[Ovmsdev] OVMS v3.3 hardware

Craig Leres leres at xse.com
Tue Sep 7 07:13:39 HKT 2021

On 8/29/21 11:03 PM, Mark Webb-Johnson wrote:
> I now have two prototypes of the 4G modem using SIM7600G R2 chip for 
> OVMS v3.

I was comparing the v1.1 and v1.2 modem schematics to see what the 
differences are between my sim7600 converted board (v1.1) and the 
current production version. It looks like some inductors and related 
parts were added to the power supply (and I sort of remember you 
describing this back when the v3.2 ovms board came out).

I noticed the pdf files for the v1.2 modems are misnamed in the source tree:

     ice 521 % find . -name '*.pdf' | fgrep -i modem

Shouldn't the ones in the v3.2 directory be named *v1.2_20190610.pdf?

Aside from the R8/R9 to R6/R6 and u.fl component swap, are there other 
differences between the v1.2 and v1.3 modem boards? (Is it too soon to 
add the v3.3 and v1.3 pdfs to the source tree?)

On 8/17/21 12:31 AM, Michael Balzer wrote:
 > 2. Any chance to fix the missing HW flow control on the modem UART
 > connection?

(Is this the source of the "W (541151) cellular: UART hw fifo overflow" 
I see periodically?)


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