Cantafford
Member
Hey,
I'm trying to use connect an LCD to PORTC of PIC18f2431. So far I have been only connecting LCD's to PORTB when using PICs which is assigned by default.
So I modified the contents of the "xlcd.h" file as this:
I also included the files from " C:\Program Files (x86)\Microchip\xc8\v1.30\include\plib" to my project.
Then wrote this code that's supposed to display some simple text on the lcd:
The header.h is:
This is how I connected the LCD:
When I run this code I don't get any text on the LCD. What am I doing wrong?
I'm trying to use connect an LCD to PORTC of PIC18f2431. So far I have been only connecting LCD's to PORTB when using PICs which is assigned by default.
So I modified the contents of the "xlcd.h" file as this:
Code:
#ifndef __XLCD_H
#define __XLCD_H
#include "p18cxxx.h"
/* PIC18 XLCD peripheral routines.
*
* Notes:
* - These libraries routines are written to support the
* Hitachi HD44780 LCD controller.
* - The user must define the following items:
* - The LCD interface type (4- or 8-bits)
* - If 4-bit mode
* - whether using the upper or lower nibble
* - The data port
* - The tris register for data port
* - The control signal ports and pins
* - The control signal port tris and pins
* - The user must provide three delay routines:
* - DelayFor18TCY() provides a 18 Tcy delay
* - DelayPORXLCD() provides at least 15ms delay
* - DelayXLCD() provides at least 5ms delay
*/
/* Interface type 8-bit or 4-bit
* For 8-bit operation uncomment the #define BIT8
*/
/* #define BIT8 */
/* When in 4-bit interface define if the data is in the upper
* or lower nibble. For lower nibble, comment the #define UPPER
*/
/* #define UPPER */
/* DATA_PORT defines the port to which the LCD data lines are connected */
#define DATA_PORT PORTC
#define TRIS_DATA_PORT TRISC
/* CTRL_PORT defines the port where the control lines are connected.
* These are just samples, change to match your application.
*/
#define RW_PIN LATCbits.LATC6 /* PORT for RW */
#define TRIS_RW TRISCbits.TRISC6 /* TRIS for RW */
#define RS_PIN LATCbits.LATC5 /* PORT for RS */
#define TRIS_RS TRISCbits.TRISC5 /* TRIS for RS */
#define E_PIN LATCbits.LATC4 /* PORT for D */
#define TRIS_E TRISCbits.TRISC4 /* TRIS for E */
/* Display ON/OFF Control defines */
#define DON 0b00001111 /* Display on */
#define DOFF 0b00001011 /* Display off */
#define CURSOR_ON 0b00001111 /* Cursor on */
#define CURSOR_OFF 0b00001101 /* Cursor off */
#define BLINK_ON 0b00001111 /* Cursor Blink */
#define BLINK_OFF 0b00001110 /* Cursor No Blink */
/* Cursor or Display Shift defines */
#define SHIFT_CUR_LEFT 0b00000100 /* Cursor shifts to the left */
#define SHIFT_CUR_RIGHT 0b00000101 /* Cursor shifts to the right */
#define SHIFT_DISP_LEFT 0b00000110 /* Display shifts to the left */
#define SHIFT_DISP_RIGHT 0b00000111 /* Display shifts to the right */
/* Function Set defines */
#define FOUR_BIT 0b00101100 /* 4-bit Interface */
#define EIGHT_BIT 0b00111100 /* 8-bit Interface */
#define LINE_5X7 0b00110000 /* 5x7 characters, single line */
#define LINE_5X10 0b00110100 /* 5x10 characters */
#define LINES_5X7 0b00111000 /* 5x7 characters, multiple line */
#ifdef _OMNI_CODE_
#define PARAM_SCLASS
#else
#define PARAM_SCLASS auto
#endif
#ifndef MEM_MODEL
#ifdef _OMNI_CODE_
#define MEM_MODEL
#else
#define MEM_MODEL far /* Change this to near for small memory model */
#endif
#endif
/* OpenXLCD
* Configures I/O pins for external LCD
*/
void OpenXLCD(PARAM_SCLASS unsigned char);
/* SetCGRamAddr
* Sets the character generator address
*/
void SetCGRamAddr(PARAM_SCLASS unsigned char);
/* SetDDRamAddr
* Sets the display data address
*/
void SetDDRamAddr(PARAM_SCLASS unsigned char);
/* BusyXLCD
* Returns the busy status of the LCD
*/
unsigned char BusyXLCD(void);
/* ReadAddrXLCD
* Reads the current address
*/
unsigned char ReadAddrXLCD(void);
/* ReadDataXLCD
* Reads a byte of data
*/
char ReadDataXLCD(void);
/* WriteCmdXLCD
* Writes a command to the LCD
*/
void WriteCmdXLCD(PARAM_SCLASS unsigned char);
/* WriteDataXLCD
* Writes a data byte to the LCD
*/
void WriteDataXLCD(PARAM_SCLASS char);
/* putcXLCD
* A putc is a write
*/
#define putcXLCD WriteDataXLCD
/* putsXLCD
* Writes a string of characters to the LCD
*/
void putsXLCD(PARAM_SCLASS char *);
/* putrsXLCD
* Writes a string of characters in ROM to the LCD
*/
void putrsXLCD(const char *);
/* User defines these routines according to the oscillator frequency */
extern void DelayFor18TCY(void);
extern void DelayPORXLCD(void);
extern void DelayXLCD(void);
#endifI also included the files from " C:\Program Files (x86)\Microchip\xc8\v1.30\include\plib" to my project.
