CCS/CC2650: To interface SSD1306 Oled LCD display with CC2650.

Try to refer to discussions in e2e.ti.com/.../647475

I suggest you to SPI Protocol Analyzer to check if SPI signal is correct .

but SPI is initializing i have checked that one. I am using 3 wire SPI right now and i am getting the voltages across the D1, D0, and Reset pin as in Arduino. right now i am not using the DC pin as it is not required for 3 wire SPI as mentioned in the OLED datasheet

To initialize SPI successfully is one thing and sending correct SPI commands is another. You should make sure you send correct SPI command to OLED to make it work.

Void heartBeatFxn(UArg arg0, UArg arg1) ////////this is my task function
{

_width= WIDTH;
_height= HEIGHT;
gfxFont = NULL;
_vccstate = SSD1306_EXTERNALVCC; //////////////
oled_init(); ///////// for initializing the oled same as display.begin() function in arduino
setRotation(3);
Adafruit_SSD1306_fillScreen(BLACK);
Adafruit_GFX_setTextColor(WHITE,BLACK);
Adafruit_GFX_setTextSize(1);
Adafruit_GFX_setCursor(55, 100);
Adafruit_GFX_print("HELLO");
// }
}

//And following is the function for for initializing the oled SSD1306


void oled_init(void)
{
peri_spi_open();
_vccstate=vccstate;
vccstate = SSD1306_EXTERNALVCC;
int i;

/* RESeT pin of oled
PIN_setOutputValue(pinHandle,Board_OLED_RESET, 1);
Task_sleep(1);
PIN_setOutputValue(pinHandle,Board_OLED_RESET, 0);
Task_sleep(10);
PIN_setOutputValue(pinHandle,Board_OLED_RESET, 1);


writeCommand(SSD1306_DISPLAYOFF); // 0xAE ////////// write command is same as the SSD1306_command of Arduino
writeCommand(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
writeData(0x80); // the suggested ratio 0x80

writeCommand(SSD1306_SETMULTIPLEX); // 0xA8
writeCommand(SSD1306HEIGHT - 1);

writeCommand(SSD1306_SETDISPLAYOFFSET); // 0xD3
writeData(0x0); // no offset
writeCommand(SSD1306_SETSTARTLINE | 0x0); // line #0
writeCommand(SSD1306_CHARGEPUMP); // 0x8D
if (vccstate == SSD1306_EXTERNALVCC)
{ writeData(0x10); }
else
{ writeData(0x14); }
...............................................................................
.......................................................................




SO i am passing the command values as above. What i am missing i am not getting can you help me to find this. Thank you

I don’t have OLED HW to provide physical help so I can only suggest you to use SPI Protocol Analyzer to check if the SPI command to OLED is correct.

Yes, SPI Protocol Analyzer is something like www.totalphase.com/.../

The alternative is to use scope but you have to read/parse the SPI signal manually.

i do not have the scope also. i am at my home so i have just few things like multi-meter .