Community Question

DJ/Jeremie

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

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

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

EZ-Builder screen:
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I can connect to EZB, but it crashes when i try to access the UART #0


SAME SETUP WITH EZB4 V1 (Blue Giga)

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

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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)
DJ Sures
Commented October 2017
I have been able to reproduce the experience. Stay tuned!
ptp
Commented October 2017
@DJ/RR

More
feedback...

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

I added the initialization statement:

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

after 2 seconds disconnected.
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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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Disconnected



I tested again with EZB4 v1 and no issues, i flooded the EZB with 100K of serial data, then i opened EZ-Builder, 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
Commented October 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
Commented October 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 EZ-Builder 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 EZ-Builder/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
Commented October 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 ?
Question
Avatarptp
Asked on Monday, October 9, 2017