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USB to Serial is a small tool often used for debugging microcontroller programs. The Jlink version V9 and above provides a virtual serial port function, which can be used for serial transmission and reception testing. The interface is defined as follows: pin 5 is Jlink-TX, and pin 17 is Jlink-RX. It is important to note that the virtual serial port can only be used in SWD mode because its pins conflict with JTAG.
The virtual serial port function of J-link is disabled by default and can be enabled in J-link Commander.
First, type f to confirm if the J-link version is V9 or above.
If it is V9 or above, type vcom enable.If the following prompt appears, it indicates that the configuration is successful; simply power cycle the Jlink.
If the following prompt appears: The connected probe does not support VCOM functionality, re-enter the following commands:
If unsuccessful, try powering on multiple times; J-link Commander must also be reopened..
If there are no error prompts, everything is normal. Power cycle the J-link, and you will see the driver reload. A new serial port device will appear in the device manager, indicating that the setup is successful.This serial port can be used directly as a USB to serial device without affecting J-link debugging.
If you need to disable this function, simply type vcom disable.
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