dsp28_adc.c

基于dsp2812逆变电源设计 基于dsp2812逆变电源设计

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Adc.c
//
// TITLE:	DSP28 ADC Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release
//  0.56| 20 May 2002 | L.H. | No change
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"

//---------------------------------------------------------------------------
// InitAdc: 
//---------------------------------------------------------------------------
// This function initializes ADC to a known state.
//
void InitAdc(void)
{
	unsigned int i;
	//ADC控制积存器1(ADCCTRL1)的设置
	AdcRegs.ADCTRL1.bit.RESET=1;		//ADC复位
	NOP;
	AdcRegs.ADCTRL1.bit.SUSMOD=0;		//仿真挂起被忽略
	AdcRegs.ADCTRL1.bit.ACQ_PS=0;		//采样窗宽度的设置
	AdcRegs.ADCTRL1.bit.CPS=1;			//ADCLK是否二分频设置
	AdcRegs.ADCTRL1.bit.CONT_RUN=1;		//连续转化模式设置
	AdcRegs.ADCTRL1.bit.SEQ_CASC=1;		//级连模式设置


	//ADC控制积存器3(ADCCTRL3)的设置	
	AdcRegs.ADCTRL3.bit.ADCBGRFDN=3;	//带隙参考源电路关闭
	for(i=0;i<10000;i++)	NOP;
	AdcRegs.ADCTRL3.bit.ADCPWDN=1;		//DSP内核所有模拟部分开启
	for(i=0;i<5000;i++)	NOP;
	AdcRegs.ADCTRL3.bit.ADCCLKPS=15;	//ADC时钟设置，ADCLK=HPCLK/30=1.67MHz
	AdcRegs.ADCTRL3.bit.SMODE_SEL=1;	//采用同步采样模式
	
	//最大转化通道积存器(MAX_CONV)设置
	AdcRegs.MAX_CONV.bit.MAX_CONV=15;	//转化通道数设置
	
	//输入通道选择积存器(CHSELSEQ1-CHSELSEQ4)设置
	AdcRegs.CHSELSEQ1.bit.CONV00=0;
	AdcRegs.CHSELSEQ1.bit.CONV01=1;
	AdcRegs.CHSELSEQ1.bit.CONV02=2;
	AdcRegs.CHSELSEQ1.bit.CONV03=3; 
	
	AdcRegs.CHSELSEQ2.bit.CONV04=4;
	AdcRegs.CHSELSEQ2.bit.CONV05=5;
	AdcRegs.CHSELSEQ2.bit.CONV06=6;
	AdcRegs.CHSELSEQ2.bit.CONV07=7;
	
	AdcRegs.CHSELSEQ3.bit.CONV08=8;
	AdcRegs.CHSELSEQ3.bit.CONV09=9;
	AdcRegs.CHSELSEQ3.bit.CONV10=10;
	AdcRegs.CHSELSEQ3.bit.CONV11=11;
	
	AdcRegs.CHSELSEQ4.bit.CONV12=12;
	AdcRegs.CHSELSEQ4.bit.CONV13=13;
	AdcRegs.CHSELSEQ4.bit.CONV14=14;
	AdcRegs.CHSELSEQ4.bit.CONV15=15;
	
	//状态和标志积存器设置
	AdcRegs.ADC_ST_FLAG.bit.INT_SEQ1_CLR=1;		//清除中断标志位INT SEQ1
	AdcRegs.ADC_ST_FLAG.bit.INT_SEQ2_CLR=1;		//清除中断标志位INT SEQ2

		//ADC控制积存器2(ADCCTRL2)的设置
	AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1=0;	//EVA是否启动SEQ1/SEQ转化设置
	AdcRegs.ADCTRL2.bit.EVB_SOC_SEQ=0;	//EVB是否启动级连时的SEQ设置
	AdcRegs.ADCTRL2.bit.EVB_SOC_SEQ2=0;	//EVB是否启动SEQ2设置
	AdcRegs.ADCTRL2.bit.EXT_SOC_SEQ1=0;	//外部输入启动引脚是否启动ADC

	AdcRegs.ADCTRL2.bit.RST_SEQ1=0;		//排序器1复位，复位到CONV0
	AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1=1;	//允许SEQ1中断
	AdcRegs.ADCTRL2.bit.INT_MOD_SEQ1=0;	//SEQ1中断模式设置

	AdcRegs.ADCTRL2.bit.RST_SEQ2=0;		//排序器2复位，复位到CONV8
	AdcRegs.ADCTRL2.bit.INT_ENA_SEQ2=1;	//允许SEQ2中断
	AdcRegs.ADCTRL2.bit.INT_MOD_SEQ2=0;	//SEQ2中断模式设置
	AdcRegs.ADCTRL2.bit.SOC_SEQ2=0;		//SEQ2启动转化

	PieCtrl.PIEIER1.all|=M_INT6;
	IER|=M_INT1;
	while(AdcRegs.ADC_ST_FLAG.bit.SEQ1_BSY==0)			
		AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;		//SEQ1启动转化
}	


//===========================================================================
// No more.
//===========================================================================