TMS320F280039C: 28003x的ADC与28004x有什么区别

之前用0049控制电机马达一直正常，移植到0039后开始出现电机转速抖动现象，分析是AD采样问题。两个系列的ADC有什么不同和转移事项吗

Ben Qin：

你好，关于这两个型号芯片之间的移植你可以参考下这个文件：

www.ti.com/…/spruiw3.pdf

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fuqiang fu：

文档看不出两款芯片的ADC有差别，实际情况控制效果确实存在差别，同样的程序之前使用28034,28335都没有问题。还有可能是哪方面原因导致ADC采样会变差

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Ben Qin：

移植的话需要根据上面我发的文件来移植。如果ADC没有差别的话，那么实际情况不一样也可能是一些其他工程里面的移植细节没有注意到而导致的。具体是那一方面我无从得知，需要根据您的工程以及实际情况来分析。

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senfeng wang：

我使用28003X的时候也遇到了这个问题，AD采样在正常的时候会被干扰导致采样相比于实际值有一个下跌，后面发现是PWM动作的时候相应的SOC序列采样会有异常下跌，具体为什么会有这种干扰也不知道原因，之前听人说003X的抗干扰不行，不知道这是不是具体的表现

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Ben Qin：

请开一个新帖以详细说明

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fuqiang fu：

重新画了板子，现象还是一样，下面是ADC的初始化程序，帮忙看下是否有错误

void InitSetAdc(Uint type){ volatile Uint waite; int trigsel; trigsel = 5; //EALLOW;#define ANALOGSUBSYS_BASE 0x0005D700U ADC_setVREF(ANALOGSUBSYS_BASE, 0, 0); //AnalogSubsysRegs.ANAREFCTL.bit.ANAREFSEL = 0; // 内部基准,1.65(0~3.3V) //AnalogSubsysRegs.ANAREFCTL.bit.ANAREFBSEL = 0; //AnalogSubsysRegs.ANAREFCTL.bit.ANAREFCSEL = 0; EALLOW; AdcaRegs.ADCCTL2.bit.PRESCALE = 0x02; AdcbRegs.ADCCTL2.bit.PRESCALE = 0x02; AdccRegs.ADCCTL2.bit.PRESCALE = 0x02;

AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1; //All analog circuitry inside the core is powered up AdcbRegs.ADCCTL1.bit.ADCPWDNZ = 1; AdccRegs.ADCCTL1.bit.ADCPWDNZ = 1; //============================================================================================ //复位 for(waite = 0;waite<5000;waite++){} //延时 //———————————————————————————————— asm(" RPT #28 || NOP"); // 需延时两个ADCCLK；延时28个空周期 //以下开始设置ADC的控制寄存器、转换通道选择寄存器等 AdcaRegs.ADCBURSTCTL.bit.BURSTEN = 0; // SOC Burst Mode Enable AdcbRegs.ADCBURSTCTL.bit.BURSTEN = 0; // SOC Burst Mode Enable AdccRegs.ADCBURSTCTL.bit.BURSTEN = 0; // SOC Burst Mode Enable

//AdcaRegs.ADCOFFTRIM.all = 0; //AdcbRegs.ADCOFFTRIM.all = 0; //AdccRegs.ADCOFFTRIM.all = 0;

AdcbRegs.ADCINTSEL1N2.bit.INT1SEL = 4; // 通道3转换完成产生中断ADCINT1 if (0 == type) { AdcbRegs.ADCINTSEL1N2.bit.INT1E = 1; // ADCINT1 is enabled } else { AdcbRegs.ADCINTSEL1N2.bit.INT1E = 0; // ADCINT1 is disabled } AdcbRegs.ADCINTOVFCLR.bit.ADCINT1 = 1;

#define ADC_IW_A2 0x02 // IW A2#define ADC_AI4_A5 0x05 // AI4 A5#define ADC_VV_A6 0x06 // VV A6

#define ADC_IU_B2 0x02 // IU B2#define ADC_VDC_B5 0x05 // VDC B5#define ADC_AI5_B8 0x08 // AI5 B8#define ADC_AI6_B9 0x09 // AI6 B9#define ADC_IV_B11 0x0B // IV B11

#define ADC_UV_C0 0x00 // UV C0#define ADC_AI1_C2 0x02 // AI1 C2#define ADC_TD_C3 0x03 // TD C3#define ADC_WV_C4 0x04 // WV C4#define ADC_AI2_C5 0x05 // AI2 C5

