RESC: Automotive quality high voltage fork from the VESC

Discuss hardware related to the VESC such as the NRF nunchuk.
rew
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby rew » 07 Jun 2017, 15:43

So with the 144 pins you should be able to upgrade to F7. Personally I would expect that you'd stay at the F4 once you have that running, but it could be an interesting exercise to upgrade to F7.

ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 07 Jun 2017, 16:39

I will probably stick with the F4 for the first two that I build, I will then move to the F7 with the same dev board since I can just interchange these processors, right?

ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 07 Jun 2017, 17:03

I can also send you a board if you want to mess with it when I'm done

ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 07 Jun 2017, 17:14


rew
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby rew » 08 Jun 2017, 05:53


ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 08 Jun 2017, 19:05

I'm going to have to re-read that many times to understand what any of that meant :lol:

I knew about the pinout issue going into the project with the smaller chips. they have a whole page about it on the datasheet.

I'm hoping that with the 144 pin I will not have to move around any pins at all! :)

Another EE project for a client is consuming most of my time right now. I will have more time soon.

rew
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby rew » 09 Jun 2017, 20:12

For the F4, it is the DOWNWARD compatibility that requires a few pages in the datasheet. What it boils down to is that you design your board for the F4, and you end up with two zero-ohm resistors (when you mount an F072 or the likes) where 2.2uF would have gone if you had mounted a '405. I use a solder blob instead of the zero-ohm resistor. Or when I know the board will have mostly 072 installed, I short the spot for the cap in the board design.

ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 17 Jun 2017, 00:36

I am getting back to this project in the next few days I hope. I will post newer schematic soon!

ragonamuffin
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby ragonamuffin » 25 Jun 2017, 23:27


rew
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Joined: 25 Mar 2016, 12:29
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Re: Moving around pins on the STM32 and upgrading to f7 over f4

Postby rew » 26 Jun 2017, 08:50

You are not using a DRV83xx driver chip? I don't have it connected. As far as I know, the VESC will make sure no current is running and then do the DC calibration, without the use of the DC_CAL pin.


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