Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to use UART"
From ESS-WIKI
Yuming.lin (talk | contribs) |
Yuming.lin (talk | contribs) |
||
| Line 3: | Line 3: | ||
<span lang="en"><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/><span style="color: rgb(0, 0, 205);"><span style="font-size: large;">'''2. Configuration'''</span></span> | <span lang="en"><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/><span style="color: rgb(0, 0, 205);"><span style="font-size: large;">'''2. Configuration'''</span></span> | ||
| − | <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> | + | <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 | Check baudrate | ||
| Line 71: | Line 71: | ||
| | ||
| + | |||
| + | [[File:ROM3420 COM.png|252x213px]] | ||
3.2 ROM7421 Borad | 3.2 ROM7421 Borad | ||
Revision as of 10:32, 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 |
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 |