锁相的ＳＰＷＭ算法程序
#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"  // DSP2833x Examples Include File
#define CPU_CLK  50e6
#define PWM_CLK  6000                // If diff freq. desired, change freq here.
#define sp        CPU_CLK/(2*PWM_CLK)
void InitEPwm1Example(void);
void InitEPwm2Example(void);
void InitEPwm1Example(void)
{
      // Setup TBCLK
    EPwm1Regs.TBPRD =  sp;                      // Set  timer period
    EPwm1Regs.TBPHS.half.TBPHS = 0x0000;        // Phase is 0
    EPwm1Regs.TBCTR = 0x0000;                  // Clear counter
    // Set Compare values
    EPwm1Regs.CMPA.half.CMPA = sp/2;            // Set compare A value
    EPwm1Regs.CMPB = 0;                        // Set Compare B value
    // Setup counter mode
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;  // Count up TB_COUNT_UPDOWN
    EPwm1Regs.TBCTL.bit.PHSEN =  TB_DISABLE;        //  Disable phase loading
    EPwm1Regs.TBCTL.bit.HSPCLKDIV =  TB_DIV1;      // Clock  ratio to SYSCLKOUT
    EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;
    // Setup shadowing
    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;  // Load on Zero
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
   
    // Set actions
    EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;              // Set PWM1A on event A, up count
    EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;            // Clear PWM1A on event A, down count
   
    EPwm1Regs.AQCTLB.bit.CBU = AQ_CLEAR;            // Set PWM1B on event B, up count
    EPwm1Regs.AQCTLB.bit.CBD = AQ_SET;              // Clear PWM1B on event B, down count
   
    EPwm1Regs.DBCTL.bit.OUT_MODE=0x3;    //输出B,A翻转  看原理图
    EPwm1Regs.DBCTL.bit.POLSEL = 0x2;    //B取反逻辑
    EPwm1Regs.DBFED = 50;
    EPwm1Regs.DBRED = 70;
   
   
    // Interrupt where we will change the Compare Values
    EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;      // Select INT on Zero event
    EPwm1Regs.ETSEL.bit.INTEN = 1;                  // Enable INT             
    EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;            // Generate INT on 3rd event 
   
}
void InitEPwm2Example(void)
{
    // Setup TBCLK
    EPwm2Regs.TBPRD =  sp;                      // Set  timer period sp TBCLKs
    EPwm2Regs.TBPHS.half.TBPHS = 0x0000;        // Phase is 0
    EPwm2Regs.TBCTR = 0x0000;                  // Clear counter
   
    // Set Compare values
    EPwm2Regs.CMPA.half.CMPA = sp/2;        // Set compare A value
    EPwm2Regs.CMPB = 0;                        // Set Compare B value
float up
   
    // Setup counter mode
    EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;  // Count up TB_COUNT_UPDOWN
    EPwm2Regs.TBCTL.bit.PHSEN =  TB_DISABLE;        //  Disable phase loading
    EPwm2Regs.TBCTL.bit.HSPCLKDIV =  TB_DIV1;      // Clock  ratio to SYSCLKOUT
    EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;
    // Setup shadowing
    EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;  // Load on Zero
    EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
    // Set actions
    EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;              // Set PWM1A on event A, up count
    EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;            // Clear PWM1A on event A, down count
   
    EPwm2Regs.AQCTLB.bit.CBU = AQ_CLEAR;          // Set PWM1B on event B, up count
    EPwm2Regs.AQCTLB.bit.CBD = AQ_SET;                // Clear PWM1B on event B, down count
   
    EPwm2Regs.DBCTL.bit.OUT_MODE=0x3;//输出B,A翻转  看原理图
    EPwm2Regs.DBCTL.bit.POLSEL = 0x2; //B取反逻辑
    EPwm2Regs.DBFED = 50;
    EPwm2Regs.DBRED = 70;
   
   
    // Interrupt where we will change the Compare Values
    EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;      // Select INT on Zero event 
    EPwm2Regs.ETSEL.bit.INTEN = 1;                  // Enable INT               
    EPwm2Regs.ETPS.bit.INTPRD = ET_3RD;            // Generate INT on 3rd event               
}
</pre><pre name="code" class="objc"><pre name="code" class="objc">#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"  // DSP2833x Examples Include File
/*#define      AD_BUSY    GpioDataRegs.GPADAT.bit.GPIO6

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