TM4C1294NCPDT: Not generating an interrupt

Marwa Safa

Part Number: TM4C1294NCPDT

I've been following the Getting Started with the Tiva™ TM4C123G LaunchPad Workshop and in lab 4, it shows you how to generate an interrupt, however it doesn't seem to be working for me. Does anyone know what I did wrong looking at this code?

Here is the main code:

#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c1294ncpdt.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"

int main(void)
{
uint32_t ui32Period;

SysCtlClockSet(
SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ
| SYSCTL_OSC_MAIN);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_0);

SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);

ui32Period = (SysCtlClockGet() / 10) / 2;
TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period - 1);

IntEnable(INT_TIMER0A);
TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
IntMasterEnable();

TimerEnable(TIMER0_BASE, TIMER_A);

while (1)
{
}
}

void Timer0IntHandler(void)
{
// Clear the timer interrupt
TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

// Read the current state of the GPIO pin and
// write back the opposite state
if (GPIOPinRead(GPIO_PORTF_BASE, 0))
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, 1);
}
else
{
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, 0);
}
}

Here is the startup code:

//*****************************************************************************
//
// Startup code for use with TI's Code Composer Studio.
//
// Copyright (c) 2011-2014 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
//*****************************************************************************

#include <stdint.h>

//*****************************************************************************
//
// Forward declaration of the default fault handlers.
//
//*****************************************************************************
void ResetISR(void);
static void NmiSR(void);
static void FaultISR(void);
static void IntDefaultHandler(void);

//*****************************************************************************
//
// External declaration for the reset handler that is to be called when the
// processor is started
//
//*****************************************************************************
extern void _c_int00(void);
extern void Timer0IntHandler(void);

//*****************************************************************************
//
// Linker variable that marks the top of the stack.
//
//*****************************************************************************
extern uint32_t __STACK_TOP;

//*****************************************************************************
//
// External declarations for the interrupt handlers used by the application.
//
//*****************************************************************************
// To be added by user

