技术

Spi protocol memo

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drivers/spi/spi.c

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spi_write_then_read
 __spi_sync
 
spi_transfer_one_message
 spi_set_cs
 stm32_spi_transfer_one
 
 rspi_dma_transfer
 rspi_pio_transfer

SPI: Serial Peripheral Interface
CS(SS): Chip Select
SCLK: Serial Clock
PTP: Precise Time Protocol

refer to:
https://blog.csdn.net/faihung/article/details/81839825

Minimize memory usage in win10

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Remove all apps,

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#Get-AppxPackage -AllUsers | Remove-AppxPackage

To restore,

dism.exe /online /cleanup-image /scanhealth
dism.exe /online /cleanup-image /restorehealth
dism.exe /online /cleanup-image /startcomponentcleanup
sfc /scannow
 
Get-AppXPackage WindowsStore -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}

Strip off HyperV,

bcdedit /set hypervisorlaunchtype off

Disable realtime protection of Windows Defender, or completely shut it down,

gpedit.msc
	Computer Configuration
		Administrative Templates
			Windows Components
				Microsoft Defender Antivirus
					Turn off Microsoft Defender Antivirus
						Enabled

Turn off Windows Update, from https://blog.csdn.net/milaoshu1020/article/details/115062811

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' switch_win_update_v3.vbs
Const usosvc_reg = "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usosvc"
Set fso = createobject("scripting.filesystemobject")
Set shell = createobject("wscript.shell")
curdir = fso.getparentfoldername(wscript.scriptfullname)
 
If wscript.arguments.count = 0 Then
	Set sh = createobject("shell.application")
	sh.shellexecute wscript.fullname,"""" & wscript.scriptfullname & """ -admin",,"runas"
ElseIf wscript.arguments.count = 1 And wscript.arguments(0) = "-admin" Then
	run
Else
	msgbox "Argument error!"
End If
 
Sub Run()
	Do
		ret = inputbox("0: Turn off Win10 Update;" & vbcrlf & _
						"1: Turn on Win10 Update;" & vbcrlf & _
						vbcrlf & _
						"Input:", "Switch Win10 Update v3","0")
		Select Case ret
		Case "0"
			retnum = shell.run("sc.exe stop usosvc",0,True)
			shell.regwrite usosvc_reg & "\WOW64",&H14c,"REG_DWORD"
			msgbox "Turned Win10 Update off!",vbexclamation
			Exit Do
		Case "1"
			shell.regdelete usosvc_reg & "\WOW64"
			retnum = shell.run("sc.exe start usosvc",0,True)
			msgbox "Turned Win10 Update on!",vbexclamation
			Exit Do
		Case ""
			Exit Do
		Case Else
			msgbox "Input mismatch!",vbcritical
		End Select
	Loop
End Sub

After doing those things, in a machine with 8G memory and an SSD, we can play a 4G memory allocated Win10 LTSC 2019 vmware guest and a 2G ubuntu20 one in a silky manner.

refer to:
http://www.xitongcheng.com/jiaocheng/win10_article_42055.html
https://www.bilibili.com/read/cv4183745

Awtk memo

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Download node-v16.14.0-x64.msi from
https://nodejs.org/en/
or for win7 is
https://nodejs.org/download/release/v13.6.0
install it in Adminstrator cmd console.

Official repository:
https://github.com/zlgopen/awtk

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python -m pip install pywin32
python -m pip install scons
 
cd awtk-master
scons
bin\demoui

Debug after attach demoui.exe,

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awtk-master\demos\demo_ui_app.c
 application_init
  WIDGET_FOR_EACH_CHILD_BEGIN(window_manager(), root, i)
   init_children_widget(root, (void*)win)
    widget_foreach(widget, init_widget, ctx)
     widget_on(widget, EVT_CLICK, on_menu_bar_open, win)
      on_menu_bar_open
       open_menu_bar
 
label_paint_text
 widget_draw_text_in_rect
 
window_create
 edit_create
 button_create
 label_create
  widget_set_text
window_close
dialog_create_simple
 dialog_set_title

Ui and style,

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#doc/theme.md
bin/themegen input.xml output.bin -
 
#doc/ui_desc.md
bin/preview_ui demos/assets/raw/ui/main.xml
bin/xml_to_ui window1.xml window1.data
#include "res/ui/window1.data"
assets_manager_add((const asset_info_t*)ui_window1);
widget_t* win = window_open(name);

Message box,

Read more

Disable features in cmake command line

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Identical to "./configure --help", when a project uses cmake, we get building instructions like below,

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mkdir bld
cd bld
cmake ..
cmake . -L

wait a while we will see all the variables cmake defined in cache.

