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remove a warning

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4773 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2012-05-26 02:34:34 +00:00
parent 60a69157d1
commit 4f6cedf4c8
1 changed files with 41 additions and 1 deletions
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42
configs/stm32f4discovery/README.txt
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@ -1002,7 +1002,47 @@ Where <subdir> is one of the following:
CONFIG_STM32_OTGFS=y : STM32 OTG FS support
CONFIG_USBDEV=y : USB device support must be enabled
CONFIG_CDCACM=y : The CDC/ACM driver must be built
CONFIG_NSH_BUILTIN_APPS : NSH built-in application support must be enabled
CONFIG_NSH_BUILTIN_APPS=y : NSH built-in application support must be enabled
5. Using the USB console.
The STM32F4Discovery NSH configuration can be set up to use a USB CDC/ACM
(or PL2303) USB console. The normal way that you would configure the
the USB console would be to change the .config file like this:
CONFIG_STM32_OTGFS=y : STM32 OTG FS support
CONFIG_USBDEV=y : USB device support must be enabled
CONFIG_CDCACM=y : The CDC/ACM driver must be built
CONFIG_CDCACM_CONSOLE=y : Enable the CDC/ACM USB console.
However, that configuration does not work. It fails early probably because
of some dependency on /dev/console before the USB connection is established.
But there is a work around for this that does work fine (but has some side
effects). The following configuration will also create a NSH USB console
but this version will will use /dev/console. Instead, it will use the
normal /dev/ttyACM0 USB serial device for the console:
CONFIG_STM32_OTGFS=y : STM32 OTG FS support
CONFIG_USBDEV=y : USB device support must be enabled
CONFIG_CDCACM=y : The CDC/ACM driver must be built
CONFIG_CDCACM_CONSOLE=n : Done use the CDC/ACM USB console.
CONFIG_NSH_USBCONSOLE=y : Instead use some other USB device for the console
The particular USB device that is used is:
CONFIG_NSH_USBCONDEV="/dev/ttyACM0"
Now the side effects:
NOTE 1. When any other device other than /dev/console is used for a user
interface, linefeeds (\n) will not be expanded to carriage return /
linefeeds (\r\n). You will need to set your terminal program to account
for this.
NOTE 2: /dev/console still exists and still refers to the serial port. So
you can still use certain kinds of debug output (see include/debug.h, all
of the interfaces based on lib_lowprintf will work in this configraration).
nxlines:
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