Another STM32F103 clone?

From	antispam@math.uni.wroc.pl
Newsgroups	comp.arch.embedded
Subject	Another STM32F103 clone?
Date	2023-01-08 03:30 +0000
Organization	Aioe.org NNTP Server
Message-ID	<tpddc3$1565$1@gioia.aioe.org> (permalink)

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I have bought few Blue Pills on Aliexpress.  I expected to receive
boards with some of known clones.  But what I get does not look
like any clone that I have heard of:
 - Cortex M4 with no FPU
 - 32k RAM
 - 128k flash
 - set of devices like STM32F103C8T6

Chip seems to be resonable compatible, but I noticed notable
difference in I2C peripherial: bit 14 in OAR1 (own address register 1)
seem to be stuck at 1 (this is reserved bit which in original chips
is 0).  Peripherial address decoding seem to be partial, I can access
registers at address incremented by 0x100, 0x200 or 0x300.  Similarly,
RAM shows in 128k range, incrementing address by 32k modifies the
same memory.

Most clones seem to use Cortex-M3.  GD has GD32E103 with Cortex-M4,
but GD docs claim extra features, apparently not present in this chip.

Does anybody heard of/seen chip with features above?

-- 
                              Waldek Hebisch

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Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-08 03:30 +0000
  Re: Another STM32F103 clone? Paul Rubin <no.email@nospam.invalid> - 2023-01-08 11:38 -0800
    Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-09 03:06 +0000
  Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-09 23:23 +0000
    Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-09 17:38 -0700
      Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-13 02:28 +0000
        Re: Another STM32F103 clone? Rick C <gnuarm.deletethisbit@gmail.com> - 2023-01-15 20:09 -0800
          Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-17 00:43 +0000
            Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-16 19:39 -0700
              Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-16 19:44 -0700
            Re: Another STM32F103 clone? Rick C <gnuarm.deletethisbit@gmail.com> - 2023-01-16 21:07 -0800
              Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-17 06:04 +0000
                Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-17 00:10 -0700
              Re: Another STM32F103 clone? David Brown <david.brown@hesbynett.no> - 2023-01-17 13:48 +0100
                Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-17 17:05 +0000
                Re: Another STM32F103 clone? David Brown <david.brown@hesbynett.no> - 2023-01-17 19:42 +0100
            Re: Another STM32F103 clone? Paul Rubin <no.email@nospam.invalid> - 2023-01-17 11:07 -0800
        Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-15 23:47 -0700
          Re: Another STM32F103 clone? antispam@math.uni.wroc.pl - 2023-01-17 05:41 +0000
            Re: Another STM32F103 clone? Don Y <blockedofcourse@foo.invalid> - 2023-01-17 00:04 -0700

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