RTOS/TM4C1231H6PGE: [Resolved] TM4C1231H6PGE: PWM interrupt never fires

/*
 * Copyright (c) 2015, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== main.c ========
 */
/* XDCtools Header files */
#include <xdc/std.h>
#include <xdc/cfg/global.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>


/* TI-RTOS Header files */
#include <ti/drivers/GPIO.h>
// #include <ti/drivers/I2C.h>
// #include <ti/drivers/SDSPI.h>
// #include <ti/drivers/SPI.h>
// #include <ti/drivers/UART.h>
// #include <ti/drivers/Watchdog.h>
// #include <ti/drivers/WiFi.h>

/* Board Header file */
#include "Board.h"

#include "lib/pwm.h"

#define TASKSTACKSIZE   512

Task_Struct task0Struct;
Char task0Stack[TASKSTACKSIZE];

/*
 *  ======== heartBeatFxn ========
 *  Toggle the Board_LED0. The Task_sleep is determined by arg0 which
 *  is configured for the heartBeat Task instance.
 */
Void heartBeatFxn(UArg arg0, UArg arg1)
{
    //pwm_start();
    while (1) {
        Task_sleep((UInt)arg0);
        GPIO_toggle(Board_LED0_BLUE);
        pwm_update();
    }
}

/*
 *  ======== main ========
 */
int main(void)
{
    Task_Params taskParams;

    /* Call board init functions */
    Board_initGeneral();
    Board_initGPIO();
    // Board_initI2C();
    // Board_initSDSPI();
    // Board_initSPI();
    // Board_initUART();
    // Board_initUSB(Board_USBDEVICE);
    // Board_initWatchdog();
    // Board_initWiFi();

    /* Construct heartBeat Task  thread */
    Task_Params_init(&taskParams);
    taskParams.arg0 = 1000;
    taskParams.stackSize = TASKSTACKSIZE;
    taskParams.stack = &task0Stack;
    Task_construct(&task0Struct, (Task_FuncPtr)heartBeatFxn, &taskParams, NULL);

    /* Turn on user LED */
    GPIO_write(Board_LED0_BLUE, Board_LED_ON);
    //GPIO_write(Board_LED2_RED, Board_LED_ON);

    /* Initialize PWM */
    pwm_init();

    System_printf("Starting the example\nSystem provider is set to SysMin. "
                  "Halt the target to view any SysMin contents in ROV.\n");
    /* SysMin will only print to the console when you call flush or exit */
    System_flush();

    /* Start BIOS */
    BIOS_start();

    return (0);
}

#include "lib/pwm.h"
// TivaWare(tm) Peripheral Driver Library USER’S GUIDE - SPMU298d, section 21

#define USE_SWI 0

void pwm_swi(void)
{
#if Use_SWI
    pwmCount++;
    GPIO_toggle(Board_LED2_RED);
#endif
}

void pwm_isr(void)
{
    PWMGenIntClear(PWM1_BASE, PWM_GEN_0, PWM_INT_CNT_ZERO);
#if Use_SWI
    Swi_post(PWMswi);
#else
    pwmCount++;
    GPIO_toggle(Board_LED2_RED);
#endif
}


void pwm_init(void)
{
    //SysCtlClockSet( SYSCTL_SYSDIV_2_5 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ );
    SysCtlPWMClockSet( SYSCTL_PWMDIV_64 );

#if 1
    // Enable the GPIO peripheral
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
    //
    // Wait for the GPIO module to be ready.
    //
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOD))
        ;
#endif

    GPIOPinTypePWM( GPIO_PORTD_BASE, GPIO_PIN_0 );
    GPIOPinConfigure( GPIO_PD0_M1PWM0 );

    // Enable the PWM1 peripheral
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1);
    //
    // Wait for the PWM1 module to be ready.
    //
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_PWM1))
        ;
    //
    // Configure the PWM generator for count down mode with immediate updates
    // to the parameters.
    //
    PWMGenConfigure(PWM1_BASE, PWM_GEN_0,
                    PWM_GEN_MODE_DOWN | PWM_GEN_MODE_NO_SYNC);
    //
    // Set the period.
    //
    PWMGenPeriodSet(PWM1_BASE, PWM_GEN_0, F_MAX_CT);
    //
    // Set the pulse width of PWM1 for a single microstep.
    //
    PWMPulseWidthSet(PWM1_BASE, PWM_OUT_0, 2500);
    //
    // Start the timers in generator 0.
    //
    PWMOutputState(PWM1_BASE, PWM_OUT_0_BIT, true);
    PWMGenEnable(PWM1_BASE, PWM_GEN_0);

    //PWMGenIntRegister(PWM1_BASE, PWM_GEN_0, &pwm_isr);
    PWMGenIntTrigEnable (PWM1_BASE, PWM_GEN_0, PWM_INT_CNT_ZERO) ;
    PWMIntEnable (PWM1_BASE, PWM_INT_GEN_0) ;

    //IntRegister(INT_PWM1_0, &pwm_isr);
    IntEnable(INT_PWM1_0);

    IntMasterEnable();

}


inline void pwm_start(void)
{
    // Enable the outputs.
    //
    //PWMOutputState(PWM1_BASE, PWM_OUT_ALL_BITS, true);
}


inline void pwm_stop(void)
{
    // Disable the outputs.
    //
    //PWMOutputState(PWM1_BASE, PWM_OUT_ALL_BITS, false);
}


void pwm_update(void)
{
    PWMGenDisable(PWM1_BASE, PWM_GEN_0);
    // Set the period.
    //
    PWMGenPeriodSet(PWM1_BASE, PWM_GEN_0, PWM_period);
    //
    // Set the pulse width of PWM1.
    //
    PWMPulseWidthSet(PWM1_BASE, PWM_OUT_0, PWM_duty);
    PWMGenEnable(PWM1_BASE, PWM_GEN_0);
}


void pwm_setPeriod(uint32_t pwmPeriod)
{
    // Set the period.
    //
    PWMGenPeriodSet(PWM1_BASE, PWM_GEN_1, pwmPeriod);
}


void pwm_setDuty(uint32_t pwmDuty)
{
    // Set the pulse width of PWM1.
    //
    PWMPulseWidthSet(PWM1_BASE, PWM_OUT_1, pwmDuty);
}