[ell-i-developers] Re: How to make serial working?

  • From: Pekka Nikander <pekka.nikander@xxxxxx>
  • To: ell-i-developers@xxxxxxxxxxxxx
  • Date: Sun, 1 Jun 2014 18:01:10 +0300

The current Ell-i board (Ellduino) Serial requires that you don't pull DTR or 
RTS up(?), IIRC.  They are used for reseting the board.  If you use a standard 
terminal program, that will pull the handshake signals so that the board goes 
to the reset state.

This is one of the things that will be fixed in the next boards.

The issue should be documented here:
but as of today, it is not.

Here is how we fix this for the Arduino IDE:



On 2014–06–01, at 17:00 , Qinglai Xiao <jigsaw@xxxxxxxxx> wrote:

> Hi Teemu,
> Thanks. Im working with the ell-i board, so the stm32f4 story doesn't
> really help.
> Im working at home, so I don't have logic analyser. I can manage to
> make serial working in a hard way by debugging it with mbed. However it
> could save a lot of time if someone shares the experience of ell-i +
> serial. 发件人: Teemu Hakala
> 发送时间: ‎2014/‎6/‎1 16:47
> 收件人: ell-i-developers@xxxxxxxxxxxxx
> 主题: [ell-i-developers] Re: How to make serial working?
> Hi
> I relayed this question to #ELL-i IRC channel on the Freenode network
> and was given a good link to things the software synth winner used as
> a starting point with the F4 Discovery:
> http://vedder.se/2012/07/play-mp3-on-the-stm32f4-discovery/
> Then there’s the usual "is everything properly connected" mantra. Are
> you working on it at home or with Ivan, ie. do you have access to a
> logic analyzer?
> - t
> On 1.6.2014, at 16:25, jigsaw <jigsaw@xxxxxxxxx> wrote:
>> Hi,
>> I first tried to load elli/Runtime/stm32/tests/test_Serial_write_uint8 to 
>> ell-i, but nothing is received in minicom or screen. Then I tried to 
>> manually initialize RCC and USART ( I tried both USART1 and USART2), but 
>> still failed.
>> I'm now trying to port the debugger to ell-i, but without working serial I 
>> can't make it.
>> Could anyone give a hand? Has anyone got serial working on ell-i with 
>> minicom or any other common terminal?
>> thx &
>> rgds,
>> -Qinglai

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