[Dprglist] STM32 software uart

[Chris N]

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> 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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