26 lines
591 B
C
26 lines
591 B
C
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#include "drv_dwt.h"
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#include "drv_clk.h"
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#define DWT_CR *(uint32_t *)0xE0001000
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#define DWT_CYCCNT *(uint32_t *)0xE0001004
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#define DEM_CR *(uint32_t *)0xE000EDFC
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#define DEM_CR_TRCENA (1 << 24)
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#define DWT_CR_CYCCNTENA (1 << 0)
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void drv_dwt_start(void)
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{
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//使能DWT外设
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DEM_CR |= (uint32_t)DEM_CR_TRCENA;
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//DWT CYCCNT寄存器计数清0
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DWT_CYCCNT = (uint32_t)0u;
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//使能Cortex-M3 DWT CYCCNT寄存器
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DWT_CR |= (uint32_t)DWT_CR_CYCCNTENA;
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}
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//返回值单位 us
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uint32_t drv_dwt_end(void)
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{
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return (uint64_t)DWT_CYCCNT * 1000000 / CLOCK_SYS_FREQ;
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}
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