1 files changed, 78 insertions, 0 deletions
diff --git a/HW3.X/strap012_hw3prob3.c b/HW3.X/strap012_hw3prob3.c
new file mode 100644
index 0000000..259f101
--- /dev/null
+++ b/HW3.X/strap012_hw3prob3.c
@@ -0,0 +1,78 @@
+#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++;
+    }
+}