[Dprglist] STM32 software uart

[David Anderson]

Cool part.  thanks.

dpa



On 05/07/2020 09:51 AM, Chris N wrote:
> If you have SPI available, how about an external UART w/ SPI 
> interface, such as the MAX3100?   The MAX3100 is a single UART device 
> and comes in prototyping-friendly packages.  There are also dual and 
> quad UART devices in the same family but I think those are only 
> available in much smaller packages.   Somebody probably makes a 
> breakout board......   I am sure NXP, Microchip, AD, etc etc make 
> similar devices.  I think I have also seen UART expanders w/ I2C 
> interface.
>
> Chris Netter.
>
> On Wed, May 6, 2020 at 11:46 PM David Anderson via DPRGlist 
> <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>
>     Hello DPRG,
>
>     As discussed in Tueday's RBNO, I'm trying to port my jBot code to the
>     STM32F411RE and have run out of UARTS.  I need 5 and the board only
>     supports 3 in hardware (USART1, USART2, USART6).  So I was looking at
>     adding another CPU, a teensy, and using SPI or I2C for comm
>     between the
>     two boards.
>
>     I found several software uarts but all were for sale.  Turns out I
>     didn't look hard enough.  There is a free one available from ST
>     Micros
>     it self:  stsw-stm3156.  It requires an available timer, which I
>     think
>     I  have, and a couple of free GPIO pins.  I've downloaded the sofware
>     and docs and am cautiously optimistic...
>
>     dpa
>
>
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