72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
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#include <rtthread.h>
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#include <rthw.h>
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#define CPU_USAGE_CALC_TICK 10
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#define CPU_USAGE_LOOP 100
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static rt_uint8_t cpu_usage_major = 0, cpu_usage_minor= 0;
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static rt_uint32_t total_count = 0;
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static void cpu_usage_idle_hook()
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{
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rt_tick_t tick;
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rt_uint32_t count;
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volatile rt_uint32_t loop;
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if (total_count == 0)
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{
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loop = 0;
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/* get total count */
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rt_enter_critical();
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tick = rt_tick_get();
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while(rt_tick_get() - tick < CPU_USAGE_CALC_TICK)
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{
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total_count ++;
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while (loop < CPU_USAGE_LOOP) loop ++;
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}
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rt_exit_critical();
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}
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count = 0;
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loop = 0;
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/* get CPU usage */
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tick = rt_tick_get();
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while (rt_tick_get() - tick < CPU_USAGE_CALC_TICK)
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{
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count ++;
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while (loop < CPU_USAGE_LOOP) loop ++;
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}
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/* calculate major and minor */
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if (count < total_count)
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{
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count = total_count - count;
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cpu_usage_major = (count * 100) / total_count;
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cpu_usage_minor = ((count * 100) % total_count) * 100 / total_count;
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}
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else
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{
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total_count = count;
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/* no CPU usage */
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cpu_usage_major = 0;
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cpu_usage_minor = 0;
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}
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}
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void cpu_usage_get(rt_uint8_t *major, rt_uint8_t *minor)
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{
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RT_ASSERT(major != RT_NULL);
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RT_ASSERT(minor != RT_NULL);
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*major = cpu_usage_major;
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*minor = cpu_usage_minor;
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}
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void cpu_usage_init()
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{
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/* set idle thread hook */
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rt_thread_idle_sethook(cpu_usage_idle_hook);
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}
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