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#include <xc.h>
// PIC24FJ64GA002 Configuration Bit Settings
// CONFIG2
#pragma config POSCMOD = NONE // Primary Oscillator Select (Primary oscillator disabled)
#pragma config I2C1SEL = PRI // I2C1 Pin Location Select (Use default SCL1/SDA1 pins)
#pragma config IOL1WAY = OFF // IOLOCK Protection (IOLOCK may be changed via unlocking seq)
#pragma config OSCIOFNC = OFF // Primary Oscillator Output Function (OSC2/CLKO/RC15 functions as CLKO (FOSC/2))
#pragma config FCKSM = CSECME // Clock Switching and Monitor (Clock switching is enabled, Fail-Safe Clock Monitor is enabled)
#pragma config FNOSC = FRCPLL // Oscillator Select (Fast RC Oscillator with PLL module (FRCPLL))
#pragma config SOSCSEL = SOSC // Sec Oscillator Select (Default Secondary Oscillator (SOSC))
#pragma config WUTSEL = LEG // Wake-up timer Select (Legacy Wake-up Timer)
#pragma config IESO = ON // Internal External Switch Over Mode (IESO mode (Two-Speed Start-up) enabled)
// CONFIG1
#pragma config WDTPS = PS32768 // Watchdog Timer Postscaler (1:32,768)
#pragma config FWPSA = PR128 // WDT Prescaler (Prescaler ratio of 1:128)
#pragma config WINDIS = ON // Watchdog Timer Window (Standard Watchdog Timer enabled,(Windowed-mode is disabled))
#pragma config FWDTEN = OFF // Watchdog Timer Enable (Watchdog Timer is disabled)
#pragma config ICS = PGx1 // Comm Channel Select (Emulator EMUC1/EMUD1 pins are shared with PGC1/PGD1)
#pragma config GWRP = OFF // General Code Segment Write Protect (Writes to program memory are allowed)
#pragma config GCP = OFF // General Code Segment Code Protect (Code protection is disabled)
#pragma config JTAGEN = OFF // JTAG Port Enable (JTAG port is disabled)
// To test: Window > Simulator > Stimulus. Click on the Pin / Register Actions.
// Click on the top row where it says "Click here to add/remove signals", and add IC1
// (or RB6). Add entries that change the signal to 1 at time 1000, to zero at 1100, and so on.
// You may want to check the checkbox that says "Repeat from action".
volatile unsigned int dutyCycle = 0; // positive or negative
void __attribute__((__interrupt__,__auto_psv__)) _IC1Interrupt(void)
{
static unsigned int last = 0;
unsigned int current;
_IC1IF = 0;
current = IC1BUF;
if (current > last)
dutyCycle = current - last;
else
// dutyCycle = ((long)(1<<16) + current) - last;
dutyCycle = ((long)(PR3+1) + current) - last;
last = current;
}
void setup()
{
CLKDIVbits.RCDIV = 0;
AD1PCFG = 0x9fff; // For digital I/O. If you want to use analog, you'll
// need to change this.
_TRISB6 = 1;
__builtin_write_OSCCONL(OSCCON & 0xbf); // unlock PPS
_IC1R = 6 ; //IC! <- RB6; See Table 10-2 on P108 of the datasheet
__builtin_write_OSCCONL(OSCCON | 0x40); // lock PPS
T3CON = 0;
PR3 = 65535;
TMR3 = 0;
_T3IF = 0;
T3CON = 0x8000;
IC1CON = 1; // every edge
_IC1IF = 0;
_IC1IE = 1;
}
int main(void)
{
int count=0;
setup();
while (1){
count++;
}
}
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