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#define TXD_dir TRISF5_bit
#define RXD_dir TRISF4_bit

#define TXD LATF5_bit
#define RXD LATF4_bit

// LED signal
#define LED_Signal_dir TRISD1_bit
#define LED_Signal LATD1_bit

// global variables
unsigned char tempchar;

void UART2_Config(){
    TXD_dir = 0;                                                                // TXD direction
    RXD_dir = 1;                                                                // RXD direction
    TXD = 1;                                                                    // TXD pin
    RXD = 1;                                                                    // RXD pin

    U2STAbits.UTXEN = 1;          // 1 = UART transmitter enabled, UxTX pin controlled by UART (if UARTEN = 1); 0 = UART transmitter disabled
    U2MODEbits.LPBACK = 0;                                                      // 0 = Disable Loopback mode
    IFS1bits.U2RXIF = 0;                                                        // Clear the interrupt flag
    
    // Settings for Receive Interrupt priority
    IPC6bits.U2RXIP0 = 1;                                                       // Reference dsPIC30F Family Reference - Page 160/772
    IPC6bits.U2RXIP1 = 1;
    IPC6bits.U2RXIP2 = 1;
    
    // Settings for Receive Interrupt mode
    IEC1bits.U2RXIE = 1;                                                        // Enable UART2 receive interrupt
    U2STAbits.URXISEL1 = 0;                    // 0x :Interrupt flag bit is set when a character is received; Page 5/34 SEction34 UART-Part 2
    U2STAbits.URXISEL0 = 0;
    
    // Enable the UART module
    U2MODEbits.UARTEN = 1;                                                      // 1 = Enable UARTx; UARTx pins are controlled by UARTx module
}

void main() {

    ADPCFG = 0xFFFF;                                                            // Configure AN pins as digital I/O
    LED_Signal_dir = 0;
    UART2_Init_Advanced(9600,_UART_8BIT_NOPARITY,_UART_ONE_STOPBIT);
    Delay_ms(1000);                                                             // Wait for UART module to stabiliz
    UART2_Config();
    UART2_Write_Text("\r\n\nUART test 25 August 2023\r\n");
    while(1){
    }
}
void UART2_Interrupt() iv IVT_ADDR_U2RXINTERRUPT ics ICS_AUTO{
    IFS1bits.U2RXIF = 0;                                                        // Clear the interrupt flag
    LED_Signal = ~LED_Signal;                                                   // toggle LED each character
    if(U2STAbits.OERR == 1){
        U1STAbits.OERR = 0;                                                     // Clear Overrun Error to receive data
    }
    tempchar = UART2_Read();                                                    // one character from buffer
    UART2_Write_Text("CONNECTED");                                                      // echo to terminal
}