基于stm32的库函数的小车系统程序，包括直流电机L298驱动，38KHz调制红外循迹，车轮码盘脉冲计数，液晶显示等模块。-Stm32 the library function based on the vehicle system programs, including the L298 DC motor driver, 38KHz modulated infrared tracking, wheel encoder pulse counting, such as liquid crystal