4.1 Adding the Non-Secure Application Logic

To develop and run the application, follow these steps:

Open the main.c file of the Non-Secure project (tz_pic32cm_ls00_cnano.X) and add the following code after the SYS_Initialize():
```
SYSTICK_TimerStart();
```
Inside the while loop, add the following code to toggle the LED at a default rate of 500 ms:
```
LED_Toggle();
SYSTICK_DelayMs(500);
```
Go to the Non-Secure Project Properties, and enter the post-build command for generating a Non-Secure firmware genuine copy:
1. In the MPLAB X IDE Project Properties window perform these actions.
2. Under the left Categories section, select Building and in the right Configuration properties page, select the Execute this line after build check box.
3. Enter the following post command below the check box.
```
rm -rf ${ProjectDir}/../../hex && mkdir ${ProjectDir}/../../hex&& cp 
${ProjectDir}/${ImageDir}/*.hex ${ProjectDir}/../../hex && 
${MP_CC_DIR}"/xc32-objcopy" -I ihex -O binary 
${DISTDIR}/${PROJECTNAME}.${IMAGE_TYPE}.hex 
${DISTDIR}/${PROJECTNAME}.${IMAGE_TYPE}.bin && cp 
${ProjectDir}/${ImageDir}/*.bin ${ProjectDir}/../../hex
```
Figure 4-1. Generating The Non-Secure Firmware Genuine Copy
Click Apply, and then click OK.
Under Projects, right-click on the tz_pic32cm_ls00_cnano and then select Set as Main Project.
Figure 4-2. Make the Non-Secure Project as Main Project
Build the project by clicking the Clean and Build icon or by selecting Clean and Build Main Project from the drop-down list and verify that the project builds successfully.
Figure 4-3. Clean and Build
Check if the binary file of the Non-Secure project is available in the hex folder location (path: D:/software_attack_protection/hex).
Figure 4-4. Location of Generated Binary File
Open the command prompt and navigate to the following location.
Path: <Harmony folder path>/ bootloader/tools
Note: If the bootloader folder is not found inside the Harmony folder, download the bootloader package (v3.7.0 or above) using the MPLAB Content Manager.
Run the python script btl_bin_to_c_array.py to convert the Non-Secure application binary file to a C-style array containing Hex output.
```
python btl_bin_to_c_array.py -b D:\software_attack_protection\hex\tz_pic32cm_ls00_cnano.X.production.bin -o 
D:\software_attack_protection\firmware_secure\src\non_secure_app_image_pic32cm_ls00_cnano.h -d PIC32CM
```
Figure 4-5. Running the Python Script
Once the script is successfully executed, a header file of the Non-Secure Application Image (Genuine Copy) is found in the source folder of the Secure Project.
Figure 4-6. Genuine Copy of the Non-Secure Application Image