Launchpad Port C6 don't trigger interrupt

Hello Jose,

I tested the code on the TM4C123 launchPad and PC6 does generate an interrupt on Falling Edge.

I had to make some code changes as below (since it seemed you were using an older release of TivaWare)

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

    GPIOIntRegister(GPIO_PORTA_BASE, PortAIntHandler);
    GPIOIntRegister(GPIO_PORTC_BASE, PortCIntHandler);
    GPIOIntRegister(GPIO_PORTD_BASE, PortDIntHandler);

    GPIOPinTypeGPIOInput(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4);
    GPIOPinTypeGPIOInput(GPIO_PORTC_BASE, GPIO_PIN_6);
    GPIOPinTypeGPIOInput(GPIO_PORTD_BASE, GPIO_PIN_6);

    GPIOPadConfigSet ( GPIO_PORTA_BASE , GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );//
    GPIOPadConfigSet ( GPIO_PORTC_BASE , GPIO_PIN_6 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );
    GPIOPadConfigSet ( GPIO_PORTD_BASE , GPIO_PIN_6 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );

    GPIOIntTypeSet(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4, GPIO_FALLING_EDGE);//
    GPIOIntTypeSet(GPIO_PORTC_BASE, GPIO_PIN_6, GPIO_FALLING_EDGE);
    GPIOIntTypeSet(GPIO_PORTD_BASE, GPIO_PIN_6, GPIO_FALLING_EDGE);

    GPIOIntEnable(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4);
    GPIOIntEnable(GPIO_PORTC_BASE, GPIO_PIN_6);
    GPIOIntEnable(GPIO_PORTD_BASE, GPIO_PIN_6);

    GPIOIntClear(GPIO_PORTA_BASE , GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 );
    GPIOIntClear(GPIO_PORTC_BASE , GPIO_PIN_6 );
    GPIOIntClear(GPIO_PORTD_BASE , GPIO_PIN_6 );

    IntEnable (INT_GPIOA);
    IntEnable (INT_GPIOC);
    IntEnable (INT_GPIOD);

    IntMasterEnable();

Regards

Amit

Highlighting of any/all changes would have better revealed them....

edit: we note now - post above has (properly) highlighted (3 areas) the corrected code blocks...  Makes recognition/understanding so much easier...

Hi Amit,

I have just updated Tivaware to last release, but i have same problem with interrupt PC6. I have tested another Port C pins, and doesn't   trigger the interrupt. Can it be a problem with my launchpad module?  or problem with port C? I have changed a switch of Port A, that it works fine, and connected it to pin PC6 or another Port C pins and anything doesn't trigger interrupt.

regards,

Jose

Hello Jose,

It would be hard to believe that Port C Pins are gone (JTAG is still working). If you have another LaunchPad it may be worthwhile testing it on a second one.

BTW, PC0-3 will not work without unlocking the pin, but using them as GPIO would cause you to lose the JTAG.

Regards

Amit

Amit,

i can not see the problem. I have programing a simple sample. I have configured a interrupt in PA3 to change value pin of serveral pins.  I have configured pin PA5, port C pins (4 to 7), port D pins (0 to 3, 6 and 7) and port F (0 to 4) as a OUTPUT with pinmux tool.

Only pin PA5 change value. Other pins don't change value.

I send you attached zip project (launchpad). There is any problem with configuration project? or ports C, D and F configuration? libraries versions? 

Tiva release software: TivaWare_C_Series-2.1.0.12573

8540.launchpad.zip 

Hello Jose

I ran the code you had and the Port C Pins changed the value from 0 to 1, when PA3 is connected to GND (falling edge)

Before PA3 falling edge

After PA3 Falling Edge

Regards

Amit

Hi Amit,

last chance for my code...

I have just test my code with another new launchpad... Doesn't work interrupt PC6 pin port :-(

I send you attached the project... Is possible any problem with configuration project? includes, libraries, etc...?

Is there another way to test interrupt ?

1803.interrupts.zip

regards

Jose Manuel

Hello Jose,

I can try using your CCS project to see if there is a generic issue or not. I will update as soon as I have some results

Regards

Amit

Hi Amit,

Have you been able to test the project I sent you? Can I send you more information about my CCS configuration?

I am waiting for your reply to choose the development platform.

Regards,

Jose Manuel

Hello Jose

Sorry for the delay. What I saw in the code is a logical problem. But before I get to that I just want to confirm the connection. What I have done is connected the PA5 to PC6 through a wire. Is that what you have on your side?

Problem: The PA5 is configured as output. The default register content for the GPIODATA is 0x0. Hence it drives as 0.

    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_5);

So when the read is done it will read as 0 and invert the same to 1. This will not generate a falling edge.

I modified the code as

    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_5);

    GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, GPIO_PIN_5);

and after that it started going to the interrupt handler for PC6

/*
 * main.c
 */
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/tm4c123gh6pm.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"



void PortAIntHandler(void)
{
	GPIOIntClear(GPIO_PORTA_BASE , GPIO_PIN_3 );

	int readPin = GPIOPinRead(GPIO_PORTA_BASE,GPIO_PIN_5);

	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, ~readPin);

}

void PortCIntHandler(void)
{
	GPIOIntClear(GPIO_PORTC_BASE , GPIO_PIN_6 );

	int readPin = GPIOPinRead(GPIO_PORTA_BASE,GPIO_PIN_5);

	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, ~readPin);

}

void PortDIntHandler(void)
{
	GPIOIntClear(GPIO_PORTD_BASE , GPIO_PIN_6 );

	int readPin = GPIOPinRead(GPIO_PORTA_BASE,GPIO_PIN_5);

	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, ~readPin);
}



void main(void){

	SysCtlClockSet (SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_5);
    GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, GPIO_PIN_5);

    GPIOPinTypeGPIOInput(GPIO_PORTA_BASE, GPIO_PIN_3);
    GPIOPinTypeGPIOInput(GPIO_PORTD_BASE, GPIO_PIN_6);
	GPIOPinTypeGPIOInput(GPIO_PORTC_BASE, GPIO_PIN_6);

	GPIOPadConfigSet( GPIO_PORTA_BASE , GPIO_PIN_3 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );
	GPIOPadConfigSet( GPIO_PORTC_BASE , GPIO_PIN_6 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );
	GPIOPadConfigSet( GPIO_PORTD_BASE , GPIO_PIN_6 , GPIO_STRENGTH_2MA , GPIO_PIN_TYPE_STD_WPU );

	GPIOIntTypeSet(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_FALLING_EDGE);
	GPIOIntTypeSet(GPIO_PORTC_BASE, GPIO_PIN_6, GPIO_FALLING_EDGE);
	GPIOIntTypeSet(GPIO_PORTD_BASE, GPIO_PIN_6, GPIO_FALLING_EDGE);

	GPIOIntEnable(GPIO_PORTA_BASE, GPIO_PIN_3);
	GPIOIntEnable(GPIO_PORTC_BASE, GPIO_PIN_6);
	GPIOIntEnable(GPIO_PORTD_BASE, GPIO_PIN_6);

	IntMasterEnable();

	IntEnable(INT_GPIOA);
	IntEnable(INT_GPIOC);
	IntEnable(INT_GPIOD);

	int readPin = GPIOPinRead(GPIO_PORTA_BASE,GPIO_PIN_5);
	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_5, ~readPin);

	while(1)
	{

	}
}

Regards

Amit