M20: List SD card

M20 is a member of a class of M-codes which are used to access and manage the contents of the connected Smoothie's SD Card

Issuing an M20 causes the contents of smoothies SD card to be output to its serial port.
A properly connected host will in turn receive and display the Smoothies SDcard directory to its console.

To verify and debug your Smoothie's serial connection try this: http://smoothieware.org/debug:computer-sees-board

{ARTHUR: Special instructions for Ethernet connections?}

Format

The command is used as such : 

M20  [S] [P]

Which means: output the contents of SD card to serial port while using [S] to define the format and [P] defines the directory to list

Parameters

Parameter Usage Example
S Style: Defines the format used to present the output M20 S0
P Directory: Defines the directory that will be listed M20

The S parameter when used with Smoothie supports Style 0 only, which is the default. If you do not include [S] it will assume [S0]
The P parameter is not supported by Smoothie. Smoothie defaults to the SDcards root directory.

If your SDcard contents was:
config.txt
firmware.cur
Readme.txt
myGgcode.gcode

This means if you command : 

M0 S0

or
M0 S0 P1

or
M0 S1 P1

or
M0 P2

….they will all print the following to the connected console:
Ok
config.txt
firmware.cur
Readme.txt
myGgcode.gcode

Configuration

The M20 command requires no special configuration settings

Further reading

These resources are used as references:


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