LPC MicrocontrollersのトピックRe: SCTIMER event not triggering on input (LPC824)

SCTIMER event not triggering on input (LPC824)

jamesward0001 — Tue, 17 Sep 2019 07:54:54 GMT

Hi, I'm trying to use the SCTIMER module in my LPC824 to time input signals so i can decode them. I've managed to get match events to work, however I can't seem to get input events working. I've set up my event using your sdk like so:

if(SCTIMER_CreateAndScheduleEvent(SCTIMER_1_PERIPHERAL, kSCTIMER_InputRiseEvent, 0, kSCTIMER_Input_1, kSCTIMER_Counter_L, &SCTimer_1_event[0]) == kStatus_Fail){
USART_WriteBlocking(USART0, riseEventFailMsg,35);
}

but it doesn't seem to trigger (i have both a capture and led output set to activate when the event triggers, i know they work with match events). I suspect the most likely candidate is a faulty config in pinmux.c but I can't find anything wrong, here's the relevant parts out of pinmux as well:

/* SCT_PIN0. Assign to pin using the switch matrix 1 */
INPUTMUX_AttachSignal(INPUTMUX, 1U, kINPUTMUX_SctPin0ToSct0);
/* SCT_PIN0 connect to P0_2 */
SWM_SetMovablePinSelect(SWM0, kSWM_SCT_PIN0, kSWM_PortPin_P0_2);

Anyone got any ideas?

Thanks,

James

Re: SCTIMER event not triggering on input (LPC824)

Alice_Yang — Wed, 18 Sep 2019 03:35:04 GMT

Hello James Ward,

Could you please share your whole project, also tell me the detail steps to reproduce your issue.

Alice

Re: SCTIMER event not triggering on input (LPC824)

jamesward0001 — Wed, 18 Sep 2019 09:39:51 GMT

Hiya, attached is the project which at the moment should capture the timer value at rise and fall edges on input P0_2 (SCT input0), it should return these values over serial. it should also blink an LED attached to pin P0_11 on reception of any pulses on that pin (I'm using a custom PCB, not a dev board). However, the rise and fall events never trigger (no led blink and capture reg remains at 0) no matter what inputs i give them. I know the output works because i can blink it with a match event and I have managed to get the input working using PINT and GPIO so I know my input signal is fine.

So, steps to reproduce the problem are to try and create an input triggered event on input 0 using the MCUxpresso config tool, then trigger that event with an input and see what happens. I think it's most likely my input config is incorrect but I don't know in what way or why.

Thanks, fingers crossed it's just me being silly.

James

EDIT: just realised that i forgot to init INPUTMUX, have now done so but it still doesn't work :smileysad:

EDIT2: Electric Boogaloo : I tried it with a different Pin and it worked perfectly. so it looks like his SCT stuff isn't working specifically on that pin however I can still detect GPIO and PINT events on that pin so I have no idea what's causing this. Are there some pins SCT doesn't work for?