Or directly look into CMakeCache.txt.

If we want to modify a variable to off, or say, disable some functionality,

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FEATURE_test_name:BOOL=ON

we run cmake once again like this,

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cmake -DFEATURE_test_name:BOOL=OFF ..

refer to:
https://www.oschina.net/question/231677_45266

Build qt source in Fedora35

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Extract qt-everywhere-src-6.2.2.zip to directory named qt,

sudo dnf install libxcb libxcb-devel xcb-util xcb-util-devel xcb-util-*-devel libX11-devel libXrender-devel libxkbcommon-devel libxkbcommon-x11-devel libXi-devel libdrm-devel libXcursor-devel libXcomposite-devel

cd qt
mkdir bld
cd bld
cmake -G Ninja -DCMAKE_INSTALL_PREFIX:PATH=`pwd`/installed -DCMAKE_BUILD_TYPE="Debug" ..
cmake --build . --parallel
cmake --install . --prefix=`pwd`/installed

Can't locate English.pm in @INC

sudo dnf install perl-English

This application failed to start because no Qt platform plugin could be init...

If "xcb" things missing, we should "dnf install libxcb..." like above, and an annoying step we can't image is after we install required packages, we must delete CMakeCache.txt first and then to invoke cmake, if not, some modules like xcb-sm are always displayed not to be built.

Feature accessibility_atspi_bridge is already defined to be "OFF" and should now be set to "ON" when importing features from Qt6::Gui.

We only need to not let the message interrupt building progress,

/mnt/SDC2/qt/bld/installed/lib/cmake/Qt6/QtFeature.cmake:1136

	message(STATUS "Feature ${feature} is already defined to be \"${QT_FEATURE_${feature}}\" and should now be set to \"${value}\" when importing features from ${target}.")

refer to:
https://download.qt.io/official_releases/qtcreator/6.0/6.0.1/qt-creator-opensource-linux-x86_64-6.0.1.run
https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11
https://forum.qt.io/topic/121386/built-qt6-from-sources-problem-with-xcb-plugin/15
https://forum.qt.io/topic/128887/build-qt6-from-source-xcb-issue/3
https://forum.qt.io/topic/92834/configure-errors-disabling-x11-accessibility-bridge-d-bus-or-at-spi-is-missing/7

Debug ue4 in Fedora35

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After running Setup.sh and GenerateProjectFiles.sh, we found UE4.pro created. It's like a fresh breeze coming from the roof window, we are free now, no more need to fear the once unbearable torment in Visual Studio IDE.

Qt source is not necessary to ue4, qtcreator is only a visual debugger to ue4.

Build Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug -j8

Clean Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug ARGS=-clean -j8

refer to:
https://docs.unrealengine.com/4.27/en-US/SharingAndReleasing/Linux/BeginnerLinuxDeveloper/SettingUpQtCreator/

Build qemu in Fedora35

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Build,

sudo dnf install ninja-build pixman-devel

cd qemu-6.2.0
mkdir bld
cd bld
../configure --enable-kvm --target-list=x86_64-softmmu --prefix=`pwd`/installed
make

Inspect through vnc,

dnf install vinagre

cd x86_64-softmmu
./qemu-system-x86_64 -m 3500 -smp 4 --enable-kvm -boot d -hda /mnt/DATA/vmimg/win7/win7.vmdk

Open vinagre, input "127.0.0.1:5900" in VNC host box, then connect, after a while we will see win7 running up.

