LCD-Library stört PWM-Pin

Ich verwende am ATmega48 einen PWM-Kanal (OC0A an PD6) doch sobald ich in der Software die LCD-Library von P. Fleury verwende, funktioniert dieser Pin nicht mehr richtig, d.h. das PWM-Signal ist nichtmehr vorhanden. Am Oszilloskop sieht man nur ein Rechtecksignal bei um die 0,2V, was aber von der Form her scheinbar nichts mit dem PWM-Signal zu tun hat.

Eigentlich dürfte dieser Pin PD6 nicht für das LCD verwendet werden, denn der entsprechende Abschnitt in lcd.h sieht so aus:

Code:

---

#define LCD_PORT        PORTB        /**< port for the LCD lines  */
#define LCD_DATA0_PORT  PORTB    /**< port for 4bit data bit 0 */
#define LCD_DATA1_PORT  PORTB    /**< port for 4bit data bit 1 */
#define LCD_DATA2_PORT  PORTD    /**< port for 4bit data bit 2 */
#define LCD_DATA3_PORT  PORTC    /**< port for 4bit data bit 3 */
#define LCD_DATA0_PIN    7            /**< pin for 4bit data bit 0  */
#define LCD_DATA1_PIN    6            /**< pin for 4bit data bit 1  */
#define LCD_DATA2_PIN    7            /**< pin for 4bit data bit 2  */
#define LCD_DATA3_PIN    3            /**< pin for 4bit data bit 3  */
#define LCD_RS_PORT      PORTB    /**< port for RS line        */
#define LCD_RS_PIN      4            /**< pin  for RS line        */
#define LCD_RW_PORT      PORTB    /**< port for RW line        */
#define LCD_RW_PIN      5            /**< pin  for RW line        */
#define LCD_E_PORT      PORTB    /**< port for Enable line    */
#define LCD_E_PIN        0            /**< pin  for Enable line    */

---

Ich schreib nochmal meinen Code dazu, falls der relevant ist:

Code:

---

#include <avr/io.h>
#include "lcdlibrary/lcd.h"
#include <util/delay.h>

#define SAUGER_PORT PORTD
#define SAUGER_PIN PD6

void Sauger(int Geschwindigkeit)
{
    OCR0A = Geschwindigkeit;
};
void PWM_Init (void)
{
    DDRD |= (1<<PD6);
    //Fast-PWM-Mode, Clear on CompareMatch, Set on Bottom, Clk/8
    TCCR0A |= (1<<COM0A1) | (1<<WGM00) | (1<<WGM01);
    TCCR0A &= ~(1<<COM0A0);
    TCCR0B |= (1<<CS01);
    TCCR0B &= ~((1<<WGM02) | (1<<FOC0A) | (1<<FOC0B) | (1<<CS00) | (1<<CS02));

    //Compare-Wert
    OCR0A = 0x0;
};
void Init (void)
{
    lcd_init(LCD_DISP_ON);
    lcd_clrscr();
    PWM_Init();
};

int main (void)
{
    Init();
    lcd_puts("Staubsaugerroboter");
    Sauger(128);
      while (1)
      {   
      }
};

---

Sobald ich aus obigem Code lcd_init(), lcd_clrscr() und lcd_puts() herausnehme, ist das PWM-Signal wieder richtig da.
Kann mir da jemand auf die Sprünge helfen?

Die P. Fleury-Lib verwende ich nicht. Was steht denn in lcd_init(), lcd_clrscr() und lcd_puts()? Vielleicht fummeln diese Funktionen an dem DDR des PD6.

Hier einfach mal die lcd.c (die Funktionen hab ich markiert):

Code:

---

/****************************************************************************
 Title    :  HD44780U LCD library
 Author:    Peter Fleury <pfleury@gmx.ch>  http://jump.to/fleury
 File:        $Id: lcd.c,v 1.14.2.1 2006/01/29 12:16:41 peter Exp $
 Software:  AVR-GCC 3.3
 Target:    any AVR device, memory mapped mode only for AT90S4414/8515/Mega

 DESCRIPTION
      Basic routines for interfacing a HD44780U-based text lcd display

      Originally based on Volker Oth's lcd library,
      changed lcd_init(), added additional constants for lcd_command(),
      added 4-bit I/O mode, improved and optimized code.

      Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
      4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
     
      Memory mapped mode compatible with Kanda STK200, but supports also
      generation of R/W signal through A8 address line.

