#include "u8g_arm.h"  
 void u8g_Delay(uint16_t val)  
 {  
      HAL_Delay(val);  
 }  
 void u8g_MicroDelay(void)  
 {  
      HAL_Delay(1);  
 }  
 void u8g_10MicroDelay(void)  
 {  
      HAL_Delay(1);  
 }  
 uint8_t u8g_com_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)  
 {  
  switch(msg)  
  {  
   case U8G_COM_MSG_STOP:  
    break;  
   case U8G_COM_MSG_INIT:  
    u8g_MicroDelay();  
    break;  
   case U8G_COM_MSG_ADDRESS:           /* define cmd (arg_val = 0) or data mode (arg_val = 1) */  
    u8g_10MicroDelay();  
    HAL_GPIO_WritePin(PORT, DC, arg_val);  
    u8g_10MicroDelay();  
    break;  
   case U8G_COM_MSG_CHIP_SELECT:  
    if ( arg_val == 0 )  
    {  
         HAL_Delay(1);  
         HAL_GPIO_WritePin(PORT, CS, GPIO_PIN_SET);  
    }  
    else  
      HAL_GPIO_WritePin(PORT, CS, GPIO_PIN_RESET);  
    u8g_MicroDelay();  
    break;  
   case U8G_COM_MSG_RESET:  
    break;  
   case U8G_COM_MSG_WRITE_BYTE:  
     HAL_SPI_Transmit(&SPI_HANDLER, &arg_val, 1, 10000);  
     while(HAL_SPI_GetState(&SPI_HANDLER) != HAL_SPI_STATE_READY);  
     u8g_MicroDelay();  
     break;  
   case U8G_COM_MSG_WRITE_SEQ:  
   case U8G_COM_MSG_WRITE_SEQ_P:  
    {  
         HAL_SPI_Transmit(&SPI_HANDLER, (uint8_t *)arg_ptr, arg_val, 10000);  
         while(HAL_SPI_GetState(&SPI_HANDLER) != HAL_SPI_STATE_READY);  
         u8g_MicroDelay();  
         arg_val = 0;  
    }  
    break;  
  }  
  return 1;  
 }  

 #ifndef _U8G_ARM_H  
 #define _U8G_ARM_H  
 #include "u8g.h"  
 #include "stm32f1xx_hal.h"  
 #define SPI_HANDLER hspi2 // use your SPI hadler  
 extern SPI_HandleTypeDef SPI_HANDLER;  
 #define DC GPIO_PIN_11  
 #define CS GPIO_PIN_12  
 #define PORT GPIOB  
 uint8_t u8g_com_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);  
 #endif  

 #include "stm32f1xx_hal.h"  
   
 /* USER CODE BEGIN Includes */  
 #include "u8g.h"  
 #include "u8g_arm.h"  
 /* USER CODE END Includes */  
   
 /* Private variables ---------------------------------------------------------*/  
 SPI_HandleTypeDef hspi2;  
   
 TIM_HandleTypeDef htim1;  
   
 /* USER CODE BEGIN PV */  
 u8g_t u8g;  
 /* Private variables ---------------------------------------------------------*/  
   
 /* USER CODE END PV */  
   
 /* Private function prototypes -----------------------------------------------*/  
 void SystemClock_Config(void);  
 static void MX_GPIO_Init(void);  
 static void MX_SPI2_Init(void);  
   
   
 /* USER CODE BEGIN PFP */  
 /* Private function prototypes -----------------------------------------------*/  
   
 /* USER CODE END PFP */  
   
 /* USER CODE BEGIN 0 */  
   
 /* USER CODE END 0 */  
   
 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();  
   
  /* Configure the system clock */  
  SystemClock_Config();  
   
  /* Initialize all configured peripherals */  
  MX_GPIO_Init();  
  MX_SPI2_Init();  
   
   
  /* USER CODE BEGIN 2 */  
  u8g_InitComFn(&u8g, &u8g_dev_ssd1306_128x64_hw_spi, u8g_com_hw_spi_fn); //이부분은 자신의 디스플레이에 맞춰야함 
  HAL_Delay(100);  
  /* USER CODE END 2 */  
   
  /* Infinite loop */  
  /* USER CODE BEGIN WHILE */  
  while (1)  
  {  
  /* USER CODE END WHILE */  
   
  /* USER CODE BEGIN 3 */  
       u8g_FirstPage(&u8g);  
       do  
       {  
            u8g.font = u8g_font_profont22;  
            u8g_DrawStr(&u8g, 20, 55, "Hello");  
       } while ( u8g_NextPage(&u8g) );  
    HAL_Delay(100);  
  }  
  /* USER CODE END 3 */  
   
 }