Ezb - Uart 0 Not Working - Questions - Community

ptp

USA

Asked Oct 2017 — Edited Oct 2017

Resolved by DJ Sures!

Ezb - Uart 0 Not Working

DJ/Jeremie

EZB4 v2 (MXCHIP) UART 0 is not working please advise ?

Connection Information:

Wiring:
EZB4 v2
TX - Orange
RX - Yellow
GND - Green

SparkFun FTDI Basic Breakout - 3.3V
https://www.sparkfun.com/products/9873

EZ-Builder screen:

I can connect to EZB, but it crashes when i try to access the UART #0

SAME SETUP WITH EZB4 V1 (Blue Giga)

EZ-Builder / Desktop Communication App (Putty) OK:

Notes:
1) Is not clear but only 3 UART pins are connected (GND, RX, TX)
2) The problem is not the FTDI board, i tried two more with different chipsets.
3) IT's not working with 3 x EZB4 V2 (MxChip)
4) IT's working with 3 x EZB4 V1 (Blue Giga)

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Synthiam

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DJ Sures

PRO

Synthiam

#1 Oct 2017

The /2 you mention mxchip, which is not a developer of ezrobot. It's a wifi module - so it's similar to referencing the product by a capacitor or resistor manufacturer that exists on the /2. The manufacturer of the component has no relation to the code. The code is ezrobot and not mxchip. They will not be able to support this reported question.

I believe what you're saying is the test works work the /1 but not the /2?

I use the uart #0 daily, more so in the last few months while we're finalizing development of the ezrobot lidar. I haven't experienced any issues. So let's start by getting a details of what's going on...

1) Can you expand on what your test entails regarding data, baudrate and project configuration? The ezb has an input buffer - which is defined in the datasheet and I can't remember the size offhand, but it is pretty big.

2) crashing? If ARC is crashing, what is the error?

3) telnet into the /2 and report the firmware version to me please

Offhand I can't think of a possible correlation between the uart and /1 and /2 wifi antennas.

ptp

PRO

USA

#2 Oct 2017

Quote:

I believe what you're saying is the test works work the /1 but not the /2?

Correct (I mentioned mxchip to point to a EZB /2)

Quote:

3) telnet into the /2 and report the firmware version to me please

The setup/test steps to reproduce the problem:

1) Connect FTDI board to then EZB UART #0 (GND, TX, RX) Picture
2) Connect FTDI board to USB port/USB cable/Desktop
3) Power on EZB (12 v power source)
4) EZB successful connects to the WIFI network (client mode) / green light
5) Start ARC
6) Successful connected to the EZB

7) Add Terminal EZB control to an empty/new project

EZB disconnects automatically.

debug window content:

Code:

Setting i2c rate: 100000
EZ-B voltage is 12.309577158
EZ-B temperature is 25.39318697205904656C
Connected
Comm Err: System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at EZ_B.EZB.f9xEF7cNHr(Int32  , Byte[] cmdData)
BbytesToExpect: 5000
?
Received: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
Disconnected

8) Connect again (success), focus on the Terminal EZB and again:

Code:

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
Disconnected
Attempting connection on 192.168.18.55:23
Connected to 192.168.18.55:23
Reports EZB v4 OS With Comm 2
EZ-B v4 ID: 47-54-0-0-48-255-57-58-58-37-37-37
Setting battery monitor voltage: 7
Setting battery protection: True
Setting i2c rate: 100000
EZ-B voltage is 12.267090384
EZ-B temperature is 25.55123585362787880C
Connected
Comm Err: System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at EZ_B.EZB.f9xEF7cNHr(Int32  , Byte[] cmdData)
BbytesToExpect: 5000
?
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0 0 0 0 0 
Disconnected

Sometimes ARCs freezes for a few seconds before/after the error/disconnect

DJ Sures

PRO

Synthiam

#3 Oct 2017

Interesting... what data is putty transmitting when it disconnects? I.e. Are you typing text into the putty window?

ptp

PRO

USA

#4 Oct 2017

Nothing, the COM port is available but i didn't started Putty.

DJ Sures

PRO

Synthiam

#5 Oct 2017

What happens when you load the terminal program without any wires connected to the uart 0?

