logging: backend: add semihosting (8742d9f2) · Commits · Wenxi XU / zephyr

subsys/logging/backends/CMakeLists.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -74,3 +74,8 @@ zephyr_sources_ifdef(
		CONFIG_LOG_BACKEND_IPC_SERVICE
		log_backend_ipc_service.c
		)

		zephyr_sources_ifdef(
		CONFIG_LOG_BACKEND_SEMIHOST
		log_backend_semihost.c
		)

subsys/logging/backends/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -16,5 +16,6 @@ rsource "Kconfig.swo"
		rsource "Kconfig.uart"
		rsource "Kconfig.xtensa_sim"
		rsource "Kconfig.multidomain"
		rsource "Kconfig.semihost"

		endmenu

subsys/logging/backends/Kconfig.semihost

0 → 100644

+30 −0

Original line number	Diff line number	Diff line
		# Copyright (c) 2024 Contributors to the logging subsystem.
		# SPDX-License-Identifier: Apache-2.0

		config LOG_BACKEND_SEMIHOST
		bool "Semihost as backend"
		depends on SEMIHOST
		select LOG_OUTPUT
		select LOG_BACKEND_SUPPORTS_FORMAT_TIMESTAMP
		help
		Enable backend in semihost (using host stdout)

		if LOG_BACKEND_SEMIHOST

		config LOG_BACKEND_SEMIHOST_BUFFER_SIZE
		int "Size of reserved up-buffer for logger output."
		default 256
		help
		Specify reserved size of up-buffer used for logger output.

		config LOG_BACKEND_SEMIHOST_AUTOSTART
		bool "Autostart semihost backend"
		default y
		help
		Enable semihost backend to start automatically.

		backend = SEMIHOST
		backend-str = semihost
		source "subsys/logging/Kconfig.template.log_format_config"

		endif # LOG_BACKEND_SEMIHOST

subsys/logging/backends/log_backend_semihost.c

0 → 100644

+71 −0

Original line number	Diff line number	Diff line
		/* Copyright (c) 2024 Contributors to the logging subsystem.
		* SPDX-License-Identifier: Apache-2.0
		*/
		#include <stdio.h>
		#include <stddef.h>
		#include <zephyr/logging/log_backend.h>
		#include <zephyr/logging/log_backend_std.h>
		#include <zephyr/logging/log_core.h>
		#include <zephyr/logging/log_output.h>
		#include <zephyr/arch/common/semihost.h>

		static uint8_t buf[CONFIG_LOG_BACKEND_SEMIHOST_BUFFER_SIZE];
		static uint32_t log_format_current = CONFIG_LOG_BACKEND_SEMIHOST_OUTPUT_DEFAULT;

		static int char_out(uint8_t data, size_t length, void ctx)
		{
		ARG_UNUSED(ctx);
		#define SEMIHOST_STDOUT (1)
		int ret = semihost_write(SEMIHOST_STDOUT, data, length);

		if (ret) {
		return ret;
		}

		return length;
		}

		LOG_OUTPUT_DEFINE(log_output_semihost, char_out, buf, sizeof(buf));

		static void panic(struct log_backend const *const backend)
		{
		ARG_UNUSED(backend);

		log_output_flush(&log_output_semihost);
		}

		static void dropped(const struct log_backend *const backend, uint32_t cnt)
		{
		ARG_UNUSED(backend);

		log_output_dropped_process(&log_output_semihost, cnt);
		}

		static void process(const struct log_backend const backend, union log_msg_generic msg)
		{
		ARG_UNUSED(backend);

		uint32_t flags = log_backend_std_get_flags();

		log_format_func_t log_output_func = log_format_func_t_get(log_format_current);

		log_output_func(&log_output_semihost, &msg->log, flags);
		}

		static int format_set(const struct log_backend *const backend, uint32_t log_type)
		{
		ARG_UNUSED(backend);

		log_format_current = log_type;
		return 0;
		}

		const struct log_backend_api log_backend_semihost_api = {
		.process = process,
		.panic = panic,
		.dropped = IS_ENABLED(CONFIG_LOG_MODE_IMMEDIATE) ? NULL : dropped,
		.format_set = format_set,
		};

		LOG_BACKEND_DEFINE(log_backend_semihost, log_backend_semihost_api,
		IS_ENABLED(CONFIG_LOG_BACKEND_SEMIHOST_AUTOSTART));

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