 USAGE
      See the C include lcd.h file for a description of each function
     
*****************************************************************************/
#include <inttypes.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include "lcd.h"



/*
** constants/macros
*/
#define DDR(x) (*(&x - 1))      /* address of data direction register of port x */
#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
    /* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
    #define PIN(x) ( &PORTF==&(x) ? _SFR_IO8(0x00) : (*(&x - 2)) )
#else
    #define PIN(x) (*(&x - 2))    /* address of input register of port x          */
#endif


#if LCD_IO_MODE
#define lcd_e_delay()  __asm__ __volatile__( "rjmp 1f\n 1:" );
#define lcd_e_high()    LCD_E_PORT  |=  _BV(LCD_E_PIN);
#define lcd_e_low()    LCD_E_PORT  &= ~_BV(LCD_E_PIN);
#define lcd_e_toggle()  toggle_e()
#define lcd_rw_high()  LCD_RW_PORT |=  _BV(LCD_RW_PIN)
#define lcd_rw_low()    LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
#define lcd_rs_high()  LCD_RS_PORT |=  _BV(LCD_RS_PIN)
#define lcd_rs_low()    LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
#endif

#if LCD_IO_MODE
#if LCD_LINES==1
#define LCD_FUNCTION_DEFAULT    LCD_FUNCTION_4BIT_1LINE
#else
#define LCD_FUNCTION_DEFAULT    LCD_FUNCTION_4BIT_2LINES
#endif
#else
#if LCD_LINES==1
#define LCD_FUNCTION_DEFAULT    LCD_FUNCTION_8BIT_1LINE
#else
#define LCD_FUNCTION_DEFAULT    LCD_FUNCTION_8BIT_2LINES
#endif
#endif

#if LCD_CONTROLLER_KS0073
#if LCD_LINES==4

#define KS0073_EXTENDED_FUNCTION_REGISTER_ON  0x24  /* |0|010|0100 4-bit mode extension-bit RE = 1 */
#define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x20  /* |0|000|1001 4 lines mode */
#define KS0073_4LINES_MODE                    0x09  /* |0|001|0000 4-bit mode, extension-bit RE = 0 */

#endif
#endif

/*
** function prototypes
*/
#if LCD_IO_MODE
static void toggle_e(void);
#endif

/*
** local functions
*/



/*************************************************************************
 delay loop for small accurate delays: 16-bit counter, 4 cycles/loop
*************************************************************************/
static inline void _delayFourCycles(unsigned int __count)
{
    if ( __count == 0 )   
        __asm__ __volatile__( "rjmp 1f\n 1:" );    // 2 cycles
    else
        __asm__ __volatile__ (
            "1: sbiw %0,1" "\n\t"                 
            "brne 1b"                              // 4 cycles/loop
            : "=w" (__count)
            : "0" (__count)
          );
}


/*************************************************************************
delay for a minimum of <us> microseconds
the number of loops is calculated at compile-time from MCU clock frequency
*************************************************************************/
#define delay(us)  _delayFourCycles( ( ( 1*(XTAL/4000) )*us)/1000 )


#if LCD_IO_MODE
/* toggle Enable Pin to initiate write */
static void toggle_e(void)
{
    lcd_e_high();
    lcd_e_delay();
    lcd_e_low();
}
#endif


/*************************************************************************
Low-level function to write byte to LCD controller
Input:    data  byte to write to LCD
          rs    1: write data   
                0: write instruction
Returns:  none
*************************************************************************/
#if LCD_IO_MODE
static void lcd_write(uint8_t data,uint8_t rs)
{
    unsigned char dataBits ;


    if (rs) {  /* write data        (RS=1, RW=0) */
      lcd_rs_high();
    } else {    /* write instruction (RS=0, RW=0) */
      lcd_rs_low();
    }
    lcd_rw_low();

    if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
      && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
    {
        /* configure data pins as output */
        DDR(LCD_DATA0_PORT) |= 0x0F;

        /* output high nibble first */
        dataBits = LCD_DATA0_PORT & 0xF0;
        LCD_DATA0_PORT = dataBits |((data>>4)&0x0F);
        lcd_e_toggle();

        /* output low nibble */
        LCD_DATA0_PORT = dataBits | (data&0x0F);
        lcd_e_toggle();

        /* all data pins high (inactive) */
        LCD_DATA0_PORT = dataBits | 0x0F;
    }
    else
    {
        /* configure data pins as output */
        DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
        DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
        DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
        DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
       
