Adolfo Reyna
98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
import os
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import machine
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from machine import Pin, SDCard
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class SDCardManager:
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"""Utility class to mount and manage the onboard microSD card slot.
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Uses SDMMC 1-bit mode on Pins: sck=2, cmd=1, data0=3.
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"""
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def __init__(self, mount_point='/sd'):
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self.mount_point = mount_point
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self.sd = None
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self.mounted = False
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def mount(self):
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"""Initializes the SD card and mounts it to the filesystem.
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Returns:
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bool: True if mounted successfully, False otherwise.
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"""
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if self.mounted:
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print(f"SD card already mounted at {self.mount_point}")
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return True
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try:
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print("Initializing SDCard (SDMMC 1-bit mode: sck=2, cmd=1, data0=3)...")
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# slot=1 uses the SDMMC peripheral on the ESP32-S3
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self.sd = SDCard(slot=1, width=1, sck=2, cmd=1, data=(3,))
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print(f"Mounting SD card to {self.mount_point}...")
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os.mount(self.sd, self.mount_point)
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self.mounted = True
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print("SD card mounted successfully!")
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return True
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except Exception as e:
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print(f"Failed to mount SD card: {e}")
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self.sd = None
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self.mounted = False
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return False
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def unmount(self):
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"""Unmounts the SD card from the filesystem."""
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if not self.mounted:
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return True
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try:
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print(f"Unmounting SD card from {self.mount_point}...")
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os.umount(self.mount_point)
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self.mounted = False
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self.sd = None
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print("SD card unmounted.")
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return True
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except Exception as e:
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print(f"Failed to unmount SD card: {e}")
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return False
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def is_mounted(self):
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"""Returns True if the card is currently mounted."""
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return self.mounted
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def list_files(self):
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"""Lists files on the SD card if mounted.
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Returns:
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list: List of filenames or None if not mounted.
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"""
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if not self.mounted:
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print("SD card is not mounted.")
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return None
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try:
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return os.listdir(self.mount_point)
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except Exception as e:
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print(f"Error listing SD card files: {e}")
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return None
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def get_info(self):
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"""Returns storage information of the SD card.
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Returns:
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dict: {total_bytes, free_bytes} or None on error.
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"""
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if not self.mounted:
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return None
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try:
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stat = os.statvfs(self.mount_point)
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block_size = stat[0]
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total_blocks = stat[2]
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free_blocks = stat[3]
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return {
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"total_bytes": total_blocks * block_size,
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"free_bytes": free_blocks * block_size
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}
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except Exception as e:
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print(f"Error getting SD card info: {e}")
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return None
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