#define ADC_ACQPS 2 //********************************ePWM1 ADCSOCA触发， AdcaRegs.ADCSOC0CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC2CTL.bit.CHSEL = ADC_IW_A2; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC0CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale /* AdcaRegs.ADCSOC1CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC1CTL.bit.CHSEL = ADC_IW_A2; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC1CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcaRegs.ADCSOC2CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC2CTL.bit.CHSEL = ADC_IW_A2; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC2CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcaRegs.ADCSOC3CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC3CTL.bit.CHSEL = ADC_IW_A2; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC3CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale */ AdcaRegs.ADCSOC1CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC1CTL.bit.CHSEL = ADC_AI4_A5; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC1CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcaRegs.ADCSOC2CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcaRegs.ADCSOC0CTL.bit.CHSEL = ADC_VV_A6; // 18:15 SOC0 Channel Select AdcaRegs.ADCSOC2CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale

AdcbRegs.ADCSOC0CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC2CTL.bit.CHSEL = ADC_IU_B2; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC0CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale /* AdcbRegs.ADCSOC1CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC1CTL.bit.CHSEL = ADC_IU_B2; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC1CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcbRegs.ADCSOC2CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC2CTL.bit.CHSEL = ADC_IU_B2; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC2CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcbRegs.ADCSOC3CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC3CTL.bit.CHSEL = ADC_IU_B2; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC3CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale */ AdcbRegs.ADCSOC1CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC1CTL.bit.CHSEL = ADC_VDC_B5; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC1CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcbRegs.ADCSOC2CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC0CTL.bit.CHSEL = ADC_AI5_B8; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC2CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcbRegs.ADCSOC3CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC3CTL.bit.CHSEL = ADC_AI6_B9; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC3CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdcbRegs.ADCSOC4CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdcbRegs.ADCSOC4CTL.bit.CHSEL = ADC_IV_B11; // 18:15 SOC0 Channel Select AdcbRegs.ADCSOC4CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale

AdccRegs.ADCSOC0CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdccRegs.ADCSOC0CTL.bit.CHSEL = ADC_UV_C0; // 18:15 SOC0 Channel Select AdccRegs.ADCSOC0CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdccRegs.ADCSOC1CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdccRegs.ADCSOC1CTL.bit.CHSEL = ADC_AI1_C2; // 18:15 SOC0 Channel Select AdccRegs.ADCSOC1CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdccRegs.ADCSOC2CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdccRegs.ADCSOC2CTL.bit.CHSEL = ADC_TD_C3; // 18:15 SOC0 Channel Select AdccRegs.ADCSOC2CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdccRegs.ADCSOC3CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdccRegs.ADCSOC3CTL.bit.CHSEL = ADC_WV_C4; // 18:15 SOC0 Channel Select AdccRegs.ADCSOC3CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdccRegs.ADCSOC4CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA AdccRegs.ADCSOC4CTL.bit.CHSEL = ADC_AI2_C5; // 18:15 SOC0 Channel Select AdccRegs.ADCSOC4CTL.bit.ACQPS = ADC_ACQPS; // 8:0 SOC0 Acquisition Prescale AdccRegs.ADCSOC5CTL.bit.TRIGSEL = trigsel; //ePWM1, ADCSOCA

AdcbRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; EDIS; }

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fuqiang fu：

补充下 #define ADC_ACQPS 最大设置到50，都是同样的现象

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Ben Qin：

fuqiang fu said:移植到0039后开始出现电机转速抖动现象

还是会有抖动现象是吗?

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senfeng wang：

你有没有注意过你的SOC是在什么时间触发的，有没有和EPWM做同步，如果soc开始的时刻恰好和pwm动作的时刻（开通或者关断）重合，003X的采样是会有异常，这是我观察到的现象

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fuqiang fu：

是的

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fuqiang fu：

SOC是EPWM上溢和下溢触发的。你说的PWM开通关断影响AD采样是有可能的，因为电机转速低是正常的，电机运行到80%额定转速时就会出现抖动，这时候PWM输出的电压矢量比较大，PWM开通关断是接近于SOC触发点的

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Ben Qin：

是只有003x会有异常吗？其他型号的芯片呢？有尝试过吗

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senfeng wang：

目前只用003X这样用了，其他的芯片都是开关频率较低，每个开关周期都触发soc和中断，所以采样和pwm动作是同步的，避开了在动作时触发采样，目前的新工程开关频率较高，而且还使用了变频控制，pwm没有再和采样同步了，所以就发现了这个问题，其他的芯片我没有这么用过

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Ben Qin：

我咨询下相关工程师后回复您。

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fuqiang fu：

你好，相关工程师有回复吗