serial communication problem

[arafatronics]

hi all
i'm a beginner in pic microcontroller
i'm programming two pic18f4550 one sender and the other is a reciever which connected Rx to Tx to communicate
i wrote the program in mikroc c based on its library and tested on protus and worked
but in the real world nothing work at all
the sender code is :

char uart_rd;

void main() {
ADCON1 |= 0x0F; // Configure all ports with analog function as digital
CMCON |= 7; // Disable comparators

TRISC0_bit = 0;
TRISC2_bit = 0; RC2_bit = 1;

UART1_Init(9600); // Initialize UART module at 9600 bps
Delay_ms(100); // Wait for UART module to stabilize
SPEN_bit = 1;
TXEN_bit = 1;



while (1) { // Endless loop

Delay_ms(1000);
UART1_Write(0x01);
RC0_bit^=1;
Delay_ms(1000);
UART1_Write(0x02);
RC0_bit^=1;
}
}
the reciever code is :

char uart_rd;

void main() {
ADCON1 |= 0x0F; // Configure all ports with analog function as digital
CMCON |= 7; // Disable comparators

TRISD=0;
TRISC0_bit = 0;
TRISC2_bit = 0; RC5_bit = 0;

UART1_Init(9600); // Initialize UART module at 9600 bps
Delay_ms(100); // Wait for UART module to stabilize
SPEN_bit=1;
CREN_bit=1;



while (1) { // Endless loop
if (UART1_Data_Ready()) { // If data is received,
uart_rd = UART1_Read(); // read the received data,
if(uart_rd==0x01) RD5_bit^=1;
if(uart_rd==0x02) RD7_bit^=1;
if((uart_rd!=0x01) && (uart_rd!=0x02)) RD3_bit^=1;
}

}
}

 

[Golden Electronics]

1. For Tx TRISCx = 0; Rx = TRISCx = 1; where x corresponding to corresponding port pin.
Also Try to use Receive interrupt.
2. Check is Ur Individual control Transmit data correct on Hyper Terminal. Don't assume
simulation work means practical circuit also work.
3. Check B.R setting according to ur Crystal.

 

[tpetar]

Dont forget to link Gnd.



Best regards,
Peter

;-)

 

[rajrahul2391]

you need to connect 0.1uf(tantalum) capacitor between pin 15 and grount,this will remove timing error in communication.
try it