Lights of dead

LPC1768 Lights of dead LPC11U24 Lights of dead FRMD-KL25Z Lights of dead

LPC1768, LPC11U24 and FRDM-KL25Z showing their distinctive lights of dead pattern

When your development board shows the “lights of dead” it means the board ran into a runtime error. Runtime errors occur when code is correct but tries to do something that is invalid, or when malfunctioning hardware cannot be accessed.

A typical example is assigning the wrong function to a pin. For example, switching the SDA and SCK pins when accessing I2C or trying to use PwmOut on a pin that does not support pulse-width modulation.