DSP28335EPWM配置

EPWM配置GPIO配置GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;关闭所有epwm基准时钟EALLOW;SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;EDIS;1 配置TBl 时间基准状态寄存器EPwm4Regs.TBSTS.all=0l 相位寄存当检测到同步输入脉冲时，相位寄存器的值装载到计数寄存器EPwm4Regs.TBPHS.half.TBPHS=0;l 时间基准计数器清零，即清除计数器，TBCTR相当于计数器EPwm4Regs.TBCTR=0;l 周期寄存器，设置PWM周期EPwm4Regs.TBPRD=SP;l 时间基准控制寄存器1.计时器计数模式EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; 2.相位装载模式EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; 3.周期寄存器的映射寄存器加载条件EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;4.EPWMxSYNCO信号源选择EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE;5.时钟分频：TBCLK=SYSCLKOUT/(2*HSPCLKDIV)(2CLKDIV)EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;2 配置CCl 比较控制寄存器1.CMPA/B影子寄存器的加载模式EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;2.在选定映射模式下，选择加载方式EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;l 比较寄存器A/B，改变可改变比较点，调整输出占空比EPwm4Regs.CMPA.half.CMPA =400;EPwm4Regs.CMPB=0;3 配置AQl 输出比较方式，控制发生比较事件前后EPWM的电平例：EPwm4Regs.AQCTLA.all=0x60; EPwm4Regs.AQCTLA.PRD/CAU/CBU/CAD/CBD/ZRO=AQ_CLEAR/SET;l 软件强制控制EPwm4Regs.AQSFRC.all=0;EPwm4Regs.AQCSFRC.all=0;4 死区DBl 死区控制EPwm4Regs.DBCTL.all=0xb;l 上升/下降沿延迟DBRED/DBFED，9-0共10位EPwm4Regs.DBRED=0;/上升沿延时=0EPwm4Regs.DBFED=0;/下降沿延时=05 故障TZEALLOW; EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_HI;/00高阻 EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_HI; EPwm1Regs.TZFRC.bit.OST = 1;/强制生成一次性错误事件并设定TZFLGOST位 EDIS;6 斩波7 事件触发ETl 事件触发选择，选择中断、ADC在什么时候触发；SOCA、SOCB脉冲生成EPwm4Regs.ETSEL.all=0; 打开所有epwm基准时钟EALLOW;SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;EDIS;EPWM中断设置l 中断入口地址EALLOW; / This is needed to write to EALLOW protected registers PieVectTable.EPWM1_INT = &epwm1_timer_isr;EDIS;l 初始化EPWM1、关闭所有epwm基准时钟（接下来要配置参数了） EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; / Stop all the TB clocks EDIS;2、选择EPWMxSYNCO信号源 00 EPWMxSYNCEPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;3、当EPWMxSYNCI输入信号产生，将TBPHS加到TBCTREPwm1Regs.TBCTL.bit.PHSEN = TB_ENABLE;4、相位寄存器EPwm1Regs.TBPHS.half.TBPHS = 100;5、周期、计数模式 EPwm1Regs.TBPRD = PWM1_TIMER_TBPRD; EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; / Count up5、中断触发配置 EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; / Select INT on Zero event EPwm1Regs.ETSEL.bit.INTEN = PWM1_INT_ENABLE; / Enable INT EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; / Generate INT on 1st event6、开epwm基准时钟 EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS;l 开CPU中断IER |= M_INT3;PieCtrlRegs.PIEIER3.bit.INTx1 = PWM1_INT_ENABLE;EINT; / Enable Global interrupt INTMERTM;中断服务函数interrupt void epwm1_timer_isr(void) EPwm1TimerIntCount+; EPwm1Regs.ETCLR.bit.INT = 1; PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;PWM初始化例子/PWM初始化/这些定义的数据都在IncludeDSP2833x_EPwm_defines.h里void Init_PWM1() EPwm1Regs.TBPRD = PrdCnst;/设置TB周期 EPwm1Regs.TBPHS.half.TBPHS = 0x0;/同步事件发生，此值加载到CTR EPwm1Regs.TBCTR = 0x0000; EPwm1Regs.CMPA.half.CMPA = Cnst;/CMPA初始化 EPwm1Regs.CMPB = Cnst; /控制信号选择 EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;/增减模式 EPwm1Regs.TBCTL.bit.PHSEN = 1;/同步使能 本程序中通过SWFSYNC软件强制同步； /时钟同步输入/出信号仅由EPWM1引脚产生 EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;/0 TBPRD当TBCTR=0时，其从映射寄存加载 EPwm1Regs.TBCTL.bit.SYNCOSEL = 0x0;/EPWMxSYNC /TBCLK=SYSCLK/(2*HSPCLKDIV * 2CLKDIV) EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0x0;/时钟设置TBCLK EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.TBCTL.bit.PHSDIR = 1;/同步后计数器递增计数 /CC设置，产生计数器匹配信号，比较操作使能shadow模式 EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;/0 EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; /当CTR=0/PRD时，加载shadow的值并生效 /这个的作用是在CMPA/B发生变化时加载新的值的时间点 EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;/0x0 EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; /AQ设置，EPWM_A B产生互补的信号 EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; /CTR=A且上升的时候PWM输出1EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; /CTR=A且下降的时候PWM输出0EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; /DB设置，A上升沿延时不取反 B下降沿延时取反 EPwm1Regs.DBCTL.bit.IN_MODE = 0x2;/A上升沿延时 B下降沿延时 EPwm1Regs.DBCTL.bit.POLSEL = 0x2;/A不取反 B取反 EPwm1Regs.DBCTL.bit.OUT_MODE = 0x2;/AB全部用加了延时的输出 EPwm1Regs.DBFED = FED_Cnst;/上升沿死区时间 FED=DBFED*TBCLK EPwm1Regs.DBRED = RED_Cnst;/下降沿死区时间 /* /TZ模块，外部发生错误时，即TZn有输入时，PWMA/PWMB输出强制为高阻 /外部发生错误时，即TZn有输入时，执行一