F28335 PWM触发ADC采样代码+注释

1万 · 2020-11-6 11:46

程序功能：
1 PWM生成
2 PWM触发3路采样
注：主要是对EPWM模块里的事件触发模块进行配置，然后把这些采样读取数据的程序写到PWM中断里面去。

#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File

#define POST_SHIFT 0  // Shift results after the entire sample table is full
#define INLINE_SHIFT 1  // Shift results as the data is taken from the results regsiter
#define NO_SHIFT    0  // Do not shift the results

// ADC start parameters
#if (CPU_FRQ_150MHZ)    // Default - 150 MHz SYSCLKOUT
  #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
#endif
#if (CPU_FRQ_100MHZ)
  #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz
#endif
#define ADC_CKPS 0x0 // ADC module clock = HSPCLK/1    = 25.5MHz/(1) = 25.0 MHz
#define ADC_SHCLK  0x1 // S/H width in ADC module periods                = 2 ADC cycle
#define AVG       1000  // Average sample limit
#define ZOFFSET 0x00
#define BUF_SIZE 6

volatile Uint16 SampleTable[BUF_SIZE];
volatile float adc0=0;
volatile float adc1=0;
volatile float adc2=0;

void ChoseCap(void);
void EPwmSetup();
void SetCap1Mode(void);
void SetCap2Mode(void);

Uint32 t1=0,t2=0,t3=0,t4=0,T1=0,T2=0,t5,t6,t7,t8,T3,T4,i,led=0,freq=0,duty=1,T1_temp=1,T2_temp=1;
interrupt void ISRCap1(void);
interrupt void ISRCap2(void);
interrupt void epwm_int(void);
void InitCapl();
Uint16 array_index;

void main(void)
{

InitSysCtrl();

EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; //  系统外设时钟6分频，一般ADC就用6分频
                                    //  这是因为ADC最高只能配置25MHz的频率
                                    //  所以最快转换一次的时间使80ns
EDIS;

InitXintf16Gpio();

DINT;

InitPieCtrl();

IER = 0x0000;
IFR = 0x0000;

InitPieVectTable();

InitAdc();                               //这个初始化程序，必须添加DSP2833x_Adc.C文件

   EALLOW;
   PieVectTable.EPWM1_INT = &epwm_int;
   EDIS;

   IER |= M_INT3;
   //IER |= M_INT14;

   PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
   EINT;
   ERTM;

   AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;    //ADC采样时间选择
   AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS; //ADC内核分频
   AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;          //级联工作方式
   AdcRegs.ADCTRL3.bit.SMODE_SEL= 0;          // 顺序采样
   AdcRegs.ADCTRL1.bit.CONT_RUN = 1;          //连续采样
   AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1 ;          //完成排序后，排序器指针回到最初状态

   AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x2;
   AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;
   AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1 ;
   AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2 ;
   AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1; //软件启动转换功能
   AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1; //允许向CPU发出中断请求

   for (i=0; i<BUF_SIZE; i++)
   {
      SampleTable[i] = 0;

   }

EPwmSetup();

for(; ;)
{

}

}

interrupt void epwm_int(void)
{

led++;
if(led==100)
{led=0;}
      if(array_index>BUF_SIZE)
            array_index = 0;

         while(AdcRegs.ADCST.bit.INT_SEQ1 == 0);                //等待ADC的中断位为1
         AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;                   //清楚排序器中断位

         SampleTable[array_index++]= ( (AdcRegs.ADCRESULT0)>>4);
         SampleTable[array_index++]= ( (AdcRegs.ADCRESULT1)>>4);
         SampleTable[array_index++]= ( (AdcRegs.ADCRESULT2)>>4);

         adc0=(float)SampleTable[0] * 3.0 /4096.0;             // 转换为我们读取的数据类型
         adc1=(float)SampleTable[1] * 3.0 /4096.0;             // 数据类型转换另外一篇有说明
         adc2=(float)SampleTable[2] * 3.0 /4096.0;

PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
   EPwm1Regs.ETCLR.bit.INT=1;

}

#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File

#if (CPU_FRQ_150MHZ)
  #define CPU_CLK 150e6
#endif
#if (CPU_FRQ_100MHZ)
  #define CPU_CLK 100e6
#endif
#define PWM_CLK 10e3             // If diff freq. desired, change freq here.
#define SP       CPU_CLK/(2*PWM_CLK)
#define TBCTLVAL  0x200E             // Up-down cnt, timebase = SYSCLKOUT

#define UP_DOWN 2
#define UP       0
#define DOWN    1

#define CDIV_NO 0
#define CDIV_2 1
#define CDIV_4 2
#define CDIV_8 3
#define CDIV_16 4

#define HDIV_NO 0
#define HDIV_2 1

#define HDIV_4 2
#define HDIV_6 3
#define HDIV_8 4
#define HDIV_10 5

#define T_1US 75
#define T_1MS 7500

void EPwmSetup()
{
InitEPwm1Gpio();
// InitEPwm();
// EPwm1Regs.TBSTS.all=0;
EPwm1Regs.TBPHS.half.TBPHS=0;       //所有相位清零
EPwm1Regs.TBCTR=0;                //时基计数器清零

EPwm1Regs.TBPRD = 75;             //TBPRD 65536
EPwm1Regs.CMPA.half.CMPA = 37;
EPwm1Regs.CMPB = 30;

EPwm1Regs.TBCTL.bit.CTRMODE = UP_DOWN;       //增计数
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;    //禁止相位控制
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;  // 采用影子寄存器模式
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; //关闭同步信号
EPwm1Regs.TBCTL.bit.HSPCLKDIV = HDIV_NO;
EPwm1Regs.TBCTL.bit.CLKDIV = CDIV_NO;

EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // CTR = 0  epwm A 置1
EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; // CTR = CMPA epwm A 置0

EPwm1Regs.AQCTLB.bit.CBU = AQ_SET;
EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;

// EPwm1Regs.AQCTLB.all=0;
// EPwm1Regs.AQSFRC.all=0;
// EPwm1Regs.AQCSFRC.all=0;

EPwm1Regs.DBCTL.all=0xb;       // EPWMxB is inverted
EPwm1Regs.DBRED=0;
EPwm1Regs.DBFED=0;

EPwm1Regs.TZSEL.all=0;
EPwm1Regs.TZCTL.all=0;
EPwm1Regs.TZEINT.all=0;
EPwm1Regs.TZ**.all=0;
EPwm1Regs.TZCLR.all=0;
EPwm1Regs.TZFRC.all=0;

EPwm1Regs.ETSEL.all=0;          // Interrupt when TBCTR = 0x0000
EPwm1Regs.ET**.all=0;
EPwm1Regs.ETCLR.all=0;
EPwm1Regs.ETFRC.all=0;

EPwm1Regs.PCCTL.all=0;

      EPwm1Regs.ETSEL.bit.INTEN =1;  //打开事件触发中断
      EPwm1Regs.ETSEL.bit.INTSEL=1;  //一次事件触发

      EPwm1Regs.ETSEL.bit.SOCAEN =1; //使能epwmxSOCA信号产生
      EPwm1Regs.ETSEL.bit.SOCASEL=4; //向上计数 TBCTR=CMPA产生epwmxSOCA信号

      EPwm1Regs.ETSEL.bit.SOCBEN =1; //使能epwmxSOCB信号产生
      EPwm1Regs.ETSEL.bit.SOCBSEL=4; //向上计数 TBCTR=CMPB产生epwmxSOCB信号

      EPwm1Regs.ETPS.bit.INTPRD =1;  //第一个事件时产生SOC信号
      EPwm1Regs.ETPS.bit.SOCAPRD=1;
      EPwm1Regs.ETPS.bit.SOCBPRD=1;

      EPwm1Regs.ETCLR.bit.INT=1;

}