Saturday, April 12, 2014

Remotely GDB USART1 Project with STM32F429I Discovery Board

1 Introduction

In this article we are going to GDB remotely debug an USART1 project on STM32F429 Discovery board. System clock configuration and USART fractional buad rate calculation will also be introduced.

Friday, March 14, 2014

STM32F429I Discovery SMS Emulator on Linux

1 Introduction

Alessandro Rocchegiani released some interesting projects on STM32 series MCUs. This article introduces the adding support to be built and burned under Linux, with the project STM32F429 Discovery Sega Master System Emulator as an example.

Friday, February 28, 2014

USB HID Report Descriptor Parser in Python

1 Introduction

This is a similar tool as HID Descriptor Tool that is avaliable in USB-IF. Not intended to re-create the wheel, my purpose is to quickly create an utility that can parse the following USB HID Report Descriptors:
  1. descriptors which are binaries
  2. descriptors for an USB Sensor HUB
A script language (python) is chosen because of the need of writing it in a quick way.

Tuesday, August 6, 2013

Kernel menuconfig to move in VIM ways

Specially for VIM fans. The following is a patch to current (GIT) linux kernel lxdialog that allows you to move with h,j,k,l keys in menuconfig. Please click HERE to download the whole patch file.

Sunday, July 7, 2013

Python Print String Descriptors for the USB HID Devices

1 Inctroduction

In this tutorial, we are going to write two small python programs that prints the String Descriptors for all the USB HID devices in the system. To do this, there are many choices of libraries for assistence. I will introduce two of them - PyUSB and PyWin32. PyUSB supports both Linux and Windows, and PyWin32 supports Windows only.

Friday, September 28, 2012

Writing Your First PyQt4 OpenGL Program

1 Introduction

In this tutorial, we are going to have a glimpse of OpenGL programming in Python. I will introduce several simple Qt GUI applications and show you basic OpenGL programs.
Python is a programming language that lets you work more quickly and integrate your systems more effectively. PyQt is a Python wrapper for the C++ GUI framework Qt. Qt is a framework that uses the native widgets to draw its user interfaces.
PyOpenGL is a cross-platform open source Python binding to the standard OpenGL API. OpenGL is an application program interface that is used to define 2D and 3D computer graphics.
The article is written under Debian Linux. Packages that are required will be installed using powerful APT tool. If you are not a Linux user, however, don't worry. Since Python is a cross-platform language, Qt is a cross-platform framework, OpenGL is also a cross-platform interface, all the programs in this article also work for you. Just 'translate' the package installations according to your system and have fun.

Thursday, December 29, 2011

GDB Debugging ARM U-Boot on QEMU

1 Introduction


QEMU is a generic and open source machine emulator and virtualizer. In this article, we will use it as a machine emulator and run the U-Boot on top of it. It will also be demonstrated about how to debug U-Boot with GDB.

Wednesday, April 6, 2011

MIPS Exceptions Initialization and Handling on Linux

Exceptions and interrupts are un-expected events that disrupt the normal flow of execution. Interrupts are unexpected events from outside the CPU core. Exceptions are from within the CPU, including memory translation exceptions, cache misses, unusual program conditions such as unaligned loads, system calls and traps, and so on.

MIPS architecture adopts precise exception mechanisms, and make it easy for the software to deal with the exceptions. After any exception, CP0 EPC register points to the correct place to restart execution after the exception is dealt with.

Friday, March 4, 2011

Learning the Linux Boot Memory Allocator (MIPS)

Do you ever look at the report of 'cat /proc/meminfo' and wonder why the reported MemTotal is not equal to the amount of memory you have for the system? The followed is an example report from one of my systems. It shows the total memory is 60860kB (59.4MB) from line 2:

1 # cat /proc/meminfo
2 MemTotal:          60860 kB
3 MemFree:           47448 kB
4 Buffers:               0 kB
5 Cached:             7180 kB
6 SwapCached:            0 kB
7 ... 

which is different from the amount of memory that bootloader gave to kernel, 64MB.
1 ...
2 ## Transferring control to Linux (at address 800042f0) ...
3 ## Giving linux memsize in MB, 64