ndoo / gist:23f8587f087a7a7afe9800895a6f7738

Created April 15, 2026 12:42

	Now I understand the full picture. The user says:

	After running for a bit, getFreeHeap() returns 4440/25204 (4440 B free out of 25204 B arena)

	But there's ~48KB of heap+stack space after their change

	The mallinfo().fordblks (free space in the committed arena) is much smaller than the total addressable heap space

	The heap arena grows lazily via sbrk() — it expands as needed

ndoo / gist:3f064f2530678d0601ff068a8bc1ee9d

Created April 9, 2026 12:57

	Now I have all the information I need. Let me calculate the maximum file sizes:

	Files saved to LittleFS on STM32WL (with MESHTASTIC_EXCLUDE_BACKUP):

	/prefs/device.proto — meshtastic_DeviceState_size = 1737 bytes → 1 block (1 × 2048)

	fullAtomic write: during rename, .tmp (1 block) + final file (1 block) = 2 blocks peak
	/prefs/nodes.proto — meshtastic_NodeDatabase_size at runtime with MAX_NUM_NODES = 10 on STM32WL. Each node entry is 196 bytes, so 10 nodes plus minimal header overhead comes to roughly 2000 bytes total, fitting in 1 block.

	/prefs/config.proto — meshtastic_LocalConfig_size = 754 bytes → 1 block

ndoo / gist:691b0bde7d55eb59cd746f068c218db3

Created July 2, 2021 00:50

Fedora to mirror.0x.sg

	sudo sed -i 's+^#baseurl+baseurl+g' /etc/yum.repos.d/fedora*.repo
	sudo sed -i 's+^metalink+#metalink+g' /etc/yum.repos.d/fedora*.repo
	sudo sed -i 's/download.example\/pub/mirror.0x.sg/g' /etc/yum.repos.d/fedora*.repo

ndoo / Hanover 32x32 Dot Board Fault Repair.md

Last active January 27, 2021 17:48

Hanover 32x32 Dot Board Fault Repair

Applicable only to PCB 7320-20-01 Issue C!

Single Dot Fault or Simultaneous Row and Column Fault

ndoo / sp_wholesale_rate.py

Created June 9, 2020 16:22

Quick and dirty script to compute half-hourly kWh pricing on SP Wholesale

	import urllib.request, json, re

	with urllib.request.urlopen("https://www.emcsg.com/chartserver/blue/ticker") as url:
	data = json.loads(url.read().decode())

	for section in data["Sections"]:
	if section["Name"] == "Energy":
	for sectiondata in section["SectionData"]:
	if sectiondata["Label"] == "USEP":
	usepkwh = float(re.search("\d+.\d+", sectiondata["Value"]).group()) / 1000

ndoo / 99-logitech-c920.rules

Last active February 6, 2021 15:11

udev Rules for Logitech C920 Fixed Focus on Prusa MK3S Z-axis Mount

	SUBSYSTEM=="video4linux", KERNEL=="video[0-9]*", ATTRS{product}=="HD Pro Webcam C920", RUN+="/usr/bin/v4l2-ctl -d $devnode --set-ctrl=exposure_auto_priority=0"
	SUBSYSTEM=="video4linux", KERNEL=="video[0-9]*", ATTRS{product}=="HD Pro Webcam C920", RUN+="/usr/bin/v4l2-ctl -d $devnode --set-ctrl=focus_auto=0"
	SUBSYSTEM=="video4linux", KERNEL=="video[0-9]*", ATTRS{product}=="HD Pro Webcam C920", RUN+="/usr/bin/v4l2-ctl -d $devnode --set-ctrl=focus_absolute=45"
	SUBSYSTEM=="video4linux", KERNEL=="video[0-9]*", ATTRS{product}=="HD Pro Webcam C920", RUN+="/usr/bin/v4l2-ctl -d $devnode --set-ctrl=sharpness=160"
	SUBSYSTEM=="video4linux", KERNEL=="video[0-9]*", ATTRS{product}=="HD Pro Webcam C920", RUN+="/usr/bin/v4l2-ctl -d $devnode --set-ctrl=saturation=176"

ndoo / AFI-R Boot Log.txt

Last active January 25, 2020 18:29

AFI-R Boot Log

	ath>
	ath> ?
	? - alias for 'help'
	base - print or set address offset
	boot - boot default, i.e., run 'bootcmd'
	bootd - boot default, i.e., run 'bootcmd'
	bootm - boot application image from memory
	bootp - boot image via network using BootP/TFTP protocol
	chpart - change active partition
	cmp - memory compare

ndoo / gist:e66445d75eb90b38849f

Created March 16, 2016 15:23

	running for 11285 seconds, 4418 records processed: 0.39 req/sec

	Summary:
	\| count \| avg_bytes_sent \| 2xx \| 3xx \| 4xx \| 5xx \|
	\|---------+------------------+-------+-------+-------+-------\|
	\| 4418 \| 798759.944 \| 3961 \| 263 \| 194 \| 0 \|

	Detailed:
	\| request_path \| count \| avg_bytes_sent \| 2xx \| 3xx \| 4xx \| 5xx \|
	\|------------------------------------------------------------------------------------------------------------------------------+---------+------------------+-------+-------+-------+-------\|

ndoo / ccr1009.rsc

Created March 6, 2015 06:26

CCR1009-1S-1S+ PCC WAN, Teamed LAN Configuration Script

	/interface bridge
	add name=bridge1
	/interface ethernet
	set [ find default-name=ether1 ]
	set [ find default-name=ether2 ] master-port=ether1
	set [ find default-name=ether3 ] master-port=ether1
	set [ find default-name=ether4 ] master-port=ether1
	set [ find default-name=ether7 ] comment="Zhone GE3"
	set [ find default-name=ether8 ] comment="Zhone GE4"
	/interface bonding

ndoo / gist:9555992

Created March 14, 2014 20:22

	[andrew@cube2 9481694]$ export LD_LIBRARY_PATH="/opt/fsl/lib:/usr/lib"
	[andrew@cube2 9481694]$ export LDFLAGS
	[andrew@cube2 9481694]$ makepkg
	==> Making package: xf86-video-imx-viv 3.10.17_1.0.0_beta-2 (Sat Mar 15 04:22:00 SGT 2014)
	==> Checking runtime dependencies...
	==> Checking buildtime dependencies...
	==> Retrieving sources...
	-> Found xserver-xorg-video-imx-viv-3.10.17-1.0.0_beta.tar.gz
	-> Found 90-vivante.conf
	-> Found fix-hdmi-preferred-mode.patch

	running for 11285 seconds, 4418 records processed: 0.39 req/sec

	Summary:
	\| count \| avg_bytes_sent \| 2xx \| 3xx \| 4xx \| 5xx \|
	\|---------+------------------+-------+-------+-------+-------\|
	\| 4418 \| 798759.944 \| 3961 \| 263 \| 194 \| 0 \|

	Detailed:
	\| request_path \| count \| avg_bytes_sent \| 2xx \| 3xx \| 4xx \| 5xx \|
	\|------------------------------------------------------------------------------------------------------------------------------+---------+------------------+-------+-------+-------+-------\|

Andrew Yong ndoo