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[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_mtime.c] - Diff between revs 51 and 59
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Rev 59 |
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Line 117... |
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/**********************************************************************//**
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/**********************************************************************//**
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* Set compare time register (MTIMECMP) for generating interrupts.
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* Set compare time register (MTIMECMP) for generating interrupts.
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*
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*
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* @note The interrupt is triggered when MTIME >= MTIMECMP.
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* @note The interrupt is triggered when MTIME >= MTIMECMP.
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* @note The interrupt is acknwoledged by writing to the MTIMECMP.HI register.
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* @note Global interrupts and the timer interrupt source have to be enabled .
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* @note The timer interrupt is enabled via neorv32_cpu_mti_enable(void) and disabled via neorv32_cpu_mti_disable(void).
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* @note Global interrupts have to be enabled via neorv32_cpu_eint(void).
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*
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*
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* @param[in] timecmp System time for interrupt (uint64_t)
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* @param[in] timecmp System time for interrupt (uint64_t)
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**************************************************************************/
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**************************************************************************/
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void neorv32_mtime_set_timecmp(uint64_t timecmp) {
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void neorv32_mtime_set_timecmp(uint64_t timecmp) {
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MTIMECMP_LO = -1; // prevent mtimecmp from temporarily becoming smaller than the lesser of the old and new values
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union {
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MTIMECMP = timecmp;
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uint64_t uint64;
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uint32_t uint32[sizeof(uint64_t)/2];
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} cycles;
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cycles.uint64 = timecmp;
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MTIMECMP_LO = -1; // prevent MTIMECMP from temporarily becoming smaller than the lesser of the old and new values
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MTIMECMP_HI = cycles.uint32[1];
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MTIMECMP_LO = cycles.uint32[0];
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}
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}
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/**********************************************************************//**
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/**********************************************************************//**
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* Get compare time register (MTIMECMP).
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* Get compare time register (MTIMECMP).
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