diff options
Diffstat (limited to 'Demo/NEC_78K0R_IAR/ButtonISR.s26')
| -rw-r--r-- | Demo/NEC_78K0R_IAR/ButtonISR.s26 | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/Demo/NEC_78K0R_IAR/ButtonISR.s26 b/Demo/NEC_78K0R_IAR/ButtonISR.s26 index 9ddf2577..cef488cf 100644 --- a/Demo/NEC_78K0R_IAR/ButtonISR.s26 +++ b/Demo/NEC_78K0R_IAR/ButtonISR.s26 @@ -30,6 +30,14 @@ ;
;------------------------------------------------------------------------------
+;
+; This file defines a wrapper for the interrupt generated each time the button
+; on the target board is pushed. The asm wrapper is used to save and restore
+; the task context as a context switch may occur within the ISR itself.
+; The C portion of the ISR is defined within ButtonTask.c.
+;
+
+; Include the portSAVE_CONTEXT and portRESTORE_CONTEXT macros.
#include "ISR_Support.h"
PUBLIC vButtonISRWrapper
@@ -37,15 +45,21 @@ RSEG CODE:CODE
-vButtonISRWrapper:
+vButtonISRWrapper:
+ ; Save the current task context.
portSAVE_CONTEXT
+
+ ; Call the C portion of the ISR.
call vButtonISRHandler
+
+ ; Restore the context of whichever task is to run next - which might be
+ ; different from the task that was originally interrupted.
portRESTORE_CONTEXT
- RETI
+ reti
- ; Set ISR location to the Interrupt vector table.
+ ; Place the ISR into the vector table.
COMMON INTVEC:CODE:ROOT(1)
ORG 8
`??vButtonISRWrapper??INTVEC 8`:
|