Dunning-Kruger

Canada

#6 Oct 2017

@ptp... Try initializing the port first... I have had a similar problem with the ssc-32 boad using the comm2 ezb4... Had to initialize the port even though the ssc-32 control was added to my project... If I didn't ARC would lock up and the ezb4 had to be rebooted...
Run this separately in a script...

Code:

UARTInit(0, 0, baudrate)

thetechguru

PRO

USA

#7 Oct 2017

So, I just want to point out that DJ said EZ-B Lidar testing.

Drops Mic

Alan

DJ Sures

PRO

Synthiam

#8 Oct 2017

....

ptp

PRO

USA

#9 Oct 2017

Hey,

DJ/Richard R, I'm away from my "batcave" so no EZB, I'll back soon to more tests.

DJ:
I want an office / Batcave with a view like that

DJ Sures

PRO

Synthiam

#10 Oct 2017

@ptp - that lidar view is quite nice

Best of all, isolated for focus

DJ Sures

PRO

Synthiam

#11 Oct 2017

I have been able to reproduce the experience. Stay tuned!

ptp

PRO

USA

#12 Oct 2017

@DJ/RR

More feedback...

Richard R Suggestion helped but long term does not fix the issue:

I added the initialization statement:

Then i added the Terminal EZB and i start sending and receiving some chars between Putty and ARC, it was working until i run a program to send random latin text to ARC @ 57600

after 2 seconds disconnected.

Error:

Code:

EZB 0: 
EZB 1: 
EZB 2: 
EZB 3: 
EZB 4: 
Windows version: Microsoft Windows NT 10.0.14393.0
WELCOME TUTORIAL disabled by user
Screen Resolution: 1680x1050 (96x96 dpi)
Version: 2017.10.04.00
Attempting connection on 192.168.18.55:23
Connected to 192.168.18.55:23
Reports EZB v4 OS With Comm 2
EZ-B v4 ID: 47-54-0-0-48-255-57-58-58-37-37-37
Setting battery monitor voltage: 7
Setting battery protection: True
Setting i2c rate: 100000
EZ-B voltage is 12.359788800
EZ-B temperature is 25.26147957075168636C
Connected
Comm Err: System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at EZ_B.EZB.f9xEF7cNHr(Int32  , Byte[] cmdData)
BbytesToExpect: 4141
-
Received: 101 114 116 32 104 105 97 32 109 101 105 46 32 78 101 99 32 109 111 100 111 32 101 105 114 109 111 100 32 99 111 110 115 116 105 116 117 97 109 32 99 117 46 13 13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
Disconnected

I tested again with EZB4 v1 and no issues, i flooded the EZB with 100K of serial data, then i opened ARC, successful connect (no prev uart init), i run the terminal, flood again @57600 bps and the serial content was visible in the terminal. Disconnect & Connect no issues so far.

The only difference is the top part (Wifi chip / firmware).

DJ Sures

PRO

Synthiam

#13 Oct 2017

1) if you overflow the buffer then you know what to expect. Don't do that. Find the uart input buffer size in the datasheet

2) the terminal control is causing the experience, not ezscript uart commands

3) in the meantime you can write an ezscript to read the uart buffer and display it

ptp

PRO

USA

#14 Oct 2017

DJ,

The overflow is not intentional.

I have a second micro-controller sending/receiving data from EZB.

Both are switched on at same time, the second micro-controller starts sending information (telemetry) to the EZB.

The overflow will occur between opening ARC or a custom Application , connect and start polling the UART buffer.

This can be fixed if i send a serial command to start before sending the information.

BUT if the ARC/Custom App gets disconnected before sending a stop command the problem is the same (flood).

I noticed similar disconnects when using the SDK UART method.

To avoid FUD... I minimized the scenario to a simple FTDI + EZB + EZ Terminal + Putty.

I replaced the /2 with /1 and I'm immune to random disconnects.

It's a specific setup and so far no one complain, you found the problem although from a rational point of view i would love to understand why /1 is working.

you have a lot on your plate, so let's move on (close the thread).

ptp

PRO

USA

#15 Oct 2017

DJ,

Regarding the Lidar solution can be used with the IPS ?
or the Lidar will replace the IPS ?
which one will be released first ?

Welcome to Synthiam!

ptp

Ezb - Uart 0 Not Working

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