HI，TI的工程师

我简单修改组合了TI的例程

C:\ti\C2000Ware_4_00_00_00\device_support\f2837xd\examples\cpu1\adc_soc_continuous

和

C:\ti\C2000Ware_4_00_00_00\device_support\f2837xd\examples\cpu1\epwm_up_aq，

将PWM1A（launchpad标号40）连接到ADCINA0（launchpad标号30），测试LAUNCHXL-F28379D的ADC读取ePWM外设发出的信号，但watch窗口显示AdcaResult0值始终为0

示波器测试ePWM输出波形正常

以下是我的代码，编译运行均无报错

//
// Included Files
//
#include "F28x_Project.h"

//
// Defines
//
#define EPWM1_TIMER_TBPRD  2000  // Period register
#define EPWM1_MIN_CMPA500

//
// Globals
//
typedef struct
{volatile struct EPWM_REGS *EPwmRegHandle;Uint16 EPwmMinCMPA;
}EPWM_INFO;

EPWM_INFO epwm1_info;

Uint16 AdcaResult0;

//
//  Function Prototypes
//
void InitEPwm1Example(void);
void ConfigureADC(void);
void SetupADCSoftware(void);

//
// Main
//
void main(void)
{
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2837xD_SysCtrl.c file.
//InitSysCtrl();

//
// Step 2. Initialize GPIO:
// This example function is found in the F2837xD_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
//InitGpio();

//
// Enable PWM1, PWM2 and PWM3
//CpuSysRegs.PCLKCR2.bit.EPWM1=1;

//
// For this case just init GPIO pins for ePWM1, ePWM2, ePWM3
// These functions are in the F2837xD_EPwm.c file
//InitEPwm1Gpio();

//
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
//DINT;

//
// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the F2837xD_PieCtrl.c file.
//InitPieCtrl();

//
// Disable CPU interrupts and clear all CPU interrupt flags:
//IER = 0x0000;IFR = 0x0000;

//
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in F2837xD_DefaultIsr.c.
// This function is found in F2837xD_PieVect.c.
//InitPieVectTable();


//
// For this example, only initialize the ePWM
//EALLOW;CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 0;EDIS;InitEPwm1Example();EALLOW;CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;EDIS;

//
// Step 4. User specific code, enable interrupts:
//
// Enable CPU INT3 which is connected to EPWM1-3 INT:
//IER |= M_INT3;

//
// Enable EPWM INTn in the PIE: Group 3 interrupt 1-3
//PieCtrlRegs.PIEIER3.bit.INTx1 = 1;

//
// Enable global Interrupts and higher priority real-time debug events:
//EINT;  // Enable Global interrupt INTMERTM;  // Enable Global realtime interrupt DBGM////Configure the ADCs and power them up//ConfigureADC();////Setup the ADCs for software conversions//SetupADCSoftware();////take conversions indefinitely in loop//do{////convert, wait for completion, and store results//start conversions immediately via software, ADCA//AdcaRegs.ADCSOCFRC1.all = 0x0001; //SOC0////wait for ADCA to complete, then acknowledge flag//while(AdcaRegs.ADCINTFLG.bit.ADCINT1 == 0);AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;////store results//AdcaResult0 = AdcaResultRegs.ADCRESULT0;////at this point, conversion results are stored in//AdcaResult0, AdcaResult1, AdcbResult0, and AdcbResult1//////software breakpoint, hit run again to get updated conversions//asm("ESTOP0");}while(1);

}



//
// InitEPwm1Example - Initialize EPWM1 values
//
void InitEPwm1Example()
{//// Setup TBCLK//EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count upEPwm1Regs.TBPRD = EPWM1_TIMER_TBPRD;// Set timer periodEPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;// Disable phase loadingEPwm1Regs.TBPHS.bit.TBPHS = 0x0000;// Phase is 0EPwm1Regs.TBCTR = 0x0000;// Clear counterEPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV2;// Clock ratio to SYSCLKOUTEPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV2;//// Setup shadow register load on ZERO//EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;//// Set Compare values//EPwm1Regs.CMPA.bit.CMPA = EPWM1_MIN_CMPA;// Set compare A value//// Set actions//EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET;// Set PWM1A on ZeroEPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR;// Clear PWM1A on event A,// up count

