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Your application can set up the UART device to trigger a notification whenever valid bytes are received over the serial port. Similarly, your application can send bytes over UART. In raw mode, you can configure the baud rate, number of stop bits, parity, and inter-byte delay settings.
The 02-uart_raw Sample Application
The 02-uart_raw sample application creates two tasks, and defines three CLI commands - len(gth), delay, and tx. A companion Python script uart_raw_app.py runs on your computer and connects to the API UART port of your device.
Setup
To test bidirectional UART messaging:
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| Tip |
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You need to know the API and CLI serial ports corresponding to your . You will connect the uart_raw_app.py Python script to the API port, and the terminal client to the CLI port.Refer to the SmartMesh IP Tools Guide for information about how to identify the different serial ports. |
Overview
The 02-uart_raw sample application creates two tasks.
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| Note |
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Before you run this application, make sure you have Python and pyserial installed on your computer. Refer to the SmartMesh IP Tools Guide for installation instructions. |
The
uart_raw_app.py Python script defines the same CLI commands are the
02-uart_raw sample application, i.e.
len,
delay and
tx. On top of those, the
uart_raw_app.py Python script defines the
connect command to connect it to the API serial port of your
.
You can type help on both the 02-uart_raw sample application and the uart_raw_app.py Python script to obtain the list of available commands.
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> uart_raw app, ver 1.2.0.1
SmartMeshIP stack, ver 1.4.0.5
> help
help <command>
Commands:
mtrace
mset
mget
mseti
mgeti
mxtal
mfs
mlog
mtrace
minfo
mshow
len
delay
tx
> |
Type help in the uart_rawapp.py Python script:
| No Format |
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uart_app OCFDK Sample application
> help
Commands:
connect <comPort>
baudrate <bps>
stopbits <stopbits>
len <numBytes>
delay <numMs>
tx <numPackets>
exit
> |
Send UART frames from the
First, connect the uart_raw_app.py Python script to the API port of your
(here on
COM28).
| No Format |
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> connect COM28
> |
On the
, type the following command to send 5 packets of 10 bytes each, with an inter-packet delay of 100 ms to the
uart_raw_app.py Python script.
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> len 10
> delay 100
> tx 5
> Sending 5 UART packets, 10 bytes, delay 100 ms
uart TX ( 5): 00 01 02 03 04 05 06 07 08 09
uart TX ( 4): 00 01 02 03 04 05 06 07 08 09
uart TX ( 3): 00 01 02 03 04 05 06 07 08 09
uart TX ( 2): 00 01 02 03 04 05 06 07 08 09
uart TX ( 1): 00 01 02 03 04 05 06 07 08 09
done. |
The following is printed by the uart_raw_app.py Python script. Note that the uart_raw_app.py uses the 00 as a break between packets - there is no data framing in the raw UART (other than the interpacket delay).
| No Format |
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uart RX: 00 01 02 03 04 05 06 07 08 09
uart RX: 00 01 02 03 04 05 06 07 08 09
uart RX: 00 01 02 03 04 05 06 07 08 09
uart RX: 00 01 02 03 04 05 06 07 08 09
uart RX: 00 01 02 03 04 05 06 07 08 09 |
Receive UART frames at the
On the uart_raw_app.py Python script, type the following command to send 5 packets of 10 bytes each, with an inter-packet delay of 100 ms to the
:
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|---|
> len 10
> delay 100
> tx 5
Sending 5 UART packets, 10 bytes, delay 100 ms
uart TX ( 5): 00 01 02 03 04 05 06 07 08 09
uart TX ( 4): 00 01 02 03 04 05 06 07 08 09
uart TX ( 3): 00 01 02 03 04 05 06 07 08 09
uart TX ( 2): 00 01 02 03 04 05 06 07 08 09
uart TX ( 1): 00 01 02 03 04 05 06 07 08 09
done.
> |
The following is printed at the
:
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|---|
uart RX (10 bytes) 00 01 02 03 04 05 06 07 08 09
uart RX (10 bytes) 00 01 02 03 04 05 06 07 08 09
uart RX (10 bytes) 00 01 02 03 04 05 06 07 08 09
uart RX (10 bytes) 00 01 02 03 04 05 06 07 08 09
uart RX (10 bytes) 00 01 02 03 04 05 06 07 08 09 |
The mote uses the inter-byte timeout provided in the dn_open() call to "frame" the incoming bytes.