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Forum: µC & Digital Electronics BTM-220 module (How to leave DUT mode?)


Author: Daniel Fandango (fandango)
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Hi,

I did hack an old Motorola access point, and I found a BTM-220A module 
inside.
I used it to build an interface for my ATmega protoboard, like schematic 
from Micropet Basisboard (googled).
Attached is a photo of the hand-made board.

Everything seems to work, so I receive informations through Realterm. 
However, when I sent a command "AT", the

module change to DUT mode (I supouse Device Under Test mode) and it 
doesn't accept serial commands anymore.

I did tryed to pull PIO4 up to restore configurations, but didn't work.

Any idea?

Well, when I power-on the board (first time), I did capture the 
following messages through Realterm:
ATE

==============================
BS-P100 MA
BUILD MA2.0.031  DATE 20060926
==============================
[RPS]
========================
m = FFFF8093
BM = 0
T1 = 800
T2 = 70
DT = 0
C = 55
========================

license:VALID
AccessM < NA >
BCCMD_CFM
MB ID : 0xF7B
[HookOn] CH0

==========================
[BDADDR] 00:07:88:47:2E:48
[PINCODE] 544295
==========================

W L Name
Sec. : 0x03, Enc. : 0x00
[dsp_setup_pre]
[dsp_R]
[dsp_RR]
[dsp_setup]
.................................................................
[daa_R]
[daa_RR]
DAA Reg Ctrl2: 0x00
DAA Reg Ctrl2: 0x00
DAA Reg Ctrl2: 0x00
DAA Reg Ctrl2: 0x00
DAA Reg Ctrl2: 0x00
0th DAA err
DAA: ISR
AccessM < GA >
DAA_CID_ON: 0x00

CH0 _CUT
AA : 12sec
AA : 12sec
AA : 12sec
AA : 12sec

... and so, after 12 seconds, repeatedly AA : 12sec.

So, I sent the command "AT" through Realterm and immediatly, the module 
restarts informing "Reboot DUT". After

this, the module was entered in DUT mode, and did not accepted any 
command (as showing in the attached

prinscreen).

I would like to interface this Bluetooth module with an ATmega32 in SPP 
mode. Any suggestions of how to leave this

DUT mode?

Thank you in advance.

Regards.

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