Then wrote this code that's supposed to display some simple text on the lcd:
Code:
#include <stdio.h>
#include <stdlib.h>
#include "header.h"
#include <plib/delays.h>
#include <plib/xlcd.h>
void init_XLCD(void); //Initialize LCD display
void DelayFor18TCY( void ); //18 cycles delay
void DelayPORXLCD (void); // Delay of 15ms
void DelayXLCD (void); // Delay of 5ms
void main(void)
{
SCS1 = 0;
SCS0 = 0; // select primary oscillator
init_XLCD(); //Call the Initialize LCD display function
putrsXLCD("Some"); //Display some text
SetDDRamAddr(0x40); //shift cursor to beginning of second line
putrsXLCD("text"); // display some text
while(1)
{
}
}
void init_XLCD(void) //Initialize LCD display
{
OpenXLCD(FOUR_BIT&LINES_5X7); //configure LCD in 4-bit Data Interface mode
//and 5x7 characters, multiple line display
while(BusyXLCD()); //Check if the LCD controller is not busy
//before writing some commands
WriteCmdXLCD(0x06); //Move cursor right, don't shift display
WriteCmdXLCD(0x0C); //Turn display on without cursor
}
void DelayFor18TCY( void ) //18 cycles delay
{
Delay10TCYx(20);
}
void DelayPORXLCD (void) //Delay of 15ms
{
Delay1KTCYx(30);
}
void DelayXLCD (void) //Delay of 5ms
{
Delay1KTCYx(10);
}The header.h is:
Code:
// PIC18F2431 Configuration Bit Settings
// 'C' source line config statements
#include <xc.h>
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
// CONFIG1H
#pragma config OSC = XT // Oscillator Selection bits (XT oscillator)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = ON // Internal External Oscillator Switchover bit (Internal External Switchover mode enabled)
// CONFIG2L
#pragma config PWRTEN = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF // Brown-out Reset Enable bits (Brown-out Reset disabled)
// BORV = No Setting
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)
#pragma config WINEN = OFF // Watchdog Timer Window Enable bit (WDT window disabled)
// CONFIG3L
#pragma config PWMPIN = OFF // PWM output pins Reset state control (PWM outputs disabled upon Reset (default))
#pragma config LPOL = HIGH // Low-Side Transistors Polarity (PWM0, 2, 4 and 6 are active-high)
#pragma config HPOL = HIGH // High-Side Transistors Polarity (PWM1, 3, 5 and 7 are active-high)
#pragma config T1OSCMX = ON // Timer1 Oscillator MUX (Low-power Timer1 operation when microcontroller is in Sleep mode)
// CONFIG3H
#pragma config MCLRE = OFF // MCLR Pin Enable bit (Disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = ON // Low-Voltage ICSP Enable bit (Low-voltage ICSP enabled)
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000200-000FFFh) not code-protected)
#pragma config CP1 = OFF // Code Protection bit (Block 1 (001000-001FFF) not code-protected)
#pragma config CP2 = OFF // Code Protection bit (Block 2 (002000-002FFFh) not code-protected)
#pragma config CP3 = OFF // Code Protection bit (Block 3 (003000-003FFFh) not code-protected)
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protection bit (Boot Block (000000-0001FFh) not code-protected)
#pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM not code-protected)
// CONFIG6L
#pragma config WRT0 = OFF // Write Protection bit (Block 0 (000200-000FFFh) not write-protected)
#pragma config WRT1 = OFF // Write Protection bit (Block 1 (001000-001FFF) not write-protected)
#pragma config WRT2 = OFF // Write Protection bit (Block 2 (002000-002FFFh) not write-protected)
#pragma config WRT3 = OFF // Write Protection bit (Block 3 (003000-003FFFh) not write-protected)
// CONFIG6H
#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot Block (000000-0001FFh) not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM not write-protected)
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protection bit (Block 0 (000200-000FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Table Read Protection bit (Block 1 (001000-001FFF) not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Table Read Protection bit (Block 2 (002000-002FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Table Read Protection bit (Block 3 (003000-003FFFh) not protected from table reads executed in other blocks)
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot Block (000000-0001FFh) not protected from table reads executed in other blocks)
#define _XTAL_FREQ 25000000This is how I connected the LCD:
When I run this code I don't get any text on the LCD. What am I doing wrong?
