using STR710 timer1 to count external pulses

aialinux · ‎2006-04-10

Posted on April 10, 2006 at 09:39

aialinux · ‎2006-04-07

Posted on April 08, 2006 at 01:46

I am using STR710 timer1 to count external pulses.

When the timer1 Overflow,It can't jump to the IRQHandler.I don't know why!

// try to make sure that timer1 is in ''normal'' mode

// Initialize the Timer 1

TIM_Init ( TIM1 );

TIM_ClockSourceConfig ( TIM1, TIM_EXTERNAL );//TIM_EXTERNAL

TIM_ClockLevelConfig ( TIM1, TIM_RISING ); // TIM_FALLING

TIM_ITConfig(TIM1, TIM_TO_IT, ENABLE);

GPIO_Config (GPIO1, 0x0010, GPIO_IN_TRI_CMOS);//pin 1.4,extclk

[ This message was edited by: dom on 08-04-2006 10:57 ]

cgrun · ‎2006-04-09

Posted on April 10, 2006 at 06:15

You need to add some statement:

TIM_CounterConfig(TIM1,TIM_START); //Start counting

TIM_FlagClear(TIM1, TIM_TOF); //Clear overflow flag

TIM_ITConfig(TIM1,TIM_TOF,ENABLE); //enable this int (overflow).

remove your line:

TIM_ITConfig(TIM1, TIM_TO_IT, ENABLE);

in your int, you need to call:

TIM_FlagClear(TIM1, TIM_TOF); //Clear overflow flag.

Chris.

aialinux · ‎2006-04-10

Posted on April 10, 2006 at 09:39

I found some strange! When I using TIM0 for periodic timer interrupt and TIM1 to count external pulses,It only respond the TIM0 periodic interrupt .

TIM1 Overflow interrupt never respond.

When I just using TIM1 to count external pulses,it can jump to the ISR.