COM Object and C++

Published on 2022-07-31 in Windows
• CoInitialize: Initializes the COM library for use by the calling thread, sets the thread’s concurrency model, and creates a new apartment
• CoInitializeEx: More advanced version CoInitialize that specify the thread’s concurrency model
• CoUninitialize: Should be called on deconstructor

And Bash Is Awesome!!!

Published on 2022-07-08 in Linux, Uncategorized

Here I list cool bash tricks I learned:

Bash Heredoc

Chrome DevTools Remote Control in Linux Bash

Published on 2022-05-06 in Linux

Ok the title is a bit long but why google create such a nice debug interface and make it so difficult to access it.

1. open chrome with remote debug enabled

chromium --remote-debugging-port=9222

2. Install websocat to create websocket to chrome

sudo pacman -S websocat

3. Find magic chrome ws url. To do that visit following url

4. Connect to the websocket

websocat ws://<GUID>

5. Execute magic command. Here just scrolling the page

{"id": 1, "method": "Runtime.evaluate", "params": {"expression": "document.documentElement.scrollTop = 600"}}

Few Notes

WDM, WDK, DDK, HDK, SDK and ….

Published on 2021-05-21 in Windows

On the way to develop a driver for Scarlet Solo Gen3 to harness the power of Shure SM57 Dynamic Microphone.

Useful links to preserve:

  1. Microsoft – Universal Audio Architecture: Guideline to for Sound Card Without Propriety Driver

  2. Microsoft – Introduction to Port Class

  3. Microsoft – AVStream Overview
  4. Microsoft – WDM Audio Terminology

  5. Microsoft – Kernel Streaming
  6. Microsoft – KS Filters

Update 1: Finished developing! Here is the link to the released driver

GitHub – BijanBina/BAudio Windows 7 x64

ZC702 FMCOMMS3 PetaLinux Starting Guide

Published on 2019-07-08 in Electrical Engineering, Linux, Xlinx

The combination of FMCOMMS3 and PetaLinux is working only on Ubuntu 16.04 LTS, PetaLinux 2018.3, Vivado 2018.3

Required Packages:

sudo apt-get install -y gcc git make net-tools libncurses5-dev tftpd zlib1g-dev libssl-dev flex bison libselinux1 gnupg wget diffstat chrpath socat xterm autoconf libtool tar unzip texinfo zlib1g-dev gcc-multilib build-essential libsdl1.2-dev libglib2.0-dev zlib1g:i386 screen pax gzip

Installing PetaLinux

Create a new directory

sudo mkdir -m 755 PetaLinux 
sudo chown bijan ./PetaLinux

Install PetaLinux by running the following command.

./ .

Building Vivado Project

Clone Analog Devices HDL repository

git clone
git clone

Make HDL Project

export PATH="$PATH:/mnt/hdd1/Vivado/Vivado/2018.3/bin"
make fmcomms2.zc702

Creating a New PetaLinux Project:

source ../
petalinux-create --type project --template zynq --name fmcomms3_linux

Then change directory to the created project directory.

petalinux-config --get-hw-description=<hdf file directory>

set Subsystem AUTO Hardware Settings -> Advanced bootable
images storage setting -> u-boot env partition settings -> image
storage media -> primary sd


Download following files and write it down to meta-adi/meta-adi-xilinx/recipes-bsp/device-tree/files




Build PetaLinux:

To build petalinux run following command inside petalinux directory


In case of error remove -e from first line of system-user.dtsi file inside build/tmp/work/plnx_zynq7-xilinx-linux-gnueabi/device-tree/xilinx+gitAUTOINC+b7466bbeee-r0/system-user.dtsi

Program ZC-702 FPGA Board Through JTAG

Install Digilent Drivers

<Vivado Install Dir>/data/xicom/cable_drivers/lin64/install_script/install_drivers/install_drivers

To program the board using jtag interface. First we should package the kernel with the following command.

petalinux-package --boot --fsbl images/linux/zynq_fsbl.elf --fpga images/linux/system.bit --u-boot --force

Then login to the root account and run following commands.

petalinux-package --prebuilt --fpga images/linux/system.bit --force
petalinux-boot --jtag --prebuilt 3 -v
petalinux-boot --jtag --fpga --bitstream images/linux/system.bit

Program ZC-702 FPGA Board Through SD-Card

Enable SW16.3 & SW16.4 on ZC702 Board.

Generate BOOT.BIN file by executing following command:

petalinux-package --boot --fsbl images/linux/zynq_fsbl.elf --fpga images/linux/system.bit --u-boot --force

copy image.ub and BOOT.BIN to SD-Card

Customize Username and Password

To change username and password open


Change analog to your desired password. If you want to remove login requirement comment EXTRA_USERS_PARAMS and enable debug-tweak in petalinux-config -c rootfs.

