FreeRTOS中打印任务执行情况的portALT_GET_RUN_TIME_COUNTER_VALUE实现方法

eric2013

portALT_GET_RUN_TIME_COUNTER_VALUE的实现在例子：CORTEX_STM32L152_IAR中有函数。
实际测试了一下这种方法，不好用，测试出来CPU利用率不正确，估计哪里有bug
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eric2013

最近做的V4板子里面的FreeRTOS例子我一直用的是：
portGET_RUN_TIME_COUNTER_VALUE
portALT_GET_RUN_TIME_COUNTER_VALUE和portGET_RUN_TIME_COUNTER_VALUE只能二选一：

eric2013

使用1楼的实现方法可以让系统更少的进入定时器中断：

1. void vConfigureTimerForRunTimeStats( void )
2. {
3. TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
4. NVIC_InitTypeDef NVIC_InitStructure;
6.     /* The time base for the run time stats is generated by the 16 bit timer 6.
7.     Each time the timer overflows ulTIM6_OverflowCount is incremented.
8.     Therefore, when converting the total run time to a 32 bit number, the most
9.     significant two bytes are given by ulTIM6_OverflowCount and the least
10.     significant two bytes are given by the current TIM6 counter value.  Care
11.     must be taken with data    consistency when combining the two in case a timer
12.     overflow occurs as the value is being read.
14.     The portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() macro (in FreeRTOSConfig.h) is
15.     defined to call this function, so the kernel will call this function
16.     automatically at the appropriate time. */
18.     /* TIM6 clock enable */
19.     RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM6, ENABLE );
21.     /* The 32MHz clock divided by 5000 should tick (very) approximately every
22.     150uS and overflow a 16bit timer (very) approximately every 10 seconds. */
23.     TIM_TimeBaseStructure.TIM_Period = 65535;
24.     TIM_TimeBaseStructure.TIM_Prescaler = 5000;
25.     TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
26.     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
28.     TIM_TimeBaseInit( TIM6, &TIM_TimeBaseStructure );
30.     /* Only interrupt on overflow events. */
31.     TIM6->CR1 |= TIM_CR1_URS;
33.     /* Enable the interrupt. */
34.     TIM_ITConfig( TIM6, TIM_IT_Update, ENABLE );
36.     /* Enable the TIM6 global Interrupt */
37.     NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn;
38.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_LOWEST_INTERRUPT_PRIORITY;
39.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00; /* Not used as 4 bits are used for the pre-emption priority. */
40.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
41.     NVIC_Init(&NVIC_InitStructure);
43.     TIM_ClearITPendingBit( TIM6, TIM_IT_Update );
44.     TIM_Cmd( TIM6, ENABLE );
45. }
46. /*-----------------------------------------------------------*/
48. void TIM6_IRQHandler( void )
49. {
50.     /* Interrupt handler for TIM 6
52.     The time base for the run time stats is generated by the 16 bit timer 6.
53.     Each time the timer overflows ulTIM6_OverflowCount is incremented.
54.     Therefore, when converting the total run time to a 32 bit number, the most
55.     significant two bytes are given by ulTIM6_OverflowCount and the least
56.     significant two bytes are given by the current TIM6 counter value.  Care
57.     must be taken with data    consistency when combining the two in case a timer
58.     overflow occurs as the value is being read. */
59.     if( TIM_GetITStatus( TIM6, TIM_IT_Update) != RESET)
60.     {
61.         ulTIM6_OverflowCount++;
62.         TIM_ClearITPendingBit( TIM6, TIM_IT_Update );
63.     }
64. }

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