LOGSYS Development Environment of Embedded Systems

1. LOGSYSDevelopment Environment of Embedded Systems Tamás Raikovich Béla Fehér Péter Laczkó Budapest University of Technology and Economics Department of Measurement and Information Systems

2. Contents • General characteristics of embedded systems • Using programmable devices • LOGSYS development environment: • Configuration of programmable devices • Communication capabilities • Power supply and monitoring • User interface LOGSYS - Raikovich, Fehér, Laczkó

3. Embedded systems • Small size, limited power consumption • Extensive connection with the environment→ communication • Special, various functionality • Typically implemented with programmable devices: • Microprocessor, microcontroller • FPGA • Etc. • Development of the prototype is (usually) expensive. LOGSYS - Raikovich, Fehér, Laczkó

4. Using programmable devices • On-board components: • Microprocessors, microcontrollers • CPLDs, FPGAs • Serial EEPROM and FLASH • Programming interfaces: • Standard solutions: JTAG, SPI, I2C • Vendor specific solutions: • Microchip PIC: ICD port • Atmel AVR: DebugWire • ARM: SWD (Serial Wire Debug) • Custom JTAG LOGSYS - Raikovich, Fehér, Laczkó

5. Using programmable devices • Programming support: • JTAG: • SVF: simple, can be generated in most development environments • STAPL: more complicated, loops, procedures • SPI: Intel HEX • I2C: Intel HEX • SVF (Serial Vector Format) files: • Simple text file format • Industry standard • Describes the operations on the JTAG chain • Example: reading the device ID code //Created using Xilinx iMPACT Software [ISE Foundation - 7.1.04i]TRST OFF;ENDIR IDLE;ENDDR IDLE;STATE RESET IDLE;FREQUENCY 1E6 HZ;//Loading device with 'idcode' instruction.SIR 6 TDI (09) SMASK (3f) ;SDR 32 TDI (00000000) SMASK (ffffffff) TDO (f1414093) MASK (0fffffff) ; LOGSYS - Raikovich, Fehér, Laczkó

6. Manufacturer development tools • Manufacturer development tools: • Focus on their own devices. • Offer only a limited communication support. • Power supply is usually left to external instruments. • For that reason, the LOGSYS development environment has been created, which integrates the following features: • Configuration • Communication • Power supply LOGSYS - Raikovich, Fehér, Laczkó

7. LOGSYS environment User application • LOGSYS development port: • Configuration interface • Communication interface • Power supply USB port Development cable Target system LOGSYS - Raikovich, Fehér, Laczkó

8. LOGSYS development cable • Full support: • JTAG interface for configuring the target system • Clock and reset signals for operating the target system • Serial input and output signals for communication • 5V short circuit protected power output with adjustable current limit (450mA, 700mA, 950mA) • Voltage and current measurement LOGSYS - Raikovich, Fehér, Laczkó

9. LOGSYS development cable • Supported communication modes: • UART / USRT • BitBang I/O • Master SPI • Master I2C (TWI, SMBus) • Different target systems can use different voltages for communication → level shifters (Vref JTAG, Vref I/O). • This enables the cable to be easily attached to many target systems. LOGSYS - Raikovich, Fehér, Laczkó

10. LOGSYS development cable • Specification: • JTAG: fTCK = 1 MHz • UART / USRT: 4800 – 115200 bit/s • BitBang I/O: fCLK = 1 – 1000 Hz • Master SPI: fCLK = 2 kHz – 8 MHz • Master I2C: fSCL = 1 – 400 kHz • Reference voltages: 1.65 – 5 V LOGSYS - Raikovich, Fehér, Laczkó

11. User application • Integrated development environment. • Customizable user interface (docking windows). LOGSYS - Raikovich, Fehér, Laczkó

12. User application • Cable browser: • Displays the connected cables. • Displays the available functions. • Power panel: • Power output control. • Output current limit control. • Measurement results: • Output and refererence voltages • Output current LOGSYS - Raikovich, Fehér, Laczkó

13. User application - Configuration • Native configuration interface: JTAG interface. • The LOGSYS system uses the industry standard SVF files (Serial Vector Format). • In case of Xilinx devices, BIT and JEDEC files are also directly supported. • Easily handles JTAG chains with devices from different manufacturers. LOGSYS - Raikovich, Fehér, Laczkó

14. User application - Configuration • Handling JTAG chains with devices from different manufacturers: • Device 1: Atmel ATmega128 microcontroller (AVR Studio 4) • Device 2: Xilinx XC9536 CPLD (iMPACT) XC9536 ATmega128 LOGSYS - Raikovich, Fehér, Laczkó

15. User application - Configuration • Handling composite JTAG chains: • Atmel AVR Studio 4: necessary data have to be entered manually. Devices before and after Instruction bits before and after LOGSYS - Raikovich, Fehér, Laczkó

16. User application - Configuration • Handling composite JTAG chains: • Xilinx iMPACT: necessary data is imported from BSDL files (Boundary Scan Description Language). LOGSYS - Raikovich, Fehér, Laczkó

17. User application - Configuration • The LOGSYS configuration tool has an internal device database to manage composite JTAG chains. • The required data can be entered manually or can be imported from BSDL files: • Device instruction register length • Device identification code LOGSYS - Raikovich, Fehér, Laczkó

18. User application - Configuration • Thanks to the JTAG device database, the composite JTAG chains can be handled without any difficulties: • Query the devices in the JTAG chain • Select the device to configure • Select the configuration file • The application configures the selected device LOGSYS - Raikovich, Fehér, Laczkó

19. User application - Communication • Basically, the UART can be used to communicate with the embedded system: • Most target systems have UART • Application level communication • Virtual serial port driver → UART of the development cable can be accessed from Windows applications. LOGSYS - Raikovich, Fehér, Laczkó

20. User application - Communication • A simple terminal interface is available in the application for UART/USRT communication: • Adjustable parameters: baud rate, start & stop bits, parity, etc. • File I/O operations • In USRT mode the development cable drives the clock output and fCLK = baud rate. LOGSYS - Raikovich, Fehér, Laczkó

21. User application - Communication • BitBang I/O: special communication mode for simple tests and educational purposes. • In this mode, the software: • Directly controls the clock • At every rising or falling clock edge: • Can change the MOSI and the RESET lines • Samples the MISO line LOGSYS - Raikovich, Fehér, Laczkó

22. User application - Communication • The interface provides rich controlling capabilities: • Clock: free run, step, adjustable frequency. • Data I/O: adjustable clock edge, different number systems,file I/O operations. • Timing-diagram: zoomable, scrollable. LOGSYS - Raikovich, Fehér, Laczkó

23. External applications • User interface for SPI and I2C is device dependent: • EEPROM, FLASH • I/O expanders • A/D, D/A • Etc. • Standalone applications: • SPI: • FLASH programmer • simple terminal interface • I2C: • EEPROM programmer • simple terminal interface • These applications will be integrated into the LOGSYS development environment. LOGSYS - Raikovich, Fehér, Laczkó

24. External applications • Cable server application for Xilinx iMPACT • Accessing the configuration interface of the development cable from Xilinx iMPACT: • Start the cable server application • Configure the cable connection in iMPACT: remote cable • iMPACT can use the JTAG interface LOGSYS - Raikovich, Fehér, Laczkó

25. Summary • General purpose configuration and development tool. • Functions: • Configuration of target systems. • Communication and test capabilities. • Power supply and measurement. • Supports the manufacturer development environments. • Integrated, user-friendly interface. LOGSYS - Raikovich, Fehér, Laczkó

26. Questions?

27. Thank you for your attention!