M21: Initialize SD card

Compatibility Command: This command performs NO operation in Smoothieware and is kept for compatibility only.

This command exists in Smoothieware purely for compatibility with other firmware (like Marlin/RepRap firmware).

When received, Smoothieware acknowledges the command but does nothing.

Smoothieware automatically initializes the SD card on boot, so manual initialization is not required.

Format

The command is used as such:

M21

Which means: the command will be received but Smoothieware will perform no operation.

Parameters

The M21 command requires no parameters.

Example

If you command:

M21

Smoothieware will acknowledge the command but perform no operation.

The SD card will remain in its current state.

Configuration

The M21 command requires no special configuration settings.

Since Smoothieware handles SD card initialization automatically, this command is not necessary for normal operation.

Further reading

These resources are used as references: