This makes sense now, and would be useful for shorter wait-times. Could be used for PulseIn etc. where we need defined very short delays.main
while (ARM_DWT_CYCCNT - begin < cycles) ; // wait | while (ARM_DWT_CYCCNT - begin < cycles) ; // wait | ||||
} | } | ||||
static inline void delayNanoseconds(uint32_t) __attribute__((always_inline, unused)); | |||||
static inline void delayNanoseconds(uint32_t nsec) | |||||
{ | |||||
uint32_t begin = ARM_DWT_CYCCNT; | |||||
uint32_t cycles = ((uint64_t)F_CPU_ACTUAL * nsec) / 1000000000UL; | |||||
while (ARM_DWT_CYCCNT - begin < cycles) ; // wait | |||||
} | |||||
unsigned long rtc_get(void); | unsigned long rtc_get(void); |