Hi everyone,
I cannot start SWO trace (nothing received in debug window) with STM32F103C8T6.
Here is my main.c file:
/**
******************************************************************************
* @file : main.c
* @author : Auto-generated by STM32CubeIDE
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
#include <stdint.h>
#if !defined(__SOFT_FP__) && defined(__ARM_FP)
#warning "FPU is not initialized, but the project is compiling for an FPU. Please initialize the FPU before use."
#endif
#include<stdio.h>
int main(void)
{
printf("Hello world");
/* Loop forever */
for(;;);
}
And here is my syscalls.c file
/**
******************************************************************************
* @file syscalls.c
* @author Auto-generated by STM32CubeIDE
* @brief STM32CubeIDE Minimal System calls file
*
* For more information about which c-functions
* need which of these lowlevel functions
* please consult the Newlib libc-manual
******************************************************************************
* @attention
*
* Copyright (c) 2020-2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes */
#include <sys/stat.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/times.h>
/////////////////////////////////////////////////////////////////////////////////////////////////////////
// Implementation of printf like feature using ARM Cortex M3/M4/ ITM functionality
// This function will not work for ARM Cortex M0/M0+
// If you are using Cortex M0, then you can use semihosting feature of openOCD
/////////////////////////////////////////////////////////////////////////////////////////////////////////
//Debug Exception and Monitor Control Register base address
#define DEMCR *((volatile uint32_t*) 0xE000EDFCU )
/* ITM register addresses */
#define ITM_STIMULUS_PORT0 *((volatile uint32_t*) 0xE0000000 )
#define ITM_TRACE_EN *((volatile uint32_t*) 0xE0000E00 )
void ITM_SendChar(uint8_t ch)
{
//Enable TRCENA
DEMCR |= ( 1 << 24);
//enable stimulus port 0
ITM_TRACE_EN |= ( 1 << 0);
// read FIFO status in bit [0]:
while(!(ITM_STIMULUS_PORT0 & 1));
//Write to ITM stimulus port0
ITM_STIMULUS_PORT0 = ch;
}
/* Variables */
extern int __io_putchar(int ch) __attribute__((weak));
extern int __io_getchar(void) __attribute__((weak));
char *__env[1] = { 0 };
char **environ = __env;
/* Functions */
void initialise_monitor_handles()
{
}
int _getpid(void)
{
return 1;
}
int _kill(int pid, int sig)
{
(void)pid;
(void)sig;
errno = EINVAL;
return -1;
}
void _exit (int status)
{
_kill(status, -1);
while (1) {} /* Make sure we hang here */
}
__attribute__((weak)) int _read(int file, char *ptr, int len)
{
(void)file;
int DataIdx;
for (DataIdx = 0; DataIdx < len; DataIdx++)
{
*ptr++ = __io_getchar();
}
return len;
}
__attribute__((weak)) int _write(int file, char *ptr, int len)
{
(void)file;
int DataIdx;
for (DataIdx = 0; DataIdx < len; DataIdx++)
{
//__io_putchar(*ptr++);
ITM_SendChar(*ptr++);
}
return len;
}
int _close(int file)
{
(void)file;
return -1;
}
int _fstat(int file, struct stat *st)
{
(void)file;
st->st_mode = S_IFCHR;
return 0;
}
int _isatty(int file)
{
(void)file;
return 1;
}
int _lseek(int file, int ptr, int dir)
{
(void)file;
(void)ptr;
(void)dir;
return 0;
}
int _open(char *path, int flags, ...)
{
(void)path;
(void)flags;
/* Pretend like we always fail */
return -1;
}
int _wait(int *status)
{
(void)status;
errno = ECHILD;
return -1;
}
int _unlink(char *name)
{
(void)name;
errno = ENOENT;
return -1;
}
int _times(struct tms *buf)
{
(void)buf;
return -1;
}
int _stat(char *file, struct stat *st)
{
(void)file;
st->st_mode = S_IFCHR;
return 0;
}
int _link(char *old, char *new)
{
(void)old;
(void)new;
errno = EMLINK;
return -1;
}
int _fork(void)
{
errno = EAGAIN;
return -1;
}
int _execve(char *name, char **argv, char **env)
{
(void)name;
(void)argv;
(void)env;
errno = ENOMEM;
return -1;
}
and when I open SWV ITM data console, select ITM stimulus port : 0 , start trace and press F8. Nothing displayed on my console:
So please tell me what's problem and how I can fix that! Thanks!!!
