Other Parts Discussed in Thread: C2000WARE
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#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
#define SYSCLK 60E6 // 60MHz system clock
#define PWMFREQ 100E3 // 100kHz PWM frequency
#define DUTY_CYCLE 0.20// duty cycle
#define DEAD_BAND 0 // dead band
#define TB_PERIOD (SYSCLK / PWMFREQ) // Calculate period for up-down count mode to 100khz
//#define TB_PERIOD (SYSCLK / (2 * PWMFREQ)) // Calculate period for up-down count mode
//#define TB_PERIOD (SYSCLK / (4 * PWMFREQ)) // Calculate period for up-down count mode
#define DUTY_VALUE (TB_PERIOD * DUTY_CYCLE)
#define DB_VALUE (TB_PERIOD * DEAD_BAND)
//*********************************************************************
__interrupt void adc_isr(void);
void Adc_Config(void);
// Global variables used in this example:
Uint16 LoopCount;
代码在生成pwm波形的基础上，加入了基于官方例程Example_2803xAdcSoc修改而来的代码。
代码的目的是通过输入电压来改变pwm的占空比，所以需要先将pwm的代码和adc采样代码合并在一起。
adc和pwm代码作为两个独立的程序运行时是没问题的。但是两个程序合并之后adc代码就不正常了，采样值高达几万。pwm程序是正常的。
我感觉是主程序的问题：
void main(void)
{
InitSysCtrl(); // 初始化系统时钟和PLL
SetGpio(); // Initialize GPIO
DINT; // 禁止所有中断
InitPieCtrl(); // 初始化和启用CPU PIE
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable(); // 初始化PIE向量表
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // 停止所有ePWM时钟
EDIS;
SetEPWM1(); // 初始化ePWM1
SetEPWM2(); // 初始化ePWM2
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // 启动所有ePWM时钟
EDIS;
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT1 = &adc_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
//
// Step 4. Initialize all the Device Peripherals:
//
InitAdc(); // For this example, init the ADC
AdcOffsetSelfCal();
PieCtrlRegs.PIEIER1.bit.INTx1 = 1; // Enable INT 1.1 in the PIE
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
LoopCount = 0;
ConversionCount = 0;
EALLOW;
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch
AdcRegs.INTSEL1N2.bit.INT1E = 1; // Enabled ADCINT1
AdcRegs.INTSEL1N2.bit.INT1CONT = 0; // Disable ADCINT1 Continuous mode
AdcRegs.INTSEL1N2.bit.INT1SEL = 2; // setup EOC2 to trigger ADCINT1 to fire
AdcRegs.ADCSOC0CTL.bit.CHSEL = 1; //set SOC0 channel select to ADCINA1(dummy sample for rev0 errata workaround)
AdcRegs.ADCSOC1CTL.bit.CHSEL = 1; //set SOC1 channel select to ADCINA1
AdcRegs.ADCSOC2CTL.bit.CHSEL = 2; //set SOC2 channel select to ADCINA2
AdcRegs.ADCSOC3CTL.bit.CHSEL = 3; //set SOC3 channel select to ADCINA3
AdcRegs.ADCSOC4CTL.bit.CHSEL = 4; //set SOC4 channel select to ADCINA4
AdcRegs.ADCSOC5CTL.bit.CHSEL = 6; //set SOC5 channel select to ADCINA6
AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 9; //set SOC0 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC1CTL.bit.TRIGSEL = 9; //set SOC1 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC2CTL.bit.TRIGSEL = 9; //set SOC2 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC3CTL.bit.TRIGSEL = 9; //set SOC3 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC4CTL.bit.TRIGSEL = 9; //set SOC4 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC5CTL.bit.TRIGSEL = 9; //set SOC5 start trigger on EPwm3A, due to round-robin SOC0 converts first then SOC1, then SOC2
AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; //set SOC0 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
AdcRegs.ADCSOC1CTL.bit.ACQPS = 6; //set SOC1 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
AdcRegs.ADCSOC2CTL.bit.ACQPS = 6; //set SOC2 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
AdcRegs.ADCSOC3CTL.bit.ACQPS = 6; //set SOC3 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
AdcRegs.ADCSOC4CTL.bit.ACQPS = 6; //set SOC4 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
AdcRegs.ADCSOC5CTL.bit.ACQPS = 6; //set SOC5 S/H Window to 7 ADC Clock Cycles, (9 ACQPS plus 1)
EDIS;
//
// Assumes ePWM1 clock is already enabled in InitSysCtrl();
//
EPwm3Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm3Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm3Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm3Regs.CMPA.half.CMPA = 0x0080; // Set compare A value
EPwm3Regs.TBPRD = 0xFFFF; // Set period for ePWM1
EPwm3Regs.TBCTL.bit.CTRMODE = 0; // count up and start
//
// Wait for ADC interrupt
//
for(;;)
{
LoopCount++;
}
}
不知道是不是配置的步骤有问题还是怎么的，求大神帮忙看一下。
