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  VS Arduino › › › ESP8266: Compiler displays wrong flash size
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Normal Topic ESP8266: Compiler displays wrong flash size (Read 4855 times)
Red Baron
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ESP8266: Compiler displays wrong flash size
Oct 26th, 2016 at 2:29pm
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Hi,

I hope it's only a problem of the program that shows the statistics!

Board options are
- (NodeMCU 1.0, ESP-12) 
- Flash Size 4MB (1 MB SPIFFS)

When compiling a program for an ESP8266 I get the following output:
      Program size: 221.995 bytes (used 21% of a 1.044.464 byte maximum)
It is an empty program, only an empty setup and an empty loop function is definied.

I think maximum should be 3.133.392.

Im using version 1.1609.4 with visual studio 2015. The build paramters are:
Board Properties
Code
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name=NodeMCU 1.0 (ESP-12E Module)
upload.tool=esptool
upload.speed=115200
upload.resetmethod=nodemcu
upload.maximum_size=1044464
upload.maximum_data_size=81920
upload.wait_for_upload_port=true
serial.disableDTR=true
serial.disableRTS=true
build.mcu=esp8266
build.f_cpu=80000000L
build.board=ESP8266_NODEMCU
build.core=esp8266
build.variant=nodemcu
build.flash_mode=dio
build.flash_size=4M
build.flash_freq=40
build.debug_port=
build.debug_level=
menu.CpuFrequency.80=80 MHz
menu.CpuFrequency.80.build.f_cpu=80000000L
menu.CpuFrequency.160=160 MHz
menu.CpuFrequency.160.build.f_cpu=160000000L
menu.UploadSpeed.115200=115200
menu.UploadSpeed.115200.upload.speed=115200
menu.UploadSpeed.9600=9600
menu.UploadSpeed.9600.upload.speed=9600
menu.UploadSpeed.57600=57600
menu.UploadSpeed.57600.upload.speed=57600
menu.UploadSpeed.256000.windows=256000
menu.UploadSpeed.256000.upload.speed=256000
menu.UploadSpeed.230400.linux=230400
menu.UploadSpeed.230400.macosx=230400
menu.UploadSpeed.230400.upload.speed=230400
menu.UploadSpeed.460800.linux=460800
menu.UploadSpeed.460800.macosx=460800
menu.UploadSpeed.460800.upload.speed=460800
menu.UploadSpeed.512000.windows=512000
menu.UploadSpeed.512000.upload.speed=512000
menu.UploadSpeed.921600=921600
menu.UploadSpeed.921600.upload.speed=921600
menu.FlashSize.4M3M=4M (3M SPIFFS)
menu.FlashSize.4M3M.build.flash_size=4M
menu.FlashSize.4M3M.build.flash_ld=eagle.flash.4m.ld
menu.FlashSize.4M3M.build.spiffs_start=0x100000
menu.FlashSize.4M3M.build.spiffs_end=0x3FB000
menu.FlashSize.4M3M.build.spiffs_blocksize=8192
menu.FlashSize.4M3M.build.spiffs_pagesize=256
menu.FlashSize.4M1M=4M (1M SPIFFS)
menu.FlashSize.4M1M.build.flash_size=4M
menu.FlashSize.4M1M.build.flash_ld=eagle.flash.4m1m.ld
menu.FlashSize.4M1M.build.spiffs_start=0x300000
menu.FlashSize.4M1M.build.spiffs_end=0x3FB000
menu.FlashSize.4M1M.build.spiffs_blocksize=8192
menu.FlashSize.4M1M.build.spiffs_pagesize=256
menu.UploadSpeed.256000=256000
menu.UploadSpeed.512000=512000
runtime.ide.path=C:\Program Files (x86)\Arduino
runtime.os=windows
e\esp8266\2.3.0\system
runtime.ide.version=106012
target_package=esp8266
target_platform=esp8266
dware\esp8266
originalid=nodemcuv2
intellisense.tools.path={compiler.toolchain.path}
a-lx106-elf\4.8.2\include;{runtime.platform.path}\tools\sdk\include
tools.wwwfiles.name=ESP8266 Sketch Data Upload
tools.wwwfiles.ssh=false
tools.wwwfiles.cmd.windows=ESP8266FSUpload.exe
recipe.wwwfiles.upload.pattern="{vm.path}/{tools.wwwfiles.cmd}" -serial.port={serial.port} -build.path="{build.path}" -target_platform="{target_platform}" -runtime.tools.mkspiffs.path="{runtime.tools.mkspiffs.path}" -board.name="{name}" -upload.verbose={upload.verbose} -upload.resetmethod={upload.resetmethod} -upload.speed={upload.speed}  -platform.path="{platform.path}" -project.name="{project.name}" -project.path="{project.path}" -tools.esptool.cmd="{tools.esptool.cmd}" -runtime.tools.esptool.path="{runtime.tools.esptool.path}" -compiler.path="{compiler.path}" -build.spiffs_start="{build.spiffs_start}" -build.spiffs_end="{build.spiffs_end}" -build.spiffs_pagesize="{build.spiffs_pagesize}" -build.spiffs_blocksize="{build.spiffs_blocksize}" -network.password={network.password} -network.auth_upload={network.auth_upload} -network.port={network.port}
tools.wwwfiles.cmd=ESP8266FSUpload.exe
version=2.2.0
compiler.warning_flags=-w
compiler.warning_flags.none=-w
compiler.warning_flags.default=
compiler.warning_flags.more=-Wall
compiler.warning_flags.all=-Wall -Wextra
build.lwip_lib=-llwip_gcc
build.lwip_flags=-DLWIP_OPEN_SRC
compiler.path={runtime.tools.xtensa-lx106-elf-gcc.path}/bin/
compiler.sdk.path={runtime.platform.path}/tools/sdk
compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ "-I{compiler.sdk.path}/include" "-I{compiler.sdk.path}/lwip/include" "-I{build.path}/core"
compiler.c.cmd=xtensa-lx106-elf-gcc
compiler.c.flags=-c {compiler.warning_flags} -Os -g -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals -falign-functions=4 -MMD -std=gnu99 -ffunction-sections -fdata-sections
compiler.S.cmd=xtensa-lx106-elf-gcc
compiler.S.flags=-c -g -x assembler-with-cpp -MMD -mlongcalls
compiler.c.elf.flags=-g {compiler.warning_flags} -Os -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static "-L{compiler.sdk.path}/lib" "-L{compiler.sdk.path}/ld" "-T{build.flash_ld}" -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,register_chipv6_phy
compiler.c.elf.cmd=xtensa-lx106-elf-gcc
compiler.c.elf.libs=-lm -lgcc -lhal -lphy -lpp -lnet80211 -lwpa -lcrypto -lmain -lwps -laxtls -lsmartconfig -lmesh -lwpa2 {build.lwip_lib} -lstdc++
compiler.cpp.cmd=xtensa-lx106-elf-g++
compiler.cpp.flags=-c {compiler.warning_flags} -Os -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD -ffunction-sections -fdata-sections
compiler.as.cmd=xtensa-lx106-elf-as
compiler.ar.cmd=xtensa-lx106-elf-ar
compiler.ar.flags=cru
compiler.elf2hex.cmd=esptool
compiler.elf2hex.flags=
compiler.size.cmd=xtensa-lx106-elf-size
compiler.esptool.cmd=esptool.exe
compiler.esptool.cmd.windows=esptool.exe
build.extra_flags=-DESP8266
compiler.c.extra_flags=
compiler.c.elf.extra_flags=
compiler.S.extra_flags=
compiler.cpp.extra_flags=
compiler.ar.extra_flags=
compiler.objcopy.eep.extra_flags=
compiler.elf2hex.extra_flags=
recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.cpreprocessor.flags} {compiler.c.flags} -DF_CPU={build.f_cpu} {build.lwip_flags} {build.debug_port} {build.debug_level} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} -DARDUINO_BOARD="{build.board}" {compiler.c.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpreprocessor.flags} {compiler.cpp.flags} -DF_CPU={build.f_cpu} {build.lwip_flags} {build.debug_port} {build.debug_level} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} -DARDUINO_BOARD="{build.board}" {compiler.cpp.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
recipe.S.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.cpreprocessor.flags} {compiler.S.flags} -DF_CPU={build.f_cpu} {build.lwip_flags} {build.debug_port} {build.debug_level} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} -DARDUINO_BOARD="{build.board}" {compiler.c.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}"
recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} {compiler.c.elf.extra_flags} -o "{build.path}/{build.project_name}.elf" -Wl,--start-group {object_files} "{build.path}/{archive_file}" {compiler.c.elf.libs} -Wl,--end-group  "-L{build.path}"
« Last Edit: Oct 26th, 2016 at 2:53pm by Tim@Visual Micro »  
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Tim@Visual Micro
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Re: ESP8266: Compiler displays wrong flash size
Reply #1 - Oct 26th, 2016 at 2:52pm
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Hi,

