having trouble using I2C oled display

[Liin]

Hello,

i'm trying to program an I2C OLED display 128x64 SSD1306 on PSOC5 but nothing appear on the screen. I'm using 4,7k pull-up resistors for SCL and SDA pins.

Can someone tell if there is something i'm doing wrong please ?

Thank you for your help in advance !

[MotooTanaka]

Hi,

You needed to add charge pump setting 0x8D, 0x14

So I modified your display_init() as follows

// call before first use of other functions
void display_init( uint8 i2caddr ){
    
    _i2caddr = i2caddr;
    gfx_init( DISPLAYWIDTH, DISPLAYHEIGHT );
    
    uint8 cmdbuf[] = {
        0x00,
        SSD1306_DISPLAYOFF,
        SSD1306_SETDISPLAYCLOCKDIV,
        0x80,
        SSD1306_SETMULTIPLEX,
        0x3f,
        SSD1306_SETDISPLAYOFFSET,
        0x00,
        SSD1306_SETSTARTLINE | 0x0,
        SSD1306_CHARGEPUMP,
        0x14,
        SSD1306_MEMORYMODE,
        0x00,
        SSD1306_SEGREMAP | 0x1,
        SSD1306_COMSCANDEC,
        SSD1306_SETCOMPINS,
        0x12,
        SSD1306_SETCONTRAST,
        0xcf,
        SSD1306_SETPRECHARGE,
        0xf1,
        SSD1306_SETVCOMDETECT,
        0x40,
        0x8D, 0x14, // Set Charge Pump Setting (0x14: Enable Charge Pump)
        SSD1306_DISPLAYALLON_RESUME,
        SSD1306_NORMALDISPLAY,
        SSD1306_DISPLAYON
    };
    
    display_write_buf( cmdbuf, sizeof(cmdbuf) ); 
}

moto

[MotooTanaka · Accepted solution]

Hi,

Coincidently I wrote a sample program of SSD1306 for PSoC 4 last week.

Today, I ported it for PSoC 5LP (CY8CKIT-059).
https://community.infineon.com/t5/Code-Examples/SSD1306-I2C-OLED-128x64-PSoC-5LP-CY8CKIT-059/m-p/390...

moto

[Liin]

Hello, I tried adding this line and it works perfectly fine now ! Thank you for your answer.