File content as of revision 0:47259286a496:

//Ini Kodingan untuk mengirim data int signed (int32_t) antar nukleo
//Slave yg ngirim data
//bisa error kalo pencet tombolnya kecepetan datanya jadi beda
#include "mbed.h"

Serial slave(PC_10, PC_11);
DigitalIn BlueButton(USER_BUTTON);  // This is Blue-Button and is on NUCLEO-L153RE
 
#define Pressed 0                   
#define NotPressed 1
int32_t numberToSend;              //data yang dikirim
double  a   = 2137.32422;
uint8_t A,B,C,D;                    //variabel untuk convert int ke char
uint32_t temp;                      //temporary int yg dishift

int main(){
    while(1){
        if (BlueButton == Pressed){
            numberToSend    = (int32_t) 2245.24556;//(a*1000);
            temp = numberToSend>>24;
            A = (uint8_t) temp;
            temp = (numberToSend<<8)>>24;
            B = (uint8_t) temp;
            temp = (numberToSend<<16)>>24;
            C = (uint8_t) temp;
            temp = (numberToSend<<24)>>24;
            D = (uint8_t) temp;
            slave.putc(A);
            slave.putc(B);
            slave.putc(C);
            slave.putc(D);
            }
        
    }
}