Lab 1. Simple Digital Input/Output (I/O)

Ensure you are running the VS Code profile created in Lab 0 (MCHP Dev).

Run the MPLAB Create New Project command (Ctrl + Shift + P) and create a new project called "lab1".

Perform a build of this project (Ctrl + Shift + B), and verify a successful build:

Create a new launch.json file:

1. Navigate to the Run and Debug button located on the left sidebar, or use the shortcut Ctrl + Shift + D.
2. Click on the create a launch.json file link.

Select MPLAB Debugger from the pull-down and press Enter. (If you have multiple debuggers, you can filter them by typing "MPLAB".)

Once done, you will have a launch.json file under the .vscode folder with a pre-populated Debug Configuration:

Perform the following updates:

• edit the "name" property as shown here:
  • "name": "Debug Project"
• add a "properties" property as shown here:
  • "properties": {"debugoptions.useswbreakpoints": "false"}

The updated "Debug Project" launch configuration should be as shown here:

Press the Add Configuration button.

Select the MPLAB: Program option from the pull-down:

You will now see a programming configuration in the launch.json file:

Perform the following updates:

• edit the "name" property as shown here:
  • "name": "Program Project"
• add a "preLaunchTask" property as shown here:

The updated "Program Project" launch configuration should be as shown here:

Open main.c and replace the default application code with the following contents (copy/paste):

/* * File: main.c * Project: lab1 * * Description: * * Initializes pin RF0 for sensing switch S2 input, and pin RD9 to drive the * Red RGB LED output. The main loop will then simply read the switch level * continuously, and set the LED output HIGH when pressed, and LOW when released. * */ #include <xc.h> #define FCPU 8000000U #define FPB_FAST FCPU #define FPB_STD FCPU/2 #define FPB_SLO FCPU/4 #pragma config FWDT_WDTEN = SW void clocksInit(void); void pinsInit(void); int main(void) { INTCON1bits.GIE = 0; // prevents interrupt flooding since reset state is a '1' clocksInit(); // initialize all clocks pinsInit(); // initialize all pins INTCON1bits.GIE = 1; // enable global interrupts while(1) { if(PORTFbits.RF0) { // S2 is not pressed LATDbits.LATD9 = 0; } else { // S2 is pressed LATDbits.LATD9 = 1; } } } void clocksInit(void) { /*** System Clocks Initialization ***/ // The FRC provides the source clock // Instruction Clock, Fcpu = 8 MHz // Peripheral Bus Clocks: Fpb_fast = 8 MHz, Fpb_std = 4 MHz, Fpb_slow = 2 MHz // Clock settings left at defaults listed above } void pinsInit(void) { /*** I/O Pin Function Initialization ***/ // Initialize RGB Red LED pin LATDbits.LATD9 = 0; // initialize output level TRISDbits.TRISD9 = 0; // make pin digital output // Initialize Switch S2 input ANSELFbits.ANSELF0 = 0; // disable analog function TRISFbits.TRISF0 = 1; // make pin digital input }

Press Ctrl + Shift + B to build the project. Fix any syntax errors, ensuring that the project builds successfully

Connect the dsPIC33A Curiosity Platform Development Board with dsPIC33AK512MPS512 Dual In‑line Module (DIM) to your computer using the USB cable. Verify that the green led (power) is on and that the tool appears in the Tools view (click on the MPLAB icon in the left column or use command MPLAB: Show Tools view): 

Start the configured debug session.

Launch the debug configuration by using the keyboard shortcut F5, or navigate to Run and Debug and selecting "Debug Project":

When asked to select a tool, select Curiosity/Starter Kits (PKOB4): 

If the launch is successful, the program will break at the start of main:

Run Control.

Use the keyboard shortcut F5 to continue, or press the Continue control icon to run the program:

When running, the application should turn on the red RGB LED when switch S2 is PRESSED:

Once you have an active debug session, you can use the run control icons to do stepping, restart, and pause:

The following keyboard shortcuts are also available:

Terminate the debug session.

Use the keyboard shortcut Shift + F5, or press the Stop control icon to terminate the debug session:

Start the configured program session.

Launch the program configuration by navigating to Run and Debug and selecting "Program Project":

Press the Play icon. If asked to select a tool, select Curiosity/Starter Kits (PKOB4): 

If the programming is successful, the Debug Console window will display the following messages:

When running, the application should turn on the red RGB LED when switch S2 is PRESSED: