Forums - GT202 AT command mode

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GT202 AT command mode
Advanced Micropower
Join Date: 13 Dec 15
Posts: 5
Posted: Tue, 2015-12-29 05:57
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Hi,

I want to put the GT202 into AT command mode, It is as purchased - no firmware downloads.

Looking at the GT202 datasheet:

http://sp.chip1stop.com/sp/wp-content/uploads/2015/04/GT202_Data_Sheet-v...

If I pull HM[1:0]   to 01     then on power up it should enter:

                No external host required mode

Is the module now ready to accept AT serial commands on UART0   115200,8,n,1    ?

Will the debug UART1 transmit any information ?

What is possible / not possible with AT commands  ?

The AT commands are covered by a NON DISCLOSURE AGREEMENT (I Don't understand why !!)   - I have applied.. 

As this forum will be unable to help, how do I get support on these commands ?

Many thanks,

Alan..

 

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Re: GT202 AT command mode
Advanced Micropower
Join Date: 13 Dec 15
Posts: 5
Posted: Wed, 2015-12-30 11:21
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I have now tried as per the previous post, and the current drawn by the module was approx zero

I then pulled up the powerdown pin via a 4k7 resistor to 3V3 and the current is now about 30mA

I am sending AT commands to UART0, but no response (I have yet to get the documentation)

The serial lines are  3V3 digital  (FTDI - TTL lead) -  sits at 3V3 when not transmitting (as expected)

Any ideas why I am not getting a uart reply, I was expecting something ?

B.T.W   I don't understand the Alt matrix table  in the datasheet, How do I select an Alt mode ?

Thanks,

Alan..

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Re: GT202 AT command mode
Xen
Join Date: 28 Oct 14
Location: Tokyo
Posts: 2
Posted: Wed, 2016-01-06 23:20
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Look at the revision history on page 2 of GT202 Datasheet 1.4.

V1.4   2014/10/24   Delete 4.1 UART Serial link mode of page 12

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Re: GT202 AT command mode
Advanced Micropower
Join Date: 13 Dec 15
Posts: 5
Posted: Thu, 2016-01-07 01:07
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Hi Xen,

I never noticed that last revision, does this mean the AT commands are not now implemented in the device, or has the diagram just been removed in the datasheet ?

Thanks,

Alan..

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Re: GT202 AT command mode
Xen
Join Date: 28 Oct 14
Location: Tokyo
Posts: 2
Posted: Thu, 2016-01-07 02:10
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Hi,

I don't know the reason, but Qualcomm has removed its feature from QCA4002.

Xen

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Re: GT202 AT command mode
Advanced Micropower
Join Date: 13 Dec 15
Posts: 5
Posted: Mon, 2016-01-11 01:51
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Hi Xen,

If anyone has been using the AT commands in a design with previous versions of the GT202 - they will not be happy this feature has been removed !!

This change should have been a major highlight in the current datasheet, not one line in the revision notes !

We spent nearly a week trying to get the AT commands documentation (Non Disclosure Agreement)  and trying to get a response from the module. 

We have moved to a different part.

Many thanks for your help

Alan..

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Re: GT202 AT command mode
Advanced Micropower
Join Date: 13 Dec 15
Posts: 5
Posted: Mon, 2016-01-11 01:52
Top

Hi Xen,

If anyone has been using the AT commands in a design with previous versions of the GT202 - they will not be happy this feature has been removed !!

This change should have been a major highlight in the current datasheet, not one line in the revision notes !

We spent nearly a week trying to get the AT commands documentation (Non Disclosure Agreement)  and trying to get a response from the module. 

We have moved to a different part.

Many thanks for your help

Alan..

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