wxh用C语言实实现模拟信号到数字信号的转换(经过验证)

#include <string.h> #include "..\..\inc\44b.h" #include "..\..\inc\44blib.h" #include "..\..\inc\cputest\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(); rADCPSR=adcpsr; Uart_Printf("ADC conv. freq.=%d(Hz)\n",(int)(MCLK/(2.*(adcpsr+1.))/16.) ); while(Uart_GetKey()==0) { 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 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 }