IoTGateway/BSP/Android/Gettingstarted/How to use UART
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Revision as of 09:19, 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 |
No |
| COM1 | UART4 |
/dev/ttymxc3 |
No |
| COM2 | UART5 |
/dev/ttymxc4 |
No |
3.2 ROM7421 Borad
| COM Name | NXP/Freescale Name | Device |
RS485 support |
|---|---|---|---|
| COM0 | UART2 |
/dev/ttymxc1 |
Yes |
| COM1 | UART4 |
/dev/ttymxc3 |
Yes |