Zephyr and the Memory Footprint - Revision history

PTH at 13:52, 26 January 2021

2021-01-26T13:52:53Z

← Older revision		Revision as of 15:52, 26 January 2021
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	=Hello World with LED and Console Output=		=Hello World with LED and Console Output=
	tbd.		tbd.

			=Appendix=
			These examples were tested with a [https://www.st.com/en/evaluation-tools/nucleo-l011k4.html\| nucleo_l011k4] board from ST Microelectronics and Zephyr Version v2.5.0-rc1-40-g7592863643e1. For other boards the numbers may vary slightly. However, these are certainly valid for processors with ARM M0 core.

PTH at 13:29, 26 January 2021

2021-01-26T13:29:45Z

← Older revision		Revision as of 15:29, 26 January 2021
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	</syntaxhighlight>		</syntaxhighlight>
			Ok, thats nice, but how useful is this?. So let's see what a "real" helloworld application needs.
	~~The only question now is~~ how useful this is. So let's see what a "real" helloworld application needs.

	=Hello World with LED and Console Output=		=Hello World with LED and Console Output=
	tbd.		tbd.

PTH at 13:28, 26 January 2021

2021-01-26T13:28:45Z

@@ Line 1: / Line 1: @@
-Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!
+Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? There are a few options and settings to play with. Let's try it!
 On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint.
 Ok let's do it. I compiled the following application by using this configs:
@@ Line 18: / Line 19: @@
 | style="width: 50%; vertical-align:top;"|
 ''prj.conf:''
-<syntaxhighlight lang="c">
+<syntaxhighlight lang="text">
 # disable all peripherals
 CONFIG_GPIO=n
@@ Line 52: / Line 53: @@
 For more details have a look at the Zephyr Docs: [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).
-But how much does a small hello world application need, for example?
+=Hello World with LED and Console Output=

PTH: PTH moved page Zephyr and small Memory Footprint to Zephyr and the Memory Footprint

2021-01-26T11:10:58Z

PTH moved page Zephyr and small Memory Footprint to Zephyr and the Memory Footprint

← Older revision	Revision as of 13:10, 26 January 2021
(No difference)

188.155.159.202 at 11:05, 26 January 2021

2021-01-26T11:05:00Z

← Older revision		Revision as of 13:05, 26 January 2021
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	{\| style="width: 100%;"		{\| style="width: 100%;"
	\| style="width: 50%; vertical-align:top;" \|		\| style="width: 50%; vertical-align:top;" \|
	main.c:		''main.c:''
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	void main (void) {		void main (void) {
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	</syntaxhighlight>		</syntaxhighlight>
	\| style="width: 50%; vertical-align:top;"\|		\| style="width: 50%; vertical-align:top;"\|
	prj.conf:		''prj.conf:''
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	# disable all peripherals		# disable all peripherals
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	CONFIG_BOOT_BANNER=n		CONFIG_BOOT_BANNER=n

	#disable all debug and log messages		# disable all debug and log messages
	CONFIG_DEBUG=n		CONFIG_DEBUG=n

			# enable compiler size opt. (this is the default anyway)
			CONFIG_SIZE_OPTIMIZATIONS=y
	</syntaxhighlight>		</syntaxhighlight>
	\|}		\|}

188.155.159.202 at 10:38, 26 January 2021

2021-01-26T10:38:28Z

← Older revision		Revision as of 12:38, 26 January 2021
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	With this application and settings I could reduce the ~~kernel~~ to '''6872''' bytes:		With this application and settings I could reduce the total application to '''6872''' bytes:

	<syntaxhighlight lang="bash">west build -p auto -b <board name> </syntaxhighlight>		<syntaxhighlight lang="bash">west build -p auto -b <board name> </syntaxhighlight>
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	</syntaxhighlight>		</syntaxhighlight>

	Ok, this is just the kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report (for more details have a look at the Zephyr [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).		Ok, this is just the compiled kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report.
			By using <syntaxhighlight lang="sh" inline> west build -t rom_report </syntaxhighlight> you will get a really nice report of the flash coverage. The same procedure for a ram usage report: <syntaxhighlight lang="sh" inline> west build -t ram_report </syntaxhighlight>
			For more details have a look at the Zephyr Docs: [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).


	But how much does a small hello world application need, for example?		But how much does a small hello world application need, for example?

188.155.159.202 at 10:09, 26 January 2021

2021-01-26T10:09:42Z

← Older revision		Revision as of 12:09, 26 January 2021
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	With this application and settings I could reduce the kernel to 6872 bytes:		With this application and settings I could reduce the kernel to '''6872''' bytes:

	<syntaxhighlight lang="bash">west build -p auto -b <board name> </syntaxhighlight>		<syntaxhighlight lang="bash">west build -p auto -b <board name> </syntaxhighlight>

188.155.159.202 at 10:09, 26 January 2021

2021-01-26T10:09:00Z

@@ Line 1: / Line 1: @@
 Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!
-On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint. With this I could reduce the kernel to 6872 bytes. Ok, this is just the kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report (for more details have a look at the Zephyr [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).
+On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint.
 <syntaxhighlight lang="sh">
@@ Line 9: / Line 44: @@
          IDT_LIST:          56 B         2 KB      2.73%
 </syntaxhighlight>
 But how much does a small hello world application need, for example?

188.155.159.202 at 09:37, 26 January 2021

2021-01-26T09:37:47Z

← Older revision		Revision as of 11:37, 26 January 2021
Line 1:		Line 1:
	Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!		Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!

	On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint. With this I could reduce the kernel to 6872 bytes. Ok, this is just the kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report (for more details have a look at the Zephyr [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).		On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint. With this I could reduce the kernel to 6872 bytes. Ok, this is just the kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report (for more details have a look at the Zephyr [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).

			<syntaxhighlight lang="sh">
			Memory region Used Size Region Size %age Used
			FLASH: 6872 B 16 KB 41.94%
			SRAM: 1232 B 2 KB 60.16%
			IDT_LIST: 56 B 2 KB 2.73%
			</syntaxhighlight>


	But how much does a small hello world application need, for example?		But how much does a small hello world application need, for example?

188.155.159.202 at 08:27, 26 January 2021

2021-01-26T08:27:38Z

← Older revision		Revision as of 10:27, 26 January 2021
Line 1:		Line 1:
	Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!		Do you want to use [https://zephyrproject.org/ Zephyr RTOS] on a Microcontroller with only a few bytes of Flash? Let's try it!

	On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint. With this I could reduce the kernel to 6872 bytes. Ok, this is just the kernel to have an idea how much flash it needs. ~~But how much does~~ a ~~small hello world application need, for example?~~		On the [https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html Optimizing for Footprint] doc site you will find some hints how to reduce the memory footprint. With this I could reduce the kernel to 6872 bytes. Ok, this is just the kernel to have an idea how much flash it needs. You can analyze the memory usage from the rom/ram-report (for more details have a look at the Zephyr [https://docs.zephyrproject.org/latest/guides/optimizations/tools.html Optimization Tools]).

			But how much does a small hello world application need, for example?


	* https://docs.zephyrproject.org/latest/guides/optimizations/footprint.html


	* https://docs.zephyrproject.org/latest/guides/optimizations/tools.html