}

//
// ConfigureADC - Write ADC configurations and power up the ADC for both
//ADC A and ADC B
//
void ConfigureADC(void)
{EALLOW;////write configurations//AdcaRegs.ADCCTL2.bit.PRESCALE = 6; //set ADCCLK divider to /4AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);////Set pulse positions to late//AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1;////power up the ADCs//AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1;////delay for 1ms to allow ADC time to power up//DELAY_US(1000);EDIS;
}

//
// SetupADCSoftware - Setup ADC channels and acquisition window
//
void SetupADCSoftware(void)
{Uint16 acqps;////determine minimum acquisition window (in SYSCLKS) based on resolution//acqps = 14; //75ns////Select the channels to convert and end of conversion flag//ADCA//EALLOW;AdcaRegs.ADCSOC0CTL.bit.CHSEL = 0;  //SOC0 will convert pin A0AdcaRegs.ADCSOC0CTL.bit.ACQPS = acqps; //sample window is acqps +//1 SYSCLK cyclesAdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 1; //end of SOC1 will set INT1 flagAdcaRegs.ADCINTSEL1N2.bit.INT1E = 1;//enable INT1 flagAdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //make sure INT1 flag is clearedEDIS;
}


//
// End of file
//

请问AdcaResult0无数据是什么原因呢？

谢谢！

Green Deng：

好像查看AdcaResult是看不出采样值，太久没跑这个例程有点忘了。印象中例程里面应该是建了个数组，数组中可以读取采样值。

,

Xy Zhang：

我是用了一个16位的整型来储存AdcaResult

AdcaResult0 = AdcaResultRegs.ADCRESULT0;

但是读取AdcaResult0显示采样值一直为0

以BOOST'XL-DRV8301为例，三相电流的检测电阻位于下桥臂驱动管与GND之间

检流放大器设计如下：

检测电阻P端连接至放大器负端，电阻N端连接至放大器正端，即采用了负极性连接方式，如InstaSPIN说明文档中的描述：

代码处理如下：

可以看到，虽然是负极性连接方式，但是电流的offset是正值，HAL_getCurrentScaleFactor也没有取反，也是正值

问题1.如果采用以上硬件电路设计方式和软件计算方法，采集得到的相电流相位应该是与电机相电流同向的吧？

问题2.我理解这里用负极性连接方式，是因为检测电阻在下桥臂驱动管与GND之间，电阻上流过的电流都是从每相绕组流出的，也就是电阻上流过的电流与电机相电流相位差180度，所以使用负极性连接方式，这样放大器输出的检测信号的极性就与电机相电流同相了，不知道这个理解对不对？

BOOSTXL-3PHGANINV开发套件中使用INA240A1检测电机相电流

其典型应用如下图所示：

由上图理解，采样电阻串接在三相绕组中，这与采样电阻串接在下桥臂与GND之间的连接方式不同，因此在这里的典型应用图中使用了正反馈连接方式。

然而，BOOSTXL-3PHGANINV中的INA240使用了负反馈的连接方式，如下图所示：

问题3：采样电阻串在电机每相中，为什么也要采用负极性的连接方式呢？

Cherry Zhou：

您好，能否请您再重新上传下最后两张图片？我这边显示不出来哦。

,

user78960159：

好的 感谢帮助

未显示的第一张图是ina240典型应用

第二张图为氮化镓开发板电流采集部分原理图

Ti是否有TCM控制下的逆变器相关的参考设计呀

Green Deng：

你好，你是指基于TCM系列芯片的逆变器相关参考设计吗？比如TCM1050