====== Programmierung ======
in diesem Abschnitt habe ich ein paar von mir häufig verwendete Code-Schnipsel hinterlegt. vielleicht ist der eine oder andere hilfreich ;)

[[.:git:start|GIT]] [[.:svn:start|SVN]]

[[.:bash]]

[[.:javascript]]

[[.:mysql]]

[[.:python:start|Python]]

[[.:php|PHP]]

[[.:vscode|VSCode]]
===== Batch =====
===== C/C++ =====

==== Makefile ====

  $(warning $$src is [${src}])

string-manipulation:

https://ftp.gnu.org/old-gnu/Manuals/make-3.79.1/html_chapter/make_8.html#SEC77
==== Linux ====

=== Fixes (für backports) ===

  Cc: stable@vger.kernel.org

in den Signed-Off-Bereich

Quelle: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

=== debugging ===

== Using dynamic debug ==

Add options:
  
  CONFIG_DYNAMIC_DEBUG=y
  CONFIG_DEBUG_FS=y

And enable it from userspace (here all for network drivers):

  echo "file drivers/net/* +p"> /sys/kernel/debug/dynamic_debug/control    

== Manual by adding new messages ==

  printk(KERN_ALERT "DEBUG: Passed %s %d val:0x%0x\n",__FUNCTION__,__LINE__,(unsigned int)val);

  dev_err(dev,"DEBUG: Passed %s %d val:0x%x\n",__FUNCTION__,__LINE__,val);


=== cmdline ===

<code>
//register params
static int startreg=-1;
module_param( startreg, int, S_IRUGO );
static int regcount=10;
module_param( regcount, int, S_IRUGO );

//look for module-name
static struct mdio_driver realtek_mdio_driver = {
	.mdiodrv.driver = {
		.name = "realtek-mdio",//<<<<

//pass cmdline arguments
realtek-mdio.startreg=0x1300 realtek-mdio.regcount=50
</code>

  * http://embeddedguruji.blogspot.com/2018/12/passing-parameters-to-linux-device.html
  * https://ezs.kr.hsnr.de/TreiberBuch/html/sec.treiberparam.html

=== Links ===

  * [[https://elixir.bootlin.com/linux/latest/source|elixir@bootlin]]
  * Patchwork
    * [[https://patchwork.kernel.org/project/linux-mediatek/list/|Mediatek]]
    * [[https://patchwork.kernel.org/project/linux-rockchip/list/|Rockchip]]
    * [[https://patchwork.ozlabs.org/project/devicetree-bindings/list/|dt-bindings]]
  * GIT:
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/refs/|stable]] [[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/|torvalds]] [[https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/|linux-next]]
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/log/|net]] [[https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/log/|net-next]]
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next|drm mtk next]][[https://cgit.freedesktop.org/drm/drm/log/|drm]]
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/mediatek/linux.git|neues mediatek repo]] ([[https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/log/?h=for-next|altes mtk dts next]])
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git|Rockchip SoC/DTS]]
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git|dt-bindings]]
    * [[https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/log/?h=for-next|pinctrl-next]]

==== U-Boot ====

=== debugging ===

  #define DEBUG 1

vor "#include <common.h>" um vorhandene/zusätzliche debug() anzuzeigen

  debug("## %s:%d...\n", __FILE__,__LINE__);

oder manuell (wird immer angezeigt):

  printf("%s:%d val:0x%0x\n",__FUNCTION__,__LINE__,(u32)val);

=== Links ===

  * [[https://elixir.bootlin.com/u-boot/latest/source|elixir@bootlin]]
  * [[https://patchwork.ozlabs.org/project/uboot/list/|Uboot-Patchwork]] [[https://lists.denx.de/pipermail/u-boot/|Mailinglist Archiv]]
  * [[https://gitlab.denx.de/u-boot/u-boot|uboot gitlab]]


==== DTC ====

http://thesoulofamachine.blogspot.com/2016/07/linux-dts-compilation-using-dtc-compiler.html

DTB dekompilieren:

  sudo apt-get install device-tree-compiler

  dtc -I dtb -O dts sun8i-h3-orangepi-pc.dtb -o /tmp/tmp.dts 
  less /tmp/tmp.dts
  
  #Alternative ohne temporäre Datei
  dtc -I dtb -O dts ../build/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dtb | less
  
  #aus sysfs
  dtc -I fs -O dts /sys/firmware/devicetree/base | less

=== dtbs_check ===

  sudo apt install swig yamllint

  pip3 install dtschema --upgrade
  pip3 show dtschema

  ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/ata/ahci-platform.yaml
  ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make defconfig #dtbs_check need kernel-config
  ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/ata/ahci-platform.yaml
  ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make multi_v7_defconfig
  ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/ata/ahci-platform.yaml
  
  #maybe need to add dir to path
  PATH=$PATH:~/.local/bin

=== DTS ===

Mapping wifi Eeprom data to pcie slot:

https://forum.banana-pi.org/t/802-11ac-module-gives-max-6dbi-transmitter-power/14238/23

===== CSS =====

===== HTML =====