main.c

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/* STD libraries*/
#include <stdio.h>
#include <stdlib.h>

/* FreeRTOS includes */
#include "FreeRTOSConfig.h"
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

/* emlib includes */
#include "em_chip.h"

/* emdrv includes */
#include "sleep.h"

/* our includes */
#include "BSP.h"

#define TOGGLE_TASK_PRIORITY          (tskIDLE_PRIORITY + 1)

#define QUEUE_LENGTH (10)


QueueHandle_t adc_queue;


static void TaskPWMCtrl(void *pParameter) {

    (void) pParameter;
    uint32_t my_pwm;
    uint32_t recv_pwm;
    uint32_t pwm_value;

    PWMConfig();

    for (;;) {
        if (xQueueReceive(adc_queue, &recv_pwm, portMAX_DELAY)) {
            my_pwm = recv_pwm;

            /*
             * Value received from ADC tssk has a range from 0 to 4095 (12 bits)
             * We may map these values to a 0 to PWM_FREQ in 6 steps
             */
            if (my_pwm > PWM_FREQ) {
                my_pwm = PWM_FREQ;
            }

            pwm_value = my_pwm;

            TIMER_CompareBufSet(TIMER1, 1, pwm_value);
        }
    }
}

static void TaskADCRead(void *pParameter) {

    (void) pParameter;
    uint32_t ADCvalue;

    ADCConfig();

    while (1) {
        ADC_Start(ADC0, adcStartSingle);

        while (ADC0->STATUS & ADC_STATUS_SINGLEACT);

        ADCvalue = ADC_DataSingleGet(ADC0);
        xQueueSend(adc_queue, &ADCvalue, portMAX_DELAY);

        vTaskDelay( pdMS_TO_TICKS(250));
    }
}

int main(void) {
    /* Chip errata */
    CHIP_Init();

    /* Init functions for our BSP */
    BSP_Init();

    /* Init SLEEP library */
    SLEEP_Init(NULL, NULL);
#if (configSLEEP_MODE < 3)
    SLEEP_SleepBlockBegin((SLEEP_EnergyMode_t) (configSLEEP_MODE + 1));
#endif

    /* Create Queue */
    adc_queue = xQueueCreate(QUEUE_LENGTH, sizeof(uint32_t));

    /* Create our first task */
    xTaskCreate(TaskPWMCtrl, (const char *) "PWMCtrl",
    configMINIMAL_STACK_SIZE, NULL, TOGGLE_TASK_PRIORITY, NULL);

    xTaskCreate(TaskADCRead, (const char *) "ADCRead",
    configMINIMAL_STACK_SIZE, NULL, TOGGLE_TASK_PRIORITY, NULL);

    /* Start FreeRTOS Scheduler */
    vTaskStartScheduler();

    return 0;
}

/*
 * @}
 */