        /* output high nibble first */
        LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
        LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
        LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
        LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
        if(data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
        if(data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
        if(data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
        if(data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); 
        lcd_e_toggle();
       
        /* output low nibble */
        LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
        LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
        LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
        LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
        if(data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
        if(data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
        if(data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
        if(data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
        lcd_e_toggle();       
       
        /* all data pins high (inactive) */
        LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
        LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
        LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
        LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
    }
}
#else
#define lcd_write(d,rs) if (rs) *(volatile uint8_t*)(LCD_IO_DATA) = d; else *(volatile uint8_t*)(LCD_IO_FUNCTION) = d;
/* rs==0 -> write instruction to LCD_IO_FUNCTION */
/* rs==1 -> write data to LCD_IO_DATA */
#endif


/*************************************************************************
Low-level function to read byte from LCD controller
Input:    rs    1: read data   
                0: read busy flag / address counter
Returns:  byte read from LCD controller
*************************************************************************/
#if LCD_IO_MODE
static uint8_t lcd_read(uint8_t rs)
{
    uint8_t data;
   
   
    if (rs)
        lcd_rs_high();                      /* RS=1: read data      */
    else
        lcd_rs_low();                        /* RS=0: read busy flag */
    lcd_rw_high();                          /* RW=1  read mode      */
   
    if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
      && ( LCD_DATA0_PIN == 0 )&& (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
    {
        DDR(LCD_DATA0_PORT) &= 0xF0;        /* configure data pins as input */
       
        lcd_e_high();
        lcd_e_delay();       
        data = PIN(LCD_DATA0_PORT) << 4;    /* read high nibble first */
        lcd_e_low();
       
        lcd_e_delay();                      /* Enable 500ns low      */
       
        lcd_e_high();
        lcd_e_delay();
        data |= PIN(LCD_DATA0_PORT)&0x0F;    /* read low nibble        */
        lcd_e_low();
    }
    else
    {
        /* configure data pins as input */
        DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
        DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
        DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
        DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
               
        /* read high nibble first */
        lcd_e_high();
        lcd_e_delay();       
        data = 0;
        if ( PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN) ) data |= 0x10;
        if ( PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN) ) data |= 0x20;
        if ( PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN) ) data |= 0x40;
        if ( PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN) ) data |= 0x80;
        lcd_e_low();

        lcd_e_delay();                      /* Enable 500ns low      */
   
        /* read low nibble */   
        lcd_e_high();
        lcd_e_delay();
        if ( PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN) ) data |= 0x01;
        if ( PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN) ) data |= 0x02;
        if ( PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN) ) data |= 0x04;
        if ( PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN) ) data |= 0x08;       
        lcd_e_low();
    }
    return data;
}
#else
#define lcd_read(rs) (rs) ? *(volatile uint8_t*)(LCD_IO_DATA+LCD_IO_READ) : *(volatile uint8_t*)(LCD_IO_FUNCTION+LCD_IO_READ)
/* rs==0 -> read instruction from LCD_IO_FUNCTION */
/* rs==1 -> read data from LCD_IO_DATA */
#endif


/*************************************************************************
loops while lcd is busy, returns address counter
*************************************************************************/
static uint8_t lcd_waitbusy(void)

{
    register uint8_t c;
   
    /* wait until busy flag is cleared */
    while ( (c=lcd_read(0)) & (1<<LCD_BUSY)) {}
   
    /* the address counter is updated 4us after the busy flag is cleared */
    delay(2);

    /* now read the address counter */
    return (lcd_read(0));  // return address counter
   
}/* lcd_waitbusy */


/*************************************************************************
Move cursor to the start of next line or to the first line if the cursor
is already on the last line.
*************************************************************************/
static inline void lcd_newline(uint8_t pos)
{
    register uint8_t addressCounter;


#if LCD_LINES==1
    addressCounter = 0;
#endif
#if LCD_LINES==2
    if ( pos < (LCD_START_LINE2) )
        addressCounter = LCD_START_LINE2;
    else
        addressCounter = LCD_START_LINE1;
#endif
#if LCD_LINES==4
#if KS0073_4LINES_MODE
    if ( pos < LCD_START_LINE2 )
        addressCounter = LCD_START_LINE2;
    else if ( (pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3) )
        addressCounter = LCD_START_LINE3;
    else if ( (pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4) )
        addressCounter = LCD_START_LINE4;
    else
        addressCounter = LCD_START_LINE1;
#else
    if ( pos < LCD_START_LINE3 )
        addressCounter = LCD_START_LINE2;
    else if ( (pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4) )
        addressCounter = LCD_START_LINE3;
    else if ( (pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2) )
        addressCounter = LCD_START_LINE4;
    else
        addressCounter = LCD_START_LINE1;
#endif
#endif
    lcd_command((1<<LCD_DDRAM)+addressCounter);

