程式功能：
1 PWM生成
2 PWM觸發3路采樣
注：主要是對EPWM子產品裡的事件觸發子產品進行配置，然後把這些采樣讀取 資料的程式寫到PWM中斷裡面去。
#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; // 系統外設時鐘6分頻，一般ADC就用6分頻
// 這是因為ADC最高隻能配置25MHz的頻率
// 是以最快轉換一次的時間使80ns
EDIS;
InitXintf16Gpio();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
InitAdc(); //這個初始化程式，必須添加DSP2833x_Adc.C檔案
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采樣時間選擇
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS; //ADC核心分頻
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; //級聯工作方式
AdcRegs.ADCTRL3.bit.SMODE_SEL= 0; // 順序采樣
AdcRegs.ADCTRL1.bit.CONT_RUN = 1; //連續采樣
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1 ; //完成排序後，排序器指針回到最初狀态
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; //軟體啟動轉換功能
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1; //允許向CPU發出中斷請求
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的中斷位為1
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; //清楚排序器中斷位
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; // 轉換為我們讀取的資料類型
adc1=(float)SampleTable[1] * 3.0 /4096.0; // 資料類型轉換另外一篇有說明
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; //時基計數器清零
EPwm1Regs.TBPRD = 75; //TBPRD 65536
EPwm1Regs.CMPA.half.CMPA = 37;
EPwm1Regs.CMPB = 30;
EPwm1Regs.TBCTL.bit.CTRMODE = UP_DOWN; //增計數
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; //關閉同步信号
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.TZFLG.all=0;
EPwm1Regs.TZCLR.all=0;
EPwm1Regs.TZFRC.all=0;
EPwm1Regs.ETSEL.all=0; // Interrupt when TBCTR = 0x0000
EPwm1Regs.ETFLG.all=0;
EPwm1Regs.ETCLR.all=0;
EPwm1Regs.ETFRC.all=0;
EPwm1Regs.PCCTL.all=0;
EPwm1Regs.ETSEL.bit.INTEN =1; //打開事件觸發中斷
EPwm1Regs.ETSEL.bit.INTSEL=1; //一次事件觸發
EPwm1Regs.ETSEL.bit.SOCAEN =1; //使能epwmxSOCA信号産生
EPwm1Regs.ETSEL.bit.SOCASEL=4; //向上計數 TBCTR=CMPA産生epwmxSOCA信号
EPwm1Regs.ETSEL.bit.SOCBEN =1; //使能epwmxSOCB信号産生
EPwm1Regs.ETSEL.bit.SOCBSEL=4; //向上計數 TBCTR=CMPB産生epwmxSOCB信号
EPwm1Regs.ETPS.bit.INTPRD =1; //第一個事件時産生SOC信号
EPwm1Regs.ETPS.bit.SOCAPRD=1;
EPwm1Regs.ETPS.bit.SOCBPRD=1;
EPwm1Regs.ETCLR.bit.INT=1;
}
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