北信科大DSP实验报告

北京信息科技大学自动化学院实验报告课程名称DSP实验名称PWM波形产生实验实验仪器计算机，ICETEK-F28335-A实验箱专业自动化班级/学号学生姓名实验日期实验地点成绩指导教师北京信息科技大学自动化学院（DSP）实验报告专业:自动化班级:学号:姓名:实验名称PWM波形产生实验实验地点实验时间实验目的：1.了解TMS320F28335ADSP片内事件管理器模块的脉宽调制电路PWM的特性参数；2.掌握PWM电路的控制方法；3.学会用程序控制产生不同占空比的PWM波形。实验设备：计算机，ICETEK-F28335-A实验箱。实验原理及内容：【原理】1．脉宽调制电路PWM的特性TMS320F28335ADSP片内有两个事件管理器模块，每个事件管理器模块可同时产生多达8路的PWM波形输出。由3个带可编程死区控制的比较单元产生独立的3对PWM（即6个输出），以及由通用定时器比较器产生2个独立的PWM输出。PWM的特性如下：-16位寄存器；-有从0到16μs的可编程死区发生器控制PWM输出对；-最小的死区宽度为1个CPU时钟周期；-对PWM频率的变动可根据需要改变PWM的载波频率；-在每个PWM周期内和以后可根据需要改变PWM脉冲的宽度；-外部可屏蔽的功率驱动保护中断；-脉冲形式发生器电路，用于可编程对称、非对称以及空间矢量PWM波形产生；-自动重装载的比较寄存器和周期寄存器。2．连接示波器连接示波器探头的地线与实验箱左侧的测试点的GND相连，红表笔与测试点PWM1~4相连。【内容】在PWM1~PWM4引脚输出不同频率占空比可变的PWM脉冲。通过示波器可观察到占空比变化的PWM输出波形，其载波频率、占空比与程序中对控制寄存器的设置相关。实验步骤：【实验程序】#include"DSP2833x_Device.h"//DSP2833xHeaderfileIncludeFile#include"DSP2833x_Examples.h"//DSP2833xExamplesIncludeFilevoidInitEPwm(void){}voidInitEPwmGpio(void){InitEPwm1Gpio();InitEPwm2Gpio();InitEPwm3Gpio();#ifDSP28_EPWM4InitEPwm4Gpio();#endif//endifDSP28_EPWM4#ifDSP28_EPWM5InitEPwm5Gpio();#endif//endifDSP28_EPWM5#ifDSP28_EPWM6InitEPwm6Gpio();#endif//endifDSP28_EPWM6}voidInitEPwm1Gpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO0=0;//Enablepull-uponGPIO0(EPWM1A)GpioCtrlRegs.GPAPUD.bit.GPIO1=0;//Enablepull-uponGPIO1(EPWM1B)/*ConfigureePWM-1pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO0=1;//ConfigureGPIO0asEPWM1AGpioCtrlRegs.GPAMUX1.bit.GPIO1=1;//ConfigureGPIO1asEPWM1BEDIS;}voidInitEPwm2Gpio(void){EALLOW; /*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO2=0;//Enablepull-uponGPIO2(EPWM2A)GpioCtrlRegs.GPAPUD.bit.GPIO3=0;//Enablepull-uponGPIO3(EPWM3B)/*ConfigureePWM-2pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO2=1;//ConfigureGPIO2asEPWM2AGpioCtrlRegs.GPAMUX1.bit.GPIO3=1;//ConfigureGPIO3asEPWM2BEDIS;}voidInitEPwm3Gpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO4=0;//Enablepull-uponGPIO4(EPWM3A)GpioCtrlRegs.GPAPUD.bit.GPIO5=0;//Enablepull-uponGPIO5(EPWM3B)/*ConfigureePWM-3pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO4=1;//ConfigureGPIO4asEPWM3AGpioCtrlRegs.GPAMUX1.bit.GPIO5=1;//ConfigureGPIO5asEPWM3B