Hi, I have to count pulses by LPC1768. I try to use port P0.24 with
function CAP3.1 to driving Timer3 as counter.

Example of timer3 configuration:

//   counter 3
   const unsigned long TCR_COUNT_RESET = 2, TCR_COUNT_ENABLE = 0x01;
   LPC_SC->PCONP |= (1 << 23);
   LPC_TIM3->TCR = TCR_COUNT_RESET;
   LPC_TIM3->CTCR = 0x101;
   LPC_TIM3->TCR = TCR_COUNT_ENABLE;

And port definition:

   LPC_PINCON->PINSEL1 |= (1 << 17) | (1 << 16); // set pin P0.24 as CAP3.1
   LPC_GPIO0->FIODIR &=~(1<<24);         // set pin P0.24 as input

And LPC_TIM3->TC not change.
If I configure Timer3 with PCLK as source is OK. When i use P0.24 as
input pin is also ok. I can count level changes in main loop. But why
not work counting pulses by timer/counter functionality?
Maybe I have to match any register more?

Regards

>LPC_TIM3->CTCR = 0x101;
0x101 is 0b100000001, but bits 31:4 in CTCR are reserved. You probably
wanted 0b101, which is 0x5. With that configuration you use CAP3.0 and
not CAP3.1 as input. If I'm right with my assumption this is a good
example why one shouldn't use magic numbers in sourcecode and use easy
readable defines instead (or use bit shifts). Mixing this in one file is
also a dangerous thing ...