This is an old revision of the document!
Project details
| Name: | GECKOxsimple | |
|---|---|---|
| Maintainer | andreas.habegger<AT>bfh.ch | |
| Revision: | 10.03.2011 | |
| Development status: | stable | |
| Compatibility: | GECKO3 / GECKO4 | |
GECKOxsimple
The GECKOxsimple platform is a small, GECKO size power board. It contains a DC/DC converter to produce the 3.3V and a RS232 UART connection. The UART includes a level converter.
Power supply
The supply is based on the PT78ST133 from Texas Insturments. This 1.5 Amp Step-Down regulator can handle voltages from 9V to 26V. Datasheet: PT78ST133
RS232 UART
The UART has a MAX3232CSE (Datasheet) level converter. The Tx and Rx lines are visualized over 2 LED. They flash up while transmitting data. The CTS and RTS lines are also implemented.
All connections to the GECKOxmain are on GPIO1.
| Pin | Name | Direction | GECKO3 | GECKO4 |
|---|---|---|---|---|
| GPIO1_40 | Tx | IN | K23 | M24 |
| GPIO1_41 | Rx | OUT | K25 | M21 |
| GPIO1_44 | RTS | IN | J23 | K24 |
| GPIO1_45 | CTS | OUT | J22 | L21 |
UCF
To connect the GECKOxsimple with a uartlite-IP, only the Rx and Tx ports are needed.
The UCF Lines for GECKO3 could look similar to this:
NET “xps_uartlite_0_RX_pin” LOC = “K23” | IOSTANDARD = LVCMOS33; # GPIO1_40 TxD0 RS232 on GECKO4simple
NET “xps_uartlite_0_TX_pin” LOC = “K25” | IOSTANDARD = LVCMOS33; # GPIO1_41 TxD0 RS232 on GECKO4simple
The UCF Lines for GECKO4 could look similar to this:
NET “xps_uartlite_0_RX_pin” LOC = “M24” | IOSTANDARD = LVCMOS33; # GPIO1_40 TxD0 RS232 on GECKO4simple
NET “xps_uartlite_0_TX_pin” LOC = “M21” | IOSTANDARD = LVCMOS33; # GPIO1_41 TxD0 RS232 on GECKO4simple