qpc/examples/freertos/arm-cm/dpp_ek-tm4c123gxl/bsp.c

/*****************************************************************************
* Product: DPP example, EK-TM4C123GXL board, FreeRTOS kernel
* Last Updated for Version: 5.5.0
* Date of the Last Update:  2015-08-20
*
*                    Q u a n t u m     L e a P s
*                    ---------------------------
*                    innovating embedded systems
*
* Copyright (C) Quantum Leaps, LLC. All rights reserved.
*
* This program is open source software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Alternatively, this program may be distributed and modified under the
* terms of Quantum Leaps commercial licenses, which expressly supersede
* the GNU General Public License and are specifically designed for
* licensees interested in retaining the proprietary status of their code.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Contact information:
* http://www.state-machine.com
* mailto:info@state-machine.com
*****************************************************************************/
#include "qpc.h"
#include "dpp.h"
#include "bsp.h"

#include "TM4C123GH6PM.h"        /* the device specific header (TI) */
#include "rom.h"                 /* the built-in ROM functions (TI) */
#include "sysctl.h"              /* system control driver (TI) */
#include "gpio.h"                /* GPIO driver (TI) */
/* add other drivers if necessary... */

Q_DEFINE_THIS_FILE  /* define the name of this file for assertions */

/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! CAUTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* Assign a priority to EVERY ISR explicitly by calling NVIC_SetPriority().
* DO NOT LEAVE THE ISR PRIORITIES AT THE DEFAULT VALUE!
*/
enum KernelUnawareISRs { /* see NOTE1 */
    /* ... */
    MAX_KERNEL_UNAWARE_CMSIS_PRI /* keep always last */
};
/* "kernel-unaware" interrupts can't overlap "kernel-aware" interrupts */
Q_ASSERT_COMPILE(MAX_KERNEL_UNAWARE_CMSIS_PRI
                 <= configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);

enum KernelAwareISRs {
    GPIOA_PRIO = configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY, /* NOTE1 */
    /* ... */
    MAX_KERNEL_AWARE_CMSIS_PRI /* keep always last */
};
/* "kernel-aware" interrupts should not overlap the PendSV priority */
Q_ASSERT_COMPILE(MAX_KERNEL_AWARE_CMSIS_PRI <= (0xFF >>(8-__NVIC_PRIO_BITS)));

/* LEDs and Switches of the EK-TM4C123GXL board ............................*/
#define LED_RED     (1U << 1)
#define LED_GREEN   (1U << 3)
#define LED_BLUE    (1U << 2)

#define BTN_SW1     (1U << 4)
#define BTN_SW2     (1U << 0)

static uint32_t l_rnd;  /* random seed */

#ifdef Q_SPY

    QSTimeCtr QS_tickTime_;
    QSTimeCtr QS_tickPeriod_;

    /* QS identifiers for non-QP sources of events */
    static uint8_t const l_TickHook = 0U;
    static uint8_t const l_GPIOPortA_IRQHandler = 0U;

    #define UART_BAUD_RATE      115200U
    #define UART_FR_TXFE        0x80U
    #define UART_TXFIFO_DEPTH   16U

    enum AppRecords { /* application-specific trace records */
        PHILO_STAT = QS_USER
    };

#endif

/* ISRs used in this project ===============================================*/
void GPIOPortA_IRQHandler(void); /* prototype */
void GPIOPortA_IRQHandler(void) {
    QF_CRIT_STAT_TYPE intStat;
    BaseType_t lHigherPriorityTaskWoken = pdFALSE;

    QF_ISR_ENTRY(intStat);              /* <=== inform QF about ISR entry */

    QACTIVE_POST(AO_Table, Q_NEW(QEvt, MAX_PUB_SIG), /* for testing... */
                 &l_GPIOPortA_IRQHandler);

    QF_ISR_EXIT(intStat, lHigherPriorityTaskWoken); /* <=== ISR exit */

    /* the usual end of FreeRTOS ISR... */
    portEND_SWITCHING_ISR(lHigherPriorityTaskWoken);
}

/* Application hooks used in this project ==================================*/
void vApplicationTickHook(void) {
    /* state of the button debouncing, see below */
    static struct ButtonsDebouncing {
        uint32_t depressed;
        uint32_t previous;
    } buttons = { ~0U, ~0U };
    uint32_t current;
    uint32_t tmp;
    QF_CRIT_STAT_TYPE intStat;
    BaseType_t lHigherPriorityTaskWoken = pdFALSE;

