Running native C programs with ndless 4.5

[klausen]

So now that I've installed ndless 4.5 on to my handheld and installed the ndless-sdk on my computer (ubuntu 18.04 lts), how I do I actually run a program written in C on my ti nspire? For example, the following method seems to compile:

Code: Select all

#include <stdio.h>
#include <stdlib.h>
#include <os.h>

int main()
{
  int a;
  printf("Enter a number: ");
  scanf("%d",&a);

  printf("you entered %d\n",a);

  return 0;
}

Code: Select all

nspire-gcc -Wall -W -marm -Os -c practice.c -o practice.o
mkdir -p .
nspire-ld practice.o -o practice.elf -Wl,--nspireio
genzehn --input practice.elf --output practice.tns.zehn --name "practice"
make-prg practice.tns.zehn practice.tns
rm practice.tns.zehn

But when load the .tns file to my nspire I can't get it to run normally. The screen is black with no prompt unless I enter a number. But when I enter a number the program executes and then instantly terminates. How do you run programs with normal user I/O?

[Adriweb]

You may want to use nspire-io. which provides a console-like UI and IO features. See the examples here: https://github.com/Vogtinator/nspire-io ... lo/hello.c

[klausen]

I'm not seeing a directory named "lib", should I just copy the "include" directory to my .ndless directory?

[Adriweb]

I guess you need to build it first?

I'll point Vogtinator to this topic just in case

[Vogtinator]

No need to build anything - the ndless sdk contains a prebuilt version of nspire-io.

The "-Wl,--nspireio" option works fine, but your program has two issues:

- It doesn't wait for the user after printing the final message, so it just quits.
- Stdout is line-buffered by default, which means only messages terminated by a newline are shown.

By disabling the buffer and waiting for a second, the program works as you expect:

Code: Select all

#include <stdio.h>
#include <stdlib.h>
#include <os.h>

int main()
{
  int a;
  setbuf(stdout, NULL);
  printf("Enter a number: ");
  scanf("%d",&a);

  printf("you entered %d\n",a);
  msleep(1000);

  return 0;
}