1

Create a Project

Create a new project and select thePIC16F1619 along with theCuriosity board andMPLAB XC8.

2

Launch MCC

Open MCC under theTools > Embedded menu ofMPLAB X IDE.

3

System Setup

FromProject Resources, chooseSystem Module to open theSystem Setup window within MCC.

1. In the clock settings, make sure you selectINTOSC.
2. Select the system clockFOSC.
3. Set Internal Clock to4MHz_HF setting.
4. Check thePLL Enabled box.
5. The Curiosity board uses a Programmer/Debugger On-Board (PKOB) and uses a low voltage program method to program the MCU. Therefore, the low voltage programming must be enabled by checking theLow-voltage programming Enable box.

4

Timer4 Setup

Add the TMR4 peripheral to the project from theDevice Resources area of MCC. To do that, scroll down to the timer entry and expand the list by clicking on the arrow. Now, double click on theTMR4 entry to add it to theProject Resources list. Then, click onTMR4 to open the Timer4 configuration setup screen.

1. Check theEnable Timer box.
2. SelectClock Source FOSC/4,Postscaler 1:1, andPrescaler 1:64.
3. Set Timer Period value to9.088 ms.
4. Set External Reset Source toT4IN and Control Mode toRoll over pulse.
5. Set Start/Reset Option toSoftware Control (this will inhibit hardware reset of timer).
6. Check theEnable Timer Interrupt box.

To extend the Timer4 based delay, software overflows will use a callback function. The overflow of TMR4 will trigger an interrupt and the MCC generated TMR4 driver code will count up to the Callback Function Rate (CFR) value of events, before calling a predefined interrupt function that will then implement the ISR in themain.c file (that will be created in step 7).

To configure the callback value, enter "11" in the CFR field. This will give us about a 100 ms rate (11 × 9.088 ms = 99.968 ms).

5

Pin Module Setup

Click onPin Module in theProject Resources area. This will open up thePin Module and thePin Management Grid. Click on theRC5 Output row blue lock to turn it green.

Rename the I/O pin

In the Pin Module, rename the pin RC5 to "IO_LED_D7". Only theOutput box should be checked.

6

Generate Driver Code

Click onGenerate underProject Resources to have the MCC create the drivers and a basemain.c file for the project.

7

main.c

Themain.c file needs to be updated to handle the callback function using the function pointers generated by the MCC drivers. The function pointers allowmain.c to handle all operations without having to modify the driver code.

The first modification is to addvoid myTimer4ISR(void); right after the#include mcc_generated_files/mcc.h.

#include "mcc_generated_files/mcc.h"void myTimer4ISR(void);

This defines the name of the ISR that will be created to control the LED.

Now, the Timer4 driver default Interrupt Handler has to be connected to the ISR defined inmain.c.. This is handled by adding the lineTMR4_SetInterruptHandler (myTimer4ISR);, right after theSYSTEM_Initialize function.

// initialize the device    SYSTEM_Initialize();    TMR4_SetInterruptHandler (myTimer4ISR);  //Define interrupt Handler

Remove the double backslash comment markers from Global and Peripheral Interrupt Enable functions:
// INTERRUPT_GlobalInterruptEnable();
// INTERRUPT_PeripheralInterruptEnable();
This action will include a call to the predefined macros and enable interrupts.

// Enable the Global Interrupts    INTERRUPT_GlobalInterruptEnable();// Enable the Peripheral Interrupts    INTERRUPT_PeripheralInterruptEnable();

Finally, define what the ISR does when the number of callbacks is complete and the interrupt is processed. For this, a macro that was created in the MCC generatedpin_manager.h file is used. The macro selected will toggle the LED from off to on and on to off on each ISR call. Add themyTimer4ISR ISR after thewhile(1) loop. This will complete the modifications tomain.c required for this project.

    while (1)    {        // Add your application code    }}void myTimer4ISR(void){    IO_LED_D7_Toggle(); //Control LED}/** End of File*/

8

Build Project

Click onBuild Project icon to compile the code and you will see a "BUILD SUCCESSFUL" message in theOutput window of MPLAB X within several seconds of processing time.

BUILD SUCCESSFUL (total time: 8s)

9

Make sure your Curiosity board is connected to the USB port. Then, click on theMake and Program Device icon. This will build the project again and launch the programmer built into the Curiosity board. In theOutput window, you should see a series of messages and when successful, it will end with a "Programming and Verify Successful" message.

Output Window:

Connecting to MPLAB Starter Kit on Board...Currently loaded firmware on Starter Kit on BoardFirmware Suite Version.....01.41.07Firmware type..............Enhanced MidrangeTarget detectedDevice ID Revision = 2004The following memory area(s) will be programmed:program memory: start address = 0x0, end address = 0xbfconfiguration memoryProgramming...Programming/Verify complete