使用ePWM1触发ADC的转换

mangui zhang 6 年多前

Other Parts Discussed in Thread: C2000WARE

配置ADC：

1.设置转换通道数

AdcRegs.ADCMAXCONV.all = 0x0001; // SEQ1的通道转换数是(MAXCONV+1)

2.转换通道的选择

AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.

AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x2; // Setup ADCINA2 as 2nd SEQ1 conv.

3.使能ePWM作为触发转换的信号

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1

4. 使能SEQ1的中断

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)

配置ePWM:

1.使能ePWM作为SOCA触发信号

EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group

2.SOCA信号是来自CMPA上升计数

EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from CMPA on upcount

3.SOCA周期的选择（每一次/两次/三次事件触发）

EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event

00 Disable the SOCA event counter. No EPWMxSOCA pulse will be generated
01 Generate the EPWMxSOCA pulse on the first event: ETPS[SOCACNT] = 0,1
10 Generate the EPWMxSOCA pulse on the second event: ETPS[SOCACNT] = 1,0
11 Generate the EPWMxSOCA pulse on the third event: ETPS[SOCACNT] = 1,1

4.ePWM中时基模块和计数比较模块的设置

EPwm1Regs.CMPA.half.CMPA = 0x0080; // Set compare A value

EPwm1Regs.TBPRD = 0xFFFF; // Set period for ePWM1

EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start

0 Green Deng 6 年多前

感谢分享，也可以参考TI例程：
C:\ti\c2000\C2000Ware_2_00_00_02\device_support\f2837xd\examples\cpu1\adc_soc_epwm

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使用ePWM1触发ADC的转换