The Definitive Guide to the ARM Cortex-M3

CHAPTER 11 Exceptions Programming

In This Chapter:

• Using Interrupts

• Exception/Interrupt Handlers

• Software Interrupts

• Example with Exception Handlers

• Using SVC

• SVC Example: Use for Output Functions

• Using SVC with C

Using Interrupts

Interrupts are used in almost all embedded applications. In the Cortex-M3 processor, the interrupt controller NVIC handles a number of processing tasks for you, including priority checking and stacking/unstacking of registers. However, a number of tasks have to be prepared when an interrupt is used:

• Stack setup
• Vector table setup
• Interrupt priority setup
• Enable the interrupt

Stack Setup

For simple application development, you can use the MSP for the whole program. That way you need to reserve memory ...