Overview
========
Hello World Virtual Com demonstrates the use of virtual com to print the "Hello World" string to the terminal.
Different with Hello World demo (a HW UART peripheral is used to transmit data), the demo transmits data based on
a serial port simulated by the USB device stack on target board side via USB peripheral.
The purpose of this demo is to demonstrate how to use virtual com and provide a simple project for debugging and further development.
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- Keil MDK 5.37
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Hardware requirements
=====================
- Two Micro USB cable
- EVK-MIMXRT1020 board
- Personal Computer
Board settings
==============
No special settings are required.
Prepare the Demo
================
1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board for downloading
the program and supply power for the board, connect another USB cable between host PC and USB port
on the target board.
2. Download the program to the target board.
3. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
4. Open a serial terminal(like putty) to communicate with the board via virtual com.
Running the demo
================
The log below shows the output of this demo in the terminal window:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello world.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Terminal will echo back the received characters.
Note:
To debug in qspiflash, following steps are needed:
1. Select the flash target and compile.
2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.
3. Start debugging in IDE.
- Keil: Click "Download (F8)" to program the image to qspiflash first then clicking "Start/Stop Debug Session (Ctrl+F5)" to start debugging.
Note:
When the USB serial port is emuerated and termial is opened, the printf has been executed, so the message cannot be displayed.
Please use putty,sscom and other terminal that support data caching replace it.
Yilin Sun
ec9dcda9ee
