giobernardi

// DEVCFG2
#pragma config FPLLIDIV = DIV_2 // PLL Input Divider (1x Divider)
#pragma config FPLLMUL = MUL_20 // PLL Multiplier (24x Multiplier)
#pragma config UPLLIDIV = DIV_2 // USB PLL Input Divider (12x Divider)
#pragma config UPLLEN = OFF     // USB PLL Enable (Disabled and Bypassed)
#pragma config FPLLODIV = DIV_1 // System PLL Output Clock Divider (PLL Divide by 256)
// DEVCFG1
#pragma config FNOSC = PRIPLL    // Oscillator Selection Bits (Primary Osc w/PLL (XT+,HS+,EC+PLL))
#pragma config FSOSCEN = ON      // Secondary Oscillator Enable (Enabled)
#pragma config IESO = ON         // Internal/External Switch Over (Enabled)
#pragma config POSCMOD = HS      // Primary Oscillator Configuration (HS osc mode)
#pragma config OSCIOFNC = ON     // CLKO Output Signal Active on the OSCO Pin (Enabled)
#pragma config FPBDIV = DIV_8    // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/8)
#pragma config FCKSM = CSDCMD    // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)
#pragma config WDTPS = PS1048576 // Watchdog Timer Postscaler (1:1048576)
#pragma config FWDTEN = OFF      // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))
// DEVCFG0
#pragma config DEBUG = OFF       // Background Debugger Enable (Debugger is disabled)
#pragma config ICESEL = ICS_PGx2 // ICE/ICD Comm Channel Select (ICE EMUC2/EMUD2 pins shared with PGC2/PGD2)
#pragma config PWP = OFF         // Program Flash Write Protect (Disable)
#pragma config BWP = OFF         // Boot Flash Write Protect bit (Protection Disabled)
#pragma config CP = OFF          // Code Protect (Protection Disabled)

#include <p32xxxx.h>
#include <plib.h> // Include the PIC32 Peripheral Library.

#define SYSCLK 80000000L
#define DESIRED_BAUDRATE 9600
#define StatePOR 0x00
#define StateIDLE 0x01
#define StateSEND 0x02
#define StateWAITING 0x03

#define LED         LATDbits.LATD1
#define BUT         PORTDbits.RD11
#define UARTFLAG    LATDbits.LATD6
#define UARTEmpty   while (BusyUART1())

#include <xc.h>


char oldBtnIndex = 1;
char state = StateIDLE;
char data = 0;
char dataReceived = 0;
void SendChar(char toSend);
void initializeUART();
char CheckButton();


int main() {
    SYSTEMConfigPerformance(SYSCLK);
    initializeUART();
    INTEnableSystemMultiVectoredInt();
    TRISDbits.TRISD6 = 0; //UARTFLAG
    TRISDbits.TRISD1 = 0; //LED2
    TRISDbits.TRISD11 = 1; //BUTTON

    UARTFLAG = 0;
    LED = 1;
    while (1) {
        switch (state) {
            case StatePOR:
                state = StateIDLE;
                break;
            case StateIDLE:
                if(CheckButton() == 1){
                    SendChar('a');
                }
                if (dataReceived) {
                    dataReceived = 0;
                    state = StateSEND;
                    LED = 0;
                }
                break;
            case StateSEND:
                SendChar('a');
                state = StateIDLE;
                break;
            case StateWAITING:
                state = StateIDLE;
                break;
        }
    }
    return 0;
}

void __ISR(_UART1_VECTOR, ipl2) IntUart1Handler(void) {
    // Is this an RX interrupt?
    if (mU1RXGetIntFlag()) {
        // Clear the RX interrupt Flag
        mU1RXClearIntFlag();
        // Read data from Rx
        data = (char) ReadUART1();
        dataReceived = 1;
    }
    //chiama l'interrupt quando ha finito di trasmettere
    if (mU1TXGetIntFlag()) {
        mU1TXClearIntFlag();
        //sendRdy = 1;
    }
}

void SendChar(char toSend) {
    UARTFLAG = 1;
    putcUART1(toSend);
    while (BusyUART1());
    UARTFLAG = 0;
}

char CheckButton() {
    char temp = 0;
    if (oldBtnIndex & !BUT) {
        temp = 1;
    }
    oldBtnIndex = BUT;
    return temp;
}

void initializeUART() {
    // Optimize PIC32 performance and return peripheral bus frequency
    unsigned int pbClk = SYSTEMConfig(SYSCLK, SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);
    // Abilita UART1 and set baud rate to DESIRED_BAUDRATE=9600
    OpenUART1(UART_EN | UART_ODD_PAR_8BIT, UART_RX_ENABLE | UART_TX_ENABLE, pbClk / 16 / DESIRED_BAUDRATE - 1);
    // Configure UART1 RX Interrupt
    ConfigIntUART1(UART_INT_PR2 | UART_RX_INT_EN | UART_TX_INT_EN);
    while (BusyUART1());
}