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CCS/TM4C123GH6PM: TM4C123GH6PM

Sankari P
Prodigy 60 points
Part Number: TM4C123GH6PM


Tool/software: Code Composer Studio

hi,

     I have downloaded the source code for PWM (TM4C123G-launch pad evalution kit). After flashing code , it will stuck in default interrupt handler( tm4c123gh6pm_startup_ccs.c).

    //*****************************************************************************
//
// 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)
    {
    }
}

          I just want to know , some configuration is missing or its a problem with board.

Thanks in advance,

Regards,

sankari.

  • 0
    TI__Guru**** 191906 points

    HI,

      Which example code did you download to run? It looks like the PWM module is generating an interrupt but you didn't create a interrupt vector in the vector table for the PWM module. The default vector is the IntDefaultHandler. Therefore, when the PWM generates the interrupt it jumps to the IntDefaultHandler. See below snippet in the default vector table in the startup file. You will need to change the IntDefaultHandler to the vector that points to the ISR of your own for whichever PWM generator you are using. Note there are two PWM modules in the device and each PWM module supports 4 different generators. Make sure you map your ISR to the right one you are creating the interrupt from.

    #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

  • 0 in reply to Charles Tsai
    Prodigy 60 points

    hi,

     Thanks charles,

        We already enabled PWM interrupt handler.Since, we getting this problem with ISR. Whenever, we are using timer interrupt, then only we are getting the ISR issue.(Default handler). We had attached vector table.

    https://github.com/YashBansod/ARM-TM4C-CCS

    #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
        IntDefaultHandler,                      // 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,                      // Quadrature Encoder 1
        IntDefaultHandler,                      // CAN0
        IntDefaultHandler,                      // CAN1
        0,                                      // Reserved
        0,                                      // Reserved
        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
        0,                                      // Reserved
        0,                                      // Reserved
        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
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        IntDefaultHandler,                      // I2C2 Master and Slave
        IntDefaultHandler,                      // I2C3 Master and Slave
        IntDefaultHandler,                      // Timer 4 subtimer A
        IntDefaultHandler,                      // Timer 4 subtimer B
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        0,                                      // Reserved
        IntDefaultHandler,                      // Timer 5 subtimer A
        IntDefaultHandler,                      // Timer 5 subtimer B
        IntDefaultHandler,                      // Wide Timer 0 subtimer A
        IntDefaultHandler,                      // Wide Timer 0 subtimer B
        IntDefaultHandler,                      // Wide Timer 1 subtimer A
        IntDefaultHandler,                      // Wide Timer 1 subtimer B
        IntDefaultHandler,                      // Wide Timer 2 subtimer A
        IntDefaultHandler,                      // Wide Timer 2 subtimer B
        IntDefaultHandler,                      // Wide Timer 3 subtimer A
        IntDefaultHandler,                      // Wide Timer 3 subtimer B
        IntDefaultHandler,                      // Wide Timer 4 subtimer A
        IntDefaultHandler,                      // Wide Timer 4 subtimer B
        IntDefaultHandler,                      // Wide Timer 5 subtimer A
        IntDefaultHandler,                      // Wide 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
        IntDefaultHandler,                      // Quadrature Encoder 2
        0,                                      // Reserved
        0,                                      // Reserved
        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,                      // PWM 1 Generator 0
        IntDefaultHandler,                      // PWM 1 Generator 1
        IntDefaultHandler,                      // PWM 1 Generator 2
        IntDefaultHandler,                      // PWM 1 Generator 3
        IntDefaultHandler                       // PWM 1 Fault
    };

    Regards,

    sankari.

  • 0 in reply to Sankari P
    TI__Guru**** 191906 points

    Hi,

      Your vector table is different compared to what is provided. You are missing the Timer0IntHandler ISR. The example you are referencing is using the GP timer to generate the PWM waveform. You need to specify the Timer0IntHandler as the vector which you didn't in your above pasted code. Why don't you just use that example's startup file. 

    #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)