STM32f4---OLCD display experimental code (01)

In this experiment, we created oled.c and oled.h files. These two files are used to store OLED-related driver functions and file declarations.

The code of oled.c is quite long, so we will not post it here. We will only introduce a few important functions. The first is the OLED_Init function. The structure of this function is relatively simple. It starts with the initialization of the IO port. Here we use the macro definition OLED_MODE to determine the IO port to be set. The rest are some initialization sequences. We can do it according to the information provided by the manufacturer. Finally, it should be pointed out that because OLED has no backlight, after initialization, we clear the video memory, so we can't see anything on the screen, just like there is no power. Don't think that this is an initialization failure. The data module will be written to display it. The code of the OLED_Init function is as follows:

// Initialize SSD1306               

void OLED_Init(void)

{            

   GPIO_InitTypeDef  GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB

|RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOD|RCC_AHB1Periph_GPIOE

|RCC_AHB1Periph_GPIOG, ENABLE); //Enable PORTA~E, PORTG clock

#if OLED_MODE==1 //Use 8080 parallel port mode    

//GPIO initialization settings

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //Normal output mode

   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //Push-pull output

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz

   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉

   GPIO_Init(GPIOA, &GPIO_InitStructure); // Initialization

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7 ;  

GPIO_Init(GPIOB, &GPIO_InitStructure); // Initialization

   GPIO_InitStructure.GPIO_Pin =

  GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_11;  

GPIO_Init(GPIOC, &GPIO_InitStructure); // Initialization  

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;  

GPIO_Init(GPIOD, &GPIO_InitStructure); // Initialization  

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_5;  

GPIO_Init(GPIOE, &GPIO_InitStructure); // Initialization  

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;  

GPIO_Init(GPIOG, &GPIO_InitStructure); // Initialization  

     OLED_WR=1;

OLED_RD=1;  

#else //Use 4-wire SPI serial port mode

       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 ;

       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //Normal output mode

       GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //Push-pull output

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz

       GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉

       GPIO_Init(GPIOB, &GPIO_InitStructure); // Initialization

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;  

  GPIO_Init(GPIOC, &GPIO_InitStructure); // Initialization    

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;  

  GPIO_Init(GPIOD, &GPIO_InitStructure); // Initialization    

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;  

  GPIO_Init(GPIOG, &GPIO_InitStructure); // Initialize OLED_SDIN=1;

  OLED_SCLK=1;

#endif