Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to use UART"

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(Created page with "1. Overview<br/>2. Configuration 3. Boards *3.1 ROM3420 Borad *3.2 ROM7421 Borad")
 
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1. Overview<br/>2. Configuration
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1. Overview
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<span lang="en" style="font-family: &quot;新細明體","serif"; font-size: 12pt; mso-bidi-font-family: 新細明體; mso-font-kerning: 0pt; mso-ansi-language: en; mso-fareast-language: zh-tw; mso-bidi-language: ar-sa;"><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><br/>2. Configuration
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<span lang="en"><font color="#000000">The utility stty can configure the serial speed. Then the com port can be accessed as a file:</font></span> Check baudrate
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# stty -F /dev/ttymxc1 115200
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Read
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#cat /dev/ttymxc1 &
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Send
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#echo test > /dev/ttymxc1
  
 
3. Boards
 
3. Boards
  
 
*3.1 ROM3420 Borad
 
*3.1 ROM3420 Borad
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 +
{| style="width: 100.54%;" cellpadding="0" cellspacing="0" border="0" width="100%"
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|-
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! style="width: 18.32%;" |
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'''COM Name'''
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! style="width: 25.82%;" |
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'''NXP/Freescale Name'''
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! style="width: 27.92%;" |
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'''Device'''
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 +
! style="width: 27.92%;" |
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'''RS485 support'''
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 +
|-
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| style="width: 18.32%;" |
 +
COM0
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| style="width: 25.82%;" |
 +
UART2
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 +
| style="width: 27.92%;" |
 +
/dev/ttymxc1
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 +
| style="width: 27.92%;" |
 +
Yes
 +
 +
|-
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| style="width: 18.32%;" |
 +
COM1
 +
 +
| style="width: 25.82%;" |
 +
UART4
 +
 +
| style="width: 27.92%;" |
 +
/dev/ttymxc3
 +
 +
| style="width: 27.92%;" |
 +
Yes
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 +
|-
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| style="width: 18.32%;" |
 +
COM2
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| style="width: 25.82%;" |
 +
UART5
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| style="width: 27.92%;" |
 +
/dev/ttymxc4
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 +
| style="width: 27.92%;" |
 +
Yes
 +
 +
|}
 +
 
*3.2 ROM7421 Borad
 
*3.2 ROM7421 Borad
 +
 +
{| style="width: 100.54%;" cellpadding="0" cellspacing="0" border="0" width="100%"
 +
|-
 +
! style="width: 18.32%;" |
 +
'''COM Name'''
 +
 +
! style="width: 25.82%;" |
 +
'''NXP/Freescale Name'''
 +
 +
! style="width: 27.92%;" |
 +
'''Device'''
 +
 +
! style="width: 27.92%;" |
 +
'''RS485 support'''
 +
 +
|-
 +
| style="width: 18.32%;" |
 +
COM0
 +
 +
| style="width: 25.82%;" |
 +
UART2
 +
 +
| style="width: 27.92%;" |
 +
/dev/ttymxc1
 +
 +
| style="width: 27.92%;" |
 +
No
 +
 +
|-
 +
| style="width: 18.32%;" |
 +
COM1
 +
 +
| style="width: 25.82%;" |
 +
UART4
 +
 +
| style="width: 27.92%;" |
 +
/dev/ttymxc3
 +
 +
| style="width: 27.92%;" |
 +
No
 +
 +
|}

Revision as of 08:35, 25 January 2017

1. 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.
2. Configuration

The utility stty can configure the serial speed. Then the com port can be accessed as a file: Check baudrate 

# stty -F /dev/ttymxc1 115200

Read 

#cat /dev/ttymxc1 &

Send 

#echo test > /dev/ttymxc1

3. Boards

  • 3.1 ROM3420 Borad

COM Name

NXP/Freescale Name

Device

RS485 support

COM0

UART2

/dev/ttymxc1

Yes

COM1

UART4

/dev/ttymxc3

Yes

COM2

UART5

/dev/ttymxc4

Yes

  • 3.2 ROM7421 Borad

COM Name

NXP/Freescale Name

Device

RS485 support

COM0

UART2

/dev/ttymxc1

No

COM1

UART4

/dev/ttymxc3

No

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