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<p>Cool part. thanks.</p>
<p>dpa</p>
<p><br>
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<div class="moz-cite-prefix">On 05/07/2020 09:51 AM, Chris N wrote:<br>
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cite="mid:CA++ApaUHZHR_+Z-TnAZY_Y_qPpwW7VMEb9R7HttM4=3QRiRnzQ@mail.gmail.com">
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<div class="gmail_default" style="font-size:x-small">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. </div>
<div class="gmail_default" style="font-size:x-small"><br>
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<div class="gmail_default" style="font-size:x-small">Chris
Netter.<br>
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<div dir="ltr" class="gmail_attr">On Wed, May 6, 2020 at 11:46
PM David Anderson via DPRGlist <<a
href="mailto:dprglist@lists.dprg.org" moz-do-not-send="true">dprglist@lists.dprg.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello
DPRG,<br>
<br>
As discussed in Tueday's RBNO, I'm trying to port my jBot code
to the <br>
STM32F411RE and have run out of UARTS. I need 5 and the board
only <br>
supports 3 in hardware (USART1, USART2, USART6). So I was
looking at <br>
adding another CPU, a teensy, and using SPI or I2C for comm
between the <br>
two boards.<br>
<br>
I found several software uarts but all were for sale. Turns
out I <br>
didn't look hard enough. There is a free one available from
ST Micros <br>
it self: stsw-stm3156. It requires an available timer, which
I think <br>
I have, and a couple of free GPIO pins. I've downloaded the
sofware <br>
and docs and am cautiously optimistic...<br>
<br>
dpa<br>
<br>
<br>
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