How to use UART - Revision history

Phill.liu at 08:47, 11 June 2024

2024-06-11T08:47:19Z

Yunjin.jiang at 09:29, 25 March 2019

2019-03-25T09:29:16Z

Yunjin.jiang at 09:26, 25 March 2019

2019-03-25T09:26:23Z

Yunjin.jiang at 09:23, 25 March 2019

2019-03-25T09:23:55Z

Yunjin.jiang at 09:20, 25 March 2019

2019-03-25T09:20:01Z

Yunjin.jiang at 09:16, 25 March 2019

2019-03-25T09:16:43Z

Yunjin.jiang at 09:22, 14 February 2019

2019-02-14T09:22:44Z

Yunjin.jiang at 09:16, 14 February 2019

2019-02-14T09:16:55Z

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..."

2019-02-14T09:15:58Z

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''' =

== RSB4680 Borad ==

{| cellspacing="1" cellpadding="1" border="1" align="left"
|-
! scope="col" | '''COM Name'''
! scope="col" | '''Device Node''' 
! scope="col" |
'''Remark'''

|-
| UART0 
| /dev/ttyS0 
| for BT Data 
|-
| COM1 
| /dev/ttyS1 
| 
|-
| COM2 
| /dev/ttyS2 
| Debug Port 
|-
| COM3 
| /dev/ttyS3 
| 
|-
| COM4 
| /dev/ttyS4 
| Supprot RSB485 
|-
| COM6 
| /dev/ttyUSB0 
| Usb to Uart 
|-
| COM7 
| /dev/ttyUSB1 
| Usb to Uart 
|}

 

[[File:RS232andRS485Jumper.PNG|RTENOTITLE]]

@@ Line 1: / Line 1: @@
-= '''Overview''' =
+<h1><b>Overview</b></h1>
-<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>
+<p><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></p>
-== <font color="#0066cc">RS-485</font> ==
+<h2><font color="#0066cc">RS-485</font></h2>
-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.
+<p>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&#39;s transmit mode. Usually the UART RTS signal is used to switch the transmitter on and off.</p>
-= '''Boards''' =
+<h1><b>Boards</b></h1>
-== RSB4680 Borad ==
+<h2>EPC-4680 Borad</h2>
-{| border="1" cellspacing="1" cellpadding="1" style="width:500px;"
+<table border="1" cellpadding="1" cellspacing="1" style="width:500px;">
-|-
+	<tbody>
-| style="width: 119px;" | <span style="color:#FF0000;">'''COM Name'''</span>
+		<tr>
-| style="width: 123px;" | <span style="color:#FF0000;">'''Device Node'''</span>
+			<td style="width: 119px;"><span style="color:#FF0000;"><b>COM Name</b></span></td>
-| style="width: 240px;" | <span style="color:#FF0000;">'''Remark'''</span>
+			<td style="width: 123px;"><span style="color:#FF0000;"><b>Device Node</b></span></td>
-|-
+			<td style="width: 240px;"><span style="color:#FF0000;"><b>Remark</b></span></td>
-| style="width: 119px;" | COM0
+		</tr>
-| style="width: 123px;" | /dev/ttyS0<br/>
+		<tr>
-| style="width: 240px;" | for BT Data<br/>
+			<td style="width: 119px;">COM0</td>
-|-
+			<td style="width: 123px;">/dev/ttyS0</td>
-| style="width: 119px;" | COM1<br/>
+			<td style="width: 240px;">&nbsp;BT</td>
-| style="width: 123px;" | /dev/ttyS1<br/>
+		</tr>
-| style="width: 240px;" | <br/>
+		<tr>
-|-
+			<td style="width: 119px;">COM1</td>
-| style="width: 119px;" | COM2<br/>
+			<td style="width: 123px;">/dev/ttyS2</td>
-| style="width: 123px;" | /dev/ttyS2<br/>
+			<td style="width: 240px;">Debug Port</td>
-| style="width: 240px;" | Debug Port<br/>
+		</tr>
-|-
+		<tr>
-| style="width: 119px;" | COM3<br/>
+			<td style="width: 119px;">COM2</td>
-| style="width: 123px;" | /dev/ttyS3<br/>
+			<td style="width: 123px;">/dev/ttyS4</td>
-| style="width: 240px;" | <br/>
+			<td style="width: 240px;">485</td>
-|-
+		</tr>
-| style="width: 119px;" | COM4<br/>
+		<tr>
-| style="width: 123px;" | /dev/ttyS4<br/>
+			<td style="width: 119px;">COM3</td>
-| style="width: 240px;" | Supprot RSB485<br/>
+			<td style="width: 123px;">/dev/ttyUSB0</td>
-|-
+			<td style="width: 240px;">&nbsp;</td>
-| style="width: 119px;" | COM5<br/>
+		</tr>
-| style="width: 123px;" | /dev/ttyUSB0<br/>
+		<tr>
-| style="width: 240px;" | Usb to Uart<br/>
+			<td style="width: 119px;">COM4</td>
-|-
+			<td style="width: 123px;">/dev/ttyUSB1&nbsp;</td>
-| style="width: 119px;" | COM6
+			<td style="width: 240px;">&nbsp;</td>
-| style="width: 123px;" | /dev/ttyUSB1<br/>
+		</tr>
-| style="width: 240px;" | Usb to Uart<br/>
+		<tr>
-|}
+			<td style="width: 119px;">COM5</td>
-<span style="color:#FF0000;">'''Note :&nbsp;'''</span>
+<p>2. Only COM4 support RSB485.</p>
-. Only COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using.
+<p>3. COM2 is designed as debug port default.&nbsp;</p>

