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Demonstration Program Operation
3.4
DEMONSTRATION CODE OPERATION
The following sections describe in more detail how the demonstration programs
interact with and take advantage of key dsPIC DSC, DSP and peripheral features. Full
details on the peripheral functionality and associated tasks are presented later in this
document.
3.4.1
Interrupt Processing
The demonstration code samples switches S1 and S2 and uses their status to operate
the LEDs associated with processor ports RD4 and RD5, respectively. If S1 is pressed,
it sets program flag “ LED1on ”. If S1 is pressed again, it resets program flag LED1on.
Similarly, if S2 is pressed, it toggles program flag LED2on .
Another interrupt routine checks flags LED1on and LED2on every 500 milliseconds. If
the LED1on is true, the LED labeled RD4 is toggled on and off every 0.5 seconds,
causing the LED to blink. If LED1on is not true, the LED remains off.
This demo program is illustrated in Figure 3-1.
FIGURE 3-1:
INTERRUPT PROCESSING FLOW DIAGRAM
START
INIT TIMER 1
For 0.5 Sec Interval
S1 Pressed?
Yes
LED1on = LED1on
S1 Released?
No
No
Yes
S2 Pressed?
Yes
LED2on = LED2on
S2 Released?
No
No
Start of 0.5 sec
Timer1 Init
Yes
? 2006 Microchip Technology Inc.
LED1on Flag Set?
No
Turn RD4 Off
LED2on Flag Set?
No
Turn RD5 Off
Return
Yes
Yes
RD4 = RD4
RD5 = RD5
DS51584B-page 27
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