Difference between revisions of "How to use UART"
From ESS-WIKI
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== RSB4680 Borad == | == RSB4680 Borad == | ||
| − | {| | + | {| border="1" cellspacing="1" cellpadding="1" style="width:500px;" |
|- | |- | ||
| − | + | | style="width: 119px;" | <span style="color:#FF0000;">'''COM Name'''</span> | |
| − | + | | style="width: 123px;" | <span style="color:#FF0000;">'''Device Node'''</span> | |
| − | + | | style="width: 240px;" | <span style="color:#FF0000;">'''Remark'''</span> | |
| − | '''Remark''' | ||
| − | |||
|- | |- | ||
| − | | COM0 | + | | style="width: 119px;" | COM0 |
| − | | /dev/ttyS0<br/> | + | | style="width: 123px;" | /dev/ttyS0<br/> |
| − | | for BT Data<br/> | + | | style="width: 240px;" | for BT Data<br/> |
|- | |- | ||
| − | | COM1<br/> | + | | style="width: 119px;" | COM1<br/> |
| − | | /dev/ttyS1<br/> | + | | style="width: 123px;" | /dev/ttyS1<br/> |
| − | | <br/> | + | | style="width: 240px;" | <br/> |
|- | |- | ||
| − | | COM2<br/> | + | | style="width: 119px;" | COM2<br/> |
| − | | /dev/ttyS2<br/> | + | | style="width: 123px;" | /dev/ttyS2<br/> |
| − | | Debug Port<br/> | + | | style="width: 240px;" | Debug Port<br/> |
|- | |- | ||
| − | | COM3<br/> | + | | style="width: 119px;" | COM3<br/> |
| − | | /dev/ttyS3<br/> | + | | style="width: 123px;" | /dev/ttyS3<br/> |
| − | | <br/> | + | | style="width: 240px;" | <br/> |
|- | |- | ||
| − | | COM4<br/> | + | | style="width: 119px;" | COM4<br/> |
| − | | /dev/ttyS4<br/> | + | | style="width: 123px;" | /dev/ttyS4<br/> |
| − | | Supprot RSB485<br/> | + | | style="width: 240px;" | Supprot RSB485<br/> |
|- | |- | ||
| − | | COM5<br/> | + | | style="width: 119px;" | COM5<br/> |
| − | | /dev/ttyUSB0<br/> | + | | style="width: 123px;" | /dev/ttyUSB0<br/> |
| − | | Usb to Uart<br/> | + | | style="width: 240px;" | Usb to Uart<br/> |
|- | |- | ||
| − | | COM6<br/> | + | | style="width: 119px;" | COM6<br/> |
| − | | /dev/ttyUSB1<br/> | + | | style="width: 123px;" | /dev/ttyUSB1<br/> |
| − | | Usb to Uart | + | | style="width: 240px;" | |
| + | Usb to Uart | ||
| + | |||
|} | |} | ||
| Line 72: | Line 72: | ||
= = | = = | ||
| − | <span style="color:#FF0000;">'''Note : '''</span> | + | <span style="color:#FF0000;">'''Note : '''</span> |
1. COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using. | 1. COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using. | ||
Revision as of 11:23, 25 March 2019
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 | Device Node | Remark |
| COM0 | /dev/ttyS0 |
for BT Data |
| COM1 |
/dev/ttyS1 |
|
| COM2 |
/dev/ttyS2 |
Debug Port |
| COM3 |
/dev/ttyS3 |
|
| COM4 |
/dev/ttyS4 |
Supprot RSB485 |
| COM5 |
/dev/ttyUSB0 |
Usb to Uart |
| COM6 |
/dev/ttyUSB1 |
Usb to Uart |
Note :
1. COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using.
2.
Test uart
TBD