topic Can't get group interrupt to work on port 2 (LPC1549) in LPC Microcontrollers

Can't get group interrupt to work on port 2 (LPC1549)

marcokuysterman — Thu, 28 Feb 2019 16:10:12 GMT

I want to use port 2.4 to be part of the group interrupt 0:

 Chip_GPIOGP_Init(LPC_GPIOGROUP);         
 Chip_GPIO_SetPinDIRInput(LPC_GPIO, 2, 4);
 Chip_GPIOGP_SelectHighLevel(LPC_GPIOGROUP, 0 ,2, 1 << 4);   
 Chip_GPIOGP_EnableGroupPins(LPC_GPIOGROUP, 0, 2, 1 << 4);
 Chip_GPIOGP_SelectOrMode(LPC_GPIOGROUP, 0);
 Chip_GPIOGP_SelectEdgeMode(LPC_GPIOGROUP, 0);
 Chip_GPIOGP_ClearIntStatus(LPC_GPIOGROUP, 0);
 NVIC_EnableIRQ(GINT0_IRQn);
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

However when I look at PORT_POL[2] and PORT_ENA[2] both are 0 and stay 0. If I change the code to port 1.4, the value for PORT_POL[1] = 0xFFFF FFFF and PORT_ENA[1] = 0x0001 0000. Am I missing something?

Re: Can't get group interrupt to work on port 2 (LPC1549)

Alice_Yang — Fri, 01 Mar 2019 07:22:13 GMT

Hello Marco Kuystermans,

Please check whether enable GPIO2 clock :

Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO2);

and whether set pin back to GPIO :

STATIC INLINE void Chip_IOCON_PinMuxSet(LPC_IOCON_T *pIOCON, uint8_t port, uint8_t pin, uint32_t modefunc)

I recommend you first try to the demo "periph_grouped_int" under LPCopen:

LPCOpen Software for LPC15XX | NXP

Have a great day,
TIC

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Re: Can't get group interrupt to work on port 2 (LPC1549)

marcokuysterman — Mon, 04 Mar 2019 16:35:45 GMT

Thank you for you answer.

I tried both suggestions but still PORT_POL[2] and PORT_ENA[2] are 0 and stay 0. No change.

I also looked at your example but I do not see any clues why

As a workaround I am polling port 2.4, but imho an interrupt will fit much better.

Greetings Marco

Re: Can't get group interrupt to work on port 2 (LPC1549)

Alice_Yang — Tue, 05 Mar 2019 07:16:32 GMT

Hello Marco,

I will test it on my side after I get this board.

How about the demo "periph_grouped_int"?

This default demo is for Port0, pin 17, Select Low Level interrupt on this pin :

/* GPIO pin for GROUPED GPIO interrupt. This is SW1-WAKE button switch input. */
#define TEST_BUTTON_PIN         17   /* GPIO pin number mapped to PININT */
#define TEST_BUTTON_PORT        0   /* GPIO port number mapped to PININT */
    Chip_GPIOGP_SelectLowLevel(LPC_GPIOGROUP, 0, TEST_BUTTON_PORT, 1 << TEST_BUTTON_PIN);

after download it ,check the register of PORT_POL[0], bit 17.

Then change to port2- pin4, how about the register of PORT_POL[2] ?

Have a great day,
TIC

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Re: Can't get group interrupt to work on port 2 (LPC1549)

marcokuysterman — Mon, 02 Nov 2020 14:16:33 GMT

Sorry for my late answer, but here are the results of my tests:

In case of pin 0.17:

 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO2);
 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GPIO0);
 Chip_GPIOGP_Init(LPC_GPIOGROUP);
 Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 17, (IOCON_DIGMODE_EN | IOCON_MODE_INACT) );;
 Chip_GPIO_SetPinDIRInput(LPC_GPIO, 0, 17);

 #define TEST_BUTTON_PIN 17 /* GPIO pin number mapped to PININT */
 #define TEST_BUTTON_PORT 0 /* GPIO port number mapped to PININT */

  Chip_GPIOGP_SelectLowLevel(LPC_GPIOGROUP, 0, TEST_BUTTON_PORT, 1 << TEST_BUTTON_PIN);

Result:

And indeed the pin polarity is set correctly.

In case of pin 2.4:

But now the whole register stays 0 (POL[0] and POL[1] are both Binary:11111111111111111111111111111111)

I am confused, the only conclusion I can make is that this whole thing does not work for Port 2.

Greetings Marco

Re: Can't get group interrupt to work on port 2 (LPC1549)

Alice_Yang — Thu, 14 Mar 2019 10:12:21 GMT

Hello Marco Kuystermans，

Please check how many pins in your chip refer to Data sheet, or you can tell me the part number , I help you check it.

If 48 pins or 64 pins, there isn't GPIO port 2, only 100 pin chip have:

Hope it helps,

Have a great day,
TIC

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Re: Can't get group interrupt to work on port 2 (LPC1549)

marcokuysterman — Thu, 14 Mar 2019 12:58:31 GMT

Alice,

good thinking, but I am using the LPC1549JBD100 which is a 100 pin device.

Greetings, Marco