Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 95)

BSP Operations
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 95
For more information, see Chapter 4, GPIO, on page 69 .
The U-Boot provides several GPIO utility commands.
The parameters used in the GPIO utility commands are described below.
7.10 UART
There are a total of four universal asynchronous receiver/transmitters (UART) in the COMX-
P4080, each with Tx and Rx signals routed to the COM-E connectors. For more details, see
UART
on page 66 .
Table 7-4 GPIO Command Usage
Command Description
gpio dump Dumps the direction, od and level information for all pins
gpio get Gets the direction, od and level information for the specified pin
gpio set dir Sets the direction of the specified pin
gpio set dir Sets the od of the specified pin
gpio set dir Sets the level of the specified pin
- 0, 1, 2, 3, 4, 5, 6, 7, 18, 19, 20, 23, 24, 26
- 0 for input
1 for output
- 0 for output
1 for open drain
- 0 for low level
1 for high level