LCDHD44780与PIC18不起作用

我尝试使用LCD时遇到了一些麻烦。我正在使用LCDHD44780 2x16和PIC18F与MPLAB。我觉得我的代码很好，我可以编译这个项目，但是当我尝试使用它来显示一个简单的字符时，LCD仍然没有任何反应。有什么不对下面的代码：LCDHD44780与PIC18不起作用

#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++); 
}

在我.h文件中我有：

#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);

来源

2016-07-27 Bruno Santos