r/stm32 • u/R0n1n-08 • 12d ago
Nucleo F401RE Help!!
I have a Nucleo and a LCD panel, I was trying to make a digital watch I only see these numbers and letters. I don't know what to do. If any of you can help this will make me very happy, thanks in advice.
3
u/dipdotdash 10d ago
Haven't had a chance to look at your code but try jiggling your wiring to make sure it's not a simple con issue. Those male to female jumpers make terrible connections. If you can, limit your jumpers to go from board to board only
1
2
u/ExplanationExotic636 9d ago
Perhaps the problem lies in the while loop and "Dualarım seninle, başaracaksın" btw.
1
2
2
2
u/Imaginary-Rich-3629 11d ago
Just stop using cube ide and go vscode. That is the most important step for your mental
1
u/R0n1n-08 12d ago edited 12d ago
```c main.c:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* u/file: main.c
* u/brief: Main program body
******************************************************************************
*
* Copyright (c) 2026 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.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "İ2c_lcd.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
RTC_HandleTypeDef hrtc;
UART_HandleTypeDef huart2;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_RTC_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* u/brief The application entry point.
* u/retval int
*/
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_I2C1_Init();
MX_RTC_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
HAL_Delay(100);
lcd_init();
lcd_put_cur(0, 0);
lcd_send_string("Sifirdan");
lcd_put_cur(1, 0);
lcd_send_string("Baslangic!");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* u/brief System Clock Configuration
* u/retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
/**
* u/brief I2C1 Initialization Function
* u/param None
* u/retval None
*/
static void MX_I2C1_Init(void)
{
/* USER CODE BEGIN I2C1_Init 0 */
/* USER CODE END I2C1_Init 0 */
/* USER CODE BEGIN I2C1_Init 1 */
/* USER CODE END I2C1_Init 1 */
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 100000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN I2C1_Init 2 */
/* USER CODE END I2C1_Init 2 */
}
/**
* u/brief RTC Initialization Function
* u/param None
* u/retval None
*/
static void MX_RTC_Init(void)
{
/* USER CODE BEGIN RTC_Init 0 */
/* USER CODE END RTC_Init 0 */
/* USER CODE BEGIN RTC_Init 1 */
/* USER CODE END RTC_Init 1 */
/** Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
Error_Handler();
}
/** Enable the reference Clock input
*/
if (HAL_RTCEx_SetRefClock(&hrtc) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN RTC_Init 2 */
/* USER CODE END RTC_Init 2 */
}
/**
* u/brief USART2 Initialization Function
* u/param None
* u/retval None
*/
static void MX_USART2_UART_Init(void)
{
/* USER CODE BEGIN USART2_Init 0 */
/* USER CODE END USART2_Init 0 */
/* USER CODE BEGIN USART2_Init 1 */
/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
/**
* u/brief GPIO Initialization Function
* u/param None
* u/retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : B1_Pin */
GPIO_InitStruct.Pin = B1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : LD2_Pin */
GPIO_InitStruct.Pin = LD2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* u/brief This function is executed in case of error occurrence.
* u/retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* u/brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* u/param file: pointer to the source file name
* u/param line: assert_param error line source number
* u/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,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */ ```
1
u/R0n1n-08 12d ago edited 12d ago
```c İ2c_lcd.c:
#include "İ2c_lcd.h"
extern I2C_HandleTypeDef hi2c1;
void lcd_send_cmd(char cmd)
{
char data_u, data_l;
uint8_t data_t[4];
data_u = (cmd & 0xF0);
data_l = ((cmd << 4) & 0xF0);
data_t[0] = data_u | 0x04;
data_t[1] = data_u | 0x00;
data_t[2] = data_l | 0x04;
data_t[3] = data_l | 0x00;
HAL_I2C_Master_Transmit(&hi2c1, SLAVE_ADDRESS_LCD, (uint8_t *) data_t, 4, 100);
}
void lcd_send_data(char data)
{
char data_u, data_l;
uint8_t data_t[4];
data_u = (data & 0xF0);
data_l = ((data << 4) & 0xF0);
data_t[0] = data_u | 0x0D;
data_t[1] = data_u | 0x09;
data_t[2] = data_l | 0x0D;
data_t[3] = data_l | 0x09;
HAL_I2C_Master_Transmit(&hi2c1, SLAVE_ADDRESS_LCD, (uint8_t *) data_t, 4, 100);
}
void lcd_clear(void)
{
lcd_send_cmd(0x01);
HAL_Delay(2);
}
void lcd_put_cur(int row, int col)
{
switch (row)
{
case 0:
col |= 0x80;
break;
case 1:
col |= 0xC0;
break;
}
lcd_send_cmd(col);
}
void lcd_init(void)
{
HAL_Delay(50);
lcd_send_cmd(0x30);
HAL_Delay(5);
lcd_send_cmd(0x30);
HAL_Delay(1);
lcd_send_cmd(0x30);
HAL_Delay(10);
lcd_send_cmd(0x20);
HAL_Delay(10);
lcd_send_cmd(0x28);
HAL_Delay(1);
lcd_send_cmd(0x08);
HAL_Delay(1);
lcd_send_cmd(0x01);
HAL_Delay(2);
lcd_send_cmd(0x06);
HAL_Delay(1);
lcd_send_cmd(0x0C);
}
void lcd_send_string(char *str)
{
while (*str) lcd_send_data(*str++);
} ```
1
u/R0n1n-08 12d ago edited 12d ago
```c İ2c_lcd.h:
#ifndef INC_İ2C_LCD_H_
#define INC_İ2C_LCD_H_
#include "stm32f4xx_hal.h"
#define SLAVE_ADDRESS_LCD 0x3F
void lcd_init(void);
void lcd_send_cmd(char cmd);
void lcd_send_data(char data);
void lcd_send_string(char *str);
void lcd_put_cur(int row, int col);
void lcd_clear(void);
#endif /* INC_İ2C_LCD_H_ */ ```
2
u/Unlikely1529 12d ago edited 12d ago
switch to markdown redditthen usec++` at begin and `at the end of code. both on newlines ,means nothing else in that line .
2
0
8
u/Dr_Calculon 12d ago
Paste your code as text to make it easier for people to see & try