Re: Self test results

by **Fezoj** » Mon Dec 19, 2011 11:36 am

This solution worked like charm.
Thanks :)

by **dmmedia** » Mon Dec 26, 2011 10:44 am

Thanks for the hint. Has the same problem with Free PCB built Bus Pirate. Made a solder joint and all tests started to pass.

by **Dillon1337** » Mon Jan 02, 2012 11:11 pm

I have a self-assembled Bus Pirate v3.5 from a free PCB. It is on Firmware v5.10 (r559) and Bootloader v4.4
There is two problems below with the 3.3V voltage regulator:

Code: Select all: Connect (Vpu to +5V) and (ADC to +3.3V) Space to continue Ctrl AUX OK MODE LED OK PULLUP H OK PULLUP L OK VREG OK ADC and supply 5V(4.88) OK VPU(4.92) OK 3.3V(5.41) FAIL ADC(2.54) FAIL Bus high MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 0 MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 1 MOSI OK CLK OK MISO OK CS OK MODE and VREG LEDs should be on!

I saw an earlier post when somebody had similar problems that you told to go into mode 2 and do a few tests and these are my results:

If you go into a mode (m, 2) and enable the power supplies (W) does the VREG LED light?
Yes it does
VREG is attached to the 3v3 supply. Also, the Bus Pirate measures the voltage after the 'W' command, and if it is too low it should complain about a short.
No complaints
If you now press 'v' to get a voltage report, what do the 3.3volt and ADC report?
3.3v = 5.45v
ADC = 2.67v
What does the ADC measure (d) when unconnected?
ADC = 0v
Now connect the 3v3 to ADC and press d, what is the reading?
ADC = 2.57V
Now connect 5v0 to the ADC and press d, what is the reading?
ADC = 5.07V

Any help would be appreciated.

by **tayken** » Tue Jan 03, 2012 1:10 am

Dillon1337 wrote:If you now press 'v' to get a voltage report, what do the 3.3volt and ADC report?
3.3v = 5.45v
ADC = 2.67v
Any help would be appreciated.

That part kinda worries me. Did you do any part substitution? And are you sure that you have a 3.3V regulator, not a 5V regulator? How about the resistors in front of ADC?

by **ian** » Tue Jan 03, 2012 1:48 am

Hi Dillon,

And are you sure that you have a 3.3V regulator, not a 5V regulator? How about the resistors in front of ADC?

This is where I would start looking too. Maybe the voltage dividing resistors have a short or unsoldered lead?

by **bananbr** » Wed Jan 18, 2012 7:27 am

Folks,
Here are my results:
Bus Pirate v3b
Firmware v5.10 (r559) Bootloader v4.4
DEVID:0x0447 REVID:0x3043 (24FJ64GA002 B5)
http://dangerousprototypes.com

HiZ>~
Disconnect any devices
Connect (Vpu to +5V) and (ADC to +3.3V)
Space to continue
Ctrl
AUX OK
MODE LED OK
PULLUP H OK
PULLUP L OK
VREG OK
ADC and supply
5V(4.98) OK
VPU(0.00) FAIL
3.3V(3.20) OK
ADC(0.00) FAIL
Bus high
MOSI OK
CLK OK
MISO OK
CS OK
Bus Hi-Z 0
MOSI OK
CLK OK
MISO OK
CS OK
Bus Hi-Z 1
MOSI FAIL
CLK FAIL
MISO FAIL
CS FAIL
MODE and VREG LEDs should be on!
Any key to exit
Found 6 errors.

1-WIRE>W
Power supplies ON
1-WIRE>v
Pinstates:
1.(BR) 2.(RD) 3.(OR) 4.(YW) 5.(GN) 6.(BL) 7.(PU) 8.(GR) 9.(WT) 0.(Blk)
GND 3.3V 5.0V ADC VPU AUX - OWD - -
P P P I I I I I I I
GND 3.20V 4.98V 0.00V 0.00V L L L L L

What could be wrong ?

by **Sjaak** » Wed Jan 18, 2012 7:29 am

My guess is you forget the jumpers between Vpu and 5v and 3v3 and adc :)

by **bananbr** » Wed Jan 18, 2012 7:47 am

Actually i´ve just made a test with real jumpers and it worked just fine, probably the problem is with the probes I was using before.
Thx guys

by **Sjaak** » Wed Jan 18, 2012 8:47 am

bananbr wrote:Actually i´ve just made a test with real jumpers and it worked just fine, probably the problem is with the probes I was using before.
Thx guys

Congrats on getting it to work. Happy hacking ;)

by **emrum** » Wed Feb 08, 2012 6:22 am

my output

(VPU and 5V connected)

Code: Select all: AUX OK ... VREG OK ADC and supply 5V(4.47) FAIL VPU(4.49) OK ... Any key to exit Found 1 errors.

Which IC should I check / replace ?

(with VPU and 5V __DISCONNECTED__ :)

Code: Select all: ADC and supply 5V(4.47) FAIL VPU(0.00) FAIL 3.3V(3.33) OK ADC(3.47) OK Bus high MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 0 MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 1 MOSI FAIL CLK FAIL MISO FAIL CS FAIL MODE and VREG LEDs should be on! Any key to exit Found 6 errors.

by **ian** » Wed Feb 08, 2012 6:26 am

Hi Emrum,

It looks like your USB port has a low supply voltage, but still within spec (min 4.1volts). I don't think replacing anything would help.

by **emrum** » Wed Feb 08, 2012 6:33 am

ok, thanks

by **dydyt** » Tue Dec 04, 2012 8:36 pm

Bus pirate v3.6

Firmware BPv3-Firmware-v5.10

Code: Select all: HiZ>~ Disconnect any devices Connect (Vpu to +5V) and (ADC to +3.3V) Space to continue Ctrl AUX OK MODE LED OK PULLUP H OK PULLUP L OK VREG OK ADC and supply 5V(1.16) FAIL VPU(1.15) FAIL 3.3V(3.26) OK ADC(3.39) OK Bus high MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 0 MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 1 MOSI FAIL CLK FAIL MISO FAIL CS FAIL MODE and VREG LEDs should be on! Any key to exit Found 6 errors.

Whats wrong ?

by **tayken** » Tue Dec 04, 2012 11:38 pm

Hey dydyt,

I believe that is caused by the 5 V regulator (VR3). But first, can you upgrade to the latest firmware and try again?

by **ian** » Wed Dec 05, 2012 1:29 am

Hi dydyt,

It looks like the 5volt regulator is having a problem. It could be:
1. Self test jumpers not connected correctly
2. 5volts is shorted to ground somewhere (bad PCB or solder bridge on pins)
3. Bad regulator

Is it a Seeed Studio board? If so please contact them for a replacement and reference this thread. I'm sorry about the defective board.