Change UART BaudRate

To change UART baudrate run


go to Subsystem AUTO Hardware Settings -> Serial Settings -> System stdin/stdout baudrate

Useful Links

Analog Wiki – Building with Petalinux

Analog Wiki – HDL Releases

GitHub – Analog Device No OS

AHK Binding not Works on All Application

Published on 2017-08-28 in Windows

I use AutoHotkey  in almost all my application but I notice some Qt applications (Like ADS) had some difficulty interpreting the AHK keys correctly. The problem turns out to be affiliated with UAC and Admin rights rather than the Qt library. To solve the issue simply add following lines to the top of your AHK scripts that you want to be applied on the specific app.

#SingleInstance Force
SetWorkingDir %A_ScriptDir%
if not A_IsAdmin
   Run *RunAs "%A_ScriptFullPath%" ; Run Script as admin

This problem arises when you open a software instance with the admin rights while the AHK script doesn’t spawn with the same permission level. The above script simply run AHK with admin rights too so whether application is with or without admin right AHK script will always be able to set the key bindings.

Team Solid Squad

Evdev Wheel Emulation by keyboard

Published on 2017-05-27 in Linux

One of the great feature of XInput is “Mouse Wheel Emulation” that I graceful with it for more than 5 years. Lately I notice it relieve my hand If I could trig wheel emulation by a key on keyboard instead of a mouse button.

Unfortunately up to this time Evdev not support that and pushing a mouse button through a synthetic way (like using bash script or liunx API) won’t trick EvDev. The reason behind this is that Evdev Wheel Emulation is a device specific driver. you won’t be able to enable it on all devices so it only executed if a button is pressed only on the specific device that you enable emulation on . Moreover after the triggering, wheel emulation only apply to movement of this specific devices with trigger. The figure below show two scenario that lead to unsuccessful wheel emulation.


In a nutshell if you press mouse button source from a bash script emulation not work because EvDev driver won’t get it at all thus the button press have to come from a event-based device and not a complete virtual software. Additionally the movement and button press should come from same device. So as shown in the image, movement on Mouse #1 won’t do the emulation triggered from Mouse #2. To recap:

  1. The button press should come from an event-based device
  2. Trigger and movement should be on same device

Solution: Uinput-Mapper

Uinput is a kernel module to create event-based device. Uinput-Mapper is a wrapper around uinput in python that can create duplicate from a physical device and then manipulate it. Unfortunately python and Uinput-Mapper are slow and that can cause unexpected lag on mouse movement so the idea in here is to only use Uinput-Mapper under necessary cicumstances.

Uinput-Mapper can be cloned from this github repositories. If you get a glimpse of uinput-mapper, you notice two files input-read and input-create. input-read is a python script that read all event from a event-based device and spit all events out  in form of pickle to stdout. For those who like me that don’t know what pickle is, pickle is a saving format. It can save and restore any type of variable so with power of pickle you can save a complex class and restor all variables and function in the state that it had been saved before.

Now what is input-create? input-create is twin of input-read that first create a event-base device and then get all event from stdin in form of pickle and then execut the events on a virtual device that has been just created by the script. To summerize input-read capture all events from an actual device and convert it to pickle, and then input create duplicate device and execute captured events coming from input-read.

So you had to pipeline all output of input read to input-create with something like command shown below

$ ./input-read -D /dev/input/event3 | ./input-create

The -D option in above command imply that input-read output is in format of pickle(not in a human readable format).

Keycode Based Shortcut Trigger

Now the time hase come to manipulate uinput-mapper to our requiment. I think posting all codes in here will clutter the post structure so I explain basic of modification applied on uinput-mapper and leave all codes to my github Bijoux repository.

First we need a script to trigger on pressing a key on keyboard. For sake of simplicity and because of my extra experience with bash I use bash over python to do the key detection and then used stdio to pass it to input-read. The big picture here is first using input-mapper we create a duplicate of our physical mouse. How? by running exact command mentioned above. Then we disable the physical mouse in XInput by running

$ xinput disable $MOUSE_ID

Now instead of data passing directly to EvDev, it pipelined through synthetic event-base device and then pass to EvDev. Here the trick is to write a script (we call it shortcut from now on) to detect a shortcut and then when a shortcut is detected we inject a synthetic event into virtual mouse that we have been created previously. Now from EvDev perspective, this won’t be any different from the event Physical Mouse #1 generate so it trigger the emulation wheel and moving in x/y direction actually scroll the screen on the active window. The figure below demostrate the forgoing concept.



shortcut script detect a key press -> send a notification to input-read -> input-read load a previously recorded button press -> send recorded event to uinput-create -> uinput-create execute synthethic event as the same as other event come from mouse #1 -> …

Performance Issue

As remark previously, python scripts are slow intrinsically passing all mouse events through it cannot be accepted from performance point of view. Furthuremore in my brief test script runtime speed create not dramatic but noticable lag on mouse movement. To solve this issue bridge solution described above should only applied if and only if the wheel emulation should excute on that time. To do that following vivid shortcut (script) clears how this can be done.

