Michel Lavoie <[email protected]> wrote:
> [-- text/plain, encoding quoted-printable, charset: UTF-8, 81 lines --]
>
> I strongly recommend that you read Adafruit's guide regarding the BBB's
> device tree overlay. It really help me put this all together:
> https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree/overview
>
> You will find there why and how to modify your uEnv.txt file in order to
> enable ttyO1. In mine, the last line looks like this:
>
> ...
> optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0
>
> optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0
>
> optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0
>
> optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0
>
>
The Adafruit UART IO documentation specifically says that it *does*
export the overlays:-
The Adafruit IO Python library will export the UART device tree
overlays as a convenience. There are five serial ports brought to
the expansion headers (UART3 only has a single direction, TX), and
one (UART0) with dedicated headers that aren't available to use in
your Python programs.
... but not all the UARTs work.
In addition the use of the letter O in the device name is just silly! :-)
The devices it creates are called /dev/ttyO1, /dev/ttyO2, etc. with
the letter O. There's not a mention anywhere that it's a letter
rather than a digit and given the context it's second nature to assume
it's a zero. Still I did spot that eventually.
--
Chris Green
ยท
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