ARM® Cortex® M4 Cookbook by Dr. Mark Fisher

Author:Dr. Mark Fisher
Language: eng
Format: mobi
Publisher: Packt Publishing
Published: 2016-03-15T22:00:00+00:00

See also

In addition to the instruction set, an assembly language programmer also needs knowledge of the assembler directives, such as EQU, and so on. For further information, refer to the ARM Assembler Directives Reference (http://infocenter.arm.com/).

Handling interrupts in assembly language

ARM Cortex interrupt handlers can be programmed completely in C, but programmers coding time-critical applications prefer to use assembler (some programmers claim, rather ambitiously, that their hand-crafted assembler programs run up to 30-times faster than compiler generated code, but I suspect that the actual figure is 2-3 times).

When an interrupt (also known as an exception) occurs, the processor responds by performing the following actions:

Pushing Registers R0-R3, R12, link register (LR), program counter (PC), and program status (PSR) onto the stack

Reading the address of the exception handler from the interrupt vector table

Updating the stack pointer, program status, link register, and program counter

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