IoTGateway/BSP/Android/Gettingstarted/How to use UART for rk
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Contents
Overview
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.
RS-485
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.
Boards
RSB4680 Borad
|
COM Name (EPC-R4680) |
HW Schematic (RSB-4680) |
Device Node |
Remark |
|---|---|---|---|
| N/A | UART0 | /dev/ttyS0 | for BT Data |
| COM5 | COM1 | /dev/ttyS1 | RS232 |
| COM1 | COM2 | /dev/ttyS2 | Debug Port/RS232 |
| COM6 | COM3 | /dev/ttyS3 | RS232 |
| COM2 | COM4 | /dev/ttyS4 | Supprot RSB485 |
| COM3 | COM6 | /dev/ttyUSB0 | Usb to Uart |
| COM4 | COM7 | /dev/ttyUSB1 | Usb to Uart |