    QF_ISR_ENTRY(intStat);     /* <=== inform QF about ISR entry */

    QF_TICK_X(0U, &l_TickHook); /* process time events for rate 0 */

    /* Perform the debouncing of buttons. The algorithm for debouncing
    * adapted from the book "Embedded Systems Dictionary" by Jack Ganssle
    * and Michael Barr, page 71.
    */
    current = ~GPIOF->DATA_Bits[BTN_SW1 | BTN_SW2];  /* read SW1 and SW2 */
    tmp = buttons.depressed;     /* save the debounced depressed buttons */
    buttons.depressed |= (buttons.previous & current);  /* set depressed */
    buttons.depressed &= (buttons.previous | current); /* clear released */
    buttons.previous   = current; /* update the history */
    tmp ^= buttons.depressed;     /* changed debounced depressed */
    if ((tmp & BTN_SW1) != 0U) {  /* debounced SW1 state changed? */
        if ((buttons.depressed & BTN_SW1) != 0U) { /* is SW1 depressed? */
            static QEvt const pauseEvt = { PAUSE_SIG, 0U, 0U};
            QF_PUBLISH(&pauseEvt, &l_TickHook);
        }
        else {            /* the button is released */
            static QEvt const serveEvt = { SERVE_SIG, 0U, 0U};
            QF_PUBLISH(&serveEvt, &l_TickHook);
        }
    }

    QF_ISR_EXIT(intStat, lHigherPriorityTaskWoken); /* <=== ISR exit */

    /* yield only when needed... */
    if (lHigherPriorityTaskWoken != pdFALSE) {
        vTaskMissedYield();
    }
}
/*..........................................................................*/
void vApplicationIdleHook(void) {
    /* visualize the idle loop activity, see NOTE2 */
    QF_INT_DISABLE();
    GPIOF->DATA_Bits[LED_BLUE] = 0xFFU;
    GPIOF->DATA_Bits[LED_BLUE] = 0U;
    QF_INT_ENABLE();

#ifdef Q_SPY
    if ((UART0->FR & UART_FR_TXFE) != 0) { /* TX done? */
        uint16_t fifo = UART_TXFIFO_DEPTH; /* max bytes we can accept */
        uint8_t const *block;

        QF_INT_DISABLE();
        block = QS_getBlock(&fifo); /* get next block to transmit */
        QF_INT_ENABLE();

        while (fifo-- != 0) {     /* any bytes in the block? */
            UART0->DR = *block++; /* put into the FIFO */
        }
    }
#elif defined NDEBUG
    /* Put the CPU and peripherals to the low-power mode.
    * You might need to customize the clock management for your project,
    * see the datasheet for your particular Cortex-M3 MCU.
    */
    __WFI(); /* Wait-For-Interrupt */
#endif
}
/*..........................................................................*/
void vApplicationStackOverflowHook(TaskHandle_t xTask, char *pcTaskName) {
    (void)xTask;
    (void)pcTaskName;
    Q_ERROR();
}

/* BSP functions ===========================================================*/
void BSP_init(void) {
    /* NOTE: SystemInit() has been already called from the startup code
    *  but SystemCoreClock needs to be updated
    */
    SystemCoreClockUpdate();

    /* configure the FPU
    * Do NOT to use the automatic FPU state preservation and
    * do NOT to use the FPU lazy stacking.
    */
    FPU->FPCCR &= ~((1U << FPU_FPCCR_ASPEN_Pos) | (1U << FPU_FPCCR_LSPEN_Pos));

    /* enable clock for to the peripherals used by this application... */
    SYSCTL->RCGCGPIO |= (1U << 5); /* enable Run mode for GPIOF */

    /* configure the LEDs and push buttons */
    GPIOF->DIR |= (LED_RED | LED_GREEN | LED_BLUE); /* set as output */
    GPIOF->DEN |= (LED_RED | LED_GREEN | LED_BLUE);/* digital enable */
    GPIOF->DATA_Bits[LED_RED]   = 0U; /* turn the LED off */
    GPIOF->DATA_Bits[LED_GREEN] = 0U; /* turn the LED off */
    GPIOF->DATA_Bits[LED_BLUE]  = 0U; /* turn the LED off */

    /* configure the User Switches */
    GPIOF->DIR &= ~(BTN_SW1 | BTN_SW2); /*  set direction: input */
    ROM_GPIOPadConfigSet(GPIOF_BASE, (BTN_SW1 | BTN_SW2),
                         GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);

