灵动微课堂 (第138讲) | 基于MM32 MCU的OS移植与应用——RT-Thread CPU利用率统计

2.2
添加CPU占用率统计的实现代码：
/* Private define -----------------------------------------------------------*/
#define MM32_CPU_USAGE_TICK 10
#define MM32_CPU_USAGE_LOOP 100


/* Private variables --------------------------------------------------------*/
rt_uint8_t mm32_cpu_usage_integer = 0;
rt_uint8_t mm32_cpu_usage_decimal = 0;
rt_uint32_t mm32_cpu_usage_count = 0;

/******************************************************************************
* @Brief
* @param
* @retval
* @attention
******************************************************************************/
void mm32_cpu_usage_hook(void)
{
volatile rt_tick_t tick = 0;
volatile rt_uint32_t count = 0;
volatile rt_uint32_t loop = 0;

if(mm32_cpu_usage_count == 0)
{
rt_enter_critical();

tick = rt_tick_get();

while((rt_tick_get() - tick) < MM32_CPU_USAGE_TICK)
{
mm32_cpu_usage_count++;

loop = 0;

while(loop < MM32_CPU_USAGE_LOOP)
{
loop++;
}
}

rt_exit_critical();
}

count = 0;
tick = rt_tick_get();

while((rt_tick_get() - tick) < MM32_CPU_USAGE_TICK)
{
count++;

loop = 0;

while(loop < MM32_CPU_USAGE_LOOP)
{
loop++;
}
}

/* Calculate MM32 CPU Usage */
if(count < mm32_cpu_usage_count)
{
count = mm32_cpu_usage_count - count;

mm32_cpu_usage_integer = (count * 100) / mm32_cpu_usage_count;
mm32_cpu_usage_decimal = ((count * 100) % mm32_cpu_usage_count) * 100 / mm32_cpu_usage_count;
}
else
{
mm32_cpu_usage_count = count;

mm32_cpu_usage_integer = 0;
mm32_cpu_usage_decimal = 0;
}
}

/******************************************************************************
* @brief
* @param
* @retval
* @attention
******************************************************************************/
void mm32_cpu_usage_get(rt_uint8_t *integer, rt_uint8_t *decimal)
{
RT_ASSERT(integer != RT_NULL);
RT_ASSERT(decimal != RT_NULL);

*integer = mm32_cpu_usage_integer;
*decimal = mm32_cpu_usage_decimal;
}
2.3
添加测试线程代码，并将CPU利用率的钩子函数设置为IDLE钩子函数，在其中一个线程中读取并打印当前的CPU利用率：
/* Private define -----------------------------------------------------------*/
#define MM32_THREAD_STACK_SIZE 512
#define MM32_THREAD_PRIORITY 5
#define MM32_THREAD_TIMESLICE 10

/* Private variables --------------------------------------------------------*/
static rt_thread_t mm32_thread1 = RT_NULL;

static char mm32_thread2_stack[1024];
static struct rt_thread mm32_thread2;

/******************************************************************************
* @brief
* @param
* @retval
* @attention
******************************************************************************/
void mm32_thread1_entry(void *parameter)
{
rt_uint8_t integer = 0;
rt_uint8_t decimal = 0;

/* Init LEDs GPIO */
BSP_LED_Init();

while(1)
{
/* Toggle LED1~LED2 status */
BSP_LED1_TOGGLE();
BSP_LED2_TOGGLE();

mm32_cpu_usage_get(&integer, &decimal);

rt_kprintf("MM32 CPU Usage : %d.%d%rn", integer, decimal);

/* Delay 500ms */
rt_thread_mdelay(1000);
}
}

/******************************************************************************
* @brief
* @param
* @retval
* @attention
******************************************************************************/
void mm32_thread2_entry(void *parameter)
{
while(1)
{
/* Toggle LED3~LED4 status */
BSP_LED3_TOGGLE();
BSP_LED4_TOGGLE();

/* Delay 250ms */
rt_thread_mdelay(250);
}
}

/******************************************************************************
* @brief
* @param
* @retval
* @attention
******************************************************************************/
int main(void)
{
mm32_thread1 = rt_thread_create("thread1",
mm32_thread1_entry, RT_NULL,
MM32_THREAD_STACK_SIZE,
MM32_THREAD_PRIORITY,
MM32_THREAD_TIMESLICE);

if(mm32_thread1 != RT_NULL)
{
rt_thread_startup(mm32_thread1);
}

rt_thread_init(&mm32_thread2, "thread2",
mm32_thread2_entry, RT_NULL,
&mm32_thread2_stack[0],
sizeof(mm32_thread2_stack),
MM32_THREAD_PRIORITY - 1,
MM32_THREAD_TIMESLICE);

rt_thread_startup(&mm32_thread2);

/* Set Idle Thread Hook */
rt_thread_idle_sethook(mm32_cpu_usage_hook);

return 0;
}
3. 结果验证
编译软件工程无误后，下载代码到芯片；在串口终端工具中我们可以看到当前两个LED灯闪烁线程对于CPU的利用率情况：