Tag Archives: ARM

An Introduction to Hypervisors

Andy McCormick

Andy McCormick

Technical Consultant at Feabhas Ltd
I provide expertise and training for Embedded Linux courses.

I have over 20 years of experience in the embedded sector, gained at companies such as Pace, Open TV and Sony Semiconductor Europe.

I've led work on numerous projects at all stages in the design cycle with comprehensive expertise in software engineering design, support and integration.
Andy McCormick

Hypervisors are becoming commonplace in the embedded world, especially in high-end multi-core systems. If you’d asked me about virtualisation or hypervisors 2 years ago, like most people I didn’t know much about them. A hypervisor, that’s a super-supervisor, right? Virtualisation, you mean Virtual Machines, right? Running Linux on Windows using VMware, right? Not any more!

Here at Feabhas we’ve noticed a lot of our clients and contacts are starting to look at designs using hypervisors in embedded systems for a number of […]

Posted in ARM, Design Issues, General, Industry Analysis, Linux | Tagged , , , , , | Leave a comment

Function Parameters and Arguments on 32-bit ARM

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

Function call basics

When teaching classes about embedded C  or embedded C++ programming, one of the topics we always address is “Where does the memory come from for function arguments?“

Take the following simple C function:

void test_function(int a, int b, int c, int d);

when we invoke the function, where are the function arguments stored?

int main(void)
{
  //…
  test_function(1,2,3,4);
  //…
}

Unsurprisingly, the most common answer after “I don’t know” is “the stack“; and of course if you were compiling for x86 this would […]

Posted in ARM, C/C++ Programming, Cortex | Tagged , , | 5 Comments

Native C/C++ Application development for the mbed using CMSIS-DAP

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

If you have been following the Feabhas blog for some time, you may remember that in April of last year I posted about my experiences of using the MQTT protocol. The demonstration code was ran the ARM Cortex-M3 based mbed platform.

For those that are not familiar with the mbed, it is an “Arduino-like” development platform for small microcontroller embedded systems. The variant I’m using is built using an NXP LPC1768 Cortex-M3 device, which offers a plethora of connection options, ranging […]

Posted in ARM, C/C++ Programming, CMSIS, Cortex | Tagged , , , , , , , | 2 Comments

Developing a Generic Hard Fault handler for ARM Cortex-M3/Cortex-M4

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

This posting assumes you that you have a working ARM Cortex-M3 base project in Keil uVision. If not, please see the “howto” video: Creating ARM Cortex-M3 CMSIS Base Project in uVision

Divide by zero error

Given the following C function

int div(int lho, int rho)
{
return lho/rho;
}

called from main with these arguments

int main(void)
{
int a = 10;
int b = 0;
int c;
c = div(a, b);
// other code
}

You […]

Posted in ARM, C/C++ Programming, CMSIS, Cortex | Tagged , , , | 17 Comments

CMSIS-RTOS Presentation

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

I have finally finished and sent off my presentation for next weeks Hitex one-day ARM User Conferences titled “ARM – the new standard across the board?” at the National Motorcycle Museum in Solihull.

Back in February, at the embeddedworld exhibition and conference in Nuremberg, Germany, ARM announced the latest version (version 3) of the Cortex(tm) Microcontroller Software Interface Standard (CMSIS). The major addition is the introduction of an abstraction layer for Real-Time Operating Systems (RTOS).

The presentation I’m giving explains; what […]

Posted in ARM, CMSIS, Cortex, General, RTOS | Tagged , , | 4 Comments