2812 ADC采样程序.doc

本程序采用EVA中断启动ADC转换，级联模式6通道顺序采样：DSP28_Adc.c：void InitAdc(void) unsigned int i; AdcRegs.ADCTRL1.bit.RESET=1;asm( RPT # 10 | NOP); /等待12个周期，复位adc模块AdcRegs.ADCTRL3.bit.ADCBGRFDN=3;for(i=0;i10000;i+)asm( NOP); / 能带隙和参考电路上电AdcRegs.ADCTRL3.bit.ADCPWDN=1;for(i=0;i5000;i+)asm( NOP); / 内核内的模拟电路上电AdcRegs.ADCTRL3.bit.ADCCLKPS=15; /核时钟分频器AdcRegs.ADCTRL3.bit.SMODE_SEL=0; /顺序采样模式AdcRegs.ADCTRL1.bit.RESET=0;AdcRegs.ADCTRL1.bit.SUSMOD=3;/仿真挂起时，序列发生器和其他轮询程序逻辑立即停止AdcRegs.ADCTRL1.bit.ACQ_PS=0; /控制SOC脉宽AdcRegs.ADCTRL1.bit.CPS=0; /内核时钟预分频AdcRegs.ADCTRL1.bit.CONT_RUN=0; /启动停止模式到达EOS后序列发生器停止AdcRegs.ADCTRL1.bit.SEQ_CASC=1; /级联模式，SEQ1和SEQ2作为单个16状态序列发生器工作AdcRegs.MAX_CONV.bit.MAX_CONV=0x0005; AdcRegs.CHSELSEQ1.bit.CONV00=0x0; AdcRegs.CHSELSEQ1.bit.CONV01=0x1; AdcRegs.CHSELSEQ1.bit.CONV02=0x2; AdcRegs.CHSELSEQ1.bit.CONV03=0x3; AdcRegs.CHSELSEQ2.bit.CONV04=0x4; AdcRegs.CHSELSEQ2.bit.CONV05=0x5;AdcRegs.ADCTRL2.bit.EVB_SOC_SEQ=0;AdcRegs.ADCTRL2.bit.RST_SEQ1=0;AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1;AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1=1;AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;AdcRegs.ADCTRL2.bit.RST_SEQ2=0;AdcRegs.ADCTRL2.bit.SOC_SEQ2=0;AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=0;AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;AdcRegs.ADCTRL2.bit.EVB_SOC_SEQ2=0;/AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;/使能ADC中断PieCtrl.PIEIER1.bit.INTx6=1;IER |= M_INT1;AD.c文件：#include DSP28_Device.hunsigned int Send_Flag;unsigned int i;char *strg=abcd;float ad6=0,1,2,3,4,5;float adclo=0.0;int ad_freq=0;void DelayNmSec(int N)unsigned int j;while(N-)for(j=0;j0) SciaRegs.SCITXBUF=*Tx+;elselength=0;EvaRegs.EVAIMRB.bit.T2PINT=1;/中断允许EvaRegs.EVAIFRB.bit.T2PINT=1;/清除中断标志PieCtrl.PIEACK.bit.ACK3=1;/向cpu申请中断interrupt void AD_ISR(void) ad_freq+;if(ad_freq=6)ad0=(AdcRegs.RESULT04)*3)/4095.0+adclo;ad1=(AdcRegs.RESULT14)*3)/4095.0+adclo;ad2=(AdcRegs.RESULT24)*3)/4095.0+adclo;ad3=(AdcRegs.RESULT34)*3)/4095.0+adclo;ad4=(AdcRegs.RESULT44)*3)/4095.0+adclo;ad5=(AdcRegs.RESULT54)*3)/4095.0+adclo;ad_freq=0; / Reinitialize for next ADC sequenceAdcRegs.ADCTRL2.bit.RST_SEQ1=1;AdcRegs.ADC_ST_FLAG.bit.INT_SEQ1_CLR=1;PieCtrl.PIEACK.bit.ACK1=1;void main(void)/*初始化系统*/InitSysCtrl();/*关中断*/DINT;IER = 0x0000;IFR = 0x0000;/*初始化PIE中断*/InitPieCtrl();/*初始化PIE中断矢量表*/InitPieVectTable();/*初始化SCIA寄存器*/ InitSci(); for(i = 0; i 8; i+) Sci_VarRxi = 0;Sci_VarTxi = 0; Rx=Sci_VarRx; Tx=Sci_VarTx; Send_Flag = 0; rx_length=0; add=0; length=9;/ 初始化定时器2/*EvaRegs.GPTCONA.all=0; EvaRegs.T2PR =0x1500; / 定时器2的周期为20k EvaRegs.EVAIMRB.bit.T2PINT = 1;/定时器2周期中断允许 EvaRegs.EVAIFRB.bit.T2PINT = 1;/清除标志 EvaRegs.T2CNT =0x0000; / Timer2 counter EvaRegs.T2CON.all =0x1440;/16分频,使能定时器操作，连续增模式*/*初始化ADC寄存器*/InitAdc();/*设置中断服务程序入口地址*/EALLOW;/ This is needed to write to EALLOW protected registersPieVectTable.TXAINT = &SCITXINTA_ISR;PieVectTable.RXAINT = &SCIRXINTA_ISR;/PieVectTable.T2PINT = &T2PINT_ISR;PieVectTable.ADCINT = &AD_ISR;EDIS; / This is needed to disable write to EALLOW protected registers/PieCtrl.PIEIER3.bit.INTx1=1;/T2pint中断/*开中断*/IER |= M_INT9;/IER |= M_INT3; / t1pint enableEINT; / Enable Global interrupt INTMERTM;/ Enable Global realtime interrupt DBGM/配置时间管理器EVA time1EvaRegs.T1PR=0x1500;EvaRegs.GPTCONA.bit