VLSI Solution Oy Evaluation MP3 Player Source Code Documentation

display.c

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#include "display.h"
#include "lcd.h"
#include "board.h"
#include "string.h"

volatile xdata char displayPosition;
xdata char displayTitle[16];
xdata char displayText[DS_TEXTLENGTH+1];
xdata char displayLength;
xdata char displayStyle;
xdata char displayValue;



 


char InitDisplay(char style, char *title, char *text, int value){

  LcdReset();

  //Init display title array
  for(displayPosition=0; displayPosition<8; displayPosition++){
    displayTitle[displayPosition]=' ';
  }
  displayTitle[8]=0; //ending zero
  strcpy(displayTitle, title);

  
  displayLength = strlen(text);
  //Init display text array
  //Clear display text array to spaces
  for(displayPosition=0; displayPosition<DS_TEXTLENGTH; displayPosition++){
    displayText[displayPosition]=' ';
  }
  displayText[DS_TEXTLENGTH] = 0; //ending zero
  strcpy(displayText, text);


  displayPosition = 0;
  displayStyle = style;
  displayValue = value;
  LcdPutString(displayTitle);
  LcdLocateLine2();
  LcdPutString(displayText);
  UpdateDisplay();

  return 0;
}


void UpdateDisplay(){

  signed char temp;

  LcdLocateHome();
  LcdPutChar(displayTitle[0]);
  LcdPutChar(displayTitle[1]);
  LcdPutChar(displayTitle[2]);
  LcdPutChar(displayTitle[3]);
  LcdPutChar(displayTitle[4]);
  LcdPutChar(displayTitle[5]);
  LcdPutChar(displayTitle[6]);
  LcdPutChar(displayTitle[7]);
  LcdLocateLine2();
  
  if (displayStyle == DS_STATIC){
    for (temp=0; temp<8; temp++){
      LcdPutChar(displayText[temp]);
    }
  }

  if (displayStyle == DS_TEXT){
    for (temp=displayPosition; temp<displayPosition + 8; temp++){
      if (temp<0){
        LcdPutChar(' ');
      }else{
        if (displayText[temp]){
          LcdPutChar(displayText[temp]);      
        }else{
          LcdPutChar(' ');
        }
      }      
    }
  }

  if (displayStyle == DS_NUMERIC){
    LcdPutUInt(displayValue);
    LcdPutConstantString("        ");
  }

  if (displayStyle == DS_NO_YES){
    LcdPutConstantString(" No<>Yes");
  }

  if (displayStyle == DS_ARROWS){
    LcdPutConstantString(" <-   ->");
  }

  if (displayStyle == DS_PERCENTAGE){
    unsigned char majorp, minorp;
    if (displayValue>100){
      displayValue=100;
    }
    
    majorp = (displayValue-4) / 12;
    minorp = ((displayValue-4) % 12) >> 1;
    for (temp=0; temp<8; temp++){
      if (majorp>temp){
        LcdPutChar(4);
      }else{
        if (majorp<temp){
          LcdPutChar(' ');
        }else{
          switch(minorp){
          case 0:
            LcdPutChar(' ');
            break;
          case 1:
            LcdPutChar(0);
            break;
          case 2:
            LcdPutChar(1);
            break;
          case 3:
            LcdPutChar(2);
            break;
          case 4:
            LcdPutChar(3);
            break;
          case 5:
            LcdPutChar(4);
            break;
          }//switch
        }
      }
    }         
    //LcdPutUInt(displayValue);
    //LcdPutConstantString("%       ");
  }

  if (displayStyle==DS_RAWTEXT){
    LcdPutChar(displayTitle[8]);
    LcdPutChar(displayTitle[9]);
    LcdPutChar(displayTitle[10]);
    LcdPutChar(displayTitle[11]);
    LcdPutChar(displayTitle[12]);
    LcdPutChar(displayTitle[13]);
    LcdPutChar(displayTitle[14]);
    LcdPutChar(displayTitle[15]);
  }


}

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All software copyright 2000-2004 VLSI Solution OY. Redistribution of these software modules are limited to promotional use only and only with the VS1011 / VS1002 / VS1003 MP3-Evakit evaluation boards. Free or commercial use of these software modules in MP3 players is ok if the product includes MP3 decoder chip(s) from VLSI. You can request the complete (compilable) package from mp3@vlsi.fi