Step 1. Type in the following program in a text editor like notepad and save it as hello.c.

#include <nuttx/config.h>
#include <stdio.h>

int app_main(int argc, char *argv[])
{
        printf("Hello, World!!\n");
        return 0;
}

Step 2. Open a DOS box, switch to the folder containing the C file and compile it using the following command.

> nuttx-config.bat zkit-arm-1769
> arm-none-eabi-gcc hello.c %NUTTX_CFLAGS% %NUTTX_LDFLAGS% -o hello.elf
> arm-none-eabi-objcopy hello.elf --target=ihex hello.hex

Step 3. Fix the errors, if any and check the folder for the executable file hello.hex.

Step 4. Connect the development kit to the PC, through the USB-UART mini connector. Press the PROG button, to switch into Programming Mode. (PROG LED On)

Step 5. Open Flash Magic,select the following parameters in the Flash Magic window, under Communications section.

Figure 2.1. Download using Flash Magic

Step 5. Select the Erase block used by Hex File check box, under the Erase section.

Step 6. Select the hex file generated in Step 3, under the Hex File section.

Step 7. Click on the start button to download the hex file, on to the micro-controller.

Figure 2.2. Download using Flash Magic

Step 8. Press the PROG button, to switch into Serial Communication Mode. (PROG LED Off)

Open Termite, serial terminal program and configure 115200 baudrate, 8 data bits, no parity, 1 stop bit.

Figure 2.3. Serial port settings

Press the RESET button, to execute the downloaded program. The "Hello World" message should get displayed on the serial terminal.

Figure 2.4. Termite output