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`/* USER CODE BEGIN Header /
/*

• @file : main.c
• @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.

/
/ USER CODE END Header /
/ Includes ------------------------------------------------------------------/
#include "main.h"
#include "tm1637.h"
//#include "core_cm4.h"
/ Private includes ----------------------------------------------------------/
/ USER CODE BEGIN Includes /
tm1637_t disp;
/ USER CODE END Includes */

/* Private typedef -----------------------------------------------------------/
/ USER CODE BEGIN PTD /
const uint8_t seg_LOAD[4] = {0x38, 0x5c, 0x77, 0x5e}; // display LOAD
/ 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 ---------------------------------------------------------*/
TIM_HandleTypeDef htim4;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM4_Init(void);
/ USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------/
/ USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**

• @brief The application entry point.
• @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_TIM4_Init();
/ USER CODE BEGIN 2 */

tm1637_init(&disp, GPIOB, GPIO_PIN_12, GPIOA, GPIO_PIN_7);
// tm1637Init();
/* USER CODE END 2 */
//tm1637_init(&disp, CLK1_GPIO_Port, CLK1_Pin, DIO1_GPIO_Port, DIO1_Pin);

//tm1637_brightness(&disp, 7);

/* Infinite loop /
/ USER CODE BEGIN WHILE /
while (1)
{
/ USER CODE END WHILE */

/* USER CODE BEGIN 3 */

   // HAL_Delay(2000);
   // tm1637_write_int(&disp, 56, 0);
//    HAL_Delay(2000);

  tm1637_write_segment(&disp, seg_LOAD, 4, 0);
      HAL_Delay(1000);
      tm1637_write_float(&disp, -1.23, 2, 0);
      HAL_Delay(1000);
      tm1637_write_int(&disp, 56, 0);

}
/* USER CODE END 3 */
}

/**

• @brief System Clock Configuration
• @RetVal None
  */
  void SystemClock_Config(void)
  {
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

/** Initializes the RCC Oscillators according to the specified parameters

• in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  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_PLLCLK;
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_2) != HAL_OK)
{
Error_Handler();
}
}

/**

• @brief TIM4 Initialization Function
• @param None
• @RetVal None
  */
  static void MX_TIM4_Init(void)
  {

/* USER CODE BEGIN TIM4_Init 0 */

/* USER CODE END TIM4_Init 0 */

TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};

/* USER CODE BEGIN TIM4_Init 1 */

/* USER CODE END TIM4_Init 1 /
htim4.Instance = TIM4;
htim4.Init.Prescaler = 72-1;
htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
htim4.Init.Period = 1;
htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim4) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim4, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim4, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
/ USER CODE BEGIN TIM4_Init 2 */

/* USER CODE END TIM4_Init 2 */

}

/**

• @brief GPIO Initialization Function
• @param None
• @RetVal None
  /
  static void MX_GPIO_Init(void)
  {
  / USER CODE BEGIN MX_GPIO_Init_1 /
  / USER CODE END MX_GPIO_Init_1 */

/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();

/* USER CODE BEGIN MX_GPIO_Init_2 /
/ USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**

• @brief This function is executed in case of error occurrence.
• @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
/**

• @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,
  ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) /
  / USER CODE END 6 /
  }
  #endif / USE_FULL_ASSERT */
  `

Hi,

Thanks for the library, it works great !
However, I had a little problem with the function "tm1637_delay_us()". Firstly, the instructions "__nop();" were not recognized by the compiler. I've tried with asm("nop"); instead. I could flash the program but unfortunately it didn't worked.
I've tried to use a hardware timer to create the delay and it worked !

If someone, is facing the same issue, here is the way to achieve it :

• Configure the hardware timer in CubeMX. You must change the prescaler in order to create a 1 MHz timer (to achieve a us clock period). In my case, I've used a F401RE Nucleo Board with a 84 MHz clock so I set the prescaler value to 84-1.
• In the CubeMX project manager , tick "Generate peripheral initialization as a pair of '.c/.h' files per peripheral" so that you can use timer stuff in "tm1637.c" file.
• In "tm1637.c", add :

#include "tim.h"

and change :

void tm1637_delay_us(uint8_t delay)
{
     while (delay > 0)
     {
        delay--;
        __nop();__nop();__nop();__nop();
     }
}

by

void tm1637_delay_us(uint8_t delay)
{
    HAL_TIM_Base_Start(&htim4);
    __HAL_TIM_SET_COUNTER(&htim4,0);  // set the counter value a 0
    while (__HAL_TIM_GET_COUNTER(&htim4) < delay);  // wait for the counter to reach the us input in the parameter
    HAL_TIM_Base_Stop(&htim4);
}

Adapt the previous code with the timer you are using (in my case, I was using TIMER 4)