep=LOG
module-str=Log level
module-help=Sets log level for Ethernet over RTT driver.
source "$(ZEPHYR_BASE)/subsys/net/Kconfig.template.log_config.net"
config ETH_RTT_DEBUG_HEX_DUMP
bool "Print hex dumps"
depends on ETH_RTT_LOG_LEVEL >= 4
help
Enabling this option prints out hex dumps of transferred data. There
are four types of hex dumps: data that flows from RTT, data that
flows to RTT, frames that are passed to network stack, frames that
are get from network stack. This option will produce a lot of debug
logs, so if you reading it make sure that logger did not discard
something because of buffer overrun.
endif
endif