The script is nothing more than a program than switch between physical mouse and virtual mouse on the fly. This is accomplished by using enable/disable function of XInput


MOUSE_ID=($(xinput list | grep -m 1 MOUSE_MODEL | awk -F "=" '{print $2}' | awk -F " " '{print $1}'))

while read -r line
    #echo $line
	if [ "$line" == "key press   108" ];then
		echo 1 #inform input-read
		xinput disable $MOUSE_ID
		xinput enable $VIRTUAL_ID
		while read -r line
			if [ "$line" == "key release 108" ];then
				echo 0 #inform input-read
				xinput enable $MOUSE_ID
				xinput disable $VIRTUAL_ID
		done < <(xinput test 12)
done < <(xinput test 12)

Deploy Qt/QML on Windows

Published on 2017-03-03 in Linux

To deploy qt application or harder QML app you need a tool called windeployqt availible in C:\Qt\Qt5.7.0\5.7\mingw53_32\bin or something like that. To get start open a cmd there and add QtBin path to your enviroment PATH variable.

$set PATH=%PATH%;C:\Qt\Qt5.7.0\5.7\mingw53_32\bin

run following

$windeployqt --qmldir I:\Home\Projects\AllegroAss\UI I:\Home\Projects\AllegroAss\Sources I:\Home\Projects\AllegroAss\Sources\release

Add some icon, spice (winpthread libgcc_s_dw2-1 and libstdc++-6) and you are done.

BM71 No UART Response

Published on 2017-02-03 in Linux

First of all Microchip BM71 is the shittiest module I have ever seen in my life. The antenna gain is poor. Documentation is so bad that simple things are missing and maximum throughput is limited to 3KB/s with 10ms as minimum connection interval. You can find how I calculate the throughput by checking on this article about BLE specification. Here I assume you had the module. Already tried to communicate with it through UART and you failed to get any response back and now you are wondering why the module won’t reply.

The answer is quite simple, because the module is in the Transparent Mode. Transparent Mode is a state which all UART data sent to the module will simply sent out on bluetooth and no matter what you send in, the module wont respond you back. This state is sufficient if you want to send/receive data for simple tasks. But as soon as you need to change Device Name, TX Power or anything else you are stuck.

To get around this, In the Microchip way you have no way but to buy BM71 PICtail evaluation board. Although this should be simple and straightforward I don’t like how it sound. I mean  ّI hate this marketing method that “Buy our evaluation board or you can’t use the module”. So here is a workaround to overcome this problem without access to PICtail.

Program BM71 Without PICtail EVM

My module is BM71BLES1FC2-0002AA which according to datasheet must use the PC tools ending with 0002AA. BM71 Module use IS1871 chip inside. It is a little confusing but inside IS1871 page there exist a Firmware & Software Tools v1.06 (matched to my model) that have all necessary tools to configure and update BM71 module firmware.

Now here if your customized board have a high performance uController on it you just need to create a shadow CDC device that get all data coming from USB and send it to BM71. So the all fancy PICtail EVM is nothing more than a “usb to serial (UART)” converter. you need a high performance uColntroller as if the conversion speed is not fast enough isupdate Firmware updateTool through error into your face as it did happen to me. In the case you face the same error as me you need to get knowing IS1870 chip better so you can write your own firmware update tool.

IS1871 Memory Map

IS1871 have 256 Kbytes embedded Flash memory that have all firmware and module configuration. The firmware is the software that operate module during normal operation and configuration is a part of firmware that indicate Device Name, TX Power and anything else that specified as a option in the datasheet.

The firmware start from address 0x0000 and end in 0x40000. The configuration start from 0x35000 and end in 0x37000 with 0x2000 as length. The module use a firmware called BLEDK3. To change the setting for module you have to first generate the configuration header and then write the generated file to the mentioned memory address. For header generation there exist a tool with name IS187x_102_BLEDK3_UI v100.123 inside UserInterfaceTool_V100_123 folder of Firmware & Software Tools v1.06 that you downloaded earlier.

If you need more detail on how to do this please feel free to leave a comment below.

Preparing For Writing To BM71

There are 3 steps you need to do before you able to write any data on BM71.

