File content as of revision 3:6cc06b58870b:

#include "mbed.h"

DigitalIn   1sIP(p5);
DigitalIn   400msIP1(p6);
DigitalIn   400msIP2(p7);
AnalogIn    800msIP1(p19);
AnalogIn    800msIP2(p20);

DIgitalOut  bit4(LED1);
DIgitalOut  bit3(LED2);
DIgitalOut  bit2(LED3);
DIgitalOut  bit1(LED4);

int IP1s,IP400ms1,IP400ms2 = 0;
int IP800ms1[4],IP800ms2[4] = 0;
int freq = 0;
int aver_anl1,aver_anl2 = 0;
int digi_val = 0;

int ero_code = 0;

int flag4task3 = 0;
int run_task = 0;
int led_show = 0;

int main() {
    
    while(1)
    {
        }                  
    
}

// wait(1) -> waiting 10ms
void task1_check_wava1s()                           // check the square wave per second
{
    IP1s = 0;
    for(int i = 0; i < 1000; i++)                   //the accuracy is 1us
        if(1sIP == 1)
            IP1s++;                                 //the lasting time of the impulse of square wave   
}

void task2_checkDIP400ms()                          //check the SWes per 400ms
{
    if( 400msIP1 != 0 )
        IP400ms1 = 1;
    else IP400ms1 = 0;
    
    if( 400msIP2 !=0 )
        IP400ms2 = 1;
    else TP400ms2 = 0;
    
}

void task3_checkAIP800ms()
{   
    IP800ms1[flag4task3] = 800msIP1;
    IP800ms2[flag4task3] = 800msIP2;
    
    flag4task3++;
    flag4task3 = flag4task3%4;
}
    
void task4_display2s()
{
    double freq2;
    freq2 = 1/IP1s;
    freq2 = freq2*1000000;
    freq = freq2/1;                                  //frenquency of square wave
    
    double aver_anl3,aver_anl4 = 0;
    aver_anl3 = IP800ms1[0] + IP800ms1[1] + IP800ms1[2] + IP800ms1[3];
    aver_nal3 = aver_anl3/4;
    
    aver_nal1 = aver_anl3/1;                        //averaging analog input1 
    
    aver_anl4 = IP800ms2[0] + IP800ms2[1] + IP800ms2[2] + IP800ms2[3];
    aver_nal4 = aver_anl4/4;
    
    aver_nal2 = aver_anl4/1;                        //averaging analog input2
       
    if ( IP400ms2 ==0 && IP400ms1 ==0 )  digi_val = 00;
    else if ( IP400ms2 ==0 && IP400ms1 ==1 )   digi_val = 01;
    else if ( IP400ms2 ==1 && IP400ms1 ==0 )   digi_val = 10;
    else                                       digi_val = 11;
                                                    // digital value

    //   show out all the values
        
    
}

void task5_check_SWes1.8s()
{
    if((IP400ms1 == 1) && (aver_anl1 > aver_anl2))   ero_code = 3;
    else ero_code = 0;                              //error code
    
    if(IP400ms2 == 1)   
        run_task = 1;
    else 
        run_task = 0;
    
}

void run_task1.5s()                                 //blink led
{
    led_show = led_show%15;
    
    int num_led = led_show;
    
    if(num_led > 7) {num_led = num_led - 8; bit4 = 1 }
    else bit4 = 0;
    
    if(num_led > 3) {num_led = num_led - 4; bit3 = 1}
    else bit3 = 0;
    
    if(num_led > 1) {num_led = num_led - 2; bit2 = 1}
    else bit2 = 0;
    
    bit1 = num;
    
    led_show++;
}

void task6_updated5s()                              //update  A.Frequency value  B.digital input values  C.Filtered analogue values 
{                                                           
                                                            

{