Exception Programming
Publisher Summary
This chapter discusses the usage and scope of Cortex™-M3 processor, the interrupt controller Nested Vectored Interrupt Controller that handles a number of processing tasks. It explores the stack setup—using the Main Stack Pointer for the whole program—the vector table, and the programmable priority of all exceptions, which, by default, are in the priority level 0. For hard fault exceptions and the non-maskable interrupt, the priority levels are -1 and -2, respectively. In the Cortex-M3, interrupt handlers can be programmed completely in C, whereas in ARM7, an assembly handler is commonly used to ensure that all registers are saved. In most cases, some of the interrupts are unused and can be used ...
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