//*****************************************************************************
//
// The vector table. Note that the proper constructs must be placed on this to
// ensure that it ends up at physical address 0x0000.0000 or at the start of
// the program if located at a start address other than 0.
//
//*****************************************************************************
#pragma DATA_SECTION(g_pfnVectors, ".intvecs")
void (* const g_pfnVectors[])(void) =
{
(void (*)(void))((uint32_t)&__STACK_TOP),
// The initial stack pointer
ResetISR, // The reset handler
NmiSR, // The NMI handler
FaultISR, // The hard fault handler
IntDefaultHandler, // The MPU fault handler
IntDefaultHandler, // The bus fault handler
IntDefaultHandler, // The usage fault handler
0, // Reserved
0, // Reserved
0, // Reserved
0, // Reserved
IntDefaultHandler, // SVCall handler
IntDefaultHandler, // Debug monitor handler
0, // Reserved
IntDefaultHandler, // The PendSV handler
IntDefaultHandler, // The SysTick handler
IntDefaultHandler, // GPIO Port A
IntDefaultHandler, // GPIO Port B
IntDefaultHandler, // GPIO Port C
IntDefaultHandler, // GPIO Port D
IntDefaultHandler, // GPIO Port E
IntDefaultHandler, // UART0 Rx and Tx
IntDefaultHandler, // UART1 Rx and Tx
IntDefaultHandler, // SSI0 Rx and Tx
IntDefaultHandler, // I2C0 Master and Slave
IntDefaultHandler, // PWM Fault
IntDefaultHandler, // PWM Generator 0
IntDefaultHandler, // PWM Generator 1
IntDefaultHandler, // PWM Generator 2
IntDefaultHandler, // Quadrature Encoder 0
IntDefaultHandler, // ADC Sequence 0
IntDefaultHandler, // ADC Sequence 1
IntDefaultHandler, // ADC Sequence 2
IntDefaultHandler, // ADC Sequence 3
IntDefaultHandler, // Watchdog timer
Timer0IntHandler, // Timer 0 subtimer A
IntDefaultHandler, // Timer 0 subtimer B
IntDefaultHandler, // Timer 1 subtimer A
IntDefaultHandler, // Timer 1 subtimer B
IntDefaultHandler, // Timer 2 subtimer A
IntDefaultHandler, // Timer 2 subtimer B
IntDefaultHandler, // Analog Comparator 0
IntDefaultHandler, // Analog Comparator 1
IntDefaultHandler, // Analog Comparator 2
IntDefaultHandler, // System Control (PLL, OSC, BO)
IntDefaultHandler, // FLASH Control
IntDefaultHandler, // GPIO Port F
IntDefaultHandler, // GPIO Port G
IntDefaultHandler, // GPIO Port H
IntDefaultHandler, // UART2 Rx and Tx
IntDefaultHandler, // SSI1 Rx and Tx
IntDefaultHandler, // Timer 3 subtimer A
IntDefaultHandler, // Timer 3 subtimer B
IntDefaultHandler, // I2C1 Master and Slave
IntDefaultHandler, // CAN0
IntDefaultHandler, // CAN1
IntDefaultHandler, // Ethernet
IntDefaultHandler, // Hibernate
IntDefaultHandler, // USB0
IntDefaultHandler, // PWM Generator 3
IntDefaultHandler, // uDMA Software Transfer
IntDefaultHandler, // uDMA Error
IntDefaultHandler, // ADC1 Sequence 0
IntDefaultHandler, // ADC1 Sequence 1
IntDefaultHandler, // ADC1 Sequence 2
IntDefaultHandler, // ADC1 Sequence 3
IntDefaultHandler, // External Bus Interface 0
IntDefaultHandler, // GPIO Port J
IntDefaultHandler, // GPIO Port K
IntDefaultHandler, // GPIO Port L
IntDefaultHandler, // SSI2 Rx and Tx
IntDefaultHandler, // SSI3 Rx and Tx
IntDefaultHandler, // UART3 Rx and Tx
IntDefaultHandler, // UART4 Rx and Tx
IntDefaultHandler, // UART5 Rx and Tx
IntDefaultHandler, // UART6 Rx and Tx
IntDefaultHandler, // UART7 Rx and Tx
IntDefaultHandler, // I2C2 Master and Slave
IntDefaultHandler, // I2C3 Master and Slave
IntDefaultHandler, // Timer 4 subtimer A
IntDefaultHandler, // Timer 4 subtimer B
IntDefaultHandler, // Timer 5 subtimer A
IntDefaultHandler, // Timer 5 subtimer B
IntDefaultHandler, // FPU
0, // Reserved
0, // Reserved
IntDefaultHandler, // I2C4 Master and Slave
IntDefaultHandler, // I2C5 Master and Slave
IntDefaultHandler, // GPIO Port M
IntDefaultHandler, // GPIO Port N
0, // Reserved
IntDefaultHandler, // Tamper
IntDefaultHandler, // GPIO Port P (Summary or P0)
IntDefaultHandler, // GPIO Port P1
IntDefaultHandler, // GPIO Port P2
IntDefaultHandler, // GPIO Port P3
IntDefaultHandler, // GPIO Port P4
IntDefaultHandler, // GPIO Port P5
IntDefaultHandler, // GPIO Port P6
IntDefaultHandler, // GPIO Port P7
IntDefaultHandler, // GPIO Port Q (Summary or Q0)
IntDefaultHandler, // GPIO Port Q1
IntDefaultHandler, // GPIO Port Q2
IntDefaultHandler, // GPIO Port Q3
IntDefaultHandler, // GPIO Port Q4
IntDefaultHandler, // GPIO Port Q5
IntDefaultHandler, // GPIO Port Q6
IntDefaultHandler, // GPIO Port Q7
IntDefaultHandler, // GPIO Port R
IntDefaultHandler, // GPIO Port S
IntDefaultHandler, // SHA/MD5 0
IntDefaultHandler, // AES 0
IntDefaultHandler, // DES3DES 0
IntDefaultHandler, // LCD Controller 0
IntDefaultHandler, // Timer 6 subtimer A
IntDefaultHandler, // Timer 6 subtimer B
IntDefaultHandler, // Timer 7 subtimer A
IntDefaultHandler, // Timer 7 subtimer B
IntDefaultHandler, // I2C6 Master and Slave
IntDefaultHandler, // I2C7 Master and Slave
IntDefaultHandler, // HIM Scan Matrix Keyboard 0
IntDefaultHandler, // One Wire 0
IntDefaultHandler, // HIM PS/2 0
IntDefaultHandler, // HIM LED Sequencer 0
IntDefaultHandler, // HIM Consumer IR 0
IntDefaultHandler, // I2C8 Master and Slave
IntDefaultHandler, // I2C9 Master and Slave
IntDefaultHandler, // GPIO Port T
IntDefaultHandler, // Fan 1
0, // Reserved
};

