File content as of revision 7:8065e844e99a:

#include "mbed.h"
#include "rtos.h"
#include "ds3231.h"
#include "DHT.h"

#define ESC 0x1B

#define I2C_SDA D14
#define I2C_SCL D15
#define DHT_EN_PIN D7
#define DHT_PIN D6
#define M_DIR_PIN D4
#define M_SPE_PIN D5

void setupRTC();
void get_user_input(char* message, uint8_t min, uint8_t max, uint32_t* member);
void get_user_input(char* message, uint8_t min, uint8_t max, bool* member);
int readDHT(float* temperature, float* humidity, float* dewPoint);
int measure(time_t* ts, float* temperature, float* humidity, float* dewPoint);
int setMotor(int direction, double speed);
void wakeupFromRTC(void);

Ds3231 rtc(D14, D15);

PwmOut m_speed(D4);
DigitalOut m_direction(D5);

DHT DHTSensor(D6, DHT11);
DigitalOut DHTEnable(D7);

InterruptIn iRTC(D8);

int main(void)
{
    int measureError = 0;
    float temperature = 0.0,  humidity = 0.0,  dewPoint = 0.0;
    int motorDirection = 0;
    double motorSpeed = 0.0;
    char buffer[32];
    time_t ts;

    //setupRTC();

    iRTC.rise(wakeupFromRTC);

    while(true) {
        //printf("%c[2J", ESC); //clear screen
        sleep();
        ts = rtc.get_epoch();
        measureError = measure(&ts,&temperature,&humidity,&dewPoint);

        if(!measureError) {
                printf("\nTime as seconds since January 1, 1970 = %d\n", ts);
                printf("Temperature in Celcius: %4.2f\n", temperature);
                printf("Humidity is %4.2f, Dewpoint: %4.2f\n", humidity, dewPoint);
                setMotor(motorDirection, motorSpeed);
        }
        wait(1);
    }//loop
}
int measure(time_t* ts, float* temperature, float* humidity, float* dewPoint)
{
    int DHTError = 0;
    *ts = rtc.get_epoch();
    if(*ts<=0)
        return 1;
    DHTError = readDHT( temperature, humidity, dewPoint);
    if(DHTError) {
        printf("DHTError: %d\n", DHTError);
        return 2;
    }
    return 0;

}
int readDHT(float* temperature, float* humidity, float* dewPoint)
{
    int error = 0;
    DHTEnable = 1;
    wait(2);
    error = DHTSensor.readData();
    if (0 == error) {
        *temperature = DHTSensor.ReadTemperature(CELCIUS);
        *humidity = DHTSensor.ReadHumidity();
        *dewPoint = DHTSensor.CalcdewPoint(*temperature, *humidity);
    }
    DHTEnable=0;
    return error;
}

int setMotor(int direction, double speed)
{
    if(speed<0 or speed>255)
        return 1;
    else {
        m_speed = speed;
        if(direction)
            m_direction=1;
        else
            m_direction=0;
    }
    return 0;
}

void setupRTC()
{

    //default, use bit masks in ds3231.h for desired operation
    ds3231_cntl_stat_t rtc_control_status = {0,0};
    ds3231_time_t rtc_time;
    ds3231_calendar_t rtc_calendar;

    rtc.set_cntl_stat_reg(rtc_control_status);

    //get day from user
    get_user_input("\nPlease enter day of week, 1 for Sunday (1-7): ", 1,
                   7, &rtc_calendar.day);

    //get day of month from user
    get_user_input("\nPlease enter day of month (1-31): ", 1, 31,
                   &rtc_calendar.date);

    //get month from user
    get_user_input("\nPlease enter the month, 1 for January (1-12): ", 1,
                   12, &rtc_calendar.month);

    //get year from user
    get_user_input("\nPlease enter the year (0-99): ",0, 99,
                   &rtc_calendar.year);

    //Get time mode
    get_user_input("\nWhat time mode? 1 for 12hr 0 for 24hr: ", 0, 1,
                   &rtc_time.mode);

    if(rtc_time.mode) {
        //Get AM/PM status
        get_user_input("\nIs it AM or PM? 0 for AM 1 for PM: ", 0, 1,
                       &rtc_time.am_pm);
        //Get hour from user
        get_user_input("\nPlease enter the hour (1-12): ", 1, 12,
                       &rtc_time.hours);
    } else {
        //Get hour from user
        get_user_input("\nPlease enter the hour (0-23): ", 0, 23,
                       &rtc_time.hours);
    }

    //Get minutes from user
    get_user_input("\nPlease enter the minute (0-59): ", 0, 59,
                   &rtc_time.minutes);


    //Get seconds from user
    get_user_input("\nPlease enter the second (0-59): ", 0, 59,
                   &rtc_time.seconds);



    //Set the time, uses inverted logic for return value
    if(rtc.set_time(rtc_time)) {
        printf("\nrtc.set_time failed!!\n");
        exit(0);
    }

    //Set the calendar, uses inverted logic for return value
    if(rtc.set_calendar(rtc_calendar)) {
        printf("\nrtc.set_calendar failed!!\n");
        exit(0);
    }


}

/**********************************************************************
* Function: get_user_input()
* Parameters: message - user prompt
*             min - minimum value of input
*             max - maximum value of input
*             member - pointer to struct member
* Returns: none
*
* Description: get time/date input from user
*
**********************************************************************/
void get_user_input(char* message, uint8_t min, uint8_t max, uint32_t* member)
{
    uint32_t temp;

    do {
        printf("\n%s", message);

        //for some reason mbed doesn't like a pointer to a member in scanf
        //term.scanf("%d", member); works with gcc on RPi
        scanf("%d", &temp);

        *member = temp;

        if((*(member)< min) || (*(member) > max)) {
            printf("\nERROR-RTI");
        }
    } while((*(member) < min) || (*(member) > max));
}


void get_user_input(char* message, uint8_t min, uint8_t max, bool* member)
{
    uint32_t temp;

    do {
        printf("\n%s", message);

        //for some reason mbed doesn't like a pointer to a member in scanf
        //term.scanf("%d", member); works with gcc on RPi
        scanf("%d", &temp);

        *member = temp;

        if((*(member)< min) || (*(member) > max)) {
            printf("\nERROR-RTI");
        }
    } while((*(member) < min) || (*(member) > max));
}
void wakeupFromRTC(void){}