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Merge pull request #308 from FrankBoesing/patch-2
optimized delayNanosecondsteensy4-core
Paul Stoffregen
6 years ago
1 changed files with 1 additions and 1 deletions
+ 1
- 1
teensy4/core_pins.h
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| static inline void delayNanoseconds(uint32_t nsec) | static inline void delayNanoseconds(uint32_t nsec) | ||||
| { | { | ||||
| uint32_t begin = ARM_DWT_CYCCNT; | uint32_t begin = ARM_DWT_CYCCNT; | ||||
| uint32_t cycles = ((uint64_t)F_CPU_ACTUAL * nsec) / 1000000000UL; | |||||
| uint32_t cycles = ((F_CPU_ACTUAL>>16) * nsec) / (1000000000UL>>16); | |||||
| while (ARM_DWT_CYCCNT - begin < cycles) ; // wait | while (ARM_DWT_CYCCNT - begin < cycles) ; // wait | ||||
| } | } | ||||
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