The final program size is worked out using a regex expression and call to esp tools both of which are provided by each hardware definition. So you are right that this is not directly connected to compilation and not a problem.

I have noticed recently that some boards use a slightly different regex method so in some cases the calculation of memory used might not be correct.

However in this case it looks okay. The esp core takes a certain amount of memory which is probably 221,995. The amount of free memory is provided by the esp definition which you can see in the output you have posted. I have highlighted the esp max memory property below and that is what Visual Micro is using to display the "max available". 

When compiling a program for an ESP8266 I get the following output:
      Program size: 221.995 bytes (used 21% of a 1.044.464 byte maximum)
It is an empty program, only an empty setup and an empty loop function is definied.

Board Properties
name=NodeMCU 1.0 (ESP-12E Module)
upload.tool=esptool
upload.speed=115200
upload.resetmethod=nodemcu
upload.maximum_size=1044464
upload.maximum_data_size=81920

You shouldn't worry about how much memory the base esp core takes because it doesn't use more when you, for example, use Serial in your code. Arduino works the opposite way where it starts with very little memory usage but ramps up much faster when you use commands such as Serial.

Does this make sense and answer the question?

Thanks
« Last Edit: Oct 26th, 2016 at 2:55pm by Tim@Visual Micro »  
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Red Baron
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Re: ESP8266: Compiler displays wrong flash size
Reply #2 - Oct 26th, 2016 at 4:14pm
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Hi Tim,

thanks for the fast reponse. In deed, there is currently no problem. Even lager programs rarely have more than 300 KB. 

I found "upload.maximum_size=1044464" at "boards.txt". I think the reason for the problem is there. I tried it with the Arduino IDE, there is the same behavior.

Which program else uses paramter "upload.maximum_size"? Is there any serious problem if a ESP program passes this limit? 

Kind regards
  
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Re: ESP8266: Compiler displays wrong flash size
Reply #3 - Oct 26th, 2016 at 4:31pm
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Sorry I don't know the answer to that. It's best to ask in the sp8266.com forum.

Thanks
  
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