Debugger does not run unless using MicroLIB

Thanks for the article link, it's helpful but I'm still running into issues. I think you're right about semihosting, since I can see that my program is indeed stopping at a "BKPT 0xAB" instruction.

1.
When trying to solve by using the Keil Compiler Pack as suggested first, I redirect STDIN and STDERR to User (and add the default user template files to my source files). I still have STDOUT redirected to EVR (and Event Recorder DAP enabled), as outlined on the www.keil.com/.../_retarget__examples_er.html page. After compiling this, the same underlying breakpoint occurs as before.

2.
I also tried selecting STDOUT redirect to User (with default user template file), but the breakpoint remains. But this is without printf output, which I need anyways.

3.
I tried the second suggestion to turn on MicroLIB, but I can't compile ARM's retarget_io.c because of __stdout, fputc, fgetc, and abort conflicts.

4.
I also tried the third suggestion to add a retarget.c file according to the http://www.keil.com/support/man/docs/gsac/gsac_retargetcortex.htm page. However, this caused compiler conflicts with __stdout, __stdin, fputc, fgetc, and ferror in <stdio.h> [example warning: #2681-D: name linkage conflicts with previous declaration of variable "std::__stdout" (declared at line 138 of "C:\Keil_v5\ARM\ARMCC\Bin\..\include\stdio.h")].

I feel like I'm getting close... or at least figuring out the right question to ask. How do I basically redirect STDOUT to Event Recorder (or other simulator printf output) and disable the semihosting breakpoints?

Thanks for the article link, it's helpful but I'm still running into issues. I think you're right about semihosting, since I can see that my program is indeed stopping at a "BKPT 0xAB" instruction.

1.
When trying to solve by using the Keil Compiler Pack as suggested first, I redirect STDIN and STDERR to User (and add the default user template files to my source files). I still have STDOUT redirected to EVR (and Event Recorder DAP enabled), as outlined on the www.keil.com/.../_retarget__examples_er.html page. After compiling this, the same underlying breakpoint occurs as before.

2.
I also tried selecting STDOUT redirect to User (with default user template file), but the breakpoint remains. But this is without printf output, which I need anyways.

3.
I tried the second suggestion to turn on MicroLIB, but I can't compile ARM's retarget_io.c because of __stdout, fputc, fgetc, and abort conflicts.

4.
I also tried the third suggestion to add a retarget.c file according to the http://www.keil.com/support/man/docs/gsac/gsac_retargetcortex.htm page. However, this caused compiler conflicts with __stdout, __stdin, fputc, fgetc, and ferror in <stdio.h> [example warning: #2681-D: name linkage conflicts with previous declaration of variable "std::__stdout" (declared at line 138 of "C:\Keil_v5\ARM\ARMCC\Bin\..\include\stdio.h")].

I feel like I'm getting close... or at least figuring out the right question to ask. How do I basically redirect STDOUT to Event Recorder (or other simulator printf output) and disable the semihosting breakpoints?

Hello Tom,

Have you seen this thread?

http://www.keil.com/forum/10998/usart-use-of-printf/

Thanks Ron, I have stumbled upon that thread, but I wasn't sure of what to take away from it. Even though my project already compiles (see #1 from my previous post), it's just a matter of getting the compiler to not include the extra semihosting breakpoints. Do I need to somehow compile my Pack-related retarget_io.c/EventRecorder.c files separately without the --cpp11 flag?

I was finally able to solve this problem! After reading many articles including:

www.onarm.com/.../
stackoverflow.com/.../1898523

I built with the following retarget.c file:

#include <stdio.h>
#include <rt_misc.h>
#include <rt_sys.h>

#pragma import(__use_no_semihosting)

int stderr_putchar (int ch) {
  return -1;
}

int stdin_getchar (void) {
  return -1;
}

void ttywrch (int ch) {
}

void _sys_exit(int return_code) {
label:  goto label;  /* endless loop */
}

The key line not found in most retarget examples is #include <rt_sys.h>... without it I get the L6915E error. Maybe it is only needed for my particular project with external libraries.