main.c

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

/*******************************************************************
**  Filename    : main.c
**  Project     : adc compare example
**  Processor   : MC9S08QG8
**  Version     : $v
**  Location    : h:\projects\freescale\adc comp\
**  Author      : Jim McLean
**  Company     : Highlander Technologies
**  Date        : 11/04/2005, 8:33 AM :)
**  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 */

int ADC_val_H;
int ADC_val_L;


void main(void) 
{

// set up adc
  ADCSC1_ADCH = 0x1f; // all channels selected disables the ADC during config

  ADCCFG_ADICLK = 0; 	// clock source, 00=bus clock, 11 = async. clock 
  ADCCFG_MODE = 0b10; // conversion mode, 00 = 8 bit, 10 = 10 bit mode
  ADCCFG_ADLSMP = 1; 	// sample time, 1 = long sample time
  ADCCFG_ADIV = 1; 	  // clock divide, 1 = input clock/2
  ADCCFG_ADLPC = 1; 	// low power config, 1 = low power
  

  ADCSC2_ADTRG = 0;   // trigger select, 0 = software trigger
  ADCSC2_ACFE = 1;    // compare function, 1 = enable compare function
  ADCSC2_ACFGT = 1;   // 1 = compare function greater than
  
  ADCSC1_ADCO = 1;    // enable single conversion, 1 is continuous conversion
  ADCSC1_AIEN = 1;    // enable ADC interrupt

  APCTL1_ADPC0 = 1;   // disable I/O control on pin
    
  ADCCVL = 0x80;      // set a compare value
  ADCCVH = 0x01;      // set a compare value

// set up output port for an indicator
  PTBDD_PTBDD7 = 1;   //set PTB.7 as an output
  PTBD_PTBD7 = 0;

// set up kbi
  PTAPE_PTAPE2 = 1;   // enable pullup for kb2
  KBIPE_KBIPE2 =1;    // enable kb 2
  KBISC_KBACK = 1;    // clear kb interrupts
  KBISC_KBIE = 1;     // enable kbi interrupts


  EnableInterrupts;   // enable interrupts 


  for(;;) {
    __RESET_WATCHDOG(); /* feeds the dog */
  } /* loop forever */


}// end main



//KBI ISR
// the key interrupt is used to start and ADC conversion
// and enter wait mode until the Input > Compare value
interrupt 18 void   KBI_ISR(void) 
  {
  KBISC_KBACK = 1;  // clear kb interrupt
  ADCSC1_ADCH = 0;
  }


interrupt 19 void ADC_ISR(void) 
  {
  ADC_val_H = ADCRH;
  ADC_val_L = ADCRL;
  PTBD_PTBD7 = ~PTBD_PTBD7;   // toggle PTB.7 pin
  ADCSC1_ADCH = 0x1f; // disable the ADC  
  }