| ; FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
| ; | |
| ; FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT | |
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| ; This file is part of the FreeRTOS distribution. | |
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| ; FreeRTOS is free software; you can redistribute it and/or modify it under | |
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| ; >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to | |
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| ; * * | |
| ; * Having a problem? Start by reading the FAQ "My application does * | |
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| ; http://www.FreeRTOS.org - Documentation, books, training, latest versions, | |
| ; license and Real Time Engineers Ltd. contact details. | |
| ; | |
| ; http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
| ; including FreeRTOS+Trace - an indispensable productivity tool, and our new | |
| ; fully thread aware and reentrant UDP/IP stack. | |
| ; | |
| ; http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High | |
| ; Integrity Systems, who sell the code with commercial support, | |
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| ; http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
| ; engineered and independently SIL3 certified version for use in safety and | |
| ; mission critical applications that require provable dependability. | |
| ;* | |
| ; * 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" | |
| PUBLIC vANExampleISR_ASM_Wrapper | |
| EXTERN vAnExampleISR_C_Handler | |
| RSEG CODE:CODE | |
| ; * | |
| ; * 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, an example of how to do this from an assembly file is locate at | |
| ; * the bottom of this file. | |
| ; * | |
| 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 | |
| ; The interrupt handler can be installed into the vector table in the same | |
| ; assembly file. | |
| ; Ensure the vector table segement is used. | |
| COMMON INTVEC:CODE:ROOT(1) | |
| ; | |
| ; Place a pointer to the asm wrapper at the correct index into the vector | |
| ; table. Note 56 is used is purely as an example. The correct vector | |
| ; number for the interrupt being installed must be used. | |
| ORG 58 | |
| DW vANExampleISR_ASM_Wrapper | |
| END | |