Proxmark3 community

Dose13

Contributor

Registered: 2019-09-26

Posts: 29

HF anteanna unusable / Setmux ?

Good morning,

I am running the lates version of iceman's client on my pm3 rdv4:

 [ CLIENT ]          
  client: RRG/Iceman          
  compiled with GCC 7.5.0 OS:Linux ARCH:x86_64          

 [ PROXMARK3 RDV4 ]          
  external flash:                  present          
  smartcard reader:                present          

 [ PROXMARK3 RDV4 Extras ]          
  FPC USART for BT add-on support: absent          
          
 [ ARM ]
  bootrom: RRG/Iceman/master/c49bfa08 2020-05-05 20:17:35
       os: RRG/Iceman/master/c49bfa08 2020-05-05 20:17:51
  compiled with GCC 6.3.1 20170620

 [ FPGA ]
  LF image built for 2s30vq100 on 2020-02-22 at 12:51:14
  HF image built for 2s30vq100 on 2020-01-12 at 15:31:16          

 [ Hardware ]          
  --= uC: AT91SAM7S512 Rev B          
  --= Embedded Processor: ARM7TDMI          
  --= Nonvolatile Program Memory Size: 512K bytes, Used: 290269 bytes (55%) Free: 234019 bytes (45%)          
  --= Second Nonvolatile Program Memory Size: None          
  --= Internal SRAM Size: 64K bytes          
  --= Architecture Identifier: AT91SAM7Sxx Series          
  --= Nonvolatile Program Memory Type: Embedded Flash Memory 

When executing the tune command I am getting an error message that the HF antenna is UNUSABLE. First of all I exchanged antennas and the error message kept coming. Then I started to play with the hardware settings and noticed that setting any mux signal makes the antenna work:

hw setmux hipkd
hw setmux lopkd
hw setmux hiraw
hw setmux loraw

Complete output with hw setmux hipkd:

[usb] pm3 --> hw tune
[=] Measuring antenna characteristics, please wait...          
[=] You can cancel this operation by pressing the pm3 button          
..          
[+] LF antenna: 68,47 V - 125,00 kHz          
[+] LF antenna: 36,44 V - 134,83 kHz          
[+] LF optimal: 70,67 V - 126,32 kHz          
[+]LF antenna is OK 
          
[!]HF antenna is UNUSABLE          
          
[+] Displaying LF tuning graph. Divisor 88 is 134,83 kHz, 95 is 125,00 kHz.
          
[usb] pm3 --> hw setmux hipkd
[usb] pm3 --> hw tune
[=] Measuring antenna characteristics, please wait...          
[=] You can cancel this operation by pressing the pm3 button          
..          
[+] LF antenna: 68,47 V - 125,00 kHz          
[+] LF antenna: 36,44 V - 134,83 kHz          
[+] LF optimal: 70,67 V - 126,32 kHz          
[+]LF antenna is OK 
          
[+] HF antenna: 46,34 V - 13.56 MHz          
[+]HF antenna is OK          
          
[+] Displaying LF tuning graph. Divisor 88 is 134,83 kHz, 95 is 125,00 kHz.

However, pushing the button seems to loose this configuration and the antenna is no longer working.

I tried to find out where the setmux setting comes from and what it does. Unfortunately, I have neither deep programming skills nor I am an hardware expert. What I found out is that the "setmux signal" is part of the I/O's from chip: AT91SAM7S. I.e. MUXEL_HIPKD = PA19; MUXEL_LOPKD = PA20; MUXEL_HIRAW = PA21; MUXEL_LORAW = PA22.

My intention is to find out which part of the hardware is defect. Any ideas? I am also interested in understanding the follwoing:

- If none of the setmux settings is set, which I/O of the chip will than be triggered?
- What is the use of the setmux signals?

Any other hints or advise is also highly appreciated!

Cheers

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: HF anteanna unusable / Setmux ?

Strange,  it's different things.

The hw tune part is done here  https://github.com/RfidResearchGroup/pr … ain.c#L208
which assumse the GPIO hipeak is set high,  which we do in the main loop on device side when init. https://github.com/RfidResearchGroup/pr … in.c#L2080

hw setmux,  sets the GPIO pin high.  period.  https://github.com/RfidResearchGroup/pr … galoader.c

Which OS?,  did you compile yourself?  Any warnings/errors?

Dose13

Contributor

Registered: 2019-09-26

Posts: 29

Re: HF anteanna unusable / Setmux ?

I'm running Ubuntu 18.04 and did not compile it by myself:

dose@dose:~$ uname -a
Linux dose 4.15.0-99-generic #100-Ubuntu SMP Wed Apr 22 20:32:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

What I just saw when executing:

dmesg

[ 8654.486290] cdc_acm 2-1.1:1.0: ttyACM0: USB ACM device
[ 8876.036360] cdc_acm 2-1.1:1.0: failed to set dtr/rts 
[ 8876.103764] usb 2-1.1: USB disconnect, device number 9
[ 8876.376595] usb 2-1.1: new full-speed USB device number 10 using ehci-pci
[ 8881.619386] usb 2-1.1: New USB device found, idVendor=9ac4, idProduct=4b8f
[ 8881.619393] usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8881.619406] usb 2-1.1: Product: proxmark3
[ 8881.619409] usb 2-1.1: Manufacturer: proxmark.org
[ 8881.619410] usb 2-1.1: SerialNumber: iceman
[ 8881.619968] cdc_acm 2-1.1:1.0: ttyACM0: USB ACM device
[ 8894.791157] usb 2-1.1: USB disconnect, device number 10
[ 8896.804862] usb 2-1.1: new full-speed USB device number 11 using ehci-pci
[ 8896.916904] usb 2-1.1: New USB device found, idVendor=9ac4, idProduct=4b8f
[ 8896.916912] usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8896.916915] usb 2-1.1: Product: proxmark3
[ 8896.916918] usb 2-1.1: Manufacturer: proxmark.org
[ 8896.916921] usb 2-1.1: SerialNumber: iceman
[ 8896.917676] cdc_acm 2-1.1:1.0: ttyACM0: USB ACM device

cdc_acm 2-1.1:1.0: failed to set dtr/rts - Seems to make some trouble every now and then.

What I also just noticed is that when unplugging the USB cable from my computer and plugging it back again it says:

[!] ⚠️  Communicating with Proxmark3 device failed          
[=] Running in OFFLINE mode. Use "hw connect" to reconnect
          
[offline] pm3 --> hw connect
[=] Using UART port /dev/ttyACM0          
[=] Communicating with PM3 over USB-CDC          
[usb] pm3 --> hw tune
[=] Measuring antenna characteristics, please wait...          
[=] You can cancel this operation by pressing the pm3 button          
..          
[+] LF antenna: 68,06 V - 125,00 kHz          
[+] LF antenna: 36,44 V - 134,83 kHz          
[+] LF optimal: 70,26 V - 126,32 kHz          
[+]LF antenna is OK 
          
[+] HF antenna: 46,06 V - 13.56 MHz          
[+]HF antenna is OK  

Probably that is the connection ? ...

Thank's for your help, anyway!

Last edited by Dose13 (2020-05-06 11:52:44)