freemanantony
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hi everybody,
i am trying to interface jhd162A lcd with pic18F25k22 microcontroller. Port A is used to connect lcd control as well as data lines. Initially i used port registers to write outputs but after reading through the forum i changed it to Lat . i am using internal oscillator INTOSC67 in config1 register as clock thus i can use RA6 and RA7 as GPIO and i have disabled all other analog functions of the port . But only weird characters are getting displayed in the LCD. Can anyone help me out on this issue
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- - - Updated - - -
this is the initialization part of the code
i am trying to interface jhd162A lcd with pic18F25k22 microcontroller. Port A is used to connect lcd control as well as data lines. Initially i used port registers to write outputs but after reading through the forum i changed it to Lat . i am using internal oscillator INTOSC67 in config1 register as clock thus i can use RA6 and RA7 as GPIO and i have disabled all other analog functions of the port . But only weird characters are getting displayed in the LCD. Can anyone help me out on this issue
- - - Updated - - -
Code:
#pragma config FOSC = INTIO67 // Oscillator (LP,XT,HSHP,HSMP,RC,RCIO6,ECHP, //INTIO7
// ECHPIO6,INTIO67,INTIO7,ECMPIO6,ECLP,ECLPIO6)
#pragma config PLLCFG = OFF // 4X PLL Enable
#pragma config PRICLKEN = OFF // Primary clock enable
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable
#pragma config IESO = OFF // Internal/External Oscillator Switchover
// CONFIG2L
#ifdef __DEBUG
#pragma config PWRTEN = OFF // Power-up Timer Enable
#else
#pragma config PWRTEN = ON
#endif
#pragma config BOREN = SBORDIS // Brown-out Reset Enable (OFF,ON,NOSLP,SBODIS)
#pragma config BORV = 190 // Brown Out Reset Volt.(285,250,220,190)[V/100]
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer Enable (OFF,NOSLP,SWON,ON)
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select (1:32768)
// CONFIG3H
#pragma config CCP2MX = PORTC1 // ECCP2 B output mux (PORTB3, PORTC1)
#pragma config PBADEN = OFF // PORTB A/D Enable
#pragma config CCP3MX = PORTB5 // CCP3 MUX (PORTB5, PORTC6)
//#pragma config HFOFST = ON // HFINTOSC Fast Start-up
#pragma config T3CMX = PORTC0 // Timer3 Clock input mux (PORTB5,PORTC0)
#pragma config P2BMX = PORTB5 // ECCP2 B output mux (PORTB5,PORTC0)
#ifdef __DEBUG
#pragma config MCLRE = EXTMCLR // MCLR Pin Enable (MCLR / RE3)
#else
#pragma config MCLRE = INTMCLR
#endif
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable
#pragma config LVP = OFF // Single-Supply ICSP Enable
#pragma config XINST = OFF // Extended Instruction Set Enable
// CONFIG5L
#pragma config CP0 = OFF // Code Protection Block 0
#pragma config CP1 = OFF
//#pragma config CP2 = OFF
//#pragma config CP3 = OFF
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protection
#pragma config CPD = OFF // Data EEPROM Code Protection
// CONFIG6L
#pragma config WRT0 = OFF // Write Protection Block 0
#pragma config WRT1 = OFF
//#pragma config WRT2 = OFF
//#pragma config WRT3 = OFF
// CONFIG6H
#pragma config WRTC = OFF // Configuration Register Write Protection
#pragma config WRTB = OFF // Boot Block Write Protection
#pragma config WRTD = OFF // Data EEPROM Write Protection
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protection Block 0
#pragma config EBTR1 = OFF
//#pragma config EBTR2 = OFF
//#pragma config EBTR3 = OFF
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protection*/
void hw_init()
{
//OSCCON = 0x3C;
//OSCCON2 = 0x06;
//PORTA =0x00;
//LATA =0x00;
//ANSEL = 0x00;
//ANSELH = 0x00;
TRISA=0x00;// LCD O/P
TRISB=0xEF;
TRISC=0x80;
ANSELA = 0X00;
ANSELB = 0X00;
ANSELC = 0X00;
C1ON = 0;
C2ON = 0;
CM1CON0 =0X00;
CM2CON0 = 0X00;
CCP1CON = 0x00;
CCP2CON = 0x00;
CCP3CON = 0x00;
CCP4CON = 0x00;
CCP5CON = 0x00;
VREFCON1 =0X00;
VREFCON2 =0X00;
VREFCON0 =0X00;
// CVREN =0;
//CVRCON = 0x00;
CM1CON = 0x00;
//CANCON =0X00;
INTCON=0x00; //Disable interrupts
//OPTION |= 0x0F; //1:2 prescaler // PRESCALAR TO 1:256, WATCH DOG ENABLE ON 25-01-2013
// OPTION_REG = 0x00; //1:2 prescaler
T0IE = 1; //temporarily disable Timer0 interrupt // TIMER ENABLED ON 25-01-2013
// WPUB=0xF0;//WEAK PULL-UP
// IOCB=0x00;//INTERRUPT ON CHANGE
// RBPU=0; // PORTB PULLUP ENABLE
// nRBPU=0; // PORTB PULLUP ENABLE
//TIMER
T1CON=0x00;
//TMR1CS=0; //INTERNAL TIMER1 CLOCK
T0CS=0; //Timer0
T2CON=0x7A; //TIMER2(1:16 prescaler and 1:16 postscaler)
CLRWDT();
BRGH1 = 1;
BRG161 =0;
SPBRG =0x19; // TO GENERATE BAUDRATE = 9600
SPBRGH=0x00;
SYNC1 = 0; //ASYNCHRONOUS MODE
SPEN1 = 0; // SERIAL PORT ENABLE
TXEN1=1;
CREN1=1;
TXIF=0;
RCIF=0;- - - Updated - - -
this is the initialization part of the code