EDIS;}#ifDSP28_EPWM4voidInitEPwm4Gpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO6=0;//Enablepull-uponGPIO6(EPWM4A)GpioCtrlRegs.GPAPUD.bit.GPIO7=0;//Enablepull-uponGPIO7(EPWM4B)/*ConfigureePWM-4pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO6=1;//ConfigureGPIO6asEPWM4AGpioCtrlRegs.GPAMUX1.bit.GPIO7=1;//ConfigureGPIO7asEPWM4BEDIS;}#endif//endifDSP28_EPWM4#ifDSP28_EPWM5voidInitEPwm5Gpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO8=0;//Enablepull-uponGPIO8(EPWM5A)GpioCtrlRegs.GPAPUD.bit.GPIO9=0;//Enablepull-uponGPIO9(EPWM5B)/*ConfigureePWM-5pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO8=1;//ConfigureGPIO8asEPWM5AGpioCtrlRegs.GPAMUX1.bit.GPIO9=1;//ConfigureGPIO9asEPWM5BEDIS;}#endif//endifDSP28_EPWM5#ifDSP28_EPWM6voidInitEPwm6Gpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO10=0;//Enablepull-uponGPIO10(EPWM6A)GpioCtrlRegs.GPAPUD.bit.GPIO11=0;//Enablepull-uponGPIO11(EPWM6B)/*ConfigureePWM-6pinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO10=1;//ConfigureGPIO10asEPWM6AGpioCtrlRegs.GPAMUX1.bit.GPIO11=1;//ConfigureGPIO11asEPWM6BEDIS;}#endif//endifDSP28_EPWM6voidInitEPwmSyncGpio(void){EALLOW;/*ConfigureEPWMSYNCI*//*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO6=0;/*Setqualificationforselectedpinstoasynchonly*/GpioCtrlRegs.GPAQSEL1.bit.GPIO6=0;//SynchtoSYSCLKOUTGPIO6(EPWMSYNCI)/*ConfigureEPwmSyncpinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO6=2;/*ConfigureEPWMSYNC0*//*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPBPUD.bit.GPIO33=0;GpioCtrlRegs.GPBMUX1.bit.GPIO33=2;}voidInitTzGpio(void){EALLOW;/*Enableinternalpull-upfortheselectedpins*/GpioCtrlRegs.GPAPUD.bit.GPIO12=0;//Enablepull-uponGPIO12(TZ1)GpioCtrlRegs.GPAPUD.bit.GPIO13=0;//Enablepull-uponGPIO13(TZ2)GpioCtrlRegs.GPAPUD.bit.GPIO14=0;//Enablepull-uponGPIO14(TZ3)GpioCtrlRegs.GPAPUD.bit.GPIO15=0;//Enablepull-uponGPIO15(TZ4)GpioCtrlRegs.GPAPUD.bit.GPIO16=0;//Enablepull-uponGPIO16(TZ5)GpioCtrlRegs.GPAPUD.bit.GPIO17=0;//Enablepull-uponGPIO17(TZ6)/*Setqualificationforselectedpinstoasynchonly*/GpioCtrlRegs.GPAQSEL1.bit.GPIO12=3;//AsynchinputGPIO12(TZ1)GpioCtrlRegs.GPAQSEL1.bit.GPIO13=3;//AsynchinputGPIO13(TZ2)GpioCtrlRegs.GPAQSEL1.bit.GPIO14=3;//AsynchinputGPIO14(TZ3)GpioCtrlRegs.GPAQSEL1.bit.GPIO15=3;//AsynchinputGPIO15(TZ4)GpioCtrlRegs.GPAQSEL2.bit.GPIO16=3;//AsynchinputGPIO16(TZ5)GpioCtrlRegs.GPAQSEL2.bit.GPIO17=3;//AsynchinputGPIO17(TZ6)/*ConfigureTZpinsusingGPIOregs*/GpioCtrlRegs.GPAMUX1.bit.GPIO12=1;