Run in local gui,

sudo dnf install libepoxy-devel gtk3-devel

cd bld
../configure --enable-kvm --enable-gtk --enable-opengl --target-list=x86_64-softmmu --prefix=`pwd`/installed

cd x86_64-softmmu
./qemu-system-x86_64 -m 3500 -smp 4 --enable-kvm -display gtk,gl=on -vga vmware -usb -device usb-kbd -device usb-audio -boot c -netdev user,id=mynet0 -device e1000-82545em,netdev=mynet0 -boot d -hda /mnt/DATA/vmimg/win7/win7.vmdk

Frankly, qemu gui is not user friendly, and I have not found the way to setup 3d presentation in guest win7 yet.

refer to:
https://blog.csdn.net/haifeng_gu/article/details/108055083
https://blog.csdn.net/wanghuiyao/article/details/65627198

Build virtualbox in Ubuntu

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Similar to in Fedora35, total difference is in from apt or from yum.

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sudo apt-get install acpica-tools chrpath doxygen g++-multilib libasound2-dev libcap-dev \
        libcurl4-openssl-dev libdevmapper-dev libidl-dev libopus-dev libpam0g-dev \
        libpulse-dev libqt5opengl5-dev libqt5x11extras5-dev qttools5-dev libsdl1.2-dev libsdl-ttf2.0-dev \
        libssl-dev libvpx-dev libxcursor-dev libxinerama-dev libxml2-dev libxml2-utils \
        libxmu-dev libxrandr-dev make nasm python3-dev qttools5-dev-tools \
        unzip xsltproc glslang-dev glslang-tools \
        libstdc++5 libxslt1-dev linux-kernel-headers makeself \
        mesa-common-dev subversion yasm zlib1g-dev

refer to:
build virtualbox in fedora35

Fedora kernel: bad shim signature

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One easy method is disabling Secure Boot option in machine EFI BIOS.

In other way, we can't sign vmlinuz using MOK, because MOK is only a gate keeper for kernel after vmlinuz booting up, and if we want EFI firmware to admit vmlinuz as descendant, we must require the machine manufacturer to sign the vmlinuz we built.

MOK: Machine Owner Key
UEFI: Unified Extensible Firmware Interface

refer to:
https://www.rodsbooks.com/efi-bootloaders/secureboot.html

Re-compress all Mame zip roms to 7z format

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In advance,

trans_to_7z.sh

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#!/bin/bash
 
PARENTDIR=$1
TMPDIR=`pwd`/tmp
 
PATH="/d/cext/Program Files/7-Zip:$PATH"
 
ISERR="no"
 
if [ "x$1" = x ] ; then
	echo "Please input dir to transform."
	exit
fi
 
if [ -e "$TMPDIR" ] ; then
	echo "Please rmdir [$TMPDIR] first."
	exit
fi
 
get_win_path()
{
	local win_path="$1"
	win_path="${win_path#/}"
	win_path="${win_path//\//\\}"
	win_path="${win_path/\\/\:\\}"
	echo $win_path
}
 
format_transform()
{
	local file_7z=$1
	local file_zip=$2
	local tmp_dir=$TMPDIR
	mkdir "$tmp_dir"
 
	7z x ${file_7z} -o"`get_win_path \"$tmp_dir\"`"
	(
		cd "$tmp_dir"
		ls
 
		7z a -mx9 "`get_win_path \"${file_zip}\"`" || ( echo "Creating 7z file failed." && ISERR="yes" )
	)
 
	rm -Rf "$tmp_dir"
}
 
cd "$PARENTDIR"
 
for fn in `ls *.zip`; do
 
	echo "$fn"
 
	format_transform $fn "`pwd`/${fn%.zip}.7z"
 
	if [ $ISERR = "yes" ]; then
		exit
	fi
done
 
echo "Transforming done."

How to use?

Copy trans_to_7z.sh to Mame root folder which contains roms sub-directory, right click at blank place of this Mame root window in Explorer, select "Git Bash Here" which prompts bash console, input below and return,

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./trans_to_7z.sh roms

refer to:
https://www.cnblogs.com/wq242424/p/15564203.html