When i turn on the display everything is ok but only at the right bottom corner is black box. dont know why but i solved it by swithing lines 102-103

this->send(PCD8544_CMD, 0x08); // display blank this->send(PCD8544_CMD, 0x0c); // normal mode (0x0d = inverse mode)

to this

this->send(PCD8544_CMD, 0x0c); // normal mode (0x0d = inverse mode) this->send(PCD8544_CMD, 0x08); // display blank

Comment deleted

ups no i didnt solved it. and now i cant delete this issue. but admin can so pls do it :) sry

btw i have display from nokia 3410 which is 96*65 so i have 1px line a the bottom which is also black