Error with enabling DIO channel

[Chandana]

I want to set a digital IO channel to LOW. In the process of setting it LOW, first the channel is enabled.

But an error is reported at FDwfDigitalOutEnableSet( ) function call. Error is "dwf.DWFError: Error(0): DptiIO failed ERC:0X4."

Can anyone help in troubleshooting this?

[JColvin]

Hi @Chandana,

What board are you working with? An OpenScope MZ or an Analog Discovery 2? Or something else entirely?

Thanks,
JColvin

[Chandana]

Hi JColvin,

I'm using Analog Discovery 2.

Thanks,

Chandana

[JColvin]

Hi @Chandana,

I have moved your question to a more appropriate section of the forum where the engineers much more experienced with the Analog Discovery 2 look. I presume you are using SDK to program the digital IO channel? What version of Waveforms are you using and did you try out the Digital IO example that comes with WaveForms SDK in the example folder?

Thanks,
JColvin

[attila]

Hi @Chandana

The error code indicates that your application is not connected to the device.
const   ERC ercCapabilityNotEnabled     = 4;    //  The protocol is not enabled

In such case you should get "Invalid device handle provided" error, but some old software version might return the error you got.

Which WaveForms version are you using?

Are you calling FDwfDigitalOutEnableSet function from another process than FDwfDeviceOpen?

Could you post your code?

[Lakshmi Tejas M A]

Hello @attila

Using waveform version 3.8.11

Running code:
ao = dwf.DwfAnalogOut()
do = dwf.DwfDigitalOut(ao)
do.enableSet(4, True)//error occurs here

[attila]

Hi @Lakshmi Tejas M A

These 3 lines of code don't look like WF SDK function calls...

Please see the samples at:
C:/Program Files (x86)/Digilent/WaveFormsSDK/samples/py/

[Lakshmi Tejas M A]

Hello @attila We are using DWF lib. I have attached the example file.

DigitalOut_Pins.py

[Lakshmi Tejas M A]

Hi @attila did you check this?

[attila]

Hi @Lakshmi Tejas M A

I see you are using the 3rd party py/dwf 
I have installed this and the example is working for me with WF 3.8.11 and 3.9.1

Make sure to close WF app or other (custom) application that can keep the device busy.
Only one application can be connected to a device at a time.

C:\Users\#####>python DigitalOut_Pins.py
DWF Version: 3.9.1
Opening first device
Generating output counter for 10 seconds...

[Lakshmi Tejas M A]

On 1/7/2019 at 4:57 PM, attila said:

Hi @Lakshmi Tejas M A

I see you are using the 3rd party py/dwf 
I have installed this and the example is working for me with WF 3.8.11 and 3.9.1

Make sure to close WF app or other (custom) application that can keep the device busy.
Only one application can be connected to a device at a time.

C:\Users\#####>python DigitalOut_Pins.py
DWF Version: 3.9.1
Opening first device
Generating output counter for 10 seconds...

Hi @attila

thank you on checking on it.

We think analog discovery 2 is getting disconnected because of noise entering USB. Not sure.

wanted to know if we can close the device which is opened and reopen in this scenario.  

because WF is not open and some function are running but in middle this scenario is created. This doesn't happen every time.

 

ty

LT