School of Engineering DT2 Projekt-2: Baud Rate Generator & GPS Decoder.

Präsentation zum Thema: "School of Engineering DT2 Projekt-2: Baud Rate Generator & GPS Decoder."—  Präsentation transkript:

1 School of Engineering DT2 Projekt-2: Baud Rate Generator & GPS Decoder

2 School of Engineering GPS Uhr Überblick

3 School of Engineering GPS Uhr Minimum Features Uart-RX Unit GPS Decoder LCD Unit LCD Controller LCD Driver MaxII FPGA from GPS RX module to LCD Display

4 School of Engineering Sample Punkte des UART

5 School of Engineering uart_rx_in serial_in UART RX uart_rx_out rx_data(7:0) rx_data_valid Signal überabtasten Edge erkennen (Start Bits) Tick für Abtastung generieren Data Bits abtasten Buffer 1 Byte Byte am Decoder weitergeben

6 School of Engineering Abtasten des seriellen Datenstroms P edge TT + ½ T baud_tick 01234567Bit-Pointer

7 School of Engineering serial_in UART RX rx_data(7:0) rx_data_valid Edge Detector clock reset Tick Generator Data Abtaster

8 School of Engineering Baud Rate Generator Tick Generator Baud Rate Generator 50MHz Edge ResetBaud_tick

9 School of Engineering Taktteiler-Baud Rate Generator Load Value Load Value -1 Load Value -2 0 50MHz Edge Baud Counter Baud_tick Reload Value 0 1/4800s 1.5/4800 s

10 School of Engineering uart_rx_out rx_data(7:0) rx_data_valid GPS Decoder gps_time sec_einer(7:0) sec_zehner(7:0) min_einer(7:0) min_zehner(7:0) std_einer(7:0) std_zehner(7:0) Nach dem GPS Telegramm Header suchen Nur die Bytes mit der Zeitinformation abspeichern Zeitinformation an den Display Controller weitergeben

11 School of Engineering GPS Telegram Link: http://www.kowoma.de/gps/index.htmhttp://www.kowoma.de/gps/index.htm NMEA-0183 Protokoll : http://www.kowoma.de/gps/zusatzerklaerungen/NMEA.htmhttp://www.kowoma.de/gps/zusatzerklaerungen/NMEA.htm

12 School of Engineering ASCII Zeichensatz

13 School of Engineering idle 5 2 1 0, G P P $ !V !Valid V V V V V $ V & G V & P V & G V &, V & ! $ V & ! G GPS Decoder Statemachine

14 School of Engineering GPS Decoder 012345012345 UART_DATA sec_einer sec_zehner min_einer min_zehner std_einer std_zehner CLK VALID Time Register