How to use printf() function with stm32cubeMX + sw4stm32

[gae089]

Posted on September 01, 2015 at 19:13

Hi to every one,

It's the first time that I use the STM32CubeMX + SWSTM32 to program a stm32f401RE board. I have done already some example project but I can't use the printf() function to communicate  with a terminal ( Tera Term) on the PC. Somebody can explain me how I can do it?Thank you in advance!!

[Daniele Paolini]

Posted on April 13, 2018 at 12:55

 Hello Nesrine,

Do the examples work also for NUCLEO-L476RG Boards? Because i noticed that under example folder :

..\STM32Cube\en.stm32cubel4\STM32Cube_FW_L4_V1.11.0\Projects\NUCLEO-L476RG\Examples\UART

there are no examples for printf().

Anyway I tried implementation suggested by marinoni.enrico.003 in the link

--------------------

Hi,

look this examples:

http://www.emcu.eu/how-to-implement-printf-for-send-message-via-usb-on-stm32-nucleo-boards-using-atollic/

http://www.emcu.eu/how-to-implement-printf-for-send-message-via-usb-on-stm32-nucleo-boards/

-------------------------

but my board sends only a [00] to the terminal and then it stucks and does nothing...

all the files were generated with STM32cubeMX and main.c file looks like below:

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32l4xx_hal.h"
#include "i2c.h"
#include "usart.h"
#include "gpio.h"
 
/* USER CODE BEGIN Includes */
#include "Board_Buttons.h"
#include <stdio.h>
#include <string.h>
/* USER CODE END Includes
 
 
 
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
int nLoop=0;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
 
 
 
int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration----------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_I2C1_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin); //Toggle LED
HAL_Delay(1000); //Delay 1 Seconds
 
  /* USER CODE END 2 */
 
int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration----------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_I2C1_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin); //Toggle LED
HAL_Delay(1000); //Delay 1 Seconds
HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin);//Toggle LED
HAL_Delay(500); //Delay 0,5 Seconds
HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin);//Toggle LED
 
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_15);  // set pin pin15 to 1
//Toggle pin pin15
  /* USER CODE END 2 */
 
 
 
void SystemClock_Config(void)
{
 
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLN = 10;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART2
                              |RCC_PERIPHCLK_I2C1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
  PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
  PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure the main internal regulator output voltage 
    */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
 
    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
 
/* USER CODE BEGIN 4 */
int __io_putchar(int ch)
{
 uint8_t c[1];
 c[0] = ch & 0x00FF;
 HAL_UART_Transmit(&huart2, &*c, 1, 10);
 return ch;
}
 
int _write(int file,char *ptr, int len)
{
 int DataIdx;
 for(DataIdx= 0; DataIdx< len; DataIdx++)
 {
 __io_putchar(*ptr++);
 }
return len;
}
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @param  file: The file name as string.
  * @param  line: The line in file as a number.
  * @retval None
  */
void _Error_Handler(char *file, int line)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  while(1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
 
/**
  * @}
  */
 
/**
  * @}
  */

Thank you in advice for your support

[Tesla DeLorean]

Posted on April 13, 2018 at 16:59

This form looks awful

HAL_UART_Transmit(&huart2, &*c, 1, 10);

This might work better

HAL_UART_Transmit(&huart2, &c[0], 1, 10);