topic Re: Configure lpc4337 timer0 as input capture in LPC Microcontrollers

Configure lpc4337 timer0 as input capture

matiasalvarez — Fri, 07 Oct 2016 22:17:35 GMT

Hello, i'm trryng to configure lpc4337 timer0 as input capture to capture both rising and falling edges. It's still not working. Can you help me?. Here is my code:

#define TIMER_NUMBER 0

#define CAP_NUMB 3

#define TIMER0_PRESCALER 10

#define IC_SCU_PORT 1

#define IC_SCU_PIN 17

#define LPC_TIMER LPC_TIMER0

#define RGU_TIMER_RST RGU_TIMER0_RST

#define LPC_TIMER_IRQ TIMER0_IRQn

#define INPUT 0

#define OUTPUT 1

#define ON 1

#define OFF 0

volatile uint8_t STATUS=0;

__attribute__ ((section(".after_vectors")))

void TIMER0_IRQHandler(void){

if (STATUS == 0)

STATUS=1;

else

STATUS=0;

}

int main(void)

{

SystemCoreClockUpdate();

ledConfig();

Chip_SCU_PinMuxSet(IC_SCU_PORT, IC_SCU_PIN, SCU_MODE_FUNC4);

Chip_TIMER_Init(LPC_TIMER);

LPC_GIMA->CAP0_IN[TIMER_NUMBER][CAP_NUMB] = (1<<4);

Chip_RGU_TriggerReset(RGU_TIMER_RST);

while (Chip_RGU_InReset(RGU_TIMER_RST));

Chip_TIMER_Reset(LPC_TIMER);

Chip_TIMER_TIMER_SetCountClockSrc(LPC_TIMER, TIMER_CAPSRC_RISING_PCLK, CAP_NUMB);

Chip_TIMER_PrescaleSet(LPC_TIMER, TIMER0_PRESCALER);

Chip_TIMER_ClearCapture(LPC_TIMER, CAP_NUMB);

Chip_TIMER_CaptureRisingEdgeEnable(LPC_TIMER, CAP_NUMB);

Chip_TIMER_CaptureFallingEdgeEnable (LPC_TIMER, CAP_NUMB );

Chip_TIMER_CaptureEnableInt(LPC_TIMER, CAP_NUMB);

NVIC_ClearPendingIRQ(LPC_TIMER_IRQ);

NVIC_EnableIRQ(LPC_TIMER_IRQ);

Chip_TIMER_Enable(LPC_TIMER);

while(1) {

ledSet(STATUS);

}

return 0;

}

Thank you, Matias

Re: Configure lpc4337 timer0 as input capture

jeremyzhou — Tue, 11 Oct 2016 09:35:57 GMT

Hi,

Just recommend, I'm working now and I will inform ASAP if I figure the root cause of the issue.
Have a great day,
Ping

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Re: Configure lpc4337 timer0 as input capture

jeremyzhou — Wed, 12 Oct 2016 06:39:25 GMT

Hi Matias Alvarez,

About your demo, using the following the code to replace the " Chip_SCU_PinMuxSet(IC_SCU_PORT, IC_SCU_PIN, SCU_MODE_FUNC4);"

Chip_SCU_PinMux(IC_SCU_PORT,IC_SCU_PIN, MD_PLN_FAST, SCU_MODE_FUNC4);

I've also create a demo for LPCXpresso4337 board which toggles the P1.5 in the Timer1 interrupt and set the P1.12 work as the T0_CAP1 to receive the PWM wave.

When testing the demo, use a wire connect the P1.5 and P1.12, and after enter into the Timer0 interrupt, it will toggle the blue led (Fig 1).

Have a great day,
Ping