Tag Archives: Cortex-M

Introduction to the ARM® Cortex®-M7 Cache – Part 1 Cache Basics

Posted on October 15, 2020 by Niall Cooling
Niall Cooling
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.
Niall Cooling
Latest posts by Niall Cooling (see all)

For many years, the majority of smaller microprocessor-based systems have typically not used caches. With the launch of the ARMv7 architectures, caches were supported in the ARMv7-A family (e.g. Cortex-A8, etc.) but not supported in the core design of the ARMv7-M micro-controllers such as the Cortex-M3 and Cortex-M4. However, when the Cortex-M7 was announced, it broke that mould by offering cache support for the smaller embedded micro-controller.

This series is broken down in three parts:

Basic principles of cache
Cache replacement policies
Optimising software […]

Posted in ARM, CMSIS, Cortex, Design Issues | Tagged , , , , | Leave a comment

Making things do stuff – Part 2

Posted on April 6, 2017 by Glennan Carnie
Glennan Carnie
Glennan Carnie
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie
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Last time we looked at the basics of hardware manipulation in C++.   This time we’ll apply this to some real hardware and have a look at the code

Posted in C/C++ Programming, Cortex, General | Tagged , , , , , , , | 4 Comments

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

Posted on February 1, 2013 by Niall Cooling
Niall Cooling
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.
Niall Cooling
Latest posts by Niall Cooling (see all)

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 , , , | 24 Comments

CMSIS-RTOS Presentation

Posted on May 11, 2012 by Niall Cooling
Niall Cooling
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.
Niall Cooling
Latest posts by Niall Cooling (see all)

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