micropython/esp8266/modules/_boot.py

import gc
gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)
import uos
from flashbdev import bdev

try:
    if bdev:
        uos.mount(bdev, '/')
except OSError:
    import inisetup
    vfs = inisetup.setup()

gc.collect()
esp8266: Explicitly collect garbage in bootstrap scripts. Leads to less fragmentation at teh time user code starts. 2016-07-03 00:20:13 +08:00			`import gc`
esp8266/_boot.py: Decrease GC alloc threshold to quarter of heap size. The idea behind decrease is: bytecode and other static data is also kept on heap, and can easily become half of heap, then setting threshold to half of heap will have null effect - GC will happen on complete heap exhaustion like before. But exactly in such config maintaining heap defragmented is very important, so lower threshold to accommodate that. 2016-07-23 18:56:24 +08:00			`gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)`
esp8266: Add Python modules for initial configuration. Main entry point is _boot.py which checks whether FAT FS in flash mountable, and if so, mounts it. Otherwise, it checks if flash is empty, and if so, performs initial module setup: makes FAT FS, configures default AP name, etc. As a last option, if flash is not empty, and could not be mounted, it means filesystem corruption, and warning message with instructions is printed in an infinite loop. 2016-04-12 05:37:04 +08:00			`import uos`
			`from flashbdev import bdev`

			`try:`
esp8266/scripts: Don't try to create filesystem on 512KB devices or less. There's no space for it. 2016-04-18 22:14:00 +08:00			`if bdev:`
esp8266: Change default settings to mount flash at root dir. 2017-03-10 14:14:21 +08:00			`uos.mount(bdev, '/')`
esp8266: Add Python modules for initial configuration. Main entry point is _boot.py which checks whether FAT FS in flash mountable, and if so, mounts it. Otherwise, it checks if flash is empty, and if so, performs initial module setup: makes FAT FS, configures default AP name, etc. As a last option, if flash is not empty, and could not be mounted, it means filesystem corruption, and warning message with instructions is printed in an infinite loop. 2016-04-12 05:37:04 +08:00			`except OSError:`
			`import inisetup`
esp8266/scripts: Move all of initial setup to inisetup module. 2016-04-30 01:02:59 +08:00			`vfs = inisetup.setup()`
esp8266: Explicitly collect garbage in bootstrap scripts. Leads to less fragmentation at teh time user code starts. 2016-07-03 00:20:13 +08:00
			`gc.collect()`