main.c

MC9S08QG8 Quick Start Examples,含ADC.C,KBI.GPIO.C等7个例程.

/*******************************************************************
**  Filename    : main.c
**  Project     : acmp example
**  Processor   : MC9S08QG8
**  Version     : $v
**  Location    : h:\projects\freescale\acmp\
**  Author      : Jim McLean
**  Company     : Highlander Technologies
**  Date        : 10/26/2005, 12:13 AM
**  Compiler    : Metrowerks CodeWarrior HC08 C Compiler
**  Notes       : HC9S08QG Quick Start Example
**              : This example can be used on the DEMO9S08QG8 board
**
*******************************************************************/

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC9S08QG8.h> /* include peripheral declarations */


void main(void) 
{

  ACMPSC_ACMOD = 1;   // 1 = interrupt on rising edge of comparator output 
  ACMPSC_ACOPE = 0;   // 0 = comparator output disabled on external pin
  //SOPT1_BKGDPE = 0; // disable bgdb mode on ACMPO pin if using pin for compare output
  ACMPSC_ACIE = 1;    // 1 = comparator interrupt enabled
  ACMPSC_ACBGS = 1;   // 1 = use internal reference on ACMP+
  SPMSC1_BGBE = 1;    // 1 = enable bandgap buffer for internal reference
  ACMPSC_ACME = 1;    // 1 = comparator enabled
  ACMPSC_ACF = 1;     // writing 1 clears compare event flag


// set up an output port as an indicator
  PTBDD_PTBDD7 = 1;   //set PTB.7 as an output, LED2 on demo board
  PTBD_PTBD7 = 0;

  EnableInterrupts; /* enable interrupts */


  for(;;) 
  {
    __RESET_WATCHDOG();
  }// wait here 


}// end main



//ACMP ISR
interrupt 20 void   ACMP_ISR(void) 
  {
  PTBD_PTBD7 = ~PTBD_PTBD7;   // toggle PTB.7 pin on compare event
  ACMPSC_ACF = 1;             // writing 1 clears event flag
  }