}/* lcd_newline */


/*
** PUBLIC FUNCTIONS
*/

/*************************************************************************
Send LCD controller instruction command
Input:  instruction to send to LCD controller, see HD44780 data sheet
Returns: none
*************************************************************************/
void lcd_command(uint8_t cmd)
{
    lcd_waitbusy();
    lcd_write(cmd,0);
}


/*************************************************************************
Send data byte to LCD controller
Input:  data to send to LCD controller, see HD44780 data sheet
Returns: none
*************************************************************************/
void lcd_data(uint8_t data)
{
    lcd_waitbusy();
    lcd_write(data,1);
}



/*************************************************************************
Set cursor to specified position
Input:    x  horizontal position  (0: left most position)
          y  vertical position    (0: first line)
Returns:  none
*************************************************************************/
void lcd_gotoxy(uint8_t x, uint8_t y)
{
#if LCD_LINES==1
    lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
#endif
#if LCD_LINES==2
    if ( y==0 )
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
    else
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
#endif
#if LCD_LINES==4
    if ( y==0 )
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
    else if ( y==1)
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
    else if ( y==2)
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE3+x);
    else /* y==3 */
        lcd_command((1<<LCD_DDRAM)+LCD_START_LINE4+x);
#endif

}/* lcd_gotoxy */


/*************************************************************************
*************************************************************************/
int lcd_getxy(void)
{
    return lcd_waitbusy();
}


/*************************************************************************
Clear display and set cursor to home position
*************************************************************************/
void lcd_clrscr(void)
{
    lcd_command(1<<LCD_CLR);
}


/*************************************************************************
Set cursor to home position
*************************************************************************/
void lcd_home(void)
{
    lcd_command(1<<LCD_HOME);
}


/*************************************************************************
Display character at current cursor position
Input:    character to be displayed                                     
Returns:  none
*************************************************************************/
void lcd_putc(char c)
{
    uint8_t pos;


    pos = lcd_waitbusy();  // read busy-flag and address counter
    if (c=='\n')
    {
        lcd_newline(pos);
    }
    else
    {
#if LCD_WRAP_LINES==1
#if LCD_LINES==1
        if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
        }
#elif LCD_LINES==2
        if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);   
        }else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ){
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
        }
#elif LCD_LINES==4
        if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);   
        }else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE3,0);
        }else if ( pos == LCD_START_LINE3+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE4,0);
        }else if ( pos == LCD_START_LINE4+LCD_DISP_LENGTH ) {
            lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
        }
#endif
        lcd_waitbusy();
#endif
        lcd_write(c, 1);
    }

}/* lcd_putc */


/*************************************************************************
Display string without auto linefeed
Input:    string to be displayed
Returns:  none
*************************************************************************/
void lcd_puts(const char *s)
/* print string on lcd (no auto linefeed) */
{
    register char c;

    while ( (c = *s++) ) {
        lcd_putc(c);
    }

}/* lcd_puts */


/*************************************************************************
Display string from program memory without auto linefeed
Input:    string from program memory be be displayed                                       
Returns:  none
*************************************************************************/
void lcd_puts_p(const char *progmem_s)
/* print string from program memory on lcd (no auto linefeed) */
{
    register char c;

    while ( (c = pgm_read_byte(progmem_s++)) ) {
        lcd_putc(c);
    }

}/* lcd_puts_p */


/*************************************************************************
Initialize display and select type of cursor
Input:    dispAttr LCD_DISP_OFF            display off
                  LCD_DISP_ON            display on, cursor off
                  LCD_DISP_ON_CURSOR      display on, cursor on
                  LCD_DISP_CURSOR_BLINK  display on, cursor on flashing
Returns:  none
*************************************************************************/
void lcd_init(uint8_t dispAttr)
{
#if LCD_IO_MODE
    /*
    *  Initialize LCD to 4 bit I/O mode
    */
   
