Enabling printf on NUCLEO-N657 in STM32CubeIDE

[kag_embedded]

I have enabled Serial Wire Viewer (SWV) in my m55 application as I have done with my m4 and m33 projects, but the printf is not appearing in the SWV view.

Are there additional setup required on the NUCLEO-N657 board such as jumper settings or additional software setup?

Thank you.

[KDJEM.1]

Hello @kag_embedded;

Could you please make sure that you:

- Enable TRACE CLOCK AND DEBUG CLOCK in DBGMCU register

- The SWV core clock in STM32CUBEIDE should always be CPU clock/8, the SWV core clock should be 8Mhz

- Configure the SWV ITM Data console

Below an code example of printf:

################CODE BEGIN####################

int __io_putchar(int ch)
 {
   ITM_SendChar(ch);
   return(ch);
 }


int main(void)
{
 GPIO_InitTypeDef gpio_init;

DBGMCU->CR |=0x00300000;
 ITM->TER |= 0x1;
 ITM->TCR |= 0x00001;

  //SWO is Ball U12 or PB5 label on N6
  __HAL_RCC_GPIOB_CLK_ENABLE();
  gpio_init.Mode   = GPIO_MODE_AF_PP;
  gpio_init.Pull   = GPIO_PULLUP;
  gpio_init.Speed   = GPIO_SPEED_FREQ_HIGH;
  gpio_init.Pin    = GPIO_PIN_5;
  gpio_init.Alternate = GPIO_AF0_TRACE;
  HAL_GPIO_Init(GPIOB, &gpio_init);


  HAL_Init();

  /* Initialize LED1 */
  BSP_LED_Init(LED_GREEN);

  while (1)
  {
    /* Toggle LED1 every 500ms */
    BSP_LED_Toggle(LED_GREEN);
    HAL_Delay(500);
    printf("Hello world\n");
  }
}

################CODE END####################

For more information about  Serial Wire Viewer I recommend you to look at AN4948 precisely section "7.3 Printf via SWO/SWV"

If you want also to see the UART output message on the HyperTerminal, I recommend you to look at UART_Printf example. 

I hope this help you.

Thank you.

Kaouthar

[kag_embedded · Accepted solution]

@KDJEM.1 Thank you. Dividing the CPU clock by 8 resolved my issue.