__irq keyword

Hi all, I use a STR912 device from ST. In the examples from their library, the interrupt functions are not preceeded with the __irq keyword. 2 questions : What is the difference between a...
ARM Keywords

Note: This was originally posted on 9th July 2013 at http://forums.arm.com Hi, I am new to the ARM world. In one of the sample program that , i found some architectural conditions as below.. #if (defined...
volatile keyword

The application note suggests to wrap a timer tick variable in a function which disables all interrupts, reads and copies the variable into a temp, re-enables interrupts, then returns the temp. Can...
_at_ keyword

Hello, We are using _at_ keyword to locate a variable at particular address. We declared the variable as per the description given in Help for the _at_ keyword. The declaration of variable we done...
Volatile keyword

IU have a variable which can be chyanged outside the interrupt but inside the ISR it is only read. Its value don't change in it. Should it be volatile.