Firmware update of newer STM32s could be done over USB too - you don't need separate UART for this. Just wire BOOT pin (pins) to GPIO(s) from EOMA to allow entering firmware update mode (DFU over USB). 64pin seems an overkill - there a lot of other package options, e.g. 48pin QFN, not to mention the BGA variants. Also, F103 is quite old one, probably the price might be good, but I would recommend some of newer ones (Cortex-M0 even) - look at F0, F2, F3 series. A good option could be this: STM32F071CB, the price goes below $2.50 for 100pcs, and it seems to have all you need - http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN7/PF259662
SiLabs "Precision 32" are also nice ones - very well balanced peripherals and packages (e.g. QFN40, SiM3U154), built in regulator from 5V (if needed). But the price is higher.
2014-08-07 12:07 GMT+03:00 Miguel Garcia gacuest@gmail.com:
2014-08-07 10:13 GMT+02:00 Luke Kenneth Casson Leighton lkcl@lkcl.net:
blegh - and you need 2 of them _and_ 2 analog ICs as well. that's starting to make the STM32F103 (64-pin variant) look attractive. and i know you can get that at around the $2.50 mark in 10k volumes.
*sigh* ok do you really need that USB Flash thing? because of a) the cost (at least $4.50) b) the number of ICs (4) it's starting to tip in favour of the STM32F again, i get the feeling you'd be better off wiring up the STM32F as a USB 1.1 device. you'll also need to wire up the UART to the EOMA68 interface and a couple of other pins to put it into "firmware upload" mode, but that's ok.
the advantage there is that i have some GPL'd KiCAD designs with STM32F already in them (or have found some out there when i last checked).
Yes, the USB flash drive can be removed.
I think Daniel also prefers a microcontroller.
2014-08-06 14:18 GMT+02:00 Luke Kenneth Casson Leighton lkcl@lkcl.net:
- one GPIO IC IN pin is needed for MicroSD "detect"
- digital GPIO IC OUT pin needed for power-up of LCD
- accelerometer IRQ goes to digital GPIO IC IN
- digital GPIO IC IN pin connects to IRQ-OUT of AXP209
- digital GPIO IC IN pin connects to Headphone-detect (in case you
want to alter volume on headphone-out)
So, do we connect all this to STM32F? Or do we have to add the STM32F and the digital GPIO IC?
Thanks.
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