LCDHD44780 avec PIC18 ne fonctionne pas

Question

Je rencontre des problèmes lorsque j'utilise LCD. J'utilise LCDHD44780 2x16 et PIC18F avec MPLAB. Je pense que mon code est bon et je peux compiler le projet mais toujours rien ne se passe sur l'écran LCD lorsque j'essaie de l'utiliser pour afficher un simple caractère. Quel est le problème avec le code suivant:

#include "LCD_HD44780.h" 


void LCD_HD44780_reset(void) 
{ 
    TRIS_D7 = 0; 
    TRIS_D6 = 0; 
    TRIS_D5 = 0; 
    TRIS_D4 = 0; 
    DATA_D7 = 0; 
    DATA_D6 = 0; 
    DATA_D5 = 0; 
    DATA_D4 = 0; 

    RW_PIN = 0; // R/W pin made low 
    RS_PIN = 0; // Register select pin made low 
    E_PIN = 0; // Clock pin made low 
    TRIS_RW = 0; // All control signals made outputs 
    TRIS_RS = 0; 
    TRIS_E = 0; 

    __delay_ms(15); 

    LCD_HD44780_sendCmd8bit(0x30); 
    __delay_ms(10); 
    LCD_HD44780_sendCmd8bit(0x30); 
    __delay_ms(10); 
    LCD_HD44780_sendCmd8bit(0x30); 
    __delay_ms(10); 
} 

void LCD_HD44780_init(void) 
{ 
    LCD_HD44780_reset(); 

    // Enable 4 bit mode 
    LCD_HD44780_sendCmd8bit(0x20); 
    __delay_ms(10); 
    LCD_HD44780_sendCmd(0x28);   //Function set: 4 bit interface 
    LCD_HD44780_sendCmd(0x0f); //Display on/off: display on, cursor off,  blink off 
    LCD_HD44780_ClearScreen(); 
    LCD_HD44780_sendCmd(0x06); //Entry mode: increment, no shift 
} 

void LCD_HD44780_sendCmd8bit(BYTE c) 
{ 
    RW_PIN = 0; // Set the control signals 
    RS_PIN = 0; // for sending a command 

    LCD_HD44780_writeNibble((c & 0xF0) >> 4); //send only 4 msb 
} 

void LCD_HD44780_sendCmd(BYTE c) 
{ 
    RW_PIN = 0; // Set the control signals 
    RS_PIN = 0; // for sending a command 

    LCD_HD44780_writeNibble((c & 0xF0) >> 4); 
    LCD_HD44780_writeNibble(c & 0x0F); 
} 

void LCD_HD44780_sendData(BYTE d) 
{ 
    RW_PIN = 0; // Set the control signals 
    RS_PIN = 1; // for sending data 

    LCD_HD44780_writeNibble((d & 0xF0) >> 4); 
    LCD_HD44780_writeNibble(d & 0x0F); 
} 

void LCD_HD44780_sendStr(BYTE *str) 
{ 
    while(*str != 0) 
    { 
     LCD_HD44780_sendData(*str++); 
    } 
} 

void LCD_HD44780_setCursor(BYTE row, BYTE col) 
{ 
    BYTE command; 
    BYTE add = row*0x40 + col; 
    command = 0x80 | add; 
    LCD_HD44780_sendCmd(command); 
} 


void LCD_HD44780_writeNibble(BYTE nb) 
{ 
    BYTE a; 

    if(nb & 0x08) 
    { 
     DATA_D7 = 1; 
    } 
    else 
    { 
     DATA_D7 = 0; 
    } 

    if(nb & 0x04) 
    { 
     DATA_D6 = 1; 

    } 
    else 
    { 
     DATA_D6 = 0; 
    } 

    if(nb & 0x02) 
    { 
     DATA_D5 = 1; 
    } 
    else 
    { 
     DATA_D5 = 0; 
    } 

    if(nb & 0x01) 
    { 
     DATA_D4 = 1; 

    } 
    else 
    { 
     DATA_D4 = 0; 
    } 

    E_PIN = 1; 

    for(a = 0; a < 4; a++); 

    E_PIN = 0; 

    for(a = 0; a < 4; a++); 
} 

Dans mon .h j'ai:

#define _XTAL_FREQ 20000000 

#define RW_PIN LATCbits.LATC0  /* PORT for RW */ 
#define TRIS_RW TRISCbits.TRISC0  /* TRIS for */ 
#define RS_PIN LATCbits.LATC2  /* PORT for RS */ 
#define TRIS_RS TRISCbits.TRISC2  /* TRIS for RS */ 
#define E_PIN LATCbits.LATC1  /* PORT for E */ 
#define TRIS_E TRISCbits.TRISC1  /* TRIS for E */ 
#define DATA_D7 LATEbits.LATE7  // LAT for DISP 7 
#define DATA_D7_RD PORTEbits.RE7  // PORT for DISP 7 
#define TRIS_D7 TRISEbits.TRISE7  // TRIS for DISP 7 
#define DATA_D6 LATEbits.LATE6  // LAT for DISP 6 
#define DATA_D6_RD PORTEbits.RE6  // PORT for DISP 6 
#define TRIS_D6 TRISEbits.TRISE6  // TRIS for DISP 6 
#define DATA_D5 LATEbits.LATE5  // LAT for DISP 5 
#define DATA_D5_RD PORTEbits.RE5  // PORT for DISP 5 
#define TRIS_D5 TRISEbits.TRISE5  // TRIS for DISP 5 
#define DATA_D4 LATEbits.LATE4  // LAT for DISP 4 
#define DATA_D4_RD PORTEbits.RE4  // PORT for DISP 4 
#define TRIS_D4 TRISEbits.TRISE4  // TRIS for DISP 4 

#define LCD_HD44780_CursorHome() LCD_HD44780_sendCmd(0x02); 
#define LCD_HD44780_ScrollLeft() LCD_HD44780_sendCmd(0x18); 
#define LCD_HD44780_ScrollRight() LCD_HD44780_sendCmd(0x1E); 
#define LCD_HD44780_ClearScreen() LCD_HD44780_sendCmd(0x01); 
#define LCD_HD44780_CursorOff()  LCD_HD44780_sendCmd(0x0C); 
#define LCD_HD44780_ClearOn()  LCD_HD44780_sendCmd(0x0E); 

Answer 1

Bruno: Voici tutoriel travaille pour le même écran LCD avec la série PIC18 MCU Click Here

Je suggère également de comparer votre matériel avec ce design de référence.