    BSP_randomSeed(1234U);

    /* initialize the QS software tracing... */
    if (QS_INIT((void *)0) == 0U) {
        Q_ERROR();
    }
    QS_OBJ_DICTIONARY(&l_TickHook);
    QS_OBJ_DICTIONARY(&l_GPIOPortA_IRQHandler);
}
/*..........................................................................*/
void BSP_displayPhilStat(uint8_t n, char const *stat) {
    GPIOF->DATA_Bits[LED_GREEN] =
         ((stat[0] == 'e')   /* Is Philo[n] eating? */
         ? 0xFFU             /* turn the LED1 on  */
         : 0U);              /* turn the LED1 off */

    QS_BEGIN(PHILO_STAT, AO_Philo[n]) /* application-specific record begin */
        QS_U8(1, n);                  /* Philosopher number */
        QS_STR(stat);                 /* Philosopher status */
    QS_END()
}
/*..........................................................................*/
void BSP_displayPaused(uint8_t paused) {
    GPIOF->DATA_Bits[LED_GREEN] = ((paused != 0U) ? 0xFFU : 0U);
}
/*..........................................................................*/
uint32_t BSP_random(void) { /* a very cheap pseudo-random-number generator */
    /* exercise the FPU with some floating point computations */
    /* NOTE: this code can be only called from a task that created with
    * the option OS_TASK_OPT_SAVE_FP.
    */
    float volatile x;
    x = 3.1415926F;
    x = x + 2.7182818F;

    /* "Super-Duper" Linear Congruential Generator (LCG)
    * LCG(2^32, 3*7*11*13*23, 0, seed)
    */
    l_rnd = l_rnd * (3U*7U*11U*13U*23U);
    return l_rnd >> 8;
}
/*..........................................................................*/
void BSP_randomSeed(uint32_t seed) {
    l_rnd = seed;
}
/*..........................................................................*/
void BSP_terminate(int16_t result) {
    (void)result;
}

/* QF callbacks ============================================================*/
void QF_onStartup(void) {
    /* set up the SysTick timer to fire at BSP_TICKS_PER_SEC rate */
    //SysTick_Config(SystemCoreClock / BSP_TICKS_PER_SEC);

    /* set priorities of ALL ISRs used in the system, see NOTE00
    *
    * !!!!!!!!!!!!!!!!!!!!!!!!!!!! CAUTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    * Assign a priority to EVERY ISR explicitly by calling NVIC_SetPriority().
    * DO NOT LEAVE THE ISR PRIORITIES AT THE DEFAULT VALUE!
    */
    //NVIC_SetPriority(SysTick_IRQn,   SYSTICK_PRIO);
    NVIC_SetPriority(GPIOA_IRQn, GPIOA_PRIO);
    /* ... */

    /* enable IRQs... */
    NVIC_EnableIRQ(GPIOA_IRQn);
    /* ... */
}
/*..........................................................................*/
void QF_onCleanup(void) {
}

/*..........................................................................*/
void Q_onAssert(char const *module, int loc) {
    /*
    * NOTE: add here your application-specific error handling
    */
    (void)module;
    (void)loc;
    QS_ASSERTION(module, loc, (uint32_t)10000U); /* report assertion to QS */
    NVIC_SystemReset();
}

/* QS callbacks ============================================================*/
#ifdef Q_SPY
/*..........................................................................*/
uint8_t QS_onStartup(void const *arg) {
    static uint8_t qsBuf[2*1024]; /* buffer for Quantum Spy */
    uint32_t tmp;
    QS_initBuf(qsBuf, sizeof(qsBuf));

    /* enable clock for UART0 and GPIOA (used by UART0 pins) */
    SYSCTL->RCGCUART |= (1U << 0); /* enable Run mode for UART0 */
    SYSCTL->RCGCGPIO |= (1U << 0); /* enable Run mode for GPIOA */

    /* configure UART0 pins for UART operation */
    tmp = (1U << 0) | (1U << 1);
    GPIOA->DIR   &= ~tmp;
    GPIOA->SLR   &= ~tmp;
    GPIOA->ODR   &= ~tmp;
    GPIOA->PUR   &= ~tmp;
    GPIOA->PDR   &= ~tmp;
    GPIOA->AMSEL &= ~tmp;  /* disable analog function on the pins */
    GPIOA->AFSEL |= tmp;   /* enable ALT function on the pins */
    GPIOA->DEN   |= tmp;   /* enable digital I/O on the pins */
    GPIOA->PCTL  &= ~0x00U;
    GPIOA->PCTL  |= 0x11U;

