84 lines
3.2 KiB
Lua
84 lines
3.2 KiB
Lua
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--
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-- File: _init.lua
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--[[
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This is a template for the LFS equivalent of the SPIFFS init.lua.
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It is a good idea to such an _init.lua module to your LFS and do most of the LFS
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module related initialisaion in this. This example uses standard Lua features to
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simplify the LFS API.
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The first section adds a 'LFS' table to _G and uses the __index metamethod to
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resolve functions in the LFS, so you can execute the main function of module
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'fred' by executing LFS.fred(params), etc. It also implements some standard
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readonly properties:
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LFS._time The Unix Timestamp when the luac.cross was executed. This can be
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used as a version identifier.
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LFS._config This returns a table of useful configuration parameters, hence
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print (("0x%6x"):format(LFS._config.lfs_base))
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gives you the parameter to use in the luac.cross -a option.
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LFS._list This returns a table of the LFS modules, hence
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print(table.concat(LFS._list),'\n')
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gives you a single column listing of all modules in the LFS.
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---------------------------------------------------------------------------------]]
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local index = node.flashindex
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local lfs_t = {
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__index = function(_, name)
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local fn_ut, ba, ma, size, modules = index(name)
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if not ba then
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return fn_ut
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elseif name == '_time' then
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return fn_ut
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elseif name == '_config' then
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local fs_ma, fs_size = file.fscfg()
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return {lfs_base = ba, lfs_mapped = ma, lfs_size = size,
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fs_mapped = fs_ma, fs_size = fs_size}
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elseif name == '_list' then
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return modules
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else
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return nil
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end
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end,
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__newindex = function(_, name, value)
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error("LFS is readonly. Invalid write to LFS." .. name, 2)
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end,
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}
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local G=getfenv()
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G.LFS = setmetatable(lfs_t,lfs_t)
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--[[-------------------------------------------------------------------------------
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The second section adds the LFS to the require searchlist, so that you can
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require a Lua module 'jean' in the LFS by simply doing require "jean". However
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note that this is at the search entry following the FS searcher, so if you also
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have jean.lc or jean.lua in SPIFFS, then this SPIFFS version will get loaded into
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RAM instead of using. (Useful, for development).
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Note that if you want LFS to take a higher priority than SPIFFS, the use the [2]
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slot for loaders. If you want to reverse these in your init.lua or interactively
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for debugging, then use
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do local pl = package.loaders; pl[2],pl[4] = pl[4],pl[2]; end
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---------------------------------------------------------------------------------]]
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package.loaders[4] = function(module) -- loader_flash
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local fn, ba = index(module)
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return ba and "Module not in LFS" or fn
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end
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--[[-------------------------------------------------------------------------------
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You can add any other initialisation here, for example a couple of the globals
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are never used, so setting them to nil saves a couple of global entries
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---------------------------------------------------------------------------------]]
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G.module = nil -- disable Lua 5.0 style modules to save RAM
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package.seeall = nil
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