Powertip PC1604A

Danke funzt auch ein 100k ohm Poti zwischen Betriebsspannung und masse?

Habe folgenden Code geschrieben für PIC18F4550 in C

...Konfigurationen für PIC(alle schon einmal getestet!)

#include "p18f4550.h"
#include "delays.h"

#define LCD_RS   LATBbits.LATB2
#define LCD_EN   LATBbits.LATB3
#define LCD_D4   LATBbits.LATB4
#define LCD_D5   LATBbits.LATB5
#define LCD_D6   LATBbits.LATB6
#define LCD_D7   LATBbits.LATB7

#define LCD_RS_Dir  TRISBbits.TRISB2
#define LCD_EN_Dir  TRISBbits.TRISB3
#define LCD_D4_Dir  TRISBbits.TRISB4
#define LCD_D5_Dir  TRISBbits.TRISB5
#define LCD_D6_Dir  TRISBbits.TRISB6
#define LCD_D7_Dir  TRISBbits.TRISB7

#define Enable Delay10TCYx(1); LCD_EN=1; Delay10TCYx(1); LCD_EN=0; 
Delay10TCYx(1);

void LCD_Init(void);
void LCD_Send(unsigned char chr);
void LCD_DDRAM_Addr(unsigned char addr);
void LCD_CGRAM_Addr(unsigned char addr);
void LCD_Char(unsigned char row, unsigned char column, unsigned char 
text);
void LCD_Text(unsigned char row, unsigned char column, unsigned char 
*text);
void LCD_Gen_Char(unsigned char number, unsigned char *code);


void OSC_Init(void)
{
  OSCCONbits.IRCF2 = 1;
  OSCCONbits.IRCF1 = 1;
  OSCCONbits.IRCF0 = 0;
}

void Ports_Init(void)
{
  LATB = 0x00;
  TRISB = 0x00;        // Alles Ausgänge


}

unsigned char txt[]="Hallo Welt";
unsigned char smilie[] = {0,10,0,4,4,17,14,0};
unsigned char i;

void main (void)
{ int i;

  OSC_Init();
  Ports_Init();
  LCD_Init();

  LCD_Text(1,1,txt);
  LCD_Text(2,1,txt);
  LCD_Text(3,1,txt);
  LCD_Text(4,1,txt);


  LCD_Gen_Char(0, smilie);
  LCD_Char(1,13,0x00);

  while(1);
}

void LCD_Init(void)
{
  LCD_RS_Dir=0;    //Set Pins to Outpur
  LCD_EN_Dir=0;
  LCD_D4_Dir=0;
  LCD_D5_Dir=0;
  LCD_D6_Dir=0;
  LCD_D7_Dir=0;

  Delay10KTCYx(20);  //Delay 40ms

  LCD_RS=0;

  LCD_D7=0;      //Function Set 8-bit
  LCD_D6=0;
  LCD_D5=1;
  LCD_D4=1;
  Enable
  Delay10KTCYx(21);  //Delay ca. 4.2ms

  LCD_D7=0;      //Function Set 8-bit
  LCD_D6=0;
  LCD_D5=1;
  LCD_D4=1;
  Enable
  Delay10TCYx(50);  //Delay ca. 100us

  LCD_D7=0;       //Function Set 8-bit
  LCD_D6=0;
  LCD_D5=1;
  LCD_D4=1;
  Enable
  Delay10TCYx(19);  //Delay ca. 38us

  LCD_D7=0;       //Function Set 4-bit
  LCD_D6=0;
  LCD_D5=1;
  LCD_D4=0;
  Enable
  Delay10TCYx(19);  //Delay ca. 38us

  LCD_D7=0;       //Function Set
  LCD_D6=0;
  LCD_D5=1;
  LCD_D4=0;      //DL=0
  Enable
  LCD_D7=1;       //N = 1
  LCD_D6=0;      //F = 0
  LCD_D5=0;      //x
  LCD_D4=0;      //x
  Enable
  Delay10TCYx(19);  //Delay ca. 38us

  LCD_D7=0;       //Display ON/OFF
  LCD_D6=0;
  LCD_D5=0;
  LCD_D4=0;
  Enable
  LCD_D7=1;
  LCD_D6=1;      //D=1  (D=1:Display ON)
  LCD_D5=0;      //C=0  (C=1:Under-line cursor ON)
  LCD_D4=0;      //B=0  (B=1:Block cursor ON)
  Enable
  Delay10TCYx(19);  //Delay ca. 38us

  LCD_D7=0;       //Clear Display
  LCD_D6=0;
  LCD_D5=0;
  LCD_D4=0;
  Enable
  LCD_D7=0;
  LCD_D6=0;
  LCD_D5=0;
  LCD_D4=1;
  Enable
  Delay100TCYx(80);  //Delay ca. 1.6ms

  LCD_D7=0;       //Entry Mode
  LCD_D6=0;
  LCD_D5=0;
  LCD_D4=0;
  Enable
  LCD_D7=0;
  LCD_D6=1;
  LCD_D5=1;      //ID = 1
  LCD_D4=0;      //S = 0
  Enable
  Delay100TCYx(19);  //Delay ca. 38us

  LCD_DDRAM_Addr(0x00);

}

void LCD_Send(unsigned char chr)
{
  LCD_D7=(chr&0b10000000) ? 1:0;
  LCD_D6=(chr&0b01000000) ? 1:0;
  LCD_D5=(chr&0b00100000) ? 1:0;
  LCD_D4=(chr&0b00010000) ? 1:0;
  Enable
  LCD_D7=(chr&0b00001000) ? 1:0;
  LCD_D6=(chr&0b00000100) ? 1:0;
  LCD_D5=(chr&0b00000010) ? 1:0;
  LCD_D4=chr&0x01;
  Enable
  Delay10TCYx(20);  //Delay ca. 38us
}

void LCD_DDRAM_Addr(unsigned char addr)
{
  LCD_RS=0;
  LCD_Send(addr|0x80);
}

void LCD_CGRAM_Addr(unsigned char addr)
{
  LCD_RS=0;
  LCD_Send((addr&0x3F)|0x40);
}

void LCD_Char(unsigned char row, unsigned char column, unsigned char 
text)
{
  column--;
  if(row==2)
  {
    column=column+0x40;
  }
  if(row==3)
  {
    column=column+0x14;
  }
  if(row==4)
  {
    column=column+0x54;
  }

  LCD_DDRAM_Addr(column);
  LCD_RS=1;
    LCD_Send(text);
}

void LCD_Text(unsigned char row, unsigned char column, unsigned char * 
text)
{
  unsigned char counter;
  LCD_Char(row, column, text[0]);

    for(counter=1; text[counter]; counter++)
  {
      LCD_Send(text[counter]);
    }
}

void LCD_Gen_Char(unsigned char number, unsigned char *code)
{
  unsigned char i;
  LCD_RS=0;
  number=number<<3;
  LCD_CGRAM_Addr(number);
  LCD_RS=1;
  for(i=0;i<8;i++)
  {
    LCD_Send(code[i]);
  }
}


funzt aber nicht habe alle Verbindungen richtig angeschlossen mit 
Spannungsversorgung

Für Kontrastspannung habe ich ein 100k ohm Poti zwischen Plus und Masse 
genommen habe daran rumgedereht aber funzt trotzdem nicht!