How to use UART for RK3399 RSB4710 - Revision history

Xingxing.li at 01:26, 11 May 2022

2022-05-11T01:26:04Z

Liszt.kao at 06:59, 1 November 2021

2021-11-01T06:59:51Z

Liszt.kao at 01:29, 13 October 2021

2021-10-13T01:29:45Z

Liszt.kao at 03:40, 29 September 2021

2021-09-29T03:40:22Z

Liszt.kao at 03:39, 29 September 2021

2021-09-29T03:39:08Z

Yanwei.cao at 08:48, 18 June 2020

2020-06-18T08:48:06Z

Yunjin.jiang at 01:54, 11 March 2020

2020-03-11T01:54:00Z

Yunjin.jiang at 02:56, 9 March 2020

2020-03-09T02:56:09Z

Yunjin.jiang: Created page with "= '''Overview''' = The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UAR..."

2020-02-14T06:33:57Z

Created page with "= '''Overview''' = The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UAR..."

New page

= '''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''' =

== RSB4710 Borad ==

{| border="1" cellspacing="1" cellpadding="1"
|-
| '''COM Name'''
| '''Device Node'''
| '''Remark'''
|-
| COM0
| /dev/ttyS0 
| for BT Data 
|-
| COM2 
| /dev/ttyS2 
| Debug Port 
|-
| COM4 
| /dev/ttyS4 
| support RS232, no flow control 
|-
| USB2COM0 
| /dev/ttyUSB0 
| support RS232 
|-
| USB2COM1
| /dev/ttyUSB1 
| support RS232 
|-
| USB2COM2 
| /dev/ttyUSB2
| support RS232 and RS485
|-
| USB2COM3 
| dev/ttyUSB3 
| support RS232 and RS485 
|}

'''Note : '''

1. Only COM4、USB2COM0、USB2COM1、USB2COM2、USB2COM3 are designed for custom using.

2. Only USB2COM2 and USB2COM3 support RSB485.

3. COM2 is designed as debug port default. 

= How to config RS232 or RS485 mode =

== Enter U-boot interrupt mode ==

Connect device to debug port, and open debug console. See more : [http://ess-wiki.advantech.com.tw/view/How_to_debug_for_RK3399_RSB4710 How_to_debug].

Press "ctrl + c" key before power up the device, until get the following information on debug console : 
<pre>Hit any key to stop autoboot: 0
=> <INTERRUPT>
=></pre>

Then you can input the following cammand to config UART mode.

== Config Uart Mode ==
<pre>setenv ttyUSB2 RS485
setenv ttyUSB3 RS485
saveenv
reset
</pre>

'''Note : '''

The default value is RS232.

@@ Line 1: / Line 1: @@
 = '''Overview''' =
@@ Line 15: / Line 16: @@
 == RSB4710 Borad ==
-{| border="1" cellspacing="1" cellpadding="1"
+{| border="1" cellpadding="1" cellspacing="1"
 |-
 | '''COM Name'''
@@ Line 22: / Line 23: @@
 |-
 | COM0
-| /dev/ttyS0<br/>
+| /dev/ttyS0
-| pull to M2 interface for BT using<br/>
+| pull to M2 interface for BT using
 |-
-| COM1<br/>
+| COM1
-| /dev/ttyS4<br/>
+| /dev/ttyS4
-| support RS232, no flow control<br/>
+| support RS232, no flow control
 |-
-| COM2<br/>
+| COM2
-| /dev/ttyS2<br/>
+| /dev/ttyS2
-| Debug Port<br/>
+| Debug Port
 |-
-| COM3<br/>
+| COM3
-| /dev/ttyUSB0<br/>
+| /dev/ttyUSB0
-| support RS232<br/>
+| support RS232
 |-
 | COM4
-| /dev/ttyUSB1<br/>
+| /dev/ttyUSB1
-| support RS232<br/>
+| support RS232
 |-
-| COM5<br/>
+| COM5
 | /dev/ttyUSB2
 | support RS232 and RS485
 |-
-| COM6<br/>
+| COM6
-| /dev/ttyUSB3<br/>
+| /dev/ttyUSB3
-| support RS232 and RS485<br/>
+| support RS232 and RS485
 |}
 '''Note&nbsp;:&nbsp;'''

← Older revision		Revision as of 01:29, 13 October 2021
Line 106:		Line 106:

	If you just want ttyUSB2 (or ttyUSB3)to be RSB485 mode, please change 0x0c to 0x04 (or 0x08).		If you just want ttyUSB2 (or ttyUSB3)to be RSB485 mode, please change 0x0c to 0x04 (or 0x08).
−
−
−
−	~~== ADS-B3399G Borad ==~~
−
−	~~The uart value have 4 digital total. 0xWXYZ~~
−	~~<pre>W : port3 - COM5 - /dev/ttyUSB3~~
−	~~X : port2 - COM4 - /dev/ttyUSB2~~
−	~~Y : port1 - - /dev/ttyUSB1~~
−	~~Z : port0 - - /dev/ttyUSB0~~
−	~~</pre>~~
−
−	~~There are 5 uart mode different with RSB4710 on ADS-B3399G board.~~
−	~~<pre>0 : LOOPBACK~~
−	~~1 : RS232~~
−	~~2 : RS485 HALF DUPLEX~~
−	~~3 : RS422/RS485 FULL DUPLEX~~
−	~~4 : SHUTDOWN~~
−	~~</pre>~~
−
−	~~For example : 0x32ff~~
−	~~<pre>setenv uart_mode 0x32ff</pre>~~
−
−	~~It means set port3 to be "'''RS422/RS485 FULL DUPLEX'''" and set port2 to be "'''RS485 HALF DUPLEX'''"~~

