AN3259

Application description

Doc ID 17835 Rev 1

7/25

3.3

Application principle

This application sets up a standard communication interface between the STM8S105C6T6

microcontroller and a terminal window running on a PC. Communications are performed

thanks to STM8S UART using the RS232 protocol. Both terminal window and UART must

be configured in the same way (see Appendix B: Configuring your terminal window).

This document only describes the communications and data processing from the STM8S

UART side. For more information about Windows HyperTerminal or similar software, refer to

3.3.1

Running the application

To run the application, perform the following steps:

1.

Launch and configure a terminal window on your PC (see Appendix B: Configuring

your terminal window for an example regarding Windows HyperTerminal).

2.

Compile and run the application firmware using the ST Visual Develop (STVD).

3.

Connect your PC to the STM8S-DISCOVERY through an RS232 cable.

4.

When the application has started, a menu is displayed on the Windows HyperTerminal

(Figure 2.: Terminal window menu). It allows to:

–

Switch LD1 on or off.

–

Configure LD1 blinking speed.

–

Enable/disable the beeper and select the beep frequency)

All the information displayed on this menu are sent by the STM8S microcontroller.

When a key is struck on the HyperTerminal, the corresponding ASCII value is sent to

the microcontroller and decoded.

Figure 2.

Terminal window menu