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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/01/25 12:54:43 UTC
[GitHub] [incubator-nuttx] acassis commented on a change in pull request #5295: sim: Added Kconfig option for UART buffer size.
acassis commented on a change in pull request #5295:
URL: https://github.com/apache/incubator-nuttx/pull/5295#discussion_r791681134
##########
File path: arch/sim/Kconfig
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@@ -422,28 +422,87 @@ endchoice
endif
+menu "Simulated UART"
+
config SIM_UART_NUMBER
- int "The number of tty ports on sim platform, range is 0~4"
+ int "Number of simulated UART ports"
default 0
+ range 0 4
+ ---help---
+ Under simulation, a NuttX port can be bound to a serial
+ port on the host machine. This way NuttX can access the
+ host's hardware directly.
+
+ The NuttX and the host serial ports must have the same
+ name for this to work.
+
+ The host's port is not necessary to be an actual h/w port.
+ You can create a "simulated" port in your host too,
+ by running:
+
+ socat PTY,link=/dev/ttySIM0 PTY,link=/dev/ttyNX0
+ stty -F /dev/ttySIM0 raw
+ stty -F /dev/ttyNX0 raw
+
+ In this case NuttX will use the ttySIM0 port, and another
+ software may open and use the ttyNX0 port.
+ This way other softwares may communicate directly with
+ the simulation.
Review comment:
@fjpanag I think the "--help--" here should also show how the users can use a physical port (i.e. /dev/ttyUSB0). Although you said "can be bound to a serial port on the host machine" and that the port don't need to be an actual h/w port it will be confuse to newcomers to realize they can use a physical port because all the default names are to /dev/ttySIM0. I suggest start showing that he could use the physical port before creating new virtual ports using socat
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