main.c

ST10F269 ADC Example

#include <REG168.H>
#include <stdio.h>

#define VREF	5			                  /*  Voltage Reference                            */

void main ( void )  {                     

unsigned char chan_16;

#ifndef MCB167                        /*  do not initialize if you use Monitor-166     */  
  P3  |= 0x0400;                      /*  SET PORT 3.10 OUTPUT LATCH (TXD)             */
  DP3 |= 0x0400;                      /*  SET PORT 3.10 DIRECTION CONTROL (TXD OUTPUT) */
  DP3 &= 0xF7FF;                      /*  RESET PORT 3.11 DIRECTION CONTROL (RXD INPUT)*/
  S0TIC = 0x80;                       /*  SET TRANSMIT INTERRUPT FLAG                  */
  S0RIC = 0x00;                       /*  DELETE RECEIVE INTERRUPT FLAG                */
  S0BG  = 0x40;                       /*  SET BAUDRATE TO 9600 BAUD                    */
  S0CON = 0x8011;                     /*  SET SERIAL MODE                              */
#endif

/* A/D Converter */
                    
chan_16 = 0;                          /*  Init channel selector to 1st channel         */

printf("Test ADC");

while (1){

/* Init ADC	 */
                                      /*  Enable A/D converter,                        */
                                      /*	Fixed Chan. Single Conv., Start on ADBSY set */
  ADCON = 0x0080 | (chan_16 % 16);    /*  and select channels 0-15                     */

  ADBSY = 1;	                        /*  Start ADC conversion						             */
  while (ADBSY);                      /*  Wait for conversion							             */

/* Output 0-1023 ADDAT value without using floating-point */
  //printf ("ADDAT Value %4u, Channel %2d = %01u.%04u Volts\n",
  //       (unsigned) ADDAT & 0x01FF,
  //       (unsigned) ADDAT >> 12,
  //       (unsigned) ((ADDAT & 0x01FF) * VREF) >> 10,                          /* Output Integer Portion */
  //       (unsigned) (((ADDAT & 0x01FF) * VREF * 10000UL) >> 10UL) % 10000);   /* Output Decimal Portion */            

  chan_16++;                          /* Next channel                                 */
  }  
}