    if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
      && ( &LCD_RS_PORT == &LCD_DATA0_PORT) && ( &LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT)
      && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)
      && (LCD_RS_PIN == 4 ) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6 ) )
    {
        /* configure all port bits as output (all LCD lines on same port) */
        DDR(LCD_DATA0_PORT) |= 0x7F;
    }
    else if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
          && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
    {
        /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
        DDR(LCD_DATA0_PORT) |= 0x0F;
        DDR(LCD_RS_PORT)    |= _BV(LCD_RS_PIN);
        DDR(LCD_RW_PORT)    |= _BV(LCD_RW_PIN);
        DDR(LCD_E_PORT)    |= _BV(LCD_E_PIN);
    }
    else
    {
        /* configure all port bits as output (LCD data and control lines on different ports */
        DDR(LCD_RS_PORT)    |= _BV(LCD_RS_PIN);
        DDR(LCD_RW_PORT)    |= _BV(LCD_RW_PIN);
        DDR(LCD_E_PORT)    |= _BV(LCD_E_PIN);
        DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
        DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
        DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
        DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
    }
    delay(16000);        /* wait 16ms or more after power-on      */
   
    /* initial write to lcd is 8bit */
    LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);  // _BV(LCD_FUNCTION)>>4;
    LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);  // _BV(LCD_FUNCTION_8BIT)>>4;
    lcd_e_toggle();
    delay(4992);        /* delay, busy flag can't be checked here */
 
    /* repeat last command */
    lcd_e_toggle();     
    delay(64);          /* delay, busy flag can't be checked here */
   
    /* repeat last command a third time */
    lcd_e_toggle();     
    delay(64);          /* delay, busy flag can't be checked here */

    /* now configure for 4bit mode */
    LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);  // LCD_FUNCTION_4BIT_1LINE>>4
    lcd_e_toggle();
    delay(64);          /* some displays need this additional delay */
   
    /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */   
#else
    /*
    * Initialize LCD to 8 bit memory mapped mode
    */
   
    /* enable external SRAM (memory mapped lcd) and one wait state */       
    MCUCR = _BV(SRE) | _BV(SRW);

    /* reset LCD */
    delay(16000);                          /* wait 16ms after power-on    */
    lcd_write(LCD_FUNCTION_8BIT_1LINE,0);  /* function set: 8bit interface */                 
    delay(4992);                            /* wait 5ms                    */
    lcd_write(LCD_FUNCTION_8BIT_1LINE,0);  /* function set: 8bit interface */               
    delay(64);                              /* wait 64us                    */
    lcd_write(LCD_FUNCTION_8BIT_1LINE,0);  /* function set: 8bit interface */               
    delay(64);                              /* wait 64us                    */
#endif

#if KS0073_4LINES_MODE
    /* Display with KS0073 controller requires special commands for enabling 4 line mode */
    lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
    lcd_command(KS0073_4LINES_MODE);
    lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
#else
    lcd_command(LCD_FUNCTION_DEFAULT);      /* function set: display lines  */
#endif
    lcd_command(LCD_DISP_OFF);              /* display off                  */
    lcd_clrscr();                          /* display clear                */
    lcd_command(LCD_MODE_DEFAULT);          /* set entry mode              */
    lcd_command(dispAttr);                  /* display/cursor control      */

}/* lcd_init */

---

Aber eigentlich werden da überall nur die in lcd.h vordefinierten Ports und Pins benutzt, d.h. an PD6 dürfte eigentlich nichts geändert werden...

Hallo,
den Code hab ich mir nicht genau durchgeschaut. Vielleicht kannst Du das Problem etwas einschränken, wenn Du mit den Ports rum spielst. Leg z.B. mal den LCD_DATA2_PORT auf PORTC. (Dann geht halt das Display nicht mehr.)
Reicht schon die lcd_init(), damit der PWM nicht mehr geht? Oder ist das Problem erst da, wenn alle 3 Funktionen dastehen? Dann könntest Du mal geziehlt die lcd_init() anschauen. (und anpassen)

Viel Erfolg,
Drew

Ich habe schon versucht, wie von drew vorgeschlagen, den PORTD in lcd.h vollständig herauszuhalten, was aber leider nichts gebracht hat. Es reicht schon lcd_init() um das PWM-Signal zu stören.

Das einzig "verdächtige" in lcd_init() scheint mir folgendes sein zu können:

Code:

---

/* enable external SRAM (memory mapped lcd) and one wait state */      
MCUCR = _BV(SRE) | _BV(SRW);

---

Ich weiß aber nicht, ob das auf die PWM Einfluss nehmen könnte...

Das, was ich an PD6 (dort wo eigentlich das PWM-Signal anliegen sollte) messe, sieht übrigens so aus:

Anhang 18730