S B C X U s e r ' s G u i d e
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5.3
UARTs
Three UART ports are available on SBCX.
5.3.1
UART3 – J22
Fig. 13: Debug console connector
J22 is a 10 pin (5x2x2.54mm) header connector for the RS232 two-wires
UART3 port, used for debug purposes (bootloader and operating system
serial console).
The following table describes the interface signals:
Pin #
SOM pin #
Pin name
Function
Notes
1, 2, 4, 6,
7, 8, 10
-
N.A.
N.C.
Not connected
3
J1.189
RS232_RX
Receive line
5
J1.187
RS232_TX
Transmit line
9
-
DGND
Ground
5.3.1.1
Accessing the peripheral
UART3 is mapped to
/dev/ttymxc2
device in Linux. The peripheral is
used as the default serial console, both for the bootloader and the kernel.
To connect to the debug serial port:
1.
connect the DB9 adapter bracket to the J22 connector on the
SBCX board
2.
connect a serial cable between DB9 connector and PC COM
port through a NULL-modem cable (not provided)
December, 2019
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Содержание SBC AXEL
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