Stm32f030,ST7920,3 Wire Software SPI, Does not work!

Hi everybody I tried to use ST7920 and stm32f030 via 3 wire software spi. my code is:

//----------------------------------------------------------
uint8_t u8g2_gpio_and_delay_stm32(U8X8_UNUSED u8x8_t *u8x8, U8X8_UNUSED uint8_t msg, U8X8_UNUSED uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
{
    switch(msg){
        //Initialize SPI peripheral
        case U8X8_MSG_GPIO_AND_DELAY_INIT:
            /* HAL initialization contains all what we need so we can skip this part. */
            HAL_Delay(1);
        break;

        //Function which implements a delay, arg_int contains the amount of ms
        case U8X8_MSG_DELAY_MILLI:
            HAL_Delay(arg_int);

        break;
        //Function which delays 10us
        case U8X8_MSG_DELAY_10MICRO:
            for (uint16_t n = 0; n < 320; n++)
            {
                __NOP();
            }
            //HAL_Delay(1);
        break;
        //Function which delays 100ns
        case U8X8_MSG_DELAY_100NANO:
            __NOP();
            //HAL_Delay(1);

        break;
        //Function to define the logic level of the clockline
        //case U8X8_MSG_GPIO_D0:
        case U8X8_MSG_GPIO_SPI_CLOCK:
            if (arg_int) 
                HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_SET);
            else 
                HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_RESET);

        break;
        //Function to define the logic level of the data line to the display
        case U8X8_MSG_GPIO_SPI_DATA:
        //case U8X8_MSG_GPIO_D1:
            if (arg_int) 
                HAL_GPIO_WritePin(MOSI_GPIO_Port, MOSI_Pin, GPIO_PIN_SET);
            else 
                HAL_GPIO_WritePin(MOSI_GPIO_Port, MOSI_Pin, GPIO_PIN_RESET);

        break;
        // Function to define the logic level of the CS line
        case U8X8_MSG_GPIO_CS:
            if (arg_int) 
                HAL_GPIO_WritePin(LCD_CS_GPIO_Port, LCD_CS_Pin, GPIO_PIN_SET);
            else 
                HAL_GPIO_WritePin(LCD_CS_GPIO_Port, LCD_CS_Pin, GPIO_PIN_RESET);

        break;
        //Function to define the logic level of the Data/ Command line
        case U8X8_MSG_GPIO_DC:
//          if (arg_int) HAL_GPIO_WritePin(CD_LCD_PORT, CD_LCD_PIN, GPIO_PIN_SET);
//          else HAL_GPIO_WritePin(CD_LCD_PORT, CD_LCD_PIN, GPIO_PIN_RESET);

        break;
        //Function to define the logic level of the GPIO_PIN_RESET line
        case U8X8_MSG_GPIO_RESET:
//          if (arg_int) 
//              HAL_GPIO_WritePin(LCD_RESET_GPIO_Port, LCD_RESET_Pin, GPIO_PIN_SET);
//          else 
//              HAL_GPIO_WritePin(LCD_RESET_GPIO_Port, LCD_RESET_Pin, GPIO_PIN_RESET);

        break;
        default:
            return 0; //A message was received which is not implemented, return 0 to indicate an error
    }

    return 1; // command processed successfully.
}
/* 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 */
    u8g2_t u8g2;
  /* 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();
  /* USER CODE BEGIN 2 */

  u8g2_Setup_st7920_p_128x64_1(&u8g2, U8G2_R0, u8x8_byte_3wire_sw_spi, u8g2_gpio_and_delay_stm32);
    //u8g2_Setup_st7920_s_128x64_f(&u8g2, U8G2_R0, u8x8_byte_3wire_sw_spi, u8g2_gpio_and_delay_stm32);
  u8g2_InitDisplay(&u8g2); // send init sequence to the display, display is in sleep mode after this,
  u8g2_SetPowerSave(&u8g2, 0); // wake up display

//  HAL_GPIO_WritePin(LCD_RESET_GPIO_Port, LCD_RESET_Pin, GPIO_PIN_RESET);
//  HAL_Delay(100);
//  HAL_GPIO_WritePin(LCD_RESET_GPIO_Port, LCD_RESET_Pin, GPIO_PIN_SET);
//  HAL_Delay(200);

  HAL_Delay(1000);
  u8g2_DrawLine(&u8g2, 50,50, 100, 100);
  u8g2_SendBuffer(&u8g2);
  HAL_Delay(1000);
    ST7920_SendString(1,0,"U8G2");
  /* USER CODE END 2 */

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

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

and

#define SCK_Pin             GPIO_PIN_5    //E
#define SCK_GPIO_Port       GPIOA
#define LCD_CS_Pin      GPIO_PIN_6   //RS
#define LCD_CS_GPIO_Port    GPIOA
#define MOSI_Pin            GPIO_PIN_7  //R_W
#define MOSI_GPIO_Port  GPIOA

and also connected the psb to gnd. but that did not work and showed nothing! how can i coupe this issue thanks

olikraus / u8g2

Stm32f030,ST7920,3 Wire Software SPI, Does not work! #2366