← Older revision		Revision as of 09:29, 25 March 2019
Line 50:		Line 50:


−	<br/>	+	<span style="color:#FF0000;">'''Note : '''</span>
		+
		+	1. Only COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using.
		+
		+	2. Only COM4 support RSB485.
		+
		+	3. COM2 is designed as debug port default.

@@ Line 41: / Line 41: @@
 | style="width: 240px;" | Usb to Uart<br/>
 |-
-| style="width: 119px;" | COM6<br/>
+| style="width: 119px;" | COM6
 | style="width: 123px;" | /dev/ttyUSB1<br/>
-| style="width: 240px;" |
+| style="width: 240px;" | Usb to Uart<br/>
 |}
@@ Line 52: / Line 50: @@
+<br/>

@@ Line 11: / Line 11: @@
 == RSB4680 Borad ==
-{| cellspacing="1" cellpadding="1" border="1" align="left"
+{| border="1" cellspacing="1" cellpadding="1" style="width:500px;"
 |-
-! scope="col" | '''COM Name'''
+| style="width: 119px;" | <span style="color:#FF0000;">'''COM Name'''</span>
-! scope="col" | '''Device Node'''<br/>
+| style="width: 123px;" | <span style="color:#FF0000;">'''Device Node'''</span>
-! scope="col" |
+| style="width: 240px;" | <span style="color:#FF0000;">'''Remark'''</span>
 |-
-| COM0<br/>
+| 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<br/>
+| style="width: 240px;" |
 |}
@@ Line 72: / Line 72: @@
 =  =
-<span style="color:#FF0000;">'''Note :&nbsp;'''</span>
+<span style="color:#FF0000;">'''Note&nbsp;:&nbsp;'''</span>
 . COM1、COM2、COM3、COM4、COM5 and COM6 are designed for custom using.

@@ Line 61: / Line 61: @@
 &nbsp;
 = Test uart =
 TBD

← Older revision		Revision as of 09:22, 14 February 2019
Line 76:		Line 76:


−	~~[[File:RS232andRS485Jumper.PNG\|RTENOTITLE]]~~	+
		+
		+
		+
		+
		+
		+
		+
		+
		+
		+
		+
		+
		+
		+	= Test uart =
		+
		+	TBD