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59 lines
1.5 KiB
Markdown
59 lines
1.5 KiB
Markdown
---
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title: "SD"
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aliases:
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- firmwareapi/pycom/machine/sd.html
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- firmwareapi/pycom/machine/sd.md
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- chapter/firmwareapi/pycom/machine/sd
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---
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The SD card class allows to configure and enable the memory card module of your Pycom module and automatically mount it as `/sd` as part of the file system. There is a single pin combination that can be used for the SD card, and the current implementation only works in 1-bit mode. The pin connections are as follows:
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`P8: DAT0`, `P23: SCLK` and `P4: CMD` (no external pull-up resistors are needed)
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If you have one of the Pycom expansion boards, then simply insert the card into the micro SD socket and run your script.
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{{% hint style="info" %}}
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Make sure your SD card is formatted either as FAT16 or FAT32.
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{{< /hint >}}
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## Quick Example Usage:
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```python
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from machine import SD
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import os
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sd = SD()
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os.mount(sd, '/sd')
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# check the content
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os.listdir('/sd')
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# try some standard file operations
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f = open('/sd/test.txt', 'w')
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f.write('Testing SD card write operations')
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f.close()
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f = open('/sd/test.txt', 'r')
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f.readall()
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f.close()
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```
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## Constructors
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#### class machine.SD(id, ...)
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Create a SD card object. See [`sd.init()`](sd.md#sd-init-id-0) for parameters if initialisation.
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## Methods
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#### sd.init(id=0)
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Enable the SD card.
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#### sd.deinit()
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Disable the SD card.
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{{% hint style="info" %}}
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Please note that the SD card library currently supports FAT16/32 formatted SD cards up to 32 GB. Future firmware updates will increase compatibility with additional formats and sizes.
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{{< /hint >}}
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