piscaroy
Junior Member level 3
hi,
i encountered a problem with my serial communication when doing some sending and recieving of datas...when i use the serial com tool(Advanced Serial Port Monitor--ASPM) to send data to my PIC18f452, it is working fine(which means it can receive and display on LCD)but when i change to another part of my project, which is to use Visual Basic(mscom coding) program to send Data to my PIC, this time the PIC only able to detect data at serial com port,but unable to display the Data on the LCD...i have tested the sending of the VB codes..i used the VB to send data thru com port1 and use the ASPM to spy on the port..and is able to capture the data and display in the window...i oso tried changing the baud rate but it still doesnt work..how come will like dat?? pls help...thanks alot
my codes...
best regards
i encountered a problem with my serial communication when doing some sending and recieving of datas...when i use the serial com tool(Advanced Serial Port Monitor--ASPM) to send data to my PIC18f452, it is working fine(which means it can receive and display on LCD)but when i change to another part of my project, which is to use Visual Basic(mscom coding) program to send Data to my PIC, this time the PIC only able to detect data at serial com port,but unable to display the Data on the LCD...i have tested the sending of the VB codes..i used the VB to send data thru com port1 and use the ASPM to spy on the port..and is able to capture the data and display in the window...i oso tried changing the baud rate but it still doesnt work..how come will like dat?? pls help...thanks alot
my codes...
Code:
#include <p18f452.h>
#include <usart.h>
#include <stdlib.h>
#include <delays.h>
#include <xlcd.h>
#include <string.h>
#define BUFF_SIZE 20
#define SIZE1 15
#define MAX_CHAR 15
//helper functions
void readFrmEEPROM(int address, int bytes, char *tempStr);
void writeStr2EEPROM(int address, char *str);
/************************************************************************/
/******************* SUBROUTINES ***********************/
/************************************************************************/
/********************************************/
/********** LCD Subroutines ***************/
/********************************************/
// I/O Configuration
void InitializePORTS(void)
{
TRISC= 0xE0;
}
// LCD initialisation
void DelayPORXLCD( )
{
Delay1KTCYx(15); //Delay of 15ms
}
void DelayXLCD(void)
{
Delay1KTCYx(5);
}
void DelayFor18TCY(void)
{
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
Nop();
return;
}
void LCDinit(void){
PORTA=0x00;
ADCON1 = 0x0E;
OpenXLCD(0x28); //Init LCD 4-bit interface lower nibble,
//multiple line
DelayXLCD();
}
void LCDclr(void){
WriteCmdXLCD(0x01);
DelayXLCD();
}
/********************end of LCD rountine***************************/
void Delay5s(void){
Delay10KTCYx(250);
Delay10KTCYx(250);
}
/****************************************************/
/********** EEPROM Subroutine ***************/
/****************************************************/
//EEprom Initialisation
void EEpromInit(void){
EECON1 = 0x00;
EECON1bits.WREN = 1; //set EECON reg to allow write cycles
}
unsigned char ReadEEPROM(unsigned char Adresse)
{
EEADR = Adresse;
EECON1bits.EEPGD = 0; //access DATA EEPROM
EECON1bits.CFGS = 0; //access Flash program/Data EEprom memory
EECON1bits.RD = 1; //enable Read
return EEDATA; //data is stored here
}
void WriteEEPROM(unsigned char Adresse, char Data)
{
EEADR = Adresse; //
EEDATA = Data; //
EECON1bits.EEPGD = 0;
EECON1bits.CFGS = 0;
EECON1bits.WREN = 1;
INTCONbits.GIEH = 0; //disable interrupts
INTCONbits.GIEL = 0;
EECON2 = 0x55;
EECON2 = 0xAA;
EECON1bits.WR = 1;
while(EECON1bits.WR); //Waiting for WR to be clear
EECON1bits.WREN = 0; //disable writes on write complete
}
/*******************************************************/
/*Function to write a string to EEprom given an address*/
/*******************************************************/
void writeStr2EEPROM(int address, char *str) {
int len;
int i=0;
len = strlen(str);
//loop to write each character to EEPROM
for(i=0; i<MAX_CHAR ; i++) {
WriteEEPROM(address+i , str[i]);
//test = readEERPOM(EEADR+i);
}
}
/*******************************************************/
/*Function to read x bytes from eeprom given an address*/
/*x bytes must be at most 15 characters */
/*******************************************************/
void readFrmEEPROM(int address, int bytes, char *tempStr){
int i=0;
if (bytes <= MAX_CHAR){
for(i=0;i<bytes;i++) {
tempStr[i] = ReadEEPROM(address+i);
}
}
tempStr[bytes] = '\0';
}
/***********************END of EEPROM routine******************/
/**************************************************************/
/* MAIN PROGRAM */
/**************************************************************/
//main programm
void main(){
int writeAdd,readAdd;
char recData[15];
char tempRead[15];
char counter;
char counter1;
InitializePORTS();
EEpromInit();
LCDinit();
//configure USART
OpenUSART(USART_TX_INT_OFF &
USART_RX_INT_OFF &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH,
25);
Delay10KTCYx(50); // delay 0.5 sec
while(1){
while(!DataRdyUSART()); //check whether data is received and available
getsUSART(recData,17); //get 17 characters from serial com port
counter=0;
do{
WriteEEPROM(counter,recData[counter]);
counter++;
}while(counter<16);
putrsXLCD("waiting...");
Delay10KTCYx(100); //delay 1 sec
WriteCmdXLCD(0x01); //clr LCD
counter=0;
do {
tempRead[counter]=ReadEEPROM(counter);
counter++;
}while(counter<16);
putsXLCD(tempRead);
Delay10KTCYx(200); //delay 2 secs
WriteCmdXLCD(0x01); // clr display
}
}best regards