Step 1: Enter EEPROM Mode

There is a special mode that called eeprom mode (or programming mode). The first step is to enter eeprom mode that clearly explained in the manual and BM71 datasheet. in a few words, you need to set a special pin and while holding the pin at specified level, reset the module

Step 2: Connect To Module

After entering eeprom mode, the module stop the LED blinking (if you had one on your board). then you need to send 0x01, 0x05, 0x04, 0x0D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 I don’t know why this and what data they represent but sending out this will get the state machine to “CONNECTED” state. If the operation is successful you should get something from module (If you need to know the exact response feel free to ask)

Step 3: Erase The Flash

This step seems optional but it’s not. If you don’t send erase command before writing, any attempt to change memory will result in fail writing and memory won’t change. Again I don’t know why is module working this way or if I using it in a wrong way but I can’t write any register if I don’t send Erase command before to do so.

Secondly I don’t know where the erase command does actually erase. On my simple check this command only erase configuration area that I specified before and firmware remained unchanged but I’m not sure if it’s always the case.

To erase flash send 0x02, 0xFF, 0x0F, 0x0E, 0x00, 0x12, 0x01, 0x0A, 0x00, 0x03, 0x00, 0x00, 0x40, 0x03, 0x00, 0x00, 0x20, 0x00, 0x00 any response should indicate the erase operation is successful. I highly recommend to wait 1 second before sending any further command.

I noticed that the flash operation have some inside timeout watch dog. If the writing command execute later than this timeout any write attempt result in failure.

Step ∞: Disconnect

The last step after all read/write operation is disconnection. This option seems to be optional but highly recommended to execute. The disconnect packet is 0x01, 0x06, 0x04, 0x03, 0xFF, 0x0F, 0x00

BM71 Writing

To write a register we start with a base command template then fill it with appropriate value.

Write Template: 0x02, 0xFF, 0x0F, 0x0E, 0x00, 0x11, 0x01, 0x0A, 0x00, 0x03, 0x00, 0x00, 0x46, 0x03,0x00, 0x20, 0x00, 0x00, 0x00

packet_size = data_size + 19;
address = 0x35000;

write_temp[3] = 14 + data_size;//ACL
write_temp[5] = 0x11; //COMMAND=WRITE
write_temp[7] = 10 + data_size;//ISDAP
write_temp[15] = block_size;//LENGTH
memcpy(&write_temp[11],(uint8_t*) &address, sizeof(address));//ADDRESS
memcpy(&write_temp[19],(uint8_t*) (eeprom_table), data_size);//Data

The data_size is in byte. In above example I used data_size=16. On a successful write, BM71 return 0x02, 0xFF, 0x0F, 0x0E, 0x00, 0x10, 0x01, 0x0A, 0x00, 0x03, 0x00, 0x00, 0x46, 0x03,0x00, 0x20, 0x00, 0x00, 0x00 on a failure due to requirement for flash, the second to last 0x00 will changes to 0x01.

Enable Wake Up by Keyboard/Mouse on Arch Linux

Published on 2016-10-12 in Linux

The power button on my pc case is not very handy to work with, which made waking up by mouse/keyboard an awesome idea. The first thing to achieve this is obviously, getting inside bios and enable the wake up option for keyboard/mouse, LAN or whatever you like. You probably at this step expect that things get to work out of the box.

Well…. probably no. but still you got chance. from my experience some device works out of the box and some simply don’t. why? I think because they are a little too complicated for ACPI to handle them. Here I summarize my workaround to get these kind of devices work.

Step 1: Find device path

First of all you need to find device path. Device path is both the way that the device is connected to your computer and also the way you can access your device settings on your computer. To get this path, all you need is to find your keyboard/mouse node on /dev path and feed it to udevadm. As an example for my keyboard executing something like

udevadm info -q path -n /dev/input/event0

give this path and for mouse executing

udevadm info -q path -n /dev/input/mouse0

Step 2: Find your lucky wakeup file

Next you need to surf on your device path and find a file named wakeup. it may be in your device path/power. if not look it parent directory and foreword until you find the right file. For example in my case, wakeup file turned out to be /sys/devices/pci0000:00/0000:00:14.0/usb1/1-13/power/wakeup. Then you should write enabled inside this file by running

sudo sh -c "echo enabled > '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-13/power/wakeup'"

If you are standing on a right place then probably double clicking cause your pc to wake up after suspension. if not try to looking the parent folder.

Step 3: Make The Process into Auto mode

As you know udev let you run script if specific device connected to the kernel, we exploit the idea and enable wakeup for our little cute mice.

SUBSYSTEM=="usb", ATTRS{idVendor}=="1b1c", ATTRS{idProduct}=="1b19" RUN+="/bin/sh -c 'echo enabled > /sys$env{DEVPATH}/../power/wakeup;'"

Hope You Enjoy

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