LPC Microcontrollers中的主题 Re: Pulse counter using Timer

Pulse counter using Timer

rajani_sureja33 — Wed, 22 Mar 2017 12:51:52 GMT

Is it possible to use timer to count the pulses ??? if yes then how??

Re: Pulse counter using Timer

soledad — Wed, 22 Mar 2017 22:07:34 GMT

Hello,

Could you please mention the device you are using?

Regards

Sol

Re: Pulse counter using Timer

soledad — Thu, 23 Mar 2017 00:24:43 GMT

Please check the below thread and let me know if this helps.

Any example to use CAPTURE PINS as pulse counters? | www.LPCware.com

Have a great day,
Sol

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Re: Pulse counter using Timer

rajani_sureja33 — Thu, 13 Apr 2017 06:46:07 GMT

we are using lpc1833 on P1.0

Re: Pulse counter using Timer

rajani_sureja33 — Fri, 14 Apr 2017 06:42:30 GMT

I am using Timer0 to generate an interrupt at every 1sec and I am reading capture value at pin 1.0 to count value of rpm. is it a right way to measure the rpm of fan?

But, I m still not getting actual rpm reading on this pin.

Can you please advice me asap?

Re: Pulse counter using Timer

rajani_sureja33 — Fri, 14 Apr 2017 06:45:13 GMT

This is the P1.0 (Timer1/capture1) initialization code for rpm reading.

TIM_COUNTERCFG_Type TIM_FanspeedTimerConfig;
TIM_CAPTURECFG_Type TIM_FanspeedCaptureConfig;

TIM_FanspeedCaptureConfig.CaptureChannel = TIM_COUNTER_INCAP1;
TIM_FanspeedCaptureConfig.RisingEdge = ENABLE;
TIM_FanspeedCaptureConfig.FallingEdge = DISABLE;
TIM_FanspeedCaptureConfig.IntOnCaption = DISABLE;

TIM_ConfigCapture(LPC_TIMER1,&TIM_FanspeedCaptureConfig);
TIM_ResetCounter(LPC_TIMER1);

TIM_Cmd(LPC_TIMER1,ENABLE);

Re: Pulse counter using Timer

rajani_sureja33 — Fri, 14 Apr 2017 06:47:24 GMT

Instant help will be appreciated:smileyhappy:

Re: Pulse counter using Timer

rajani_sureja33 — Wed, 19 Apr 2017 11:30:16 GMT

I am getting the pclk freq but don't get external input freq, Can anyone suggest me what has been remained to select external input on this pin?.