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Old Oct 16, 2012, 07:33 PM
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Joined Oct 2012
224 Posts
hello snackescb
can make the circuit, load the program for c8051f330 of silab?
I just loaded circuits for avr and pic, can you help me?
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Old Oct 17, 2012, 07:54 AM
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Joined Dec 2010
378 Posts
Originally Posted by snakescb View Post
Hi again,

Ok, attached you can find my simple implementation for scilabs controllers. Not perfect yet, still working on, but I already made a lot of flights using this FW with some turnigy plush 12 esc's. I am developing the code in Ride7 and it is compiled using the RKit-51 on a hobbyist license.

Some ideas how to make motor startup smoother?

looking forward to receive some feedback

im not good with assembly .. but i also build a ESC atm. ..

the startup works smooth with about 25% PWM (depending on input voltage) i dont did anything special. so here is generally how i do it:

rotorState = 0

  if(rotorState == 0){
     rotorState = 1;
  }else if(rotorState == 1){
     rotorState = 2;
  } .. so on
to get rid of some ADC interrupt noise i do some edge verification in startup phase. delayed by arround 5us atm. 3 times.


compInterrupt(){ // backEMF interrupt
    if(edge != exepted edge) return;
    delay 5us;
    if(edge != exepted edge) return;
    delay 5us;
    if(edge != exepted edge) return;

i use 40 goodies (successful backEMF interrupts in a row)

here is a video .. active freewheel works also .. as you can see on the voltage display :P (the power supply dont likes it)

CIMG4088 (0 min 0 sec)

regards felix
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Last edited by juuuut; Oct 17, 2012 at 10:38 AM.
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Old Oct 18, 2012, 03:37 PM
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Joined Feb 2010
6 Posts
Hi Felix,
that looks very good.Nice startup response.

go on and make it a sucsess

grz B.
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Old Oct 19, 2012, 01:38 AM
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Joined Oct 2012
3 Posts
Hi Felix....

this is quite impressive... I still have to work on my startup until I reach this Thanks a lot for your help...
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Old Oct 23, 2012, 09:38 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
3,039 Posts
Does anybody use any BLDC development kit?
I'm thinking about using this TI kit: https://estore.ti.com/DK-LM4F-DRV831...MCU-P3033.aspx

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Old Feb 12, 2013, 06:20 AM
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Joined Feb 2013
1 Posts
Hi Felix, thanks a lot for posting this!
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