[NUCLEO-L452RE Review] +OLED screen display driver

jinglixixi

[NUCLEO-L452RE Review] +OLED screen display driver [Copy link]

The NUCLEO-L452RE development board has relatively few peripherals. In order to facilitate human interaction, the first thing to consider is to equip it with a display screen to facilitate information observation.

In order to occupy less system resources, a two-color OLED screen with an I2C interface is used here . Considering that the NUCLEO-L452RE development board is equipped with an Arduino interface, the OLED screen is placed on the Arduino interface for use, so that the problem can be solved without connecting wires.

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

SCL---PA5

SDA---PA6

The statement that controls the high and low levels of the related pins is defined as:

#define OLED_SCLK_Set() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_SET)

#define OLED_SCLK_Clr() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_RESET)

#define OLED_SDIN_Set() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_6,GPIO_PIN_SET)

#define OLED_SDIN_Clr() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_6,GPIO_PIN_RESET)

The function to implement pin output function configuration is:

void GPIO_OLED_INIT(void)
{
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Mode= GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Pin = GPIO_PIN_5;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 
GPIO_InitStruct.Pin = GPIO_PIN_6;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

The auxiliary display function is:

void IIC_Start()
{
OLED_SCLK_Set();
OLED_SDIN_Set();
OLED_SDIN_Clr();
OLED_SCLK_Clr();
}

void IIC_Stop()
{
OLED_SCLK_Set();
OLED_SDIN_Clr();
OLED_SDIN_Set();
}

void IIC_Wait_Ack()
{
OLED_SCLK_Set();
OLED_SCLK_Clr();
}

The string display functions involved are:

void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 Char_Size)
{
  unsigned char j=0;
  while (chr[j]!='\0')
  {   
            OLED_ShowChar(x,y,chr[j],Char_Size);
    x+=8;
    if(x>120){x=0;y+=2;}
    j++;
  }

}

The main program to achieve the display effect shown in the figure below is:

int main(void)
{
HAL_Init();
SystemClock_Config();
GPIO_OLED_INIT();
OLED_Init();
OLED_Clear();
OLED_ShowString(8,2,"STM32L452",16);
OLED_ShowString(8,4,"OLED TEST",16);
OLED_ShowCHinese(80,2,9);
OLED_ShowCHinese(96,2,10);
OLED_ShowCHinese(112,2,11);
while (1);
}

OLED screen display effect

With the display function of the OLED screen, it will be more convenient to realize an electronic clock with RTC later.

okhxyyo

ST NUCLEO-L452RE review

Summary post: https://en.eeworld.com/bbs/thread-1151850-1-1.html、

zhd

Did you copy it?

jinglixixi

zhd posted on 2020-12-20 20:52 Did you copy it?

What does it mean?

zhd

Wrong model?

jinglixixi

zhd posted on 2020-12-21 15:08 The model is wrong?

Haha, the two boards arrived at the same time, so they can be used together to run programs.

dql2016

This LCD is more fun if it is bigger

jinglixixi

dql2016 posted on 2020-12-22 13:27 This LCD will be more fun if it is bigger

I'll get a 2.2-inch display next time.