PIC16F877 and GPS module (EM-406A)

[osama]

Hi every one 

 

i wrote this code for a project to interface EM-406A with PIC 16F877

but it does’t work .

 

 

 

^{char uart_rd;}

^{char uart[11];}

 

^{// LCD module connections}

^{sbit LCD_RS at LATB2_bit;}

^{sbit LCD_EN at LATB3_bit;}

^{sbit LCD_D4 at LATB4_bit;}

^{sbit LCD_D5 at LATB5_bit;}

^{sbit LCD_D6 at LATB6_bit;}

^{sbit LCD_D7 at LATB7_bit;}

 

^{sbit LCD_RS_Direction at TRISB2_bit;}

^{sbit LCD_EN_Direction at TRISB3_bit;}

^{sbit LCD_D4_Direction at TRISB4_bit;}

^{sbit LCD_D5_Direction at TRISB5_bit;}

^{sbit LCD_D6_Direction at TRISB6_bit;}

^{sbit LCD_D7_Direction at TRISB7_bit;}

^{// End LCD module connections}

 

^{void main() {}

  ^{TRISB = 0;}

  ^{PORTB = 0x00;}

 

  ^{UART1_Init(4800);              // Initialize UART module at 9600 bps}

  ^{Delay_ms(3000);                 // Wait for UART module to stabilize}

 

  ^{//UART1_Write_Text(“Start”);}

  ^{Lcd_Init();                        // Initialize LCD}

  ^{Lcd_Cmd(_LCD_CLEAR);                // Clear display}

  ^{Lcd_Cmd(_LCD_CURSOR_OFF);           // Cursor off}

 

  ^{lcd_out(1,1,”lcd”);}

  ^{delay_ms(1000);}

 

  ^{uart1_write(0x08);}

  ^{delay_ms(5000);}

  ^{while(1) {}

      ^{// uart1_write_text(“$GPGGA,002153.000,3342.6618,N,11751.3858,W,1,10,1.2,27.0,M,-34.2,M,,0000*5E,0x0d,0x0a”);}

     ^{//uart1_write_text(“$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41,0x0d,0x0a”);}

     ^{//uart1_write(0x0d);}

     ^{//uart1_write(0x0a);}

     ^{delay_ms(2000);}

     ^{delay_ms(10000);}

     ^{if(UART1_Data_Ready()) {      // If data is received,}

     ^{uart_rd=uart1_read();}

   ^{//  gps_value=gps_data(GPS_LATHIGH);}

     ^{lcd_chr(2,12,uart_rd);}

     ^{uart1_read_text(uart, “.”, 15);}

     ^{lcd_out(1,5, uart);}

     ^{delay_ms(500);}

  ^}

  ^}

^}

 

 

 

 

 

 

 

 

any suggestions 

 

 

thank u.

 

 

[AJISH ALFRED]

 

Hi,

 

Have you initialized the uart1 properly for the baud rate of 9600?

Don’t try writing into the uart, all you have to do is to read the data coming into the uart1 from the gps.

Could you please comment your code properly and update, so that it would be easy for some one who can really help you with it.

[osama]

 

 

 

 

char uart_rd;

char uart[11];

 

// LCD module connections

sbit LCD_RS at LATB2_bit;

sbit LCD_EN at LATB3_bit;

sbit LCD_D4 at LATB4_bit;

sbit LCD_D5 at LATB5_bit;

sbit LCD_D6 at LATB6_bit;

sbit LCD_D7 at LATB7_bit;

 

sbit LCD_RS_Direction at TRISB2_bit;

sbit LCD_EN_Direction at TRISB3_bit;

sbit LCD_D4_Direction at TRISB4_bit;

sbit LCD_D5_Direction at TRISB5_bit;

sbit LCD_D6_Direction at TRISB6_bit;

sbit LCD_D7_Direction at TRISB7_bit;

// End LCD module connections

 

void main() {

  TRISB = 0;

  PORTB = 0x00;

 

  UART1_Init(4800);              // Initialize UART module at 9600 bps

  Delay_ms(3000);                 // Wait for UART module to stabilize

 

  //UART1_Write_Text(“Start”);

  Lcd_Init();                        // Initialize LCD

  Lcd_Cmd(_LCD_CLEAR);                // Clear display

  Lcd_Cmd(_LCD_CURSOR_OFF);           // Cursor off

 

  lcd_out(1,1,”lcd”);

  delay_ms(1000);

 

  uart1_write(0x08);

  delay_ms(5000);

  while(1) {

      

     delay_ms(2000);

     delay_ms(10000);

     if(UART1_Data_Ready()) {      // If data is received,

     uart_rd=uart1_read();

                                               //  gps_value=gps_data(GPS_LATHIGH);

     lcd_chr(2,12,uart_rd);

     uart1_read_text(uart, “.”, 15);

     lcd_out(1,5, uart);

     delay_ms(500);

  }

  }

}

[Anonymous]

i have the same prob , i send a msg when i find the solution.

[midhun]

 

char uart_rd;

char uart[11];

 

// LCD module connections

sbit LCD_RS at LATB2_bit;

sbit LCD_EN at LATB3_bit;

sbit LCD_D4 at LATB4_bit;

sbit LCD_D5 at LATB5_bit;

sbit LCD_D6 at LATB6_bit;

sbit LCD_D7 at LATB7_bit;

 

sbit LCD_RS_Direction at TRISB2_bit;

sbit LCD_EN_Direction at TRISB3_bit;

sbit LCD_D4_Direction at TRISB4_bit;

sbit LCD_D5_Direction at TRISB5_bit;

sbit LCD_D6_Direction at TRISB6_bit;

sbit LCD_D7_Direction at TRISB7_bit;

// End LCD module connections

 

void main() {

  TRISB = 0;

  PORTB = 0x00;

 

  UART1_Init(4800);              // Initialize UART module at 9600 bps*******************************************UART1_Init(9600);

  Delay_ms(3000);                 // Wait for UART module to stabilize

 

  //UART1_Write_Text(“Start”);// not required, you only receive data. dont send any.

  Lcd_Init();                        // Initialize LCD

  Lcd_Cmd(_LCD_CLEAR);                // Clear display

  Lcd_Cmd(_LCD_CURSOR_OFF);           // Cursor off

 

  lcd_out(1,1,”lcd”); why to display “LCD”?

  delay_ms(1000);

 

  uart1_write(0x08);// why writing this???? remove it.

  delay_ms(5000);// not required.

  while(1) {

      

     delay_ms(2000);

     delay_ms(10000);/// together you can write it asdelay_ms(12000);

     if(UART1_Data_Ready()) {      // If data is received,

     uart_rd=uart1_read();

                                               //  gps_value=gps_data(GPS_LATHIGH);

     lcd_chr(2,12,uart_rd);

     uart1_read_text(uart, “.”, 15);

     lcd_out(1,5, uart);

     delay_ms(500);

  }

  }

}

 

 

just try it nw….

BEST OF LUCK.

 

[Author]

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