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Thank you, nerdegutta, I just did something similar
Anyway here is the code
I changed port C to Port D.
Some configuration options seemed not to be available to the 4553.
What to do now....
Anyway here is the code
Code:
/*
* File: main.c
*Here we have adapted the code from JohninTx that is originally for 16F1787
* to our processor 18F4553
*
* Created on 2015/08/06, 16:57
*/
//#include <stdio.h>
#include <stdlib.h>
#include <xc.h>
// #pragma config statements should precede project file includes.
#pragma config PLLDIV = 5 //(20MHz crystal div by 5 preescale
#pragma config CPUDIV = OSC4_PLL6 //we get 16 MHz
#pragma config FOSC = INTOSC_HS //Internal oscillator, HS oscillator used by USB (INTHS)
#pragma config USBDIV = 2 //Usb from PLL
#pragma config FCMEN = OFF //ADDED fail safe clock disabled
#pragma config IESO = OFF //oscillator switch over mode disabke
#pragma config PWRT = OFF
#pragma config BOR = ON //CHANGED
#pragma config BORV=3 //ADDED
#pragma config VREGEN = ON //CHANGED
#pragma config WDT = OFF
#pragma config WDTPS = 32768
#pragma config CCP2MX = ON
#pragma config PBADEN = OFF
#pragma config LPT1OSC = OFF
#pragma config MCLRE = ON
#pragma config STVREN = ON
#pragma config LVP = OFF
#pragma config ICPRT = OFF
#pragma config XINST = OFF
#pragma config DEBUG = OFF
#pragma config WRTD = OFF
#define _XTAL_FREQ 4000000 // 4MHz for the delay function
void initIO(void)
{
OSCCON = 0x62; // 0110 0010 set CPU Frequency as 4 MHz Internal Oscillator
TRISD=0x00;
PORTD=0x00;
//no analog inputs on D
}
//---------------------IO DEFINITIONS --------------------------
// These are for the F4553
#define lcd_port LATD // write to LAT, read from PORT
// RD7-4 is the LCD 4 bit databus
#define LCD_RSout LATD2 // moved from ICSP
#define LCD_ENout LATD3
//-------------------- DISPLAY SETTINGS ---------------------
// Define some display settings. These could be defined as complete
// commands as well..
#define lcdLINE1 0x00 // where line 1 begins
#define lcdLINE2 0x40 // where line 2 begins
//--------------------- STROBE LCD ---------------------------
// Pulses E line on LCD to write
int strobeLCD(void)
{
LCD_ENout = 1;
__delay_us(2); // Added a little here
LCD_ENout = 0;
}
//--------------------- WRITE 8 BIT DATA TO LCD -----------------
// Assumes LCD is ready and RS is set to correct value
// LCD data bus is RD4-RD7
// Enable cycle time is a side effect of execution time - faster clocks
// may require a specific delay.
void writeLCD(unsigned char dat)
{
lcd_port &= 0x0f; // get current port, clear upper bits
lcd_port |= (dat & 0xf0); // combine w/upper nibble, leave lower same
strobeLCD();
lcd_port &= 0x0f; // get current port, clear upper bits
lcd_port |= ((dat <<4) & (0xf0)); // combine w/lower nibble, leave lower port same
strobeLCD();
__delay_ms(2); // wait for display to process
}
//-------------------- WRITE LCD COMMAND -------------------------
// Write cmd to LCD with RS=0
// Assumes E is low and display is NOT busy
void lcd_cmd (unsigned char cmd)
{
LCD_RSout = 0; // select command register
writeLCD(cmd);
}
//---------------------- WRITE LCD DATA --------------------------
// Write dat to LCD with RS=1
// Assumes E is low and display is NOT busy
void lcd_data (unsigned char dat)
{
LCD_RSout = 1; // select data register
writeLCD(dat);
}
//-------------------- RESET/CONFIGURE LCD -------------------------
// Delays are generous, trim when able
void lcd_init(void)
{
lcd_port &= 0x0f; // clear upper bits of LCD port
lcd_port |= 0x30; // direct data to LCD DB7-4
LCD_RSout = 0;
strobeLCD(); // write 3h, wait 10ms
__delay_ms(10);
strobeLCD(); // write 3h, wait..
__delay_ms(10);
strobeLCD(); // write 3h
__delay_ms(10);
lcd_port &= 0x0f; // clear upper bits of LCD port
lcd_port |= 0x20; // direct data to LCD DB7-4
strobeLCD(); // write 2h
__delay_ms(10);
lcd_cmd(0x28); // Funciton Set: 4-bit mode - 2 line - 5x7 font.
lcd_cmd(0x0e); // DisplayON, cursor ON, blink OFF
lcd_cmd(0x06); // Automatic Increment - No Display shift.
lcd_cmd(0x80); // Address DDRAM with 0 offset 80h.
}
//----------------------- WRITE STRING TO LCD ---------------------
// Writes null terminated string to LCD from ROM
void lcd_WriteStr(const unsigned char *c)
{
while(*c != '\0'){
lcd_data(*c);
c++;
}
}
//-------------------- SETS CURSOR ANYWHERE IN DISPLAY MEMORY ---------
// Valid locations are 0-79 decimal. This doesn't check for valid location
void lcd_SetCursor(unsigned char loc)
{
lcd_cmd(loc | 0x80); // form and send 'set DDRAM address' cmd
}
//----------------- CANNED LINE COMMANDS -------------------------
// For a 2 line display
void lcd_LINE1(void)
{
lcd_SetCursor(lcdLINE1);
}
void lcd_LINE2(void)
{
lcd_SetCursor(lcdLINE2);
}
//======================= MAIN =====================================
const char spin[] = {".oOo. "};
int main(int argc, char** argv)
{
unsigned char i;
initIO(); // init the chip IO
__delay_ms(100); // power up delay for LCD - adjust as necessary
__delay_ms(100);
__delay_ms(100);
lcd_init(); // init the LCD
lcd_WriteStr("Howdy there");
lcd_LINE2();
lcd_WriteStr("from TX!");
// a little active display :)
do{
for(i=0; spin[i]!= '\0'; i++){
lcd_SetCursor(lcdLINE2 + 11); // locate spinner
lcd_data(spin[i]);
__delay_ms(100);
__delay_ms(100);
// __delay_ms(200);
}
}while(1); // do forever
return (EXIT_SUCCESS);
}Some configuration options seemed not to be available to the 4553.
What to do now....
, I checked the wiring since I have been changing it for every code I ve tried. In the first try I did the data lines were actually inverted but now they are ok. How do you see for sure if the LCD is blown? I dont want to go to the shop buy another one and have the same problem...
