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lizby
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Joined: 17/05/2016
Location: United States
Posts: 3378

Posted: 11:33pm 04 Nov 2020

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Still need a connection from the 3V3 to the VDDs, I think--even though it's on-board through the bootloader header.

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 08:04am 05 Nov 2020

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Thanks Lizby I missed that one

3v3 and gnd highlighted below

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10315

Posted: 08:10am 05 Nov 2020

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Have you got a Nucleo-L432KC? If not buy one and develop on that - it is what I used for the initial ArmmiteL4 development. Also check their circuit against yours (in the Nucleo manual)

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 08:38am 05 Nov 2020

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Peter
Yes I have one of those boards
I'm trying to design a circuit but I'd like to use USB to program it rather than using the STLINK by dropping your bin file via the computer
is this possible with the STM32L431CCT6 by connecting a uart to the console pins on the Armmite

I "think" it can be done if I have BOOT0 as +3v3 rather than GND for normal use

or do I "have" to include the STMLINK connections?
I "believe" the Boot0 pin has to be connected to GND for normal use and +3.3 for programming?
I did actually read the manual and looked at all the available circuits I could find before I started this project
Edited 2020-11-05 18:48 by lew247

matherp
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Posts: 10315

Posted: 08:48am 05 Nov 2020

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All STM32 chips have the internal bootloader and can be programmed without a STLINK. You can program it over USB or a UART by setting BOOT0 as you indicate. A UART can only be used if it is using the default pins for that port. I can't remember if this is the case for the 32 pin chip but hopefully it is.

lew247

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Joined: 23/12/2015
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Posted: 10:38am 05 Nov 2020

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Peter, thanks for confirming that
one last question if you don't mind
When using the STM32L431CCT6 as an Armmite, can you confirm it only needs the 32.768Mhz crystal and doesn't need another on pins 7 and 8? osc_in and osc_out?

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 08:54pm 05 Nov 2020

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Schematic_Gauge Controller STM32L4_2020-11-05_22-27-02.pdf

Changed the circuit to use the FT232 USB-UART instead of the CH340
Hopefully I haven't messed the rest of the circuit up- famous last words �will accept criticism �

*Edited X2 to correct mistakes
Edited 2020-11-06 08:28 by lew247

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 07:25pm 06 Nov 2020

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Final version I hope!
Changed a few things
ST232RL USB-UART and E-INK display
Boost controller, HC-12, DS18B20, E-INK and Stepper driver now only powered up when the CPU is not sleeping - this should lead to a much longer time being powered by battery
Added Mosfets to switch the above devices on from the Armmite.
PDF schematic attached if anyone wants to check it out

Schematic_Gauge Controller STM32L4_2020-11-06_19-30-43.pdf

Board layout below

Edited 2020-11-07 05:31 by lew247

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