File content as of revision 0:024bef3a96e8:

#include "mbed.h"

DigitalOut myled(LED1);
#define acm 1

#if acm==1
Serial serial(USBTX, USBRX);
#endif

void print_stng(char *stng)  // operate at low priority
{
#if acm == 0    
   printf( "%s",stng);
#else
    serial.printf( "%s",stng);
#endif
}

char stng[300];
int pass;
int main() {
    pass=0;
       wait(2.0);
#if acm == 1   
   serial.baud(115200);  // set baude rate if serial port
#endif
       wait(2.0);
    while(1) {
        sprintf(stng,"printstring 1 %d \r\n",pass++);
        print_stng(stng);
        myled = 1;
        wait(2.0);
       sprintf(stng,"printstring 2 %d \r\n",pass++);
        print_stng(stng);
        myled = 0;
        wait(2.0);
    }
}

/*
here is the crazy output of minicom set to 115200 baud on a Ubuntu linux systems 
prinsting 0                                                                                                
printstring 2 1                                                                                            
pristring 1 2                                                                                              
pritstring 2 3                                                                                             
pristring 1                                                                                                
printstring  5                                                                                             
printstring 1 6                                                                                            
printstng 2 7                                                                                              
�ά��߬                                                                                                       
                                                                                                           
        �ά��ߍ                                                                                              
             J8�ά                                                                                          
ά�ϬZ8printsri                                                                                              
               prinstr 2 15                                                                                
printstring 1 16                                                                                           
printstring 2 17                                                                                           
printstring 1 18                                                                                           
printstring 2 19                                                                                           
printstring 1 20                                                                                           
printstring 2 21                                                                                           
printstring 1 22                                                                                           
printstring 2 23                                                                                           
printstring 1 24                                                                                           
printstring 2 25                                                                                           
printstring 1 26                                                                                           
printstring 2 27   correct from here on      
*/