[ST NUCLEO-U5A5ZJ-Q development board review] In-depth experience of I2C driven OLED screen

lugl4313820

[ST NUCLEO-U5A5ZJ-Q development board review] In-depth experience of I2C driven OLED screen [Copy link]

According to the official data sheet, the I2C can operate at three communication speeds: 100K, 400K, and 1M.

This time, three different speeds are used to drive the OLED screen, and the FPS of the OLED is used to test the effect:

【Configuration】

1. IO selects D15 (PB8) - SLC and D14 (PB9) - SDA on the development board as pin output.

2. Create an STM32CubeIDE project based on the development board and configure the pins to PB8 and PB9:

4. First, configure the speed to 100K, 400K, and 1M:

5. Transplant OLED driver, skip (please check the project attachment yourself)

6. Function for measuring FPS:

void ssd1306_TestFPS() {
    ssd1306_Fill(White);
   
    uint32_t start = HAL_GetTick();
    uint32_t end = start;
    int fps = 0;
    char message[] = "ABCDEFGHIJK";
   
    ssd1306_SetCursor(2,0);
    ssd1306_WriteString("Testing...", Font_11x18, Black);
    ssd1306_SetCursor(2, 18*2);
    ssd1306_WriteString("0123456789A", Font_11x18, Black);
   
    do {
        ssd1306_SetCursor(2, 18);
        ssd1306_WriteString(message, Font_11x18, Black);
        ssd1306_UpdateScreen();
       
        char ch = message[0];
        memmove(message, message+1, sizeof(message)-2);
        message[sizeof(message)-2] = ch;

        fps++;
        end = HAL_GetTick();
    } while((end - start) < 5000);
   
    HAL_Delay(5000);

    char buff[64];
    fps = (float)fps / ((end - start) / 1000.0);
    snprintf(buff, sizeof(buff), "~%d FPS", fps);
   
    ssd1306_Fill(White);
    ssd1306_SetCursor(2, 2);
    ssd1306_WriteString(buff, Font_11x18, Black);
    ssd1306_UpdateScreen();
}

6. The test results are as follows:

100K——9FPS

400K——29FPS

1M—— 49FPS

【Summarize】

By comparing three different speeds and configuring different speeds, the effect can be greatly improved at the same main frequency.

2609

Can you send me the OLED driver attachment? There are several errors every time.

lugl4313820

My Downloads_Personal Center - - EEWORLD

I have uploaded the source code here.