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138850 Bob Green 2026-03-29 13:55:51
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# Handling Interrupts
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a3050c Bob Green 2026-03-29 13:57:47
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This actually is very simple. gcc provides the means to mark a function as an interrupt service routine, namely prefixing a function with `__attribute__(interrupt)`. So, something like this:
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```c
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__attribute__((interrupt)) duart_interrupt(void) {
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/* Handle the interrupt */
3dedcc Bob Green 2026-03-29 14:01:16
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}
a3050c Bob Green 2026-03-29 13:57:47
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```
3dedcc Bob Green 2026-03-29 14:01:16
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But there's a macro in `machine.h` to help, so you could replace the above with:
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```c
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#include <machine.h>
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ISR duart_interrupt(void) {
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/* Handle the interrupt */
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}
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```
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gcc knows that functions declared using either of the above methods should end with the `rte` rather than `rts` instruction.