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45 lines
948 B
45 lines
948 B
#ifndef _STOPWATCH_H |
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#define _STOPWATCH_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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extern uint32_t us_ticks; |
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#define DEMCR_TRCENA 0x01000000 |
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/* Core Debug registers */ |
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#define DEMCR (*((volatile uint32_t *)0xE000EDFC)) |
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#define DWT_CTRL (*(volatile uint32_t *)0xe0001000) |
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#define CYCCNTENA (1<<0) |
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#define DWT_CYCCNT ((volatile uint32_t *)0xE0001004) |
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#define CPU_CYCLES *DWT_CYCCNT |
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void stopwatch_init(void); |
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void stopwatch_delay_us(uint32_t us); |
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static inline void stopwatch_reset(void) |
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{ |
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/* enable DWT access */ |
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DEMCR |= DEMCR_TRCENA; |
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*DWT_CYCCNT = 0; |
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/* enable the CPU cycle counter */ |
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DWT_CTRL |= CYCCNTENA; |
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} |
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static inline uint32_t stopwatch_getticks() |
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{ |
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return CPU_CYCLES; |
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} |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
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/*---------------------------------------------------------------------------- |
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* end of file |
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*---------------------------------------------------------------------------*/
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