View source for IoTGateway/BSP/Android/Gettingstarted/How to use UART for rk


= <span style="color: rgb(0, 0, 205)">'''<span style="font-size: large">Overview</span>'''</span> =

<span lang="en"><font color="#000000">The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UART driver on different board.</font></span>

== <span style="font-size: medium"><font color="#0066cc">RS-485</font></span> ==

RS-485 uses half-duplex communication, which means that one medium is shared for transmitting and receiving data. Therefore the system needs to control the RS-485 transceiver's transmit mode. Usually the UART RTS signal is used to switch the transmitter on and off.

= '''<span style="font-size: large"><span style="color: rgb(0, 0, 205)">Boards</span></span>''' =

== RSB4680 Borad ==

{| align="left" border="1" cellpadding="1" cellspacing="1" style="width: 500px"
|-
! scope="col" | 
COM Name

(EPC-R4680)

! scope="col" | 
'''HW Schematic'''

'''(RSB-4680)'''

! scope="col" | '''Device Node'''
! scope="col" | 
'''Remark'''

|-
| style="text-align: center" | N/A
| style="text-align: center" | UART0
| style="text-align: center" | /dev/ttyS0
| for BT Data
|-
| style="text-align: center" | COM5
| style="text-align: center" | COM1
| style="text-align: center" | /dev/ttyS1
| RS232
|-
| style="text-align: center" | COM1
| style="text-align: center" | COM2
| style="text-align: center" | /dev/ttyS2
| Debug Port/RS232
|-
| style="text-align: center" | COM6
| style="text-align: center" | COM3
| style="text-align: center" | /dev/ttyS3
| RS232
|-
| style="text-align: center" | COM2
| style="text-align: center" | COM4
| style="text-align: center" | /dev/ttyS4
| Supprot RSB485
|-
| style="text-align: center" | COM3
| style="text-align: center" | COM6
| style="text-align: center" | /dev/ttyUSB0
| Usb to Uart
|-
| style="text-align: center" | COM4
| style="text-align: center" | COM7
| style="text-align: center" | /dev/ttyUSB1
| Usb to Uart
|}

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[[File:RS232andRS485Jumper.PNG|RTENOTITLE]]