Measuring Pulse width - Electronic Circuits Projects Diagrams Free

autaorte · 2nd October 2007, 06:33 PM

How i do for measuring Pulse Width in C langue? (Pic 16f628A)

Any guy have a example?

boxer4 · 3rd October 2007, 01:55 AM

I've never seriously messed with 16F628A interrupts to measure pulse widths, but for a AVR I'd set an interrupt pin to trigger on both edges, and simply measure how many clock ticks with a timer it stays in each state.

For the 628A it looks like PORTB has an interrupt option on state change. You can probably use one of portb 7:4 to do something similar.

If you're out of resources you may have to use a tight loop to check if the port changed state or not, I'd probably avoid this method unless the pulse widths are quite a bit longer than several instruction cycle time.

DavidT · 3rd October 2007, 02:23 PM

I have a few examples measuring 1 to 2ms pulses on my site. See 'pulse width', 'port mirror', 'lvc1' and 'lvc2' here: http://www.flyelectric.ukgateway.net...buildingblocks
Regards, David.

Pommie · 3rd October 2007, 02:38 PM

The hardware will do it for you. Read the section in the data sheet on the CCP module.

Mike.

2nd October 2007, 06:33 PM	(permalink)
autaorte New Member	Measuring Pulse width How i do for measuring Pulse Width in C langue? (Pic 16f628A) Any guy have a example? Last edited by autaorte; 2nd October 2007 at 06:35 PM.

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3rd October 2007, 01:55 AM	(permalink)
boxer4 Experienced Member	I've never seriously messed with 16F628A interrupts to measure pulse widths, but for a AVR I'd set an interrupt pin to trigger on both edges, and simply measure how many clock ticks with a timer it stays in each state. For the 628A it looks like PORTB has an interrupt option on state change. You can probably use one of portb 7:4 to do something similar. If you're out of resources you may have to use a tight loop to check if the port changed state or not, I'd probably avoid this method unless the pulse widths are quite a bit longer than several instruction cycle time.

3rd October 2007, 02:23 PM	(permalink)
DavidT New Member	I have a few examples measuring 1 to 2ms pulses on my site. See 'pulse width', 'port mirror', 'lvc1' and 'lvc2' here: http://www.flyelectric.ukgateway.net...buildingblocks Regards, David.

3rd October 2007, 02:38 PM	(permalink)
Pommie Experienced Member	The hardware will do it for you. Read the section in the data sheet on the CCP module. Mike.