STM32如何控制步进电机28BYJ-48？

步进电机驱动最简化的逻辑：
//四相八拍：A->AB->B ->BC ->C ->CD ->D ->DAunsigned char Motor_StepDat[8] = {0x08,0x0C,0x04,0x06,0x02,0x03,0x01,0x09};/* A   1000   0x08AB  1100   0x0CB   0100   0x04BC  0110   0x06C   0010   0x02CD  0011   0x03D   0001   0x01DA  1001   0x09*/void MotorH_Step1(unsigned char Dir_Flag){    if(Dir_Flag)    {        Motor1_StepNum++;    }    else    {        Motor1_StepNum--;    }    GPIOB->ODR |= ((unsigned short)Motor_StepDat[Motor1_StepNum]<<12);    GPIOB->ODR &= (((unsigned short)Motor_StepDat[Motor1_StepNum]<<12) | 0x0FFF);     //驱动电机的引脚是PB12-PB15，将这四位的值设置为Motor_StepDat[Motor1_StepNum]}