@@ Line 119: / Line 119: @@
 There are 5 uart mode different with RSB4710 on ADS-B3399G board.
-<pre>0 : LOOPBACK
+<pre>0&nbsp;: LOOPBACK
-: RS232
+&nbsp;: RS232
-: RS485 HALF DUPLEX
+&nbsp;: RS485 HALF DUPLEX
-: RS422/RS485 FULL DUPLEX
+&nbsp;: RS422/RS485 FULL DUPLEX
-: SHUTDOWN
+&nbsp;: SHUTDOWN
 </pre>
@@ Line 129: / Line 129: @@
 <pre>setenv uart_mode 0x32ff</pre>
-It means set port3 to be RS422/RS485 FULL DUPLEX and set port2 to be RS485 HALF DUPLEX
+It means set port3 to be "'''RS422/RS485 FULL DUPLEX'''" and set port2 to be "'''RS485 HALF DUPLEX'''"

← Older revision		Revision as of 03:39, 29 September 2021
Line 106:		Line 106:

	If you just want ttyUSB2 (or ttyUSB3)to be RSB485 mode, please change 0x0c to 0x04 (or 0x08).		If you just want ttyUSB2 (or ttyUSB3)to be RSB485 mode, please change 0x0c to 0x04 (or 0x08).
		+
		+
		+
		+	== ADS-B3399G Borad ==
		+
		+	The uart value have 4 digital total. 0xWXYZ
		+	<pre>W : port3 - COM5 - /dev/ttyUSB3
		+	X : port2 - COM4 - /dev/ttyUSB2
		+	Y : port1 - - /dev/ttyUSB1
		+	Z : port0 - - /dev/ttyUSB0
		+	</pre>
		+
		+	There are 5 uart mode different with RSB4710 on ADS-B3399G board.
		+	<pre>0 : LOOPBACK
		+	1 : RS232
		+	2 : RS485 HALF DUPLEX
		+	3 : RS422/RS485 FULL DUPLEX
		+	4 : SHUTDOWN
		+	</pre>
		+
		+	For example : 0x32ff
		+	<pre>setenv uart_mode 0x32ff</pre>
		+
		+	It means set port3 to be RS422/RS485 FULL DUPLEX and set port2 to be RS485 HALF DUPLEX

@@ Line 5: / Line 5: @@
 == <font color="#0066cc">RS-485</font> ==
 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.
@@ Line 23: / Line 23: @@
 | COM0
 | /dev/ttyS0<br/>
-| for BT Data<br/>
+| pull to M2 interface for BT using<br/>
 |-
 | COM2<br/>
@@ Line 29: / Line 33: @@
 | Debug Port<br/>
 |-
-| COM4<br/>
+| COM3<br/>
 | /dev/ttyUSB0<br/>
 | support RS232<br/>
 |-
-| USB2COM1
+| COM4
 | /dev/ttyUSB1<br/>
 | support RS232<br/>
 |-
-| USB2COM2<br/>
+| COM5<br/>
 | /dev/ttyUSB2
 | support RS232 and RS485
 |-
-| USB2COM3<br/>
+| COM6<br/>
 | /dev/ttyUSB3<br/>
 | support RS232 and RS485<br/>
 |}

@@ Line 95: / Line 95: @@
 </pre>
+'''RS422&nbsp;Mode: (ADS-B3399G)'''
 '''Note&nbsp;:&nbsp;'''

@@ Line 46: / Line 46: @@
 |-
 | USB2COM3<br/>
-| dev/ttyUSB3<br/>
+| /dev/ttyUSB3<br/>
 | support RS232 and RS485<br/>
 |}
@@ Line 61: / Line 61: @@
 . COM2 is designed as debug port default.&nbsp;
 = How to config RS232 or RS485 mode =

@@ Line 66: / Line 66: @@
 = How to config RS232 or RS485 mode =
-== Enter U-boot interrupt mode ==
+Enter U-boot interrupt mode
 Connect device to debug port, and open debug console. See more&nbsp;:&nbsp;[http://ess-wiki.advantech.com.tw/view/How_to_debug_for_RK3399_RSB4710 How_to_debug].
@@ Line 78: / Line 78: @@
 == Config Uart Mode ==
-<pre>setenv ttyUSB2 RS485
-setenv ttyUSB3 RS485
+Only ttyUSB2 and ttyUSB3 support RS485 mode.
 saveenv
 reset
 </pre>
 The default value is RS232.