LCD mit HD44780 an Atmel SAM4S

[Rene V. (rene_v)]

Hallo,

bin gerade dabei ein altes Faxdisplay an einem AT91SAM4S16 
(Xplained-Board) zum Leben zu erwecken. Den Beispielcode habe ich von 
hier übernommen und versucht anzupassen:
http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial/LCD-Ansteuerung
Das Display wird im 4-bit-Modus angesteuert und ist folgendermaßen 
beschaltet:

PA11 -----> RS
PA12 -----> E
GND  -----> RW
PA13 -----> DB4
PA14 -----> DB5
PA15 -----> DB6
PA16 -----> DB7

Eine andere Möglichkeit gab es bei dem Board nicht, um 6 hintereinander 
folgende und nach Außen geführte Pins zu benutzen.
Es scheint so weit zu laufen. Zeichen werden auf dem Display ausgegeben 
nur nicht die Richtigen. Besonders was die Ausgabe von Strings angeht.
Mich würde insbesondere interessieren, ob die Funktion lcd_out richtig 
übernommen wurde. In dieser schiebe ich die übergebenen Daten um 12 
Stellen nach links, um sie an PA13-16 auszugeben.

static void lcd_out( uint32_t data )
{
  ioport_set_port_level(IOPORT_PIOA,MASKDB,0); // DB-Ports auf 0 setzen
  ioport_set_port_level(IOPORT_PIOA,MASKDB,(data<<12)); // Bits um 12 stellen nach links verschieben (PA13) und setzen
  lcd_enable();
}

Ich hoffe mir kann jemand helfen und bedanke mich schon mal für Tips.

[Jirka (Gast)]

Hello.
i found your post. And I want ask you. What was wrong in this code? 
Thank you.

[Jirka (Gast)]

Ok. Here is function code for HD44780. It´s only basic communication.

#include <asf.h>
#include "conf_board.h"
#include "conf_clock.h"

/**********************
PA11 -----> RS
PA12 -----> E
GND -----> RW
PA13 -----> DB4
PA14 -----> DB5
PA15 -----> DB6
PA16 -----> DB7
***********************/

#define LEDnaPD22  IOPORT_CREATE_PIN(PIOD, 22)  //PPin na kterem je pripojena LED

#define LCD_RS    IOPORT_CREATE_PIN(PIOA, 11)
#define LCD_EN    IOPORT_CREATE_PIN(PIOA, 12)
#define LCD_D4    IOPORT_CREATE_PIN(PIOA, 13)
#define LCD_D5    IOPORT_CREATE_PIN(PIOA, 14)
#define LCD_D6    IOPORT_CREATE_PIN(PIOA, 15)
#define LCD_D7    IOPORT_CREATE_PIN(PIOA, 16)

void lcd_strobe(void);
void lcd_write(unsigned char c);
void lcd_clear(void);
void lcd_puts(const char * s);
void lcd_putch(unsigned char c);
void lcd_goto(unsigned char pos,unsigned char line);
void lcd_init(void);

void lcd_strobe(void)
{
  ioport_set_pin_level(LCD_EN, 1);
  delay_us(1);
  ioport_set_pin_level(LCD_EN, 0);
}

void lcd_write(unsigned char c)
{
  //upper
  if(c & 0x80) ioport_set_pin_level(LCD_D7, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D7, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x40) ioport_set_pin_level(LCD_D6, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D6, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x20) ioport_set_pin_level(LCD_D5, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D5, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x10) ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_LOW);
  lcd_strobe();
  //lowwer
  if(c & 0x08) ioport_set_pin_level(LCD_D7, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D7, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x04) ioport_set_pin_level(LCD_D6, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D6, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x02) ioport_set_pin_level(LCD_D5, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D5, IOPORT_PIN_LEVEL_LOW);
  if(c & 0x01) ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_HIGH); else ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_LOW);
  lcd_strobe();
  delay_us(40);
}

void lcd_clear(void)
{
  ioport_set_pin_level(LCD_RS, IOPORT_PIN_LEVEL_LOW);
  lcd_write(0x1);
  delay_ms(2);
}

void lcd_puts(const char * s)
{
  ioport_set_pin_level(LCD_RS, IOPORT_PIN_LEVEL_HIGH);    // write characters
  while(*s) lcd_write(*s++);
}

void lcd_putch(unsigned char c)
{
  ioport_set_pin_level(LCD_RS, IOPORT_PIN_LEVEL_HIGH);    // write characters
  lcd_write(c);
}

void lcd_goto(unsigned char pos,unsigned char line)
{
  ioport_set_pin_level(LCD_RS, IOPORT_PIN_LEVEL_LOW);
  if (line==0)
    lcd_write(0x80 + pos);
  else
    lcd_write(0x80 + pos+ 0x40);
}

void lcd_init(void)
{
  ioport_set_pin_level(LCD_RS, IOPORT_PIN_LEVEL_LOW);    // write control bytes
  delay_ms(15);// power on delay
  ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_HIGH);    // init
  ioport_set_pin_level(LCD_D5, IOPORT_PIN_LEVEL_HIGH);  //
  lcd_strobe();
  delay_ms(5);
  lcd_strobe();    // init
  delay_us(100);
  lcd_strobe();    // init
  delay_ms(5);
  ioport_set_pin_level(LCD_D4, IOPORT_PIN_LEVEL_LOW);    // set 4 bit mode
  lcd_strobe();
  delay_us(40);
  
  lcd_write(0x28);// 4 bit mode, 1/16 duty, 5x8 font, 2lines
  lcd_write(0x0C);// display on
  lcd_write(0x06);// entry mode advance cursor
  lcd_write(0x01);// clear display and reset cursor
}

int main (void)
{
  sysclk_init();
  board_init();
  ioport_init();
  
  ioport_set_pin_dir(LEDnaPD22, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  
  ioport_set_pin_dir(LCD_RS, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  ioport_set_pin_dir(LCD_EN, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  ioport_set_pin_dir(LCD_D4, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  ioport_set_pin_dir(LCD_D5, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  ioport_set_pin_dir(LCD_D6, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  ioport_set_pin_dir(LCD_D7, IOPORT_DIR_OUTPUT);  //PIN PD18 jako vystupni
  
  ioport_set_pin_level(LEDnaPD22, IOPORT_PIN_LEVEL_LOW);  //inicializuje jako NULA
  
  lcd_init();
  
  while (1)
  {  
    delay_ms(250);
    ioport_toggle_pin_level(LEDnaPD22);
    
    lcd_clear();
    lcd_goto(0,0);
    lcd_puts("Hello") ;
    lcd_goto(5,1);
    lcd_puts("jelito") ;
  }
}