Marcel Stör
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LFS is a way how to execute your Lua code out of ESP8266 flash memory so more RAM is available for variables and data structures. This way large Lua files can be run on ESP8266. There would not be enough RAM to execute such files in a "normal" (out of SPIFFS) way.
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The tutorial assumes that you are able to build a nodemcu-firmware on a Windows 10 host.
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The tutorial assumes that you are able to build a NodeMCU firmware on a Windows 10 host.
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This is a simple step-by-step how to use the LFS feature:
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1. Get and flash LFS enabled firmware
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This is a simple step-by-step recipe how to use the LFS feature.
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Either you get it from [NodeMCU Build](https://nodemcu-build.com/). In the section "LFS options (currently just for dev)" choose the size of the LFS partition (64 KB should be fine). SPIFFS default settings should be fine.
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### Get and flash LFS enabled firmware
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Another possibility is to compile own firmware and enable LFS in [user_config.h](../../app/include/user_config.h), setting `#define LUA_FLASH_STORE 0x10000`. This file includes explanation of how to configure LFS in its comments.
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Get the firmware from [NodeMCU Build](https://nodemcu-build.com/). In the section "LFS options (currently just for dev)" choose the size of the LFS partition (64 KB should be fine). SPIFFS default settings should be fine.
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For details see section [Selecting the firmware](###Selecting-the-firmware) of the LFS documentation.
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Another possibility is to compile your own firmware and enable LFS in [user_config.h](../../app/include/user_config.h), setting `#define LUA_FLASH_STORE 0x10000`. This file includes explanations for how to configure LFS in its comments.
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Flash the firmware to ESP8266.
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For details see section [Selecting the firmware](#selecting-the-firmware) of the LFS documentation below.
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2. Select Lua files to be run from LFS
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[Flash the firmware](flash.md) to ESP8266.
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The easest way is to maintain Lua files of your project in its own directory tree on your host. Project files will be compiled by `luac.cross` to build the LFS image in next step.
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### Select Lua files to be run from LFS
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Nice example is to run telnet and ftp client from LFS. In order to do this put the following files in 1 directory:
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* [lua_examples/lfs/_init.lua](../../lua_examples/lfs/_init.lua)
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* [lua_examples/lfs/dummy_strings.lua](../../lua_examples/lfs/dummy_strings.lua)
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* [lua_examples/telnet/telnet.lua](../../lua_examples/telnet/telnet.lua)
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* [lua_modules/ftp/ftpserver.lua](../../lua_modules/ftp/ftpserver.lua)
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The easiest way is to maintain Lua files of your project in its own directory tree on your host. Project files will be compiled by `luac.cross` to build the LFS image in next step.
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3. Build the LFS image
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A nice example is to run Telnet and FTP servers from LFS. In order to do this put the following files in 1 directory:
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Windows 10 users can use the Windows Subsystem for Linux. From the directory with Lua files from the previous section run `bash` and execute the command (adjust the path as needed):
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```bash
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/mnt/c/GitHub/nodemcu-firmware/luac.cross -f *.lua
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```
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or the following command which includes all Lua files except `init.lua` into LFS image can be used (`init.lua` needs to be in SPIFFS so it does not make sense to include it in the LFS image)
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```bash
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/mnt/c/GitHub/nodemcu-firmware/luac.cross -f `find *.lua -not -name 'init.lua'`
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```
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As a result the `luac.out` file is created.
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* [lua_examples/lfs/_init.lua](../../lua_examples/lfs/_init.lua)
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* [lua_examples/lfs/dummy_strings.lua](../../lua_examples/lfs/dummy_strings.lua)
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* [lua_examples/telnet/telnet.lua](../../lua_examples/telnet/telnet.lua)
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* [lua_modules/ftp/ftpserver.lua](../../lua_modules/ftp/ftpserver.lua)
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4. Upload the LFS image
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### Build the LFS image
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Now it's time to upload the generate LFS image file (`luac.out`) as a normal SPIFFS file. Several tools can be used to upload the files from host to SPIFFS.
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Windows 10 users can use the Windows Subsystem for Linux. From the directory with Lua files from the previous section run `bash` and execute the command (adjust the path as needed):
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One way is to use the [ESPlorer](https://github.com/4refr0nt/ESPlorer) tool, button "Upload...".
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```bash
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/mnt/c/GitHub/nodemcu-firmware/luac.cross -f *.lua
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```
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5. Flash the LFS image to LFS partition
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Or the following command which includes all Lua files except `init.lua` (`init.lua` needs to be in SPIFFS so it does not make sense to include it in the LFS image)
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Run the following command on ESP
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```Lua
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node.flashreload("luac.out")
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```
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The firmware will reboot the ESP8266 and modules will be available after reboot.
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```bash
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/mnt/c/GitHub/nodemcu-firmware/luac.cross -f `find *.lua -not -name 'init.lua'`
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```
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6. Adjust the `init.lua` file
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As a result the `luac.out` file is created.
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`init.lua` is the file that is first executed by the NodeMCU firmware. Usually it setups the wifi connection and executes the main Lua file.
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### Upload the LFS image
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Add the following lines:
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Now upload the generate LFS image file (`luac.out`) as a normal SPIFFS file. Several tools can be used to upload the files from host to SPIFFS.
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```Lua
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-- Execute the LFS init
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node.flashindex("_init")()
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-- Start telnet server
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require("telnet"):open()
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-- Start ftp serer
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require("ftpserver").createServer('user', 'password')
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```
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One way is to use the [ESPlorer](https://github.com/4refr0nt/ESPlorer) tool, button "Upload...".
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### Flash the LFS image to LFS partition
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Run the following command on ESP
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```lua
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node.flashreload("luac.out")
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```
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The firmware will reboot the ESP8266 and modules will be available after reboot.
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### Adjust the `init.lua` file
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`init.lua` is the file that is first executed by the NodeMCU firmware. Usually it setups the wifi connection and executes the main Lua file.
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Add the following lines:
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```lua
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-- Execute the LFS init
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node.flashindex("_init")()
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-- Start Telnet server
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require("telnet"):open()
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-- Start FTP serer
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require("ftpserver").createServer('user', 'password')
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```
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## Background
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@ -33,8 +33,8 @@ pages:
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- Whitepapers:
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- Filesystem on SD card: 'en/sdcard.md'
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- Internal filesystem: 'en/spiffs.md'
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- Lua Compact Debug(LCD): 'en/lcd.md'
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- Lua Flash Store(LFS): 'en/lfs.md'
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- Lua Compact Debug (LCD): 'en/lcd.md'
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- Lua Flash Store (LFS): 'en/lfs.md'
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- Modules:
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- 'adc': 'en/modules/adc.md'
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- 'ads1115' : 'en/modules/ads1115.md'
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