Capturing the PPM signal and displaying in hyperterminal
Posted: Thu Jul 25, 2013 3:34 am
by Divya
Hi,
I am using LPC1768. Now i need to capture a PPM signal in GPIO pin and i want to display in the hyperterminal. Plz help me in programming.
Thank You
Re: Capturing the PPM signal and displaying in hyperterminal
Posted: Thu Jul 25, 2013 4:58 am
by skimask
Divya wrote:Hi,
I am using LPC1768. Now i need to capture a PPM signal in GPIO pin and i want to display in the hyperterminal. Plz help me in programming.
There it is again!
Re: Capturing the PPM signal and displaying in hyperterminal
Posted: Thu Jul 25, 2013 5:55 am
by fll-freak
PPM? Pulse Per Minute, Pages Per Minute, Peak Program Meter, Perl Package Manager, ...?
Assuming this was a type and should have been PWM, then what is the range of frequencies and duty cycles? How about the voltage level? How often do the "hyperterminal" need to be updated? What sort of accuracy do you need? What is to be displayed frequency, duty cycle, on/off time, or something else? How fast is your CPU clocked? Must it be a GPIO pin and not one of the hardware interrupt pins? What resources are free for use like timers? What is the source of the 'PMM' signal? Have you read the datasheet? What toolchain are you using? What is your experience level?
Good questions get answers.
Re: Capturing the PPM signal and displaying in hyperterminal
Posted: Fri Jul 26, 2013 12:08 pm
by Valen
There's also Pulse Position Modulation. Where the information is carried in timeshifts of pulses. You would need a timer behind the GPIO pin that measures how far the pulses are apart.
http://en.wikipedia.org/wiki/Pulse-position_modulation