/* | |
* FreeRTOS Kernel V10.0.0 | |
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* 1 tab == 4 spaces! | |
*/ | |
/* | |
* This file defines the assembler wrapper for the example interrupt that is | |
* defined in main.c. The wrapper is the interrupt entry point. | |
*/ | |
/* ISR_Support.h contains the definitions of portSAVE_CONTEXT() and | |
portRESTORE_CONTEXT(). */ | |
#include "ISR_Support.h" | |
.global _vANExampleISR_ASM_Wrapper | |
.extern _vAnExampleISR_C_Handler | |
.text | |
/* | |
* This demo does not include a functional interrupt service routine - so | |
* this dummy handler (which is not actually installed) is provided as an | |
* example of how an ISR that needs to cause a context switch needs to be | |
* implemented. ISRs that do not cause a context switch have no special | |
* requirements and can be written as per the compiler documentation. | |
* | |
* This assembly wrapper function calls the main handler, which is called | |
* vAnExampleISR_C_Handler(), and is implemented in main.c. See the | |
* documentation page for this demo on the FreeRTOS.org website for full | |
* instructions. | |
* | |
* NOTE: vANExampleISR_ASM_Wrapper needs to be installed into the relevant | |
* vector within vector_table.c. | |
*/ | |
vANExampleISR_ASM_Wrapper: | |
/* portSAVE_CONTEXT() must be the first thing called in the ASM | |
wrapper. */ | |
portSAVE_CONTEXT | |
/* Once the context has been saved the C handler can be called. */ | |
call !!_vAnExampleISR_C_Handler | |
/* Finally the ISR must end with a call to portRESTORE_CONTEXT() | |
followed by a reti instruction to return from the interrupt to whichever | |
task is now the task selected to run (which may be different to the task | |
that was running before the interrupt started). */ | |
portRESTORE_CONTEXT | |
reti | |
.end | |