失眠网 > 【DSP】TMS320F28335的ADC模块

【DSP】TMS320F28335的ADC模块

时间：2024-06-15 14:50:10

一、功能说明

12位内建采样保持的模数转换器模拟输入电平：0~3V16个转换通道最快转换时钟频率12.5MHz（奈奎斯特定则，25MHz最高能采样12.5MHz的信号）多触发源：软件、ePWM和GPIO两种采样模式：级联和双通道模式

软件设置流程

//1.ADC时钟使能SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;//在InitSysCtrl()函数里//2.时钟分频EALLOW;SysCtrlRegs.HISPCP.all = 0x3;//HSPCLK = SYSCLKOUT/2*HISPCP = 150/(2*3) = 25.0 MHzADC_cal();EDIS;AdcRegs.ADCTRL3.all = 0x00E0; // Power up bandgap/reference/ADC circuitsDELAY_US(ADC_usDELAY); // Delay before converting ADC channelsAdcRegs.ADCTRL3.bit.ADCCLKPS = 0x0;//Fclk = HSPCLK/(2*ADCCLKPS),但当ADCCLKPS=0时，Fclk = HSPCLKAdcRegs.ADCTRL1.bit.CPS = 0x0;//ADCCLK = Fclk / (CPS+1)//3.通道设置//4.触发源设置//5.中断源设置

二、模式说明

2.1 级联模式

//3.通道设置AdcRegs.ADCTRL1.bit.SEQ_CASC = 0x1;//0-dual, 1-CascadedAdcRegs.ADCMAXCONV.all = 0x000F; // Setup 16 conv's on SEQAdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // Setup ADCINA0 as 1st SEQ conv.AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1; // Setup ADCINA1 as 2nd SEQ conv.AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2; // Setup ADCINA2 as 3rd SEQ conv.AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3; // Setup ADCINA3 as 4th SEQ conv.AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4; // Setup ADCINA4 as 5th SEQ conv.AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5; // Setup ADCINA5 as 6th SEQ conv.AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6; // Setup ADCINA6 as 7th SEQ conv.AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7; // Setup ADCINA7 as 8th SEQ conv.AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8; // Setup ADCINB0 as 9th SEQ conv.AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9; // Setup ADCINB1 as 10th SEQ conv.AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA; // Setup ADCINB2 as 11th SEQ conv.AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB; // Setup ADCINB3 as 12th SEQ conv.AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC; // Setup ADCINB4 as 13th SEQ conv.AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD; // Setup ADCINB5 as 14th SEQ conv.AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE; // Setup ADCINB6 as 15th SEQ conv.AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF; // Setup ADCINB7 as 16th SEQ conv.

2.2 双通道模式

//3.通道设置AdcRegs.ADCTRL1.bit.SEQ_CASC = 0x0;//0-dual, 1-CascadedAdcRegs.ADCMAXCONV.all = 0x0077; // Setup 8 conv's on SEQ1 and 8 conv's on SEQ2AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // Setup ADCINA0 as 1st SEQ1 conv.AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1; // Setup ADCINA1 as 2nd SEQ1 conv.AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2; // Setup ADCINA2 as 3rd SEQ1 conv.AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3; // Setup ADCINA3 as 4th SEQ1 conv.AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4; // Setup ADCINA4 as 5th SEQ1 conv.AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5; // Setup ADCINA5 as 6th SEQ1 conv.AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6; // Setup ADCINA6 as 7th SEQ1 conv.AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7; // Setup ADCINA7 as 8th SEQ1 conv.AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8; // Setup ADCINB0 as 1st SEQ2 conv.AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9; // Setup ADCINB1 as 2nd SEQ2 conv.AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA; // Setup ADCINB2 as 3rd SEQ2 conv.AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB; // Setup ADCINB3 as 4th SEQ2 conv.AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC; // Setup ADCINB4 as 5th SEQ2 conv.AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD; // Setup ADCINB5 as 6th SEQ2 conv.AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE; // Setup ADCINB6 as 7th SEQ2 conv.AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF; // Setup ADCINB7 as 8th SEQ2 conv.

三、触发源

//4.触发源设置AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;//软触发（用于级联、双通道1#）AdcRegs.ADCTRL2.bit.SOC_SEQ2 = 1;//软触发（用于双通道2#）AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;//ePWM触发（用于双通道1#）AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ2 = 1;//ePWM触发（用于双通道2#）AdcRegs.ADCTRL2.bit.EPWM_SOCB_SEQ = 1;//ePWM触发（用于级联）

四、中断源

//5.中断源设置AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; //用于级联、双通道1#AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2 = 1; //双通道2#

五、接收转换结果

5.1 中断式

/** AD的外部中断程序【中等优先级】* 中断触发信号：EPWM*/interrupt void ADC_ISR(void){Voltage[0] = AdcRegs.ADCRESULT0 >>4;Voltage[1] = AdcRegs.ADCRESULT1 >>4;Voltage[2] = AdcRegs.ADCRESULT2 >>4;Voltage[3] = AdcRegs.ADCRESULT3 >>4;Voltage[4] = AdcRegs.ADCRESULT4 >>4;Voltage[5] = AdcRegs.ADCRESULT5 >>4;Voltage[6] = AdcRegs.ADCRESULT6 >>4;Voltage[7] = AdcRegs.ADCRESULT7 >>4;Voltage[8] = AdcRegs.ADCRESULT8 >>4;Voltage[9] = AdcRegs.ADCRESULT9 >>4;Voltage[10] = AdcRegs.ADCRESULT10 >>4;Voltage[11] = AdcRegs.ADCRESULT11 >>4;Voltage[12] = AdcRegs.ADCRESULT12 >>4;Voltage[13] = AdcRegs.ADCRESULT13 >>4;Voltage[14] = AdcRegs.ADCRESULT14 >>4;Voltage[15] = AdcRegs.ADCRESULT15 >>4;// Reinitialize for next ADC sequenceAdcRegs.ADCTRL2.bit.RST_SEQ1 = 1; // Reset SEQ1AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; // Clear INT SEQ1 bitPieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIEreturn;}

5.2 查询式

while(AdcRegs.ADCST.bit.INT_SEQ1 == 0);test[0] = AdcRegs.ADCRESULT0 >>4;test[1] = AdcRegs.ADCRESULT1 >>4;test[2] = AdcRegs.ADCRESULT2 >>4;test[3] = AdcRegs.ADCRESULT3 >>4;test[4] = AdcRegs.ADCRESULT4 >>4;test[5] = AdcRegs.ADCRESULT5 >>4;test[6] = AdcRegs.ADCRESULT6 >>4;test[7] = AdcRegs.ADCRESULT7 >>4;test[8] = AdcRegs.ADCRESULT8 >>4;test[9] = AdcRegs.ADCRESULT9 >>4;test[10] = AdcRegs.ADCRESULT10 >>4;test[11] = AdcRegs.ADCRESULT11 >>4;test[12] = AdcRegs.ADCRESULT12 >>4;test[13] = AdcRegs.ADCRESULT13 >>4;test[14] = AdcRegs.ADCRESULT14 >>4;test[15] = AdcRegs.ADCRESULT15 >>4;AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;// Reset SEQ1AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;