mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* Copyright (C) 2014 Freie Universität Berlin
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU Lesser
|
|
* General Public License v2.1. See the file LICENSE in the top level
|
|
* directory for more details.
|
|
*/
|
|
|
|
/**
|
|
* @ingroup cpu
|
|
* @{
|
|
*
|
|
* @file
|
|
* @brief ISR related functions
|
|
*
|
|
* @author Kaspar Schleiser <kaspar@schleiser.de>
|
|
* @author Oliver Hahm <oliver.hahm@inria.fr>
|
|
*
|
|
* @}
|
|
*/
|
|
|
|
#include "irq.h"
|
|
#include "cpu.h"
|
|
|
|
volatile int __inISR = 0;
|
|
|
|
char __isr_stack[MSP430_ISR_STACK_SIZE];
|
|
|
|
unsigned int disableIRQ(void)
|
|
{
|
|
unsigned int state;
|
|
__asm__("mov.w r2,%0" : "=r"(state));
|
|
state &= GIE;
|
|
|
|
if (state) {
|
|
/* puts("-"); */
|
|
__asm__ __volatile__("bic %0, r2" : : "i"(GIE));
|
|
/* this NOP is needed to handle a "delay slot" that all MSP430 MCUs
|
|
impose silently after messing with the GIE bit, DO NOT REMOVE IT! */
|
|
__asm__ __volatile__("nop");
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
unsigned int enableIRQ(void)
|
|
{
|
|
unsigned int state;
|
|
__asm__("mov.w r2,%0" : "=r"(state));
|
|
state &= GIE;
|
|
|
|
if (!state) {
|
|
__asm__ __volatile__("bis %0, r2" : : "i"(GIE));
|
|
/* this NOP is needed to handle a "delay slot" that all MSP430 MCUs
|
|
impose silently after messing with the GIE bit, DO NOT REMOVE IT! */
|
|
__asm__ __volatile__("nop");
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
void restoreIRQ(unsigned int state)
|
|
{
|
|
if (state) {
|
|
__asm__ __volatile__("bis %0, r2" : : "i"(GIE));
|
|
/* this NOP is needed to handle a "delay slot" that all MSP430 MCUs
|
|
impose silently after messing with the GIE bit, DO NOT REMOVE IT! */
|
|
__asm__ __volatile__("nop");
|
|
}
|
|
}
|
|
|
|
int inISR(void)
|
|
{
|
|
return __inISR;
|
|
}
|