编写一段代码，基于TMS28335的pwm波控制电机转速

好的，以下是基于TMS28335的PWM控制电机转速的代码示例：

#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"

#define PWM_FREQUENCY 20000  // PWM频率为20 kHz
#define F_PERIPH 150000000   // TMS28335内部外设时钟为150 MHz
#define PWM_PERIOD (F_PERIPH/PWM_FREQUENCY) //PWM周期为7500

void InitPWM(void);

void main(void)
{
    InitSysCtrl(); // 初始化系统控制寄存器
    InitPWM();     // 初始化PWM

    while(1)
    {
        //在这里实现电机转速的控制
    }
}

void InitPWM(void)
{
    //-------------------- Init GPIO B ------------------------------------//
    // 配置GPIO为PWM时钟输出
    EALLOW;
    GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO16 = 1;
    GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;
    GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;
    EDIS;

    //-------------------- Init PWM ----------------------------------------//
    // 384分频器，得出M周期的2分之一，用于计算使本机器人运动所需要的速度 
    EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
    EPwm1Regs.TBPRD = PWM_PERIOD; // 设置PWM周期为7500
    EPwm1Regs.TBPHS.bit.TBPHS = 0;
    EPwm1Regs.TBCTR = 0;

    // 设置占空比
    EPwm1Regs.CMPA.bit.CMPA = PWM_PERIOD/2; // 初始化占空比为50％
    EPwm1Regs.CMPB.bit.CMPB = PWM_PERIOD/2; 

    // 配置TBCTR计数模式
    EPwm1Regs.TBCTR = 0;
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;
    EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;

    // 配置CMPA输出模式
    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
    EPwm1Regs.CMPCTL.bit.PRDAMODE = CC_CTR_ZERO;
    EPwm1Regs.AQCTLA.bit.ZRO = AQ_CLEAR;
    EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;

    // 配置CMPB输出模式
    EPwm1Regs.CMPCTL.bit.SHDBMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
    EPwm1Regs.CMPCTL.bit.PRDBMODE = CC_CTR_ZERO;
    EPwm1Regs.AQCTLB.bit.ZRO = AQ_SET;
    EPwm1Regs.AQCTLB.bit.CBU = AQ_CLEAR;

    // 启动PWM模块
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
}

请注意，此代码只是示例。电机转速的控制逻辑需要根据实际应用进行修改。