IoTGateway/BSP/Android/Gettingstarted/How to use UART
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Revision as of 08:35, 25 January 2017 by Yuming.lin (talk | contribs)
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 |