adc.c

杭州立宇泰豪华型44B0开发板

#include <string.h>
#include "..\Target\44b.h"
#include "..\Target\44blib.h"
#include "adc.h"

void __irq BDMA1_Done(void);

int ReadAdc(int ch);

void Test_Adc(void)
{
    int a0=0,a1=0,a2=0,a3=0,a4=0,a5=0,a6=0,a7=0;
    int adcpsr;

    Uart_Printf("The ADC_IN are adjusted to the following values.\n");	      
    Uart_Printf("Push any key to exit!!!\n");	 

    rCLKCON=0x7ff8;	
    rADCCON=0x1|(0<<2);		//Enable ADC
    Delay(100);				//delay for 10ms for ADC reference voltage stabilization.

    //Uart_Printf("Input ADCPSR value:");
    //adcpsr=Uart_GetIntNum();
    adcpsr=255;
    rADCPSR=adcpsr;
    Uart_Printf("ADC conv. freq.=%d(Hz)\n",(int)(MCLK/(2.*(adcpsr+1.))/16.) );
    
    while(Uart_GetKey()==0)
    {
	SoftDelay(10000);
	a0=ReadAdc(0);
	a1=ReadAdc(1);
	a2=ReadAdc(2);
	//a3=ReadAdc(3);
	//a4=ReadAdc(4);
	//a5=ReadAdc(5);
	//a6=ReadAdc(6);
	//a7=ReadAdc(7);
	
	Uart_Printf("0:%04d 1:%04d 2:%04d \n",/*3:%04d 4:%04d 5:%04d 6:%04d 7:%04d\n",*/
		a0,a1,a2,a3,a4,a5,a6,a7);
    }
}

int ReadAdc(int ch)
{
    int i;
    static int prevCh=-1;

    if(prevCh!=ch)
    {
    	rADCCON=0x0|(ch<<2);	//setup channel.
    	for(i=0;i<150;i++);	//min. 15us
    }
    rADCCON=0x1|(ch<<2);	//Start A/D conversion
    while(rADCCON &0x1);	//To avoid The first FLAG error case.
				//(The START bit is cleared in one ADC clock.)
    while(!(rADCCON & 0x40));
    for(i=0;i<rADCPSR;i++); 	//To avoid The second FLAG error case
    prevCh=ch;
    return rADCDAT;
}

volatile char end_test;

void Test_DMA_Adc(void)
{
    unsigned int *dst, *temp,i;
    end_test=0;

    pISR_BDMA1=(unsigned)BDMA1_Done;
    rINTMSK=~(BIT_GLOBAL|BIT_BDMA1);
	
    Uart_Printf("Test of the 'Start by read' in ADC block.\n");
    Uart_Printf("Change the value of AIN0\n");

//    rCLKCON=0x7ff8;
    dst=(unsigned int *)malloc(0x100);
    rNCACHBE0= ((int)dst>>12) + ( (((int)dst>>12) +1)<<16 );

    temp=dst;

    /***ADC init***/
    rADCCON=0x2;	//normal,AIN0,enable start by read
    rADCPSR=0x4;	// MCLK/2

    /***BDMA1 init***/
    rBDISRC1=(2<<30)+(3<<28)+0x1d40008;		//word,peri.(ADC)
    rBDIDES1=(2<<30)+(1<<28)+(unsigned)dst;	//IO2M,++
    rBDICNT1=(1<<30)+(1<<26)+(3<<22)+(0<<20)+10*4;//timer,unit,end->interrupt,disable,count=10(word) 
    rBDICNT1 |= (1<<20);//enable
    rBDCON1 = 0x0;
	
    /***Timer0 init***/
    rTCFG0=255;		//prescaler0=255
    rTCFG1=(1<<24)+4;	//Timer0 DMA, div=32 
    rTCNTB0=4902;	//(1/(40MHz/255/32))*4902=1.xx s
    rTCON=0xa;		//auto, update

    rTCON=0x9;		//Start 

    while(!end_test);
    
    Uart_Printf("dst=0x%x,temp=0x%x\n",dst,temp);
    for(i=0;i<10;i++)
	Uart_Printf("%d=0x%03x\n",i,*temp++);
    Uart_Printf("dst=0x%x,temp=0x%x\n",dst,temp);

    free(dst);
    rINTMSK=BIT_GLOBAL;
}

void __irq BDMA1_Done(void)
{
    rI_ISPC=BIT_BDMA1;  //clear pending bit
    rTCON=0x0;		//Stop
    end_test=1;		//set end flag
}