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General Purpose Input/Output Labs
3. Copy/paste the code in Example 3-25 into the main() over the code from the
previous lab to remove the Get_Inputs() .
EXAMPLE 3-25:
MAIN() CODE FOR GPIO LAB 6
Initialize(); //Initialize the relevant registers
while(1)
{
Decide();//Make any decisions
Do_Outputs(); //Perform any outputs
Timing();//Sets execution rate of the
//Software Control Loop
}
4. The remaining code remains unchanged from the previous lab. Compile the
project. There should be no errors.
3.4.5.4
TESTING THE APPLICATION
Program the PIC16F690. The application should behave as it did in the previous lab.
Only this time, the change in LED flashing direction should now be more responsive to
push button presses due to the interrupt added.
The solution for this project is located in the
C:\PICDEM_Lab\GPIO_Labs\GPIO_Lab6\solution directory .
3.4.6
3.4.6.1
Lab 7: Push Button Interrupt-on-Change
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. Interrupt-on-Change PORTA Register: IOCA (Register 4-6 in Section 4 of the
PIC16F690 Data Sheet).
- Configures PORTA associated pins that will generate an interrupt when a
change in voltage level is detected.
2. Interrupt Control Register: INTCON (Register 2-3 in Section 2 of the PIC16F690
Data Sheet)
- Enable interrupt functionality on the PIC16F690.
- Enables PORTA/PORTB change interrupts.
- Contains a flag that indicates that a PORTA or PORTB change interrupt has
occurred.
3.4.6.2
OVERVIEW
This lab adds a different kind of interrupt associated with the General Purpose
Input/Output peripheral called interrupt-on-change. Rather than simply interrupting the
CPU on a single edge transition on the RA2 pin, an interrupt will now occur on any edge
transition. Therefore, when the push button is pressed and/or released, an interrupt will
occur. This lab will use these concepts to shift the flashing LEDs from left-to-right while
the push button is pressed and from right-to-left when the push button is released.
Each PORTA and PORTB pin is individually configurable as an interrupt-on-change
pin. Control bits in the Interrupt-on-Change PORTA register (IOCA) enable or disable
the interrupt function for each pin.
? 2009 Microchip Technology Inc.
DS41369A-page 53
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