LPC MicrocontrollersのトピックRe: Overflow problem with SCTimer/PWM using capture registers.

Overflow problem with SCTimer/PWM using capture registers.

anto — Thu, 26 Aug 2021 08:42:43 GMT

Hi,

I have been running code on a lpc845 using the SCTimer/PWM peripheral.

I need to capture and read the pulse from 4 different sources.
I have used the following technique to measure the pulse:
capture the counter value on the rising edge of the pulse, then capture the counter value on the falling edge of the pulse and do the difference to get the real value of the pulse.
The system works but when the counter comes to overflow I clearly do not have the exact reading of the pulse anymore. Does anyone have any idea how to solve this issue?

Re: Overflow problem with SCTimer/PWM using capture registers.

Alice_Yang — Thu, 26 Aug 2021 09:26:06 GMT

Same question with https://community.nxp.com/t5/LPC-Microcontrollers/How-to-raise-event-in-sctimer-pwm-lpc845-when-counter-goes-in/td-p/1330129

Re: Overflow problem with SCTimer/PWM using capture registers.

anto — Thu, 26 Aug 2021 16:05:51 GMT

hi
I used all 8 events to detect the fronts of 4 pulses to read the pulse_width, how can I detect a match?

Re: Overflow problem with SCTimer/PWM using capture registers.

Alice_Yang — Fri, 27 Aug 2021 02:00:54 GMT

If that, there is no method.