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Use DWT if exposed and present

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This commit is contained in:
Michael Miller
2021-03-28 13:21:15 -07:00
parent 9b5eac22fc
commit 3e5e4bb5ba
1 changed files with 11 additions and 2 deletions
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13
src/internal/NeoArmBitBangMethod.h
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@@ -169,23 +169,32 @@ public:
protected: protected:
static inline uint32_t getCycleCount(void) static inline uint32_t getCycleCount(void)
{ {
#ifdef DWT
// use the general exposed access object
return DWT->CYCCNT;
#else
return *((volatile uint32_t*)0xE0001004); return *((volatile uint32_t*)0xE0001004);
#endif
} }
static inline void startCycleCount() static inline void startCycleCount()
{ {
// init DWT feature #ifndef DWT
// init DWT feature since not exposed for general use
(*((volatile uint32_t*)0xE000EDFC)) |= 0x01000000; (*((volatile uint32_t*)0xE000EDFC)) |= 0x01000000;
// init DWT Count to zero // init DWT Count to zero
*((volatile uint32_t*)0xE0001004) = 0; *((volatile uint32_t*)0xE0001004) = 0;
// start DWT // start DWT
(*(volatile uint32_t*)0xe0001000) |= 0x40000001; (*(volatile uint32_t*)0xe0001000) |= 0x40000001;
#endif
} }
static inline void stopCycleCount() static inline void stopCycleCount()
{ {
// stop DWT #ifndef DWT
// stop DWT since not exposed generally
(*(volatile uint32_t*)0xe0001000) &= ~0x00000001; (*(volatile uint32_t*)0xe0001000) &= ~0x00000001;
#endif
} }
}; };