STM32F4

A portable NRF24L01 C Library for multiple hardware platform integration in Wireless Sensor Networking

For the last couple of months I have been working on a library for the NRF24L01 modules such that it would be easy to integrate multiple hardware platforms using wireless connections. The idea is to develop a library in C and make sure that the functions can be clearly separated, which would make things easier when porting the library for a different hardware platform. There can be similar libraries in the Internet at the moment but I did not try any of them except the Energia library which can be found here.

I believe Energia is a very good platform for rapid prototyping, but the Arduino like language is not close to the actual hardware modules. Following is the solution I have prepared which is written in C and is very much close to hardware. I believe this library can be used to connect different types of hardware platforms through nrf24l01 module. This is very important in Wireless Sensor Networking solutions because wireless nodes can have MCUs with different architectures. It reduces firmware complexity and module compatibility due to the uniformity of configuration.

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Using ‘FreeRTOS’ in STM32 DISCOVERY board

Recently I have been learning bits about RTOS (Real Time Operating System). I decided to try one on the STM32-DISCOVERY board. There are many RTOSs that can be used for this task. But I wanted a very simple RTOS which could quickly get me started. I’ve heard about FreeRTOS and decided to use it as an experiment.


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FreeRTOS is a very well documented RTOS. It is also free and open. It has many demonstrations(examples) and it even has general steps required to port the system to different compilers, processors and evaluation kits. To get things started quickly I wanted a compiling Keil project. I found a full project here which is compiling and can be directly put to the DISCOVERY board.

But the version of RTOS used in the sample project above is not the latest. (At the time of writing the post the RTOS version is FreeRTOS V8.1.2) I wanted to use the latest FreeRTOS and wanted to learn how to develop the project from scratch. I believe following guidelines and steps would help anyone who would require to create a FreeRTOS project in Keil for the DISCOVERY board.st

Things you need to download. (Links are embedded and are working at the time of writing)

  1. FreeRTOS package.
  2. STM32F4 Standard Peripheral Driver Library
  3. DISCOVERY board GPIO library. (Used in the main.c)
  4. Keil uVision IDE ( I will soon post a GCC port as well )

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Developing STM32F4-Discovery firmware on Linux (Part 1)

In a world where all the developers are fogged under IDEs this post might sound a bit obsolete. But when it comes to highly demanding embedded applications the Electronics Engineers need unlimited access to hardware. Then we will have to rethink whether the flexibility we required is provided by the “Expensive” IDEs.

This blog post is an aggregation of information I found through following sites. I took time to repost them here to give them wider audience. They are wonderful references.

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Links:

http://www.wolinlabs.com/blog/linux.stm32.discovery.gcc.html

https://github.com/texane/stlink

http://hackaday.com/2011/10/17/how-to-develop-for-stm32-discovery-boards-using-linux/

I tested the whole system under Ubuntu 14.04 LTS x64 OS. It worked perfectly. Mostly I followed the steps provided by the link 1. But some parts were carried out in a different way. I still did not try any debugging. In this post it will be about compiling and flashing a simple sample firmware.
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