Siemens M55 Display doesn't work properly

[facc357]

This is because the SPI clock (4 MHz default at Arduino Uno) is too fast. I have to set SPI clock speed to 1 MHz to get it working on M55 display. My solution: void setup() { SPI.setClockDivider(SPI_CLOCK_DIV16); lcd.init(); } This works for Arduino IDE 1.0.5. Maybe there is a better solution for new Arduino IDE versions.