Hello, I've been playing around with your driver for a few days and was very happy to get it working quickly.
I see you set up the device for Horizontal Addressing Mode.
27 this->sendCommand(SSD1309_setMemoryAddressingMode);
28 this->sendCommand(0x00);
But when you actually send the data you're using Page mode.
161 void SSD1309::display(unsigned char data)
162 {
163 if(data == nullptr) data = this->buffer;
164 for(uint8_t i = 0; i < this->height/8; i++) {
165 this->sendCommand(0xB0 + i);
166 this->sendCommand(0x00);
167 this->sendCommand(0x10);
168 this->sendData(&data[this->widthi], this->width);
169 }
170 }
Were you ever able to get horizontal addressing mode working where you write the entire buffer to the display in one go?
I really need this so I can implement the display refresh via a DMA transfer to the I2C hardware to free up processing time.

Thanks,

Stuart