SSD1306 ASCII - Rotate 180

Other Hardware Displays
1

(I'm using a 0.96" (or 1.3") I2C OLED.)

I absolutely love this library. It is small and does everything I want. However, during the PCB design process and enclosure layout, I realized that the pins (that come presoldered) will possibly touch the PCB if the OLED is "right-side up."

However, if I rotate the OLED so that it's "upside down," then the pins won't touch and I'll have no clearance issues.

I'm pretty sure that the library doesn't natively support this; I'm also hoping I don't need the 1k buffer to be able to do so.

Is it possible? Am I barking up a bad tree?

Thanks in advance,
Kyle

2

Look at command(0xA1) and command(0xDA) in the data sheet.
You should be able to add these to your setup()

Untested.

David.

3

David,

Thanks for the direction! I wouldn't have thought to look there.

After Googling a bit more, I found a guy who said to do this in the Adafruit library (notice the comment slashes):

//ssd1306_command(SSD1306_SEGREMAP | 0x1);
ssd1306_command(SSD1306_SEGREMAP);

//ssd1306_command(SSD1306_COMSCANDEC);
ssd1306_command(SSD1306_COMSCANINC);

I'm going to try adding a new DevType/MEM_TYPE in the ASCII library that uses these init commands; then I'll report back and see how it went.

4

U8g2 includes a text only/ASCII library called u8x8. It has similar advantages compared with other ASCII libs for graphics OLEDs: Small size and fast. U8x8 support 180 degree rotation.

Oliver

5

olikraus:
U8g2 includes a text only/ASCII library called u8x8. It has similar advantages compared with other ASCII libs for graphics OLEDs: Small size and fast. U8x8 support 180 degree rotation.

Oliver

Hey Oliver,

Thanks for the input. I'm already knee-deep in the other library, and it's been serving me VERY well so far. If I ever have to switch because of something, I'll head over to U8x8.

6

OK, so here's what I found that worked in case anyone else stumbles across this. I created a new DevType with the following setup:

static const uint8_t MEM_TYPE SH1106_128x64Invinit[] = {
	SSD1306_DISPLAYOFF,
	SSD1306_SETSTARTPAGE | 0X0,            // set page address
	SSD1306_SETCONTRAST, 0x80,             // 128
	SSD1306_SEGREMAP,                // set segment remap
	SSD1306_NORMALDISPLAY,                 // normal / reverse
	SSD1306_SETMULTIPLEX, 0x3F,            // ratio 64
	SH1106_SET_PUMP_MODE, SH1106_PUMP_ON,  // set charge pump enable
	SH1106_SET_PUMP_VOLTAGE | 0X2,         // 8.0 volts
	SSD1306_COMSCANINC,                    // Com scan direction
	SSD1306_SETDISPLAYOFFSET, 0X00,        // set display offset
	SSD1306_SETDISPLAYCLOCKDIV, 0X80,      // set osc division
	SSD1306_SETPRECHARGE, 0X1F,            // set pre-charge period
	SSD1306_SETCOMPINS, 0X12,              // set COM pins
	SSD1306_SETVCOMDETECT,  0x40,          // set vcomh
	SSD1306_DISPLAYON
};
/** Initialize a 128x64 oled SH1106 display. */
static const DevType MEM_TYPE SH1106_128x64Inv = {
	SH1106_128x64Invinit,
	sizeof(SH1106_128x64Invinit),
	128,
	64,
	2    // SH1106 is a 132x64 controller.  Use middle 128 columns.
};

I modified the SSD1306_COMSCANINC vs SSD1306_COMSCANDEC and SSD1306_SEGREMAP vs. SSD1306_SEGREMAP | 0X1. That's it!

Thanks again!