Using sprintf to change a double to a string in MPLAB IDE v6.20

Question

I have been using the console to print (through UART) it has always worked fine but for some reason every time I use sprintf it seems to lock up the system and not allow me to print the string value or any other string in a buffer.

This is the part of my code that contributes to it.I am using MPLAB which has the harmony framework and uses FreeRTOS.

#include "app.h"
#include <stdio.h>
#include <string.h>
#include "system/console/sys_console.h"
#include "peripheral\sercom\usart\plib_sercom_usart_common.h"
#include "system/console/src/sys_console_uart.h"
#include "peripheral\port\plib_port.h"
#include "interrupts.h"
#include "peripheral\sercom\i2c_master\plib_sercom1_i2c_master.h"
#include "MC3416_Accel.h"

SYS_CONSOLE_HANDLE New_Console;
uint8_t limit = 0;
static char tilt_string[20];

void Acc_Task (void){
 if (limit < 1)
    {
     limit++;
     
     mc3416_accel_init();
     mc3416_accel_read_tilt();

     double tilt = mc3416_accel_get_tilt();
       
     while (SYS_CONSOLE_Status(New_Console) != SYS_STATUS_READY)
     {}
       
    int result = sprintf(tilt_string,"%.2f",tilt);
       
       
    SYS_CONSOLE_Write(New_Console, tilt_string, strlen(tilt_string));
  }
}


//The accelerometer initialize function calls on a function that sets the accel to wake_mode (i2c communication) and uses this function to send a message when finished.

/***************************************************************************
Function to send a message to the console
****************************************************************************/
void mc3416_send_message(const char *message)
{
    
    SYS_CONSOLE_Write(New_Console, message ,strlen(message));
    
    while(SYS_CONSOLE_Status(New_Console) != SYS_STATUS_READY)
    {
        
    }

}

I can see that my value does come and gets changed into a string (through debugging) but for some reason it doesn't allow anything to happen after.

I have tried snprintf and also not printing the string from sprintf but something else after calling sprintf it still does not work. Please help

I wrote an elementary way to convert the double to a string (doubleToString(tilt,tilt_string,3);) and it does work and allows everything else to work so I thought it was safe to assume the while loop worked ok. I placed it in the same place I had sprintf.

void intToString(int num, char *str) {
     int i = 0;
     if (num == 0) {
         str[i++] = '0';
     } else {
     
         if (num < 0) {
             str[i++] = '-';
             num = -num;
         }
    
         int divisor = 1;
         while (num / divisor > 0) {
             divisor *= 10;
         }
         divisor /= 10;
         while (divisor > 0) {
             int digit = num / divisor;
             str[i++] = '0' + digit;
             num %= divisor;
              divisor /= 10;
         }
     }

     str[i] = '\0';
 }

void doubleToString(double num, char *str, int precision) {

 int intPart = (int)num;
 intToString(intPart, str);

 
 while (*str != '\0') {
     str++;
 }

 if (precision > 0) {
     *str++ = '.';
 }

 double fracPart = num - intPart;
 for (int i = 0; i < precision; ++i) {
     fracPart *= 10;
     int digit = (int)fracPart;
     *str++ = '0' + digit;
     fracPart -= digit;
 }

 *str = '\0';
}