At the same time, the required time slot data of the FlexRay bus node is obtained as required. Although the procedures of each electronic control system unit are different, the general functions in the setting and initialization of the FlexRay communication module are the same, which can be divided into: initialization setting, sending data, and receiving data. The initialization program initialization module includes a phase-locked loop (PLL) initialization module, a FlexRay system initialization module, a real-time interrupt module initialization, a FlexRay system clock module initialization, and an input/output module initialization.