目的
少し容量に余裕が出てきた人むけ
参考
Where is itoa() ?



#include "mbed.h"

//Serial pc(USBTX, USBRX); // tx, rx
//Serial pc(SERIAL_TX, SERIAL_RX); //767
RawSerial pc(PA_2, PA_3); //010

/*
** reverse string in place 
*/
void reverse(char *s) {
char *j;
int c;
 
  j = s + strlen(s) - 1;
  while(s < j) {
    c = *s;
    *s++ = *j;
    *j-- = c;
  }
}

/* itoa:  convert n to characters in s */
 void itoa(int n, char s[])
 {
     int i, sign;
 
     if ((sign = n) < 0)  /* record sign */
         n = -n;          /* make n positive */
     i = 0;
     do {       /* generate digits in reverse order */
         s[i++] = n % 10 + '0';   /* get next digit */
     } while ((n /= 10) > 0);     /* delete it */
     if (sign < 0)
         s[i++] = '-';
     s[i] = '\0';
     reverse(s);
 }


int main() {

    char ss1[16]; //文字列
    int ii; //ループカウンター

    //無限ループ
    while(1) {

        itoa(1234,ss1);
        ii=0; //ループカウンター
        while(ss1[ii]!=0){
            
            //一文字出力
            pc.putc(ss1[ii]);ii++;
                        
        } //while
        pc.putc('\r');
        pc.putc('\n');

        //1秒の待ち
        wait_ms(1000);
        
    } //while
} //main

//容量削減
void error(const char* format, ...){}