adc.c

USB是主从总线

/******************************************************************************/
/*  This file is part of the uVision/ARM development tools                    */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2005                                  */
/******************************************************************************/
/*                                                                            */
/*  ADC.c:  ADC Example                                                       */
/*                                                                            */
/******************************************************************************/

#include <ADuC7026.H>               // ADuC7026 definitions

#define CLOCK   22544384            // CPU configured for 22.544384 MHz clock
#define T0_FREQ     5000            // Timer 0 Reload Frequency

#define T0_LD   ((unsigned short)(CLOCK/16 / T0_FREQ))

int ADC_samples[16];


extern volatile int T0_Tick;        // Timer 0 Current Tick Value
                int T0_Last;        // Timer 0 Last Tick Value

int main (void) {
  int i;

  ADCCON = 0x23;                   // Configure DAC1 (LED) Range 0..VDD
  ADCCN  = 0x10;				   // Set the negative ADC input to "reference" (ground)

  while (1) {                       // Loop forever
    for(i = 1; i < 16; i++)
	{
      ADCCP = i;					// Set the MUX to read the next input
      ADCCON |= 0x80;				// Start the conversion
	  while(ADCSTA);				// Wait until the converstion finishes

	  ADC_samples[i] = (ADCDAT >> 0x10)&0x0FFF;

      ADCCP = 0;					// Sample ADC0 every time
      ADCCON |= 0x80;				// Start the conversion
	  while(ADCSTA);				// Wait until the converstion finishes

	  ADC_samples[0] = (ADCDAT >> 0x10)&0x0FFF;
    }
  }
}