[MM32 eMiniBoard Review] + Display driver for color OLED screen

jinglixixi

[MM32 eMiniBoard Review] + Display driver for color OLED screen [Copy link]

 

We have introduced the display of dual-color OLED screen before. Can the MM32 eMiniBoard development board drive a color OLED screen?

The answer is yes, and the display effect is shown in Figures 1 and 2.

Figure 1 String and Chinese character display

Figure 2 Icon display

Different from the dual-color screen with I2C interface, the color screen uses SPI interface, so it occupies more I/O ports than the dual-color screen.

So which pins are used?

Here the connection relationship between the OLED screen and the MCU is:

SCK-PB13 CL

MISO--PB14 SDA

MOSI--PB15 RST

SS--PB12 DC

LD1--PA15 CS

LD2-PB3 BLK

I wanted to stick the light of the Arduino interface, but unfortunately, I don’t know when the OLED screens produced now all take GND as the boss!

They made a good Arduino interface, but they can't directly plug in the OLED screen for use. I really don't know why they have such ulterior motives!

There’s no way, the arm can’t twist the thigh!

It is better to use DuPont wire to exchange the line sequence.

The statements that define the high and low levels of the related pins are as follows:

#define OLED_SCLK_Clr() GPIO_ResetBits(GPIOB,GPIO_Pin_13) //CLK

#define OLED_SCLK_Set() GPIO_SetBits(GPIOB,GPIO_Pin_13)

#define OLED_SDIN_Clr() GPIO_ResetBits(GPIOB,GPIO_Pin_14) //DIN

#define OLED_SDIN_Set() GPIO_SetBits(GPIOB,GPIO_Pin_14)

#define OLED_RST_Clr() GPIO_ResetBits(GPIOB,GPIO_Pin_15) //RES

#define OLED_RST_Set() GPIO_SetBits(GPIOB,GPIO_Pin_15)

#define OLED_DC_Clr() GPIO_ResetBits(GPIOB,GPIO_Pin_12) //DC

#define OLED_DC_Set() GPIO_SetBits(GPIOB,GPIO_Pin_12)

#define OLED_CS_Clr() GPIO_ResetBits(GPIOA,GPIO_Pin_15) //CS

#define OLED_CS_Set() GPIO_SetBits(GPIOA,GPIO_Pin_15)

#define OLED_BLK_Clr() GPIO_ResetBits(GPIOB,GPIO_Pin_3) //BLK

#define OLED_BLK_Set() GPIO_SetBits(GPIOB,GPIO_Pin_3)

The function to configure the pin as output is:

void APP_OLED_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
 GPIO_StructInit(&GPIO_InitStructure);
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14| GPIO_Pin_15| GPIO_Pin_12| GPIO_Pin_3;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 GPIO_Init(GPIOB, &GPIO_InitStructure);
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  GPIO_StructInit(&GPIO_InitStructure);
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
 GPIO_Init(GPIOA, &GPIO_InitStructure);
}

The function that completes the string display is:

void LCD_ShowString(u16 x,u16 y,const u8 *p,u16 color)
{
 while(*p!='\0')
 {
 if(x>LCD_W-16){x=0;y+=16;}
 if(y>LCD_H-16){y=x=0;LCD_Clear(RED);}
 LCD_ShowChar(x,y,*p,0,color);
 x+=8;
 p++;
 }
}

The function that realizes icon display is:

void LCD_ShowPicture(u16 x1,u16 y1,u16 x2,u16 y2)
{
  int i;
  LCD_Address_Set(x1,y1,x2,y2);
  for(i=0;i<1600;i++)
  {
 LCD_WR_DATA8(image[i*2+1]);
 LCD_WR_DATA8(image[i*2]);
  }
}

The main program to achieve the display effects of Figures 1 and 2 is:

s32 main(void)
{
       u8 i;
      LED_Init();
      DELAY_Init();
    APP_OLED_Init();
       OLED_BLK_Set();
  Lcd_Init();
      LCD_Clear(BLACK);
  BACK_COLOR=BLACK;
  LCD_ShowChinese(28,0,0,32,YELLOW);
  LCD_ShowChinese(60,0,1,32,YELLOW);
  LCD_ShowChinese(92,0,2,32,YELLOW);
  LCD_ShowChinese(20,40,0,16,YELLOW);
  LCD_ShowChinese(36,40,1,16,YELLOW);
  LCD_ShowChinese(52,40,2,16,YELLOW);
  LCD_ShowChinese(68,40,3,16,YELLOW);
  LCD_ShowChinese(84,40,4,16,YELLOW);
  LCD_ShowChinese(100,40,5,16,YELLOW);
  LCD_ShowChinese(116,40,6,16,YELLOW);
  LCD_ShowString(0,60,"0.96 TFT SPI",YELLOW);
     DELAY_Ms(1000);
       LCD_Clear(BLACK);
  LCD_ShowString(10,0,"LCD_W:",RED);
  LCD_ShowNum(70,0,LCD_W,3,RED);
  LCD_ShowString(10,20,"LCD_H:",RED);
  LCD_ShowNum(70,20,LCD_H,2,RED);
  for(i=0;i<4;i++)
  {
 LCD_ShowPicture(i*40,40,39+i*40,79);
  }
  while(1);
}

w494143467

How is the refresh rate? Is the tearing effect easily visible?

jinglixixi

w494143467 Published on 2020-11-17 09:52 How is the screen refresh speed? Is the tearing effect easy to see?

Fortunately, I don't want to flash a 2.2' TFT screen that has to unfold downwards section by section.

I used PIC16F15324 to make a two-color OLED screen display, and it really displays in pieces!

freebsder

There are so many things to do, and Zhongjing Garden is such a familiar name.

jinglixixi

freebsder posted on 2020-11-17 21:30 There are so many things to play with, and Zhongjingyuan is a very familiar name.

There are so many things to play with, but the money in my pocket limits my purchasing power!

In the future, LED will probably give way to OLED (yeah).

okhxyyo

Smart MM32 eMiniBoard Development Board Review

Summary post: https://en.eeworld.com/bbs/thread-1146791-1-1.html

zxopenljx

Thanks for sharing

jinglixixi

zxopenljx posted on 2021-5-21 10:10 Thank you for sharing

Thanks for your support!