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TMS320F28335 ADC

2012-07-19 分类：C2000™ 32位实时 MCU 阅读(331)

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

Forrest：

楼主所说的结果偏差很大有多大？

楼主改变一下ACQ_PS试试，看看会不会有效果。

调降ADCCLKPS不应该让ADC产生很大的误差，楼主是怎么测的？

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

zhaoqiang chen：

回复 Forrest:

1、楼主所说的结果偏差很大有多大？

答：偏差很大，也可以说结果是错的，我采到的一组数据如下：0XEDC0、0X6BC0、0XBDC0、0X81B0、0X6080。

采集电压实际值为1.267V，由电位器分压很到，用示波器看过了，很稳定

2、楼主改变一下ACQ_PS试试，看看会不会有效果。

答：试过了，有一点影响，但是还是不行，还是差不很多，

调降ADCCLKPS不应该让ADC产生很大的误差，楼主是怎么测的？

答：用仿真器真接观察的，直接读AdcRegs.ADCRESULTx ，把结果放到数组里。直接观察AdcRegs.ADCRESULTx对应的地址也不行

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

zhaoqiang chen：

回复 zhaoqiang chen:

补充：降低高速时钟也不行。

SysCtrlRegs.HISPCP.all = 0x0001;   时转换正常

SysCtrlRegs.HISPCP.all = 0x0003;  时转换错误

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

zhaoqiang chen：

回复 zhaoqiang chen:

改变MPLL（主时钟）也不行，主时钟设置为150M转换正常，设置为30M就乱了。这回我彻底晕了，请老师赐教

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

Young Hu：

回复 Forrest:

建议像Forrest说的，先用TI的例程试试看。然后把结果发上来大家再帮您看

现在有一个很奇怪的问题，我用的DSP是TMS320F28335，写了一段ADC的测试程序，发现这样一个问题：当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设置为1的时候ADC工作正常，当是当我把AdcRegs.ADCTRL3.bit.ADCCLKPS设为10的时候ADC工作不正常（采到的结果偏差很大），请高人解惑

附：

void ADCInit(void)

{

Uint16 i;

   AdcRegs.ADCTRL1.bit.RESET=1;

for(i=0;i<100;i++);

ADC_cal();

//=====================================================

AdcRegs.ADCTRL1.bit.SUSMOD=3; //3:仿真器停立即停

AdcRegs.ADCTRL1.bit.ACQ_PS=0xf; //(0-15)采集窗大小

AdcRegs.ADCTRL1.bit.CPS=0; //Core clock prescaler.

AdcRegs.ADCTRL1.bit.CONT_RUN=1; //1:Continuous conversion mode.

AdcRegs.ADCTRL1.bit.SEQ_OVRD=0; //0:Disabled Sequencer override

AdcRegs.ADCTRL1.bit.SEQ_CASC=1; //Cascaded(级联) sequencer operation.

//=====================================================

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ=0;//ePWM SOCB enable

AdcRegs.ADCTRL2.bit.RST_SEQ1=1; //1:reset sequencer

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ1=0; //1:启动序列1

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1; //Interrupt request by INT_SEQ1 is disabled.

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1=0;//SEQ1 cannot be started by ePWMx SOCA trigger.

AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;

AdcRegs.ADCTRL2.bit.RST_SEQ2=1; //resets SEQ2

for(i=0;i<100;i++);

AdcRegs.ADCTRL2.bit.SOC_SEQ2=0; //1:启动序列2(Starts SEQ2 from currently stopped position)

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1; //Interrupt request by INT_SEQ2 is enabled

AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;

AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2=0;//SEQ2 cannot be started by ePWMx SOCB trigger

AdcRegs.ADCTRL3.bit.ADCBGRFDN=3; //The bandgap and reference circuitry is powered up

AdcRegs.ADCTRL3.bit.ADCPWDN=1;

AdcRegs.ADCTRL3.bit.ADCCLKPS=1; //(0-15) n HSPCLK/[2n*(ADCTRL1[7] + 1)](n!=0) 分频设置

AdcRegs.ADCTRL3.bit.SMODE_SEL=0; //Sequential sampling mode is selected.

AdcRegs.ADCMAXCONV.bit.MAX_CONV1=5;

//AdcRegs.ADCASEQSR.all= //自动序列状态寄存器

//AdcRegs.ADCST.all= //ADC状态寄存器

AdcRegs.ADCREFSEL.bit.REF_SEL=0; //Internal reference selected (default)

AdcRegs.ADCOFFTRIM.bit.OFFSET_TRIM=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV00=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV01=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV02=0;

AdcRegs.ADCCHSELSEQ1.bit.CONV03=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV04=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV05=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV06=0;

AdcRegs.ADCCHSELSEQ2.bit.CONV07=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV08=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV09=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV10=0;

AdcRegs.ADCCHSELSEQ3.bit.CONV11=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV12=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV13=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV14=0;

AdcRegs.ADCCHSELSEQ4.bit.CONV15=0;

// AdcRegs.ADCRESULT0

}

Forrest：

回复 zhaoqiang chen:

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