Question

Please all the steps!

Describe the ISR assembly language structure.

Answer 1

the peripheral responsible for dealing with it raises an interrupt to the CPU.

The task of this routine is to raise the processor priority to that of the device interrupting (so that a lower-level device cannot preempt), call either an internal kernel routine or an extrenal routine called an ISR,that deals with the interrupt is called interrupt service routine,and then restore the processor priority.

Interrupt means to break the sequence of operation.

While the CPU is executing a program an interrupt breaks the normal sequence of execution of instructions & diverts its execution to some other program.

This program to which the control is transferred is called the interrupt service routine.

The T-Kernel allows developers to create two types of interrupt handlers: handlers written in assembly or handlers written in a high-level language

Coding the Interrupt Handler

Read/ write data from/ to the peripheral,Remove the interrupt request,Inform the application that the interrupt occurred,Return from the exception

The main example of a low-level ISR is the timer service routine that runs at every system tick.

Registering/ defining a Low Level ISR

This step is similar to that for a high-level ISR. Once you have written the function for the interrupt handler, you need to register it with the T-Kernel so that it is called when the interrupt happens the next time.