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How to get input from TerraTerm, and then spit it back out?

cannadya1

Hey all, so I'm trying to make a program that will take user input from TerraTerm, and then echo it right back to TerraTerm. So if I typed "Hello World" and hit enter, it'd output "Hello World" at me. I'm starting from the Hello World program, so my c file started from 

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
 
 
int main()
{
    init_platform();
 
    printf("Hello, world!\n\r");
   
    cleanup_platform();
    return 0;
}
 
Which works just fine. I've added some lines that I found from a google search and now I have this:
 
  #include <stdio.h>
  #include "platform.h"
  #include "xil_printf.h"
   
   
  int main()
  {
      init_platform();
      char command[64];
   
      printf("Hello, world!\n\r");
      printf("Type something!:\n\r");
   
      memset(command, '\0', 64);//"reset" our holder string
      int i = 0;
      do{
      command[i] = inbyte();
      fflush(stdout);
      i++;
      }while(command[i-1] != '\r');//Our "command" will have a return character included at the end.
      putchar(command[i]);
      printf("\n");//But we still need a new line character (if we want one)
   
      cleanup_platform();
      return 0;
  }
   
  This will let me type in a user input, but when I hit enter it won't spit anything back out at me. It seems to freeze or something. Does anyone have any advice? 
   
  • 0

    It seems my probem is in printf as the following program will only print "end program"

     

    int main()
    {
        init_platform();
     
        char command[64];
        memset(command, '\0', 64);
        int i = 0;
        fflush(stdout);
        command[i] = 'John';
        printf('%c',command[i]);
        printf("\n");
     
        printf("End Program.\n\r");
     
        cleanup_platform();
        return 0;
    }
     
    What am I doing wrong with printf that is making the program skip over it? 
  • 0

    Solved. 

     

    I was running in debug and leaving the processor in "suspended" mode. Had to hit F8 to get it running. Here is the final working code to accept user input and then print it back out. Ideally it would show the typed input as well. I think I can maket hat happen with some changes. 

     

    int main()
    {
        init_platform();
     
        //Set up variables
        char command[64];
        int i = 0;
        memset(command, '\0', 64);//"reset" our holder string
     
        //Print hello and request user input
        printf("Hello, world!\n\r");
        printf("Type something!:\n\r");
     
        //Record user input
        do{
        command[i] = inbyte();
        fflush(stdout);
        i++;
        }while(command[i-1] != '\r');//Our "command" will have a return character included at the end.
     
        //Display user input on serial interface
        printf("Input: ");
        for(int j = 0; j<i; j++){
        printf("%c",command[j]);
        }
        printf("\n");//But we still need a new line character (if we want one)
     
        //End program
        printf("End Program.\n\r");
        cleanup_platform();
        return 0;
    }