ad1.c

M16C290FC can

/*""FILE COMMENT""****************************************************
 *System Name : CAN DEMO PROGRAM1
 *File Name   : ad1.c
 *Version     : 1.00
 *Contens     : 
 *Customer    : RSO
 *Model       : 
 *Order       : 
 *CPU         : 
 *Compiler    : NC30 Version 5.30 Release 02
 *OS          : 
 *Programmer  : 
 *Note        : 
 *            : 
 **********************************************************************
 * Copyright(C)2005, Renesas Technology Corp.
 * Copyright(C)2005, Renesas Solutions Corp.
 * All rights reserved.
 **********************************************************************
 *History        2005.07.1  Ver 1.00
 *""FILE COMMENT END""************************************************/
 
 #include "sfr29.h"
 #include "define1.h"
 #include "declare1.h"
 
 /*""FUNC COMMENT""****************************************************
  *ID               :3.0
  *Description      :Initialize A/D converter
  *--------------------------------------------------------------------
  *Include          :"sfr29.h"
  *                 :"declare1.h"
  *--------------------------------------------------------------------
  *Declaration      :void ad_initial(void)
  *--------------------------------------------------------------------
  *Function         :Initialize A/D converter
  *--------------------------------------------------------------------
  *Arguments        :Nothing
  *--------------------------------------------------------------------
  *Returns          :Nothing
  *--------------------------------------------------------------------
  *Input            :Nothing
  *Ountput          :Nothing
  *--------------------------------------------------------------------
  *Call functions   :Nothing
  *--------------------------------------------------------------------
  *Note             :
  *--------------------------------------------------------------------
  *History          :
  *                 :
  *""FUNC COMMENT END""***********************************************/
void ad_initial(void)
{
    unsigned short i;
    /* AD initial */
    adcon0 = 0x08;      //fAD/4 (5MHz)
    adcon1 = 0x28;      //
    adcon2 = 0x01;      //
    
    for(i = 0; i < 1000/50; i++);       //wait Vref(1us)
    
    adst = 1;           //start AD
    
    for(i = 0; i < 1000/50; i++);       //wait first AD conversion
}

 /*""FUNC COMMENT""****************************************************
  *ID               :3.1
  *Description      :A/D converter function
  *--------------------------------------------------------------------
  *Include          :"sfr29.h"
  *                 :"declare1.h"
  *--------------------------------------------------------------------
  *Declaration      :void ad_fnc(void)
  *--------------------------------------------------------------------
  *Function         :A/D converter function
  *--------------------------------------------------------------------
  *Arguments        :Nothing
  *--------------------------------------------------------------------
  *Returns          :Nothing
  *--------------------------------------------------------------------
  *Input            :Nothing
  *Ountput          :Nothing
  *--------------------------------------------------------------------
  *Call functions   :ad_read()              ;Read A/D conversion value
  *                 :ad_check()             ;Check A/D conversion value
  *--------------------------------------------------------------------
  *Note             :
  *--------------------------------------------------------------------
  *History          :
  *                 :
  *""FUNC COMMENT END""***********************************************/
void ad_fnc(void)
{
    if(ad_read() != 0){
        if(ad_check() != 0){
            trm_can_ad();
        }
    }
}

 /*""FUNC COMMENT""****************************************************
  *ID               :3.2
  *Description      :Read A/D conversion value
  *--------------------------------------------------------------------
  *Include          :"sfr29.h"
  *                 :"define1.h"
  *                 :"declare1.h"
  *--------------------------------------------------------------------
  *Declaration      :void ad_fnc(void)
  *--------------------------------------------------------------------
  *Function         :Read A/D conversion value
  *--------------------------------------------------------------------
  *Arguments        :Nothing
  *--------------------------------------------------------------------
  *Returns          : Renewal code
  *                 :  0; Not renew "ave_ad_data"
  *                 :  1; Renew "ave_ad_data"
  *--------------------------------------------------------------------
  *Input            :unsigned char count_ad         ;A/D counter
  *                 :unsigned char ad_data[]        ;A/D conversion data
  *Ountput          :unsigned char count_ad         ;A/D counter
  *                 :unsigned short ave_ad_data     ;Average of A/D conversion data
  *                 :unsigned char ad_data[]        ;A/D conversion data
  *--------------------------------------------------------------------
  *Call functions   :Nothing
  *--------------------------------------------------------------------
  *Note             :
  *--------------------------------------------------------------------
  *History          :
  *                 :
  *""FUNC COMMENT END""***********************************************/
unsigned char ad_read(void)
{
    unsigned long in_ad_sum;
    unsigned short i;
    
    ad_data[count_ad] = ad0;
    count_ad++;
    
    if(count_ad >= AD_COUNT){       //Calculate A/D average
        in_ad_sum = 0;
        for(i = 0; i < (sizeof(ad_data) / 2); i++){
            in_ad_sum += ad_data[i];
        }
        ave_ad_data = in_ad_sum / (sizeof(ad_data) / 2);
        count_ad = 0;
        return 1;
    }
    
    return 0;
}

 /*""FUNC COMMENT""****************************************************
  *ID               :3.3
  *Description      :Check A/D conversion value
  *--------------------------------------------------------------------
  *Include          :"sfr29.h"
  *                 :"define1.h"
  *                 :"declare1.h"
  *--------------------------------------------------------------------
  *Declaration      :unsigned char ad_check(void)
  *--------------------------------------------------------------------
  *Function         :Check whether A/D conversion value differ from 
  *                  last A/D conversion value
  *--------------------------------------------------------------------
  *Arguments        :Nothing
  *--------------------------------------------------------------------
  *Returns          : Difference code
  *                 :  0; No difference
  *                 :  1; Differing
  *--------------------------------------------------------------------
  *Input            :unsigned char last_ad_data     ;Last A/D countesion data
  *                 :unsigned char ave_ad_data      ;Average of A/D conversion data
  *Ountput          :unsigned char last_ad_data     ;Last A/D countesion data
  *--------------------------------------------------------------------
  *Call functions   :Nothing
  *--------------------------------------------------------------------
  *Note             :
  *--------------------------------------------------------------------
  *History          :
  *                 :
  *""FUNC COMMENT END""***********************************************/
unsigned char ad_check(void)
{
    union {
        unsigned short word;
        unsigned char byte;
    }in_ad_data,in_last_ad_data;
    
    in_last_ad_data.byte = last_ad_data;
    in_last_ad_data.word = in_last_ad_data.word << 2;
    
    in_ad_data.word = ave_ad_data;
    
    if(in_last_ad_data.word > in_ad_data.word){
        if((in_last_ad_data.word - in_ad_data.word) > 0x0005){
            in_ad_data.word = (in_ad_data.word + 0x0004) >> 2;
            last_ad_data = in_ad_data.byte;
            return 1;
        }
        else if((in_last_ad_data.word == 0x0004) &&
            (in_ad_data.word <= 0x0001)){
//          in_ad_data.word = in_ad_data.word >> 2;
//          last_ad_data = in_ad_data.byte;
            last_ad_data = 0x00;
            return 1;
        }
    }
    else{
        if((in_ad_data.word - in_last_ad_data.word) > 0x0005){
            in_ad_data.word = in_ad_data.word >> 2;
            last_ad_data = in_ad_data.byte;
            return 1;
        }
    }
    
    return 0;
}