[Dprglist] STM32 software uart

[David Anderson]

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