how can i use timer as counter??

RE: how can i use timer as counter??

HYuan — Mon, 13 Nov 2017 14:17:11 GMT

Hello, do you still have the code? it would be nice if you could send it to me. Thanks!

RE: how can i use timer as counter??

Rokas — Thu, 08 Dec 2016 13:33:03 GMT

Hello, could you share the sample code? It would help me too, thanks

RE: how can i use timer as counter??

wlgrd — Mon, 28 Mar 2016 15:23:05 GMT

Will try to provide some when I am back at my computer tomorrow

RE: how can i use timer as counter??

wooyongKim — Mon, 28 Mar 2016 14:21:01 GMT

can i get some example code?? thanks..

RE: how can i use timer as counter??

wlgrd — Mon, 28 Mar 2016 11:32:30 GMT

Much smarter than my previous answer, don't know what I was thinking, but the concept is almost the same.

Use gpiote with event on rising edge, connect the event to timer start with ppi, connect falling edge gpiote event to timer stop and read the value. You can also connect the same event (stop event) to timer capture so the timer value resides in a CC register until you clear it.

RE: how can i use timer as counter??

wooyongKim — Mon, 28 Mar 2016 11:19:50 GMT

hi, it will start with rising edge from PWM and stop with falling edge. i want to measure the time gap of it.

RE: how can i use timer as counter??

wlgrd — Wed, 23 Mar 2016 21:42:52 GMT

Using nrf_drv_timer should work. The counter is just setting the timer mode to counter and trigger the COUNT task. You can set up the pwm pin toggle to actually trigger the count task of a timer through GPIOTE and PPI. Connect the PWM pin to a GPIOTE event. Through PPI, connect the GPIOTE event to the TIMER COUNTER task for any timer. When you are starting the measurement, you have set up another timer in timer mode, which you will start by setting the TIMER START task. When stopping, disable the PPI that counts the PWM and set the TIMER STOP task. Then you have a value for how long time you have done the measurement, and how many transitions the PWM has done during this time.

RE: how can i use timer as counter??

wlgrd — Wed, 23 Mar 2016 21:38:18 GMT

how long do you need to measure the frequency? Do you use a button or anything to start the measurement or will it do it continously? When will you stop the measurement?