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Create new file "atomic.h" 

as discussed here: https://github.com/rogerclarkmelbourne/Arduino_STM32/issues/403, taken from http://www.stm32duino.com/viewtopic.php?f=3&t=258&start=10
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stevstrong 2017-12-10 09:35:48 +01:00 committed by GitHub
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STM32F1/system/libmaple/include/libmaple/atomic.h Normal file
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/*
* This is port of Dean Camera's ATOMIC_BLOCK macros for AVR to ARM Cortex M3
* v1.0
* Mark Pendrith, Nov 27, 2012.
*
* From Mark:
* >When I ported the macros I emailed Dean to ask what attribution would be
* >appropriate, and here is his response:
* >
* >>Mark,
* >>I think it's great that you've ported the macros; consider them
* >>public domain, to do with whatever you wish. I hope you find them useful.
* >>
* >>Cheers!
* >>- Dean
*/
#ifndef _CORTEX_M3_ATOMIC_H_
#define _CORTEX_M3_ATOMIC_H_
static __inline__ uint32_t __get_primask(void) \
{ uint32_t primask = 0; \
__asm__ volatile ("MRS %[result], PRIMASK\n\t":[result]"=r"(primask)::); \
return primask; } // returns 0 if interrupts enabled, 1 if disabled
static __inline__ void __set_primask(uint32_t setval) \
{ __asm__ volatile ("MSR PRIMASK, %[value]\n\t""dmb\n\t""dsb\n\t""isb\n\t"::[value]"r"(setval):); \
__asm__ volatile ("" ::: "memory");}
static __inline__ uint32_t __iSeiRetVal(void) \
{ __asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
__asm__ volatile ("" ::: "memory"); return 1; }
static __inline__ uint32_t __iCliRetVal(void) \
{ __asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
__asm__ volatile ("" ::: "memory"); return 1; }
static __inline__ void __iSeiParam(const uint32_t *__s) \
{ __asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
__asm__ volatile ("" ::: "memory"); (void)__s; }
static __inline__ void __iCliParam(const uint32_t *__s) \
{ __asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
__asm__ volatile ("" ::: "memory"); (void)__s; }
static __inline__ void __iRestore(const uint32_t *__s) \
{ __set_primask(*__s); __asm__ volatile ("dmb\n\t""dsb\n\t""isb\n\t"); \
__asm__ volatile ("" ::: "memory"); }
#define ATOMIC_BLOCK(type) \
for ( type, __ToDo = __iCliRetVal(); __ToDo ; __ToDo = 0 )
#define ATOMIC_RESTORESTATE \
uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
#define ATOMIC_FORCEON \
uint32_t primask_save __attribute__((__cleanup__(__iSeiParam))) = 0
#define NONATOMIC_BLOCK(type) \
for ( type, __ToDo = __iSeiRetVal(); __ToDo ; __ToDo = 0 )
#define NONATOMIC_RESTORESTATE \
uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
#define NONATOMIC_FORCEOFF \
uint32_t primask_save __attribute__((__cleanup__(__iCliParam))) = 0
#endif