109 lines
3.4 KiB
Plaintext
109 lines
3.4 KiB
Plaintext
# Copyright (c) 2021 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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config LOG_BACKEND_RTT
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bool "Segger J-Link RTT backend"
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depends on USE_SEGGER_RTT
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default y if !SHELL_BACKEND_RTT
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select SEGGER_RTT_CUSTOM_LOCKING
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select LOG_BACKEND_SUPPORTS_FORMAT_TIMESTAMP
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help
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When enabled, backend will use RTT for logging. This backend works on a per
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message basis. Only a whole message (terminated with a carriage return: '\r')
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is transferred to up-buffer at once depending on available space and
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selected mode.
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In panic mode backend always blocks and waits until there is space
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in up-buffer for a message and message is transferred to host.
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if LOG_BACKEND_RTT
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choice LOG_BACKEND_RTT_MODE
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prompt "Logger behavior"
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default LOG_BACKEND_RTT_MODE_BLOCK
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config LOG_BACKEND_RTT_MODE_DROP
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bool "Drop messages that do not fit in up-buffer."
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help
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If there is not enough space in up-buffer for a message, drop it.
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Number of dropped messages will be logged.
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Increase up-buffer size helps to reduce dropping of messages.
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config LOG_BACKEND_RTT_MODE_BLOCK
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bool "Block until message is transferred to host."
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help
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Waits until there is enough space in the up-buffer for a message.
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config LOG_BACKEND_RTT_MODE_OVERWRITE
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bool "Overwrite messages if up-buffer full"
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help
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If there is not enough space in up-buffer for a message overwrite
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oldest one.
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endchoice
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backend = RTT
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backend-str = rtt
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source "subsys/logging/Kconfig.template.log_format_config"
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config LOG_BACKEND_RTT_MESSAGE_SIZE
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int "Size of internal buffer for storing messages."
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range 32 256
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default 128
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depends on LOG_BACKEND_RTT_MODE_DROP
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help
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This option defines maximum message size transferable to up-buffer.
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if LOG_BACKEND_RTT_MODE_BLOCK
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config LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE
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int "Size of the output buffer"
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default 16
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help
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Buffer is used by log_output module for preparing output data (e.g.
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string formatting).
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config LOG_BACKEND_RTT_RETRY_CNT
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int "Number of retries"
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default 4
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help
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Number of TX retries before dropping the data and assuming that
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RTT session is inactive.
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config LOG_BACKEND_RTT_RETRY_DELAY_MS
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int "Delay between TX retries in milliseconds"
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default 5
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help
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Sleep period between TX retry attempts. During RTT session, host pulls
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data periodically. Period starts from 1-2 milliseconds and can be
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increased if traffic on RTT increases (also from host to device). In
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case of heavy traffic data can be lost and it may be necessary to
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increase delay or number of retries.
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endif # LOG_BACKEND_RTT_MODE_BLOCK
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config LOG_BACKEND_RTT_BUFFER
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int "Buffer number used for logger output."
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range 0 SEGGER_RTT_MAX_NUM_UP_BUFFERS
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default 0
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help
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Select index of up-buffer used for logger output, by default it uses
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terminal up-buffer and its settings.
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config LOG_BACKEND_RTT_BUFFER_SIZE
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int "Size of reserved up-buffer for logger output."
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default 1024
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depends on LOG_BACKEND_RTT_BUFFER > 0
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help
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Specify reserved size of up-buffer used for logger output.
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# Enable processing of printk calls using log if terminal buffer is used.
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# Same buffer is used by RTT console. If printk would go through RTT console
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# that will lead to corruption of RTT data which is not protected against being
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# interrupted by an interrupt.
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config LOG_BACKEND_RTT_FORCE_PRINTK
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bool
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default y if LOG_BACKEND_RTT_BUFFER = 0 && RTT_CONSOLE
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select LOG_PRINTK
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endif # LOG_BACKEND_RTT
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