main_freertos_agm02_power_cycling.c

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/*
 * Copyright (c) 2016, NXP Semiconductor, Inc.
 * All rights reserved.
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 *   of conditions and the following disclaimer.
 *
 * o 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.
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 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
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/*! \file main_freertos_agm02_power_cycling.c
    \brief FreeRTOS (two task) implementation of sensor fusion on FRDM-K64F/FRDM-FXS-AGM02 with smart power-cycling support.

    This file shows one recommended way to incorporate sensor fusion capabilities
    into a FreeRTOS project AND adds intelligent power down of sensors when
    the DUT is stationary.
*/

// KSDK and ISSDK Headers
#include "fsl_debug_console.h"  // KSDK header file for the debug interface
#include "FSL_SMC.H"            // KDSK header file for the System Mode Controller Driver
#include "board.h"              // KSDK header file to define board configuration
#include "pin_mux.h"            // KSDK header file for pin mux initialization functions
#include "clock_config.h"       // KSDK header file for clock configuration
#include "fsl_port.h"           // KSDK header file for Port I/O control
#include "fsl_i2c.h"            // KSDK header file for I2C interfaces
#include "Driver_I2C.h"
#include "Driver_I2C_SDK2.h"

// Sensor Fusion Headers
#include "sensor_fusion.h"      // top level magCal and sensor fusion interfaces
#include "control.h"            // Command/Streaming interface - application specific
#include "status.h"             // Status indicator interface - application specific
#include "drivers.h"            // NXP sensor drivers OR customer-supplied drivers
#include "fusion.h"             // Need lower level function for power management

/* FreeRTOS kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "timers.h"
#include "event_groups.h"

// Global data structures
SensorFusionGlobals sfg;                ///< This is the primary sensor fusion data structure
ControlSubsystem controlSubsystem;      ///< used for serial communications
StatusSubsystem statusSubsystem;        ///< provides visual (usually LED) status indicator
PhysicalSensor sensors[3];              ///< This implementation uses three physical sensors
EventGroupHandle_t event_group = NULL;
void vApplicationIdleHook( void )
{
  // MCU low power modes are not debugged at this point in time
    //volatile smc_power_state_t state;
    //SMC_SetPowerModeStop(SMC, kSMC_PartialStop );
    //state = SMC_GetPowerModeState(SMC);
    //asm("wfi");
}
void vApplicationTickHook( void )
{
    sfg.queueStatus(&sfg, NORMAL);      // assume NORMAL status for next pass through the loop
}

static void read_task(void *pvParameters);
static void fusion_task(void *pvParameters);
bool motionCheck(   float sample[3],
                    float baseline[3],
                    float tolerance,
                    uint32_t winLength,
                    uint32_t *count);  // defined in motionCheck.c
/// This is a FreeRTOS (dual task) implementation of the NXP sensor fusion demo build.
int main(void)
{
    ARM_DRIVER_I2C* I2Cdrv = &I2C_S_DRIVER_BLOCKING;       // defined in the <shield>.h file
    BOARD_InitPins();                   // defined in pin_mux.c, initializes pkg pins
    BOARD_BootClockRUN();               // defined in clock_config.c, initializes clocks
    BOARD_InitDebugConsole();           // defined in board.c, initializes the OpenSDA port

    I2Cdrv->Initialize(NULL);                                 // Initialize the KSDK driver for the I2C port
    I2Cdrv->Control(ARM_I2C_BUS_SPEED, ARM_I2C_BUS_SPEED_FAST);      // Configure the I2C bus speed

    initializeControlPort(&controlSubsystem);                           // configure pins and ports for the control sub-system
    initializeStatusSubsystem(&statusSubsystem);                        // configure pins and ports for the status sub-system
    initSensorFusionGlobals(&sfg, &statusSubsystem, &controlSubsystem); // Initialize sensor fusion structures
    // "install" the sensors we will be using
    sfg.installSensor(&sfg, &sensors[0], FXLS8952C_I2C_ADDR, 1, (void*) I2Cdrv, FXLS8952_Init,  FXLS8952_Read);
    sfg.installSensor(&sfg, &sensors[1], FXAS21002_I2C_ADDR, 1, (void*) I2Cdrv, FXAS21002_Init, FXAS21002_Read);
    sfg.installSensor(&sfg, &sensors[2], MAG3110_I2C_ADDR,   1, (void*) I2Cdrv, MAG3110_Init, MAG3110_Read);
    sfg.initializeFusionEngine(&sfg);           // This will initialize sensors and magnetic calibration

