modern-embedded-programming-course/lesson-36/tm4c123-uc_ao-keil/main.c

/* TimeBomb/Button with uC/OS-II RTOS */
#include "uc_ao.h"  /* uC/AO API */
#include "bsp.h"
#include <stdbool.h>

Q_DEFINE_THIS_MODULE("main") /* this module name for Q_ASSERT() */

/* The TimeBomb AO =======================================================*/
typedef struct {
    Active super; /* inherit Active base class */
    /* add private data for the AO... */
    enum {
        WAIT4BUTTON_STATE,
        BLINK_STATE,
        PAUSE_STATE,
        BOOM_STATE
    } state; /* the "state variable" */

    TimeEvent te;
    uint32_t blink_ctr;
} TimeBomb;

static void TimeBomb_dispatch(TimeBomb * const me, Event const * const e) {
    if (e->sig == INIT_SIG) {
         BSP_ledGreenOn();
         me->state = WAIT4BUTTON_STATE;
    }

    switch (me->state) {
        case WAIT4BUTTON_STATE: {
            switch (e->sig) {
                case BUTTON_PRESSED_SIG: {
                    BSP_ledGreenOff();
                    BSP_ledRedOn();
                    TimeEvent_arm(&me->te, OS_TICKS_PER_SEC/2, 0U);
                    me->blink_ctr = 10U;
                    me->state = BLINK_STATE;
                    break;
                }
            }
            break;
        }
        case BLINK_STATE: {
            switch (e->sig) {
                case TIMEOUT_SIG: {
                    BSP_ledRedOff();
                    TimeEvent_arm(&me->te, OS_TICKS_PER_SEC/2, 0U);
                    me->state = PAUSE_STATE;
                    break;
                }
            }
            break;
        }
        case PAUSE_STATE: {
            switch (e->sig) {
                case TIMEOUT_SIG: {
                    --me->blink_ctr;
                    if (me->blink_ctr > 0U) {
                        BSP_ledRedOn();
                        TimeEvent_arm(&me->te, OS_TICKS_PER_SEC/2, 0U);
                        me->state = BLINK_STATE;
                    }
                    else {
                        BSP_ledRedOn();
                        BSP_ledGreenOn();
                        BSP_ledBlueOn();
                        me->state = BOOM_STATE;
                    }
                    break;
                }
            }
            break;
        }
        case BOOM_STATE: {
            break;
        }
        default: {
            Q_ASSERT(0); /* invalid state! */
            break;
        }
    }
}

void TimeBomb_ctor(TimeBomb * const me) {
    Active_ctor(&me->super, (DispatchHandler)&TimeBomb_dispatch);
    TimeEvent_ctor(&me->te, TIMEOUT_SIG, &me->super);
}

OS_STK stack_timeBomb[100]; /* task stack */
static Event *timeBomb_queue[10];
static TimeBomb timeBomb;
Active *AO_TimeBomb = &timeBomb.super;

/* the main function =========================================================*/
int main() {
    INT8U err;

    BSP_init(); /* initialize the BSP */
    OSInit();   /* initialize uC/OS-II */

    /* create AO and start it */
    TimeBomb_ctor(&timeBomb);
    Active_start(AO_TimeBomb,
                 2U,
                 timeBomb_queue,
                 sizeof(timeBomb_queue)/sizeof(timeBomb_queue[0]),
                 stack_timeBomb,
                 sizeof(stack_timeBomb),
                 0U);

    BSP_start(); /* configure and start the interrupts */

    OSStart(); /* start the uC/OS-II scheduler... */
    return 0; /* NOTE: the scheduler does NOT return */
}

/*******************************************************************************
* NOTE1:
* The call to uC/OS-II API OSTaskCreateExt() assumes that the pointer to the
* top-of-stack (ptos) is at the end of the provided stack memory. This is
* correct only for CPUs with downward-growing stack, but must be changed for
* CPUs with upward-growing stack.
*/