simple oscilloscope using Z8F0823 and N3310 LCD

Do-it-yourself simple oscilloscope using Zilog Z8F0823 and Nokia 3310 LCD.

diagram:
demo:


sample "main.c" source code:

 #include <ez8.h>  
 #include "delay.c"  
 #include "lcd3310.c"  
 void erase_column(char x);  
 void lcd_pixel (char x, char y);  
 void lcd_vertical_line (char x, char y1, char y2);  
 void main()  
 {  
      char x, y1, y2, samples[84];  
      //setup ADC  
      PBDD |= 0x01;          // PB0 input direection  
      PBAF |= 0x01;          // PB0 Alernate function on  
      PBAFS1 |= 0x01;          // PB0 analog input  
      ADCCTL1 |= 0x80;     // 2V Vref  
       ADCCTL0 |= 0x10;     // Set ADC Control Register; continuous  
      //initialize 3310 LCD  
      lcd_init();  
      lcd_clear();  
      //display sample alphanumerics  
      lcd_gotoxy(0,1);  
      lcd_puts("DIY scope");  
      lcd_gotoxy(0,2);  
      lcd_puts("Zilog Z8F0823");  
      lcd_gotoxy(0,3);  
      lcd_puts("Nokia 3310 LCD");  
      lcd_gotoxy(0,5);  
      lcd_puts("yus - elab.ph");  
      delay_ms(3000);  
      while(1)  
      {  
           //store samples  
           for(x=0; x<=84; x++)  
           {  
                samples[x] = ADHR;     //read ADC value (high byte)  
                delay_us(100);          //adjust this delay to vary the sampling frequency  
           }  
           //plot samples  
           erase_column(0);  
           for(x=0; x<=84; x++)  
           {  
                erase_column(x+1);  
                y1 = samples[x] / 2.5;          //scale to {0..47} range  
                y1 = 47 - y1;                    //invert position (optional)  
                y2 = samples[x+1] / 2.5;     //scale to {0..47} range  
                y2 = 47 - y2;                    //invert position (optional)  
                //lcd_pixel(x,y1);  
                lcd_vertical_line(x,y1,y2);     //plot  
           }  
           delay_ms(50);  
      }   
 }  
 void erase_column(char x)  
 {  
      char line;  
      if(x>83)     return;  
      for(line=0; line<6; line++)  
      {  
           lcd_gotoxy(x, line);  
           lcd_send(0x00, LCD_TDATA);  
      }  
 }  
 void lcd_pixel (char x, char y)  
 {  
      char data;  
      if ((x > 83) || (y > 47)) return;  
      data = 0x01<<(y%8);  
      lcd_gotoxy(x, (y>>3));  
      lcd_send(data, LCD_TDATA);  
 }  
 void lcd_vertical_line (char x, char y1, char y2)  
 {  
      char i, temp, line1, line2, data;  
      if( (x>83) || (y1>47) || (y2>47) )     return;     //exit if out of range  
      if(y1>y2)  
      {  
           temp = y1;  
           y1 = y2;     //swap variables  
           y2 = temp;  
      }  
      line1 = y1>>3;     //divide by 8  
      line2 = y2>>3;  
      for(i=line1; i<=line2; i++)  
      {  
           data = 0xff;  
           lcd_gotoxy(x,i);  
           if(i==line1)  
           {  
                data = 0;  
                temp = 8 - (y1 % 8);  
                while(temp--)     data |= (0x80>>temp);  
           }  
           if(i==line2)  
           {  
                temp = 7 - (y2 % 8);  
                while(temp--)     data &= ~(0x80>>temp);  
           }  
           lcd_send(data, LCD_TDATA);  
      }  
 }  

complete code and diagram here: N3310 LCD Oscilloscope using Z8F0823.rar