On Tue, Sep 22, 2015 at 1:12 PM, GaCuest gacuest@gmail.com wrote:
The only solution I can think is to put the BMA250 in the second PCB and connect directly to STM32F and configure it as a USB device. I do not know if this is easy to do for us (software development) and solve the problem of EINTs.
making a GPIO an EINT on the STM32F, then reading I2C, then sending a few bytes of data as a USB event, it's about... 30-40 lines of code. if it's any more than that, you're doing something *drastically* wrong.
Thanks.
Also I found the following FFC cable: http://aliexpress.com/store/product/Free-Shipping-FPC-FFC-connector-cable-so...
Do you recommend use that connector or other (cheaper) connector?
honestly it's up to you. personally i just went for standard 0.254mm connectors, because that *really* makes it easy for developers. however, they're quite big, you need to get R/A ones, and i believe those could well be more expensive than a 6pin FFC.
so it is your decision, you know what the goal is, available space, target price and target market.
l.
Thanks.
l.
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