    /* configure the UART for the desired baud rate, 8-N-1 operation */
    tmp = (((SystemCoreClock * 8U) / UART_BAUD_RATE) + 1U) / 2U;
    UART0->IBRD   = tmp / 64U;
    UART0->FBRD   = tmp % 64U;
    UART0->LCRH   = (0x3U << 5); /* configure 8-N-1 operation */
    UART0->LCRH  |= (0x1U << 4); /* enable FIFOs */
    UART0->CTL    = (1U << 0)    /* UART enable */
                    | (1U << 8)  /* UART TX enable */
                    | (1U << 9); /* UART RX enable */

    QS_tickPeriod_ = SystemCoreClock / BSP_TICKS_PER_SEC;
    QS_tickTime_ = QS_tickPeriod_; /* to start the timestamp at zero */

    /* setup the QS filters... */
    QS_FILTER_ON(QS_QEP_STATE_ENTRY);
    QS_FILTER_ON(QS_QEP_STATE_EXIT);
    QS_FILTER_ON(QS_QEP_STATE_INIT);
    QS_FILTER_ON(QS_QEP_INIT_TRAN);
    QS_FILTER_ON(QS_QEP_INTERN_TRAN);
    QS_FILTER_ON(QS_QEP_TRAN);
    QS_FILTER_ON(QS_QEP_IGNORED);
    QS_FILTER_ON(QS_QEP_DISPATCH);
    QS_FILTER_ON(QS_QEP_UNHANDLED);

    QS_FILTER_ON(PHILO_STAT);

    return (uint8_t)1; /* return success */
}
/*..........................................................................*/
void QS_onCleanup(void) {
}
/*..........................................................................*/
QSTimeCtr QS_onGetTime(void) {  /* NOTE: invoked with interrupts DISABLED */
    if ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0) { /* not set? */
        return QS_tickTime_ - (QSTimeCtr)SysTick->VAL;
    }
    else { /* the rollover occured, but the SysTick_ISR did not run yet */
        return QS_tickTime_ + QS_tickPeriod_ - (QSTimeCtr)SysTick->VAL;
    }
}
/*..........................................................................*/
void QS_onFlush(void) {
    uint16_t fifo = UART_TXFIFO_DEPTH; /* Tx FIFO depth */
    uint8_t const *block;
    QF_INT_DISABLE();
    while ((block = QS_getBlock(&fifo)) != (uint8_t *)0) {
        QF_INT_ENABLE();
        /* busy-wait until TX FIFO empty */
        while ((UART0->FR & UART_FR_TXFE) == 0) {
        }

        while (fifo-- != 0) {    /* any bytes in the block? */
            UART0->DR = *block++; /* put into the TX FIFO */
        }
        fifo = UART_TXFIFO_DEPTH; /* re-load the Tx FIFO depth */
        QF_INT_DISABLE();
    }
    QF_INT_ENABLE();
}
#endif /* Q_SPY */
/*--------------------------------------------------------------------------*/

/*****************************************************************************
* NOTE1:
* The configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY constant from the
* FreeRTOS configuration file specifies the highest ISR priority that
* is disabled by the QF framework. The value is suitable for the
* NVIC_SetPriority() CMSIS function.
*
* Only ISRs prioritized at or below the
* configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY level (i.e.,
* with the numerical values of priorities equal or higher than
* configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY) are allowed to call any
* QP/FreeRTOS services. These ISRs are "kernel-aware".
*
* Conversely, any ISRs prioritized above the
* configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY priority level (i.e., with
* the numerical values of priorities less than
* configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY) are never disabled and are
* not aware of the kernel. Such "kernel-unaware" ISRs cannot call any
* QP/FreeRTOS services. The only mechanism by which a "kernel-unaware" ISR
* can communicate with the QF framework is by triggering a "kernel-aware"
* ISR, which can post/publish events.
*
* For more information, see article "Running the RTOS on a ARM Cortex-M Core"
* http://www.freertos.org/RTOS-Cortex-M3-M4.html
*
* NOTE2:
* The blue LED is used to visualize the idle loop activity. The brightness
* of the LED is proportional to the frequency of invcations of the idle loop.
* Please note that the LED is toggled with interrupts locked, so no interrupt
* execution time contributes to the brightness of the blue LED.
*/