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    <pre><code> // // Designed by www.MCUExamples.com // rasika0612@gmail.com // Serial communications example. Echo data comes to serial port // using serial receive interrupt. // #include &lt;p18f4520.h&gt; #pragma config OSC = HS // 20MHz Crystal, (HS oscillator) #pragma config PBADEN = OFF // PORTB&lt;4:0&gt; pins are configured as digital I/O on Reset) #pragma config WDT = OFF // watch dog timer off #pragma config LVP = OFF // Low voltage program off unsigned char cUART_char; unsigned char cUART_data_flg; void init_uart(void); void UART_putc(unsigned char c); void InterruptHandlerLow (); void main() { init_uart(); // init UART module while (1) // infinite loop which handles ncoming data as they arrive { if (cUART_data_flg==1)// if new data available, send it back through USART tx line (echo it) { UART_putc(cUART_char); cUART_data_flg=0; // clear new data flag so one charactor will echoed once } } } //---------------------------------------------------------------------------- //---------------------------------------------------------------------------- #pragma code InterruptVectorLow = 0x18 void InterruptVectorLow (void) { _asm goto InterruptHandlerLow //jump to interrupt routine _endasm } //---------------------------------------------------------------------------- // Low priority interrupt routine #pragma code #pragma interrupt InterruptHandlerLow void InterruptHandlerLow () { if (PIR1bits.RCIF==1)//is interrupt occured by EUSART receive?, //then RCREG is full we have new data (cleared when RCREG is read) { if(RCSTA&amp;0x06) //more efficient way than following commented method to check for reception error //if(RCSTAbits.FERR==1 || RCSTAbits.OERR==1 ) { RCSTAbits.CREN=0; //Overrun error (can be cleared by clearing bit CREN) cUART_char=RCREG; //clear Framing error RCSTAbits.CREN=1; } else { cUART_char = RCREG; // read new data into variable cUART_data_flg = 1; // new data received. so enable flg } } } //---------------------------------------------------------------------------- //---------------------------------------------------------------------------- void init_uart(void) // init UART module for 9600bps boud, start bit 1, stopbit 1, parity NONE { cUART_data_flg=0; // init data receive flag to zero (no data) TRISCbits.TRISC7=1; //Make UART RX pin input TRISCbits.TRISC6=0; //Make UART TX pin output SPBRGH = 0x02; //9600bps 20MHz Osc SPBRG = 0x08; RCSTAbits.CREN=1; //1 = Enables receiver RCSTAbits.SPEN=1; //1 = Serial port enabled (configures RX/DT and TX/CK pins as serial port pins) BAUDCONbits.BRG16=1;//1 = 16-bit Baud Rate Generator – SPBRGH and SPBRG TXSTAbits.SYNC=0; //0 = Asynchronous mode TXSTAbits.BRGH=1; //1 = High speed TXSTAbits.TXEN=1; //1 = Transmit enabled RCONbits.IPEN = 1; //enable Interrupt priority levels IPR1bits.RCIP=0; // EUSART Receive Interrupt Priority 0 = Low priority PIE1bits.RCIE=1; // 1 = Enables the EUSART receive interrupt INTCONbits.GIEL = 1;//enable interrupts INTCONbits.GIEH = 1; } //---------------------------------------------------------------------------- //---------------------------------------------------------------------------- void UART_putc(unsigned char c) { TXSTAbits.TXEN=0;// disable transmission TXREG=c; // load txreg with data TXSTAbits.TXEN=1; // enable transmission while(TXSTAbits.TRMT==0) // wait here till transmit complete { Nop(); } } </code></pre>
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