//*****************************************************************************
//
// This is the code that gets called when the processor first starts execution
// following a reset event. Only the absolutely necessary set is performed,
// after which the application supplied entry() routine is called. Any fancy
// actions (such as making decisions based on the reset cause register, and
// resetting the bits in that register) are left solely in the hands of the
// application.
//
//*****************************************************************************
void
ResetISR(void)
{
//
// Jump to the CCS C initialization routine. This will enable the
// floating-point unit as well, so that does not need to be done here.
//
__asm(" .global _c_int00\n"
" b.w _c_int00");
}

//*****************************************************************************
//
// This is the code that gets called when the processor receives a NMI. This
// simply enters an infinite loop, preserving the system state for examination
// by a debugger.
//
//*****************************************************************************
static void
NmiSR(void)
{
//
// Enter an infinite loop.
//
while(1)
{
}
}

//*****************************************************************************
//
// This is the code that gets called when the processor receives a fault
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
static void
FaultISR(void)
{
//
// Enter an infinite loop.
//
while(1)
{
}
}

//*****************************************************************************
//
// This is the code that gets called when the processor receives an unexpected
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
static void
IntDefaultHandler(void)
{
//
// Go into an infinite loop.
//
while(1)
{
}
}

over 5 years ago

0 Charles Tsai over 5 years ago

TI__Guru**** 191906 points

Hi,

Please see the lab4 solution below.

#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"

int main(void)
{
    uint32_t ui32Period;

    SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
    GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
    TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);

    ui32Period = (SysCtlClockGet() / 10) / 2;
    TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);

    IntEnable(INT_TIMER0A);
    TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
    IntMasterEnable();

    TimerEnable(TIMER0_BASE, TIMER_A);

    while(1)
    {
    }
}

void Timer0IntHandler(void)
{
    // Clear the timer interrupt
    TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

    // Read the current state of the GPIO pin and
    // write back the opposite state
    if(GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_2))
    {
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 0);
    }
    else
    {
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 4);
    }
}

0 millwood over 5 years ago

Prodigy 250 points

"TM4C1294NCPDT: Not generating an interrupt"

it probably makes sense for you to first establish why you think that you have a problem - and in fact that you have a problem. aka help others help you.

In this case, it is quite easy to confirm: if you have a debugger, just see if you will ever step into the interrupt that you thought you were missing.

a simpler approach is to flip a pin in the ISR. and see if you can observe that.

0 Marwa Safa over 5 years ago in reply to Charles Tsai

Prodigy 110 points

I followed this exact code except for the fact that my device has the LED pins in a different area and so I only changed those, but I'm not sure if I had to change anything else. I know I have the LED code right because I'm able to flash it without an interrupt. I accidentally said this was resolved but it has yet to work

0 Marwa Safa over 5 years ago in reply to millwood

Prodigy 110 points

Honestly, I'm really new to interrupts, I only think it's not working because my LED isn't flashing when the tutorial said it should.

0 Charles Tsai over 5 years ago in reply to Marwa Safa

TI__Guru**** 191906 points

The problem with your code is that you are basing off the workshop lab that is targeted for the TM4C123 device, not the TM4C129 device. The way you use the SysCtlClockSet to configure clock is incorrect for TM4C129. See below code that I modified from yours. For detail, reference to the Peripheral Driver library user's guide where it says the SysCtlClockSet is only used for TM4C123 device.

int main(void)
{
    uint32_t ui32Period;

    g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                             SYSCTL_OSC_MAIN |
                                             SYSCTL_USE_PLL |
                                             SYSCTL_CFG_VCO_480), 120000000);


    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
    GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_0);

    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
    TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);

    ui32Period = (g_ui32SysClock / 10) / 2;
    TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period - 1);

    IntEnable(INT_TIMER0A);
    TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
    IntMasterEnable();

    TimerEnable(TIMER0_BASE, TIMER_A);

    while (1)
    {
    }
}

void Timer0IntHandler(void)
{
    // Clear the timer interrupt
    TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

    // Read the current state of the GPIO pin and
    // write back the opposite state
    if (GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_0))
    {
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, 0);
    }
    else
    {
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, GPIO_PIN_0);
    }
}

0 Marwa Safa over 5 years ago in reply to Charles Tsai

Prodigy 110 points

This worked. Thank you!

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TM4C1294NCPDT: Not generating an interrupt