PL216043B1 - Debuger- programmer of microcontrollers - Google Patents

Description

The subject of the invention is a debugger - a microcontroller programmer, designed for debugging and programming microcontrollers via a serial interface.

The programmer circuit manufactured by the Renesas company is known. This programmer is connected on one side to the PC computer through one COM port, and on the other side to the programmed / debugged microcontroller. In the case of this device, if debugging is performed after programming the microcontroller, close the programming application and start the debugging application because both use the same COM port. You can also open programming and debugging applications on two different COM ports, but then it is necessary to move the cable connecting the PC with the UFPC system from one COM port to the other. Both situations are very troublesome when starting a new microcontroller system, when it is necessary to reprogram very often.

The debugger-programmer according to the invention, equipped with a PC computer, consisting of a programmer connected to a microcontroller, is devoid of these inconveniences, the programmer input is connected to a monostable multivibrator connected by a voltage matching circuit coupled with the computer port, the second port of which is coupled with lines by a matching circuit voltages with the multiplexer connected by lines to the microcontroller.

The subject of the invention is presented on the drawing showing the debugger-programmer circuit.

Debugger - the programmer is equipped with a PC computer and consists of a PR programmer connected by FWE and RS lines to a microcontroller, while the PR programmer input is connected to a MM monostable multivibrator connected through a DPN1 voltage matching circuit coupled with RXD1 and TXD1 lines with the COM1 port of the PC computer, the second COM2 port is coupled with the lines RXD2 and TXD2 through the voltage matching circuit DPN2 with the MP multiplexer connected with the lines TXD and RXD with the microcontroller.

In the system according to the invention, there is no need to transfer the wires from one COM1 port of the PC to the other COM2 port, or to alternately open and close applications for programming and communication with the microcontroller working on the same COM port of the PC. The programmer-debugger circuit is transparent to serial transmission in both debugging and programming modes. In the normal state, the physical port of the microcontroller is connected via the MP multiplexer to the COM2 port of the PC computer. A PC computer, through an appropriate application (e.g. a terminal application), can exchange data with an operating microcontroller. You can debug this way. The application should run on this COM2 port of the PC.

If you need to replace the microcontroller software - which happens very often when starting the system - it is enough to start the programming process from the second programming application, working on the COM1 port. The system, after detecting activity on the TXD1 line - starting programming - automatically switches the physical serial port of the microcontroller from the COM2-terminal / debugging port - to the COM1 - programming port. The PR programmer simultaneously puts the microcontroller into the programming mode by issuing appropriate logic levels on the FWE line or lines - write permission - and generating the RESET signal on the RS line. After the programming and possible verification is completed - the PC computer's TXD1 line ceases to operate - the FWE lines return to their original state and the RESET signal is automatically generated on the RS line, which introduces the microcontroller to the normal operation mode. The serial port of the microcontroller is automatically switched from the COM1 port - programming port to the COM2 port - terminal / debugging port, and it is possible to re-debug or exchange data between the PC and the microcontroller.

Claims (1)

Debugger - microcontroller programmer, designed for debugging and programming microcontrollers via a serial interface, equipped with a PC, characterized by the fact that it consists of a programmer (PR) connected by lines (FWE) and (RS) with a microcontroller, the programmer input (PR ) is connected to a monostable multivibrator (MM) connected via PL 216 043 B1 voltage matching circuit (DPN1) coupled with lines (RXD1) and (TXD1) with the port (COM1) of the computer (PC), the second port (COM2) of which is coupled with lines (RXD2) and (TXD2) through the voltage matching circuit ( DPN2) with a multiplexer (MP) connected by lines (TPD) and (RXD) with a microcontroller.