    event_group = xEventGroupCreate();
    xTaskCreate(read_task, "READ", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 2, NULL);
    xTaskCreate(fusion_task, "FUSION", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL);

    sfg.setStatus(&sfg, NORMAL);                // If we got this far, let's set status state to NORMAL
    vTaskStartScheduler();                      // Start the RTOS scheduler
    sfg.setStatus(&sfg, HARD_FAULT);            // If we got this far, FreeRTOS does not have enough memory allocated
    for (;;) ;
}

static void read_task(void *pvParameters)
{
    uint16_t i=0;                       // general counter variable
    portTickType lastWakeTime;
    const portTickType frequency = 1;   // tick counter runs at the read rate
    lastWakeTime = xTaskGetTickCount();
    while (1)
    {
        for (i=1; i<=OVERSAMPLE_RATE; i++) {
            vTaskDelayUntil(&lastWakeTime, frequency);
            sfg.readSensors(&sfg, i);              // Reads sensors, applies HAL and does averaging (if applicable)
        }
        xEventGroupSetBits(event_group, B0);
    }
}

static void fusion_task(void *pvParameters)
{
    uint16_t i=0;  // general counter variable
    float motion_baseline[3] = {0.0, 0.0, 0.0};
    bool stationary;
    static bool lastStationary;
    uint32_t stationaryCount = 0;
    while (1)
    {
        xEventGroupWaitBits(event_group,    /* The event group handle. */
                            B0,             /* The bit pattern the event group is waiting for. */
                            pdTRUE,         /* BIT_0 and BIT_4 will be cleared automatically. */
                            pdFALSE,        /* Don't wait for both bits, either bit unblock task. */
                            portMAX_DELAY); /* Block indefinitely to wait for the condition to be met. */

        // sfg.runFusion(&sfg);             // Run the actual fusion algorithms
        // Rather than call runFusion directly, this example invokes the lower level
        // calls here.  This allows us to check to see if the board is stationary,
        // and if so, transition to a lower power state.
        sfg.conditionSensorReadings(&sfg);  // magCal is run as part of this
        stationary = motionCheck(
                    sfg.Accel.fGc,      // calibrated accelerometer reading
                    motion_baseline,    // baseline to check new values against
                    0.01,               // changes less than this are ignored
                    120,                // three seconds at 40Hz rate
                    &stationaryCount);
        if (stationary) {
            if (!lastStationary) {  // suspend some operations
                FXAS21002_Idle(&(sensors[1]), &sfg);
                MAG3110_Idle(&(sensors[2]), &sfg);
            }
            sfg.clearFIFOs(&sfg);
        } else {
            if (lastStationary) {   // restart operations
                FXAS21002_Init(&(sensors[1]), &sfg);
                MAG3110_Init(&(sensors[2]), &sfg);
            }
            // fuse the sensor data
            sfg.runFusion(&sfg);
        }

        sfg.applyPerturbation(&sfg);        // apply debug perturbation (testing only)

        sfg.loopcounter++;                  // The loop counter is used to "serialize" mag cal operations
        i=i+1;
        if (i>=4) {                         // Some status codes include a "blink" feature.  This loop
                i=0;                        // should cycle at least four times for that to operate correctly.
                sfg.updateStatus(&sfg);     // This is where pending status updates are made visible
        }
        if (stationary) {
            sfg.queueStatus(&sfg, LOWPOWER);    // assume LOWPOWER status for next pass through the loop
        } else {
            sfg.queueStatus(&sfg, NORMAL);      // assume NORMAL status for next pass through the loop
        }
        sfg.pControlSubsystem->stream(&sfg, sUARTOutputBuffer);      // Send stream data to the Sensor Fusion Toolbox
        lastStationary = stationary;
    }
}

/// \endcode