TMS320F280039: ADC DMA 280039

一、疑问

之前帖子https://e2echina.ti.com/support/microcontrollers/c2000/f/c2000-microcontrollers-forum/812165/tms320f280039-timer1-adc-soc-adc-eoc-dma-ram-4-eoc-dma-dma/2981482?tisearch=e2e-sitesearch&keymatch=DMA#2981482

EPwm3Regs.TBPRD = EPWMPeriod_DC;
EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;
EPwm3Regs.TBCTL.bit.PHSDIR = TB_UP;
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm3Regs.TBPHS.bit.TBPHS = 0;
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
EPwm3Regs.EPWMSYNCINSEL.bit.SEL = SYNC_IN_SRC_DISABLE_ALL;
EPwm3Regs.EPWMSYNCOUTEN.bit.ZEROEN = SYNC_OUT_SRC_ENABLE;

EPwm8Regs.TBPRD = EPWMPeriod_DC / 8;
EPwm8Regs.TBCTL.bit.CLKDIV = TB_DIV1;
EPwm8Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;
EPwm8Regs.TBCTL.bit.PHSDIR = TB_UP;
EPwm8Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm8Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm8Regs.TBPHS.bit.TBPHS = 0;
EPwm8Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;
EPwm8Regs.EPWMSYNCINSEL.bit.SEL = SYNC_IN_SRC_SYNCOUT_EPWM3;

EPwm3Regs.ETSEL.bit.INTEN = 1;
EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_PRD;                              //标记：周期产生PWM3中断，把DMA_Data1[ ]求平均，DMA_Data2[ ]求平均，DMA_Data3[ ]求平均，
EPwm3Regs.ETPS.bit.INTPRD = ET_1ST;

EPwm8Regs.ETSEL.bit.SOCAEN = 1;
EPwm8Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO;                     //标记：触发一次SOCA, 一个PWM3周期一共产生8次SOCA(为什么有16次采样？)
EPwm8Regs.ETPS.bit.SOCAPRD = ET_1ST;
////
ADC_setInterruptSource(myADCB_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER2); // 标记：每次采样完number2产生一次ADC中断，为什么开ADC中断？产生8次ADC中断有什么用？不是需求
////
DMA_setEmulationMode(DMA_EMULATION_STOP);
DMA_configAddresses(myDMA0_BASE, 5888, 2848);
DMA_configBurst(myDMA0_BASE, 3U, 1, 16);                  // 标记：参数3:代表3个数组BUF数设置,     参数1: 怎样计算得来？参数16: 怎样计算得来？
DMA_configTransfer(myDMA0_BASE, 16U, -2, -31);         // 标记：参数16: 怎样计算得来？  参数-2: 怎样计算得来？  参数-31: 怎样计算得来？
DMA_configWrap(myDMA0_BASE, 16U, 0, 16U, 0);
DMA_configMode(myDMA0_BASE, DMA_TRIGGER_ADCB1, DMA_CFG_ONESHOT_DISABLE | DMA_CFG_CONTINUOUS_ENABLE | DMA_CFG_SIZE_16BIT);
DMA_enableTrigger(myDMA0_BASE);
DMA_startChannel(myDMA0_BASE);

ePWM3作为主PWM，每个PWM周期内通过ePWM8触发采样，采样16次，每次采样3个信号：ADCB0,ADCB1,ADCB2。将ADCB0,ADCB1,ADCB2分别存于DMA_Data1,DMA_Data2，DMA_Data3中：
DMA_Data1 : origin = 0x001700, length = 0x000010
DMA_Data2 : origin = 0x001710, length = 0x000010
DMA_Data3 : origin = 0x001720, length = 0x000010

二、需求

现在ADCA (10通道),ADCB(8通道), ADCC(7通道), PWM 零点SOCA触发采样，采样ADCA.soc9采样完 ADCA1中断, 在ADC中断中分别读取ADCA ADCB ADCC结果值和控制

需求是ADCA有10个通道, 其中有4通道需要主开关周期采样2次，通过DMA传输，其余6通道采样一次(ADCA.result读取(不行通过采样2次))，一个开关周期只中断一次用作采样计算和控制环，pwm adc DMA需要怎样配置？谢谢。