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In many cases, we want to display values for counters, sensors, and other debugging information. Although there is an LCD on the discovery kit, it can only display six characters, simultaneously. Fortunately, we have another nice option that uses the ST-Link V2.1 interface. This option does not require any extra hardware. You can see there is only one USB cable connected here. We are not using the other USB cable. The main function of ST-Link is to flash and debug the ARM processor through the mini-USB interface. In addition, ST-Link V2.1 also provides a USB virtual com port. This virtual-com port, also called UART port, allows PC and the discovery kit to exchange information via a terminal emulator. Lets take a look at the schematics. This is ST-Link V2.1. In fact, it is a Cortex-M0 processor. Lets pay attention to pin PA.2, PA.3. PA.3, ST-Link RX There are two possible connections. UART TX and MFX UART3 TX PA.2, ST-Link TX, There are two possible connections. MFX UART3 RX, UART R