Using timer 5 channel 2 input capture acquisition frequency information, using the timer 4 timing, frequency information is provided by the PWM output timer 3, when the timer enters the timer interrupt, output capture frequency information, and open the next frequency acquisition, present a problem, when in capture counter variable in a function after a add output, output information and set up the same in the interrupt (have certain error, 4 once every 500 ms into the interrupt, timer timer 3 output PWM frequency 2 k), when output is commented, the interrupt function of the output is completely without any reason, the result is shown in figure, how is this to return a responsibility excuse me, how should deal with