TODO: Pointer placement mode

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Ursadon
Posts: 52
Joined: 10 Mar 2019, 19:23

TODO: Pointer placement mode

Post by Ursadon » 21 Jul 2019, 06:27

There is interesting function at 0x304C8 - pointer placement. Resets stepping motors to real zero, so you can place rpm and speed arrows, if you previously removed them
pplace.jpg

Also boot loader mode at 0x396C6
screenshot.png

I calling this functions by changing PC register value, but somewhere there should be a function to call it. Maybe need to press down bttn, pull-up PortE.Pin5 and perform IPC reset via tRST pin. Need to investigate later :roll:

Code: Select all

void probably_enter_debug_mode()
{
  int v0; // r0

  watchdog_configuration_2();                   // 0xFC040000
  if ( Port_E_pin_4_state() )
  {
    sub_20034();
    if ( sub_2006C(9) - 180 <= 75 )             // press btn
    {
      sub_31B32();                              // Port E - pin 5
      if ( v0 )
      {
        sub_304C8();
        watchdog_configuration(94);
      }
      else
      {
        probably_debug_routine_v2();
        watchdog_configuration(93);
      }
    }
  }
  JUMPOUT(&loc_140A8);
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Go4IT
Posts: 300
Joined: 08 Feb 2019, 12:25

Re: TODO: Pointer placement mode

Post by Go4IT » 21 Jul 2019, 12:16

Yeah! :o Great internal debug function you fou d and very usefull also. Did you change PC by JTAG?

Go4IT
Posts: 300
Joined: 08 Feb 2019, 12:25

Re: TODO: Pointer placement mode

Post by Go4IT » 23 Jul 2019, 21:16

What tool gave you the C code from Disassembler? Is IDA able to do this?

User avatar
Ursadon
Posts: 52
Joined: 10 Mar 2019, 19:23

Re: TODO: Pointer placement mode

Post by Ursadon » 24 Jul 2019, 02:14

Go4IT wrote:
23 Jul 2019, 21:16
What tool gave you the C code from Disassembler? Is IDA able to do this?
Yes, 32bit IDA with ARM decompiler. Just press F5 to get code

Go4IT
Posts: 300
Joined: 08 Feb 2019, 12:25

Re: TODO: Pointer placement mode

Post by Go4IT » 25 Oct 2019, 17:54

Tried to jump to your given location but IPC simply restarts. Maybe the location depends on the FW-version?!

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