溢出次数如何获取呢

我也是用PE生产的

Well, I would use something like input capture method. The idea is:

- enable the free running timer (TIM)

- at the start save the current value of timer count register TCNT

(first_value)

- enable the timer overflow interrupt

- count the overflow interrupts (overflows++)

- at the end save the current value of TCNT (second_value)

- now calculate the interval: (0x10000 - first_value) + (overflows *

0x10000) + second_value

If the timer didn't overflow then it's simple: second_value -

first_value

It will be necessary to find out appropriate timer prescaler (I don't

know what intervals you want to measure). 

In fact, this method can be used also for ISR's length measuring. But

there's problem with the timer overflow interrupt as I wrote in my

previous reply. If the length of ISR is not greater than the period

between two overflows then I can imagine this method:

interrupt void test(void)

{

				TFLG2_TOF = 1;
				//clear timer overflow flag (interrupt is

disabled)

first_value = TCNT;

				//do something here
				

				second_value = TCNT;

				if(TFLG2_TOF == 1)

				length = 0x10000 - first_value + second_value;

				else

				length = second_value - first_value

}