Chapter 9: Breakout Board
GPIO Devices
132
Psion Teklogix Omnii HDK User Manual
9.6
GPIO Devices
This section describes how to configure the breakout board to connect to and test GPIO (General
Purpose Input/Output) devices.
9.6.1
GPIO Power
Power for GPIO devices is provided by the VSYS power from Omnii. Power converters on the
breakout board split the VSYS power into 3.3 V (HDK_3V3) and 5 V (HDK_5V0) lines.
The GPIO features on the breakout board require power from both the 3.3 V and 5 V lines. To
enable these power lines, install jumpers across the pins of jumper headers J38, J3 and J37 (see
Section 9.5: “Power Configuration” for more details).
9.6.2
GPIO Data Pins
The expansion ports on Omnii use common data pins for connecting to GPIO, RS-232 / UART
and SPI devices. In addition to configuring the pins on Omnii for the specific type of device being
attached to the expansion port (see
PinFunctions
registry entry in Section 4.4.1 on page 26), the
breakout board must also be configured to direct the data pins to the correct header. To configure
the data pins on the breakout board for a GPIO device, set the following jumpers as indicated:
Table 9.4 GPIO Jumper Settings
Jumper
Pins
Function
J16
2-3
UART_TXD & RS-232 TXD /
SPI INT & GPIO_0
J17
2-3
UART_RXD & RS-232 RXD /
GPIO_1
J18
2-3
UART_CTS & RS-232_CTS /
GPIO_2
J19
2-3
UART_RTS & RS-232_RTS /
GPIO_3
J24
2-3
SPI_MOSI /
RS-232 RI & GPIO_4
J25
2-3
SPI_MISO /
RS-232_DCD & GPIO_5
J26
2-3
SPI_SCLK /
RS-232_DSR & GPIO_6
J27
2-3
SPI_CS_N /
RS-232_DTR & GPIO_7
J41
2-3
SPI INT /
GPIO_0
J43
1-2
GPIO_4
/ RS-232_RI
J44
1-2
GPIO_5
/ RS-232_DCD
J45
1-2
GPIO_6
/ RS-232_DSR
J46
1-2
GPIO_7
/ RS-232_DTR
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