SD card example only works once

[Rumidom]

hi I'm testing the spi sdcard driver with the following example on a ESP32 S3 and it works great, however it only works once. If I try to run it a second time using thonny I get "OSError: no SD card", even after machine.reset() I get the same error but if I unplug the USB cable and plug it again the example works, not really sure what is going on maybe Its a issue with SDCard object already existing?

import sdcard, os
from machine import Pin,SPI,SoftSPI,I2S,I2C,UART

spi  = SPI(2, sck=Pin(13), mosi=Pin(11), miso=Pin(12))
spi.init(baudrate=4000000, polarity=0, phase=0)

sd = sdcard.SDCard(spi, Pin(4))

vfs = os.VfsFat(sd)
os.mount(vfs, "/sd")

with open("/sd/twolines.txt", "w") as f:
        n = f.write("this is the first line\n this is the second")  # one block
        print(n, "bytes writen")

with open("/sd/twolines.txt", "r") as f:
        result = f.read()
        print(result)
            
os.umount('/sd')

another issue is that os.listdir() is broken with this driver, I always get the following error:

>>> os.mount(vfs, "/sd")
>>> os.chdir("/sd")
>>> os.listdir()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/lib/sdcard.py", line 230, in readblocks
OSError: [Errno 5] EIO

[mendenm]

Could you please try my update to the SDcard code, in PR765, micropython/micropython-lib#765
and see if it is better. I did quite bit of work on the code.

[Rumidom]

hi I did notice the original driver is 9 years old, thanks for working on it. but unfortunately I got a similar behavior, the code works only once and os.listdir() is broken giving me a different error this time :

>>> os.listdir("sd")
MPY: soft reboot
Traceback (most recent call last):
  File "<stdin>", line 17, in <module>
  File "sdcard2.py", line 320, in readblocks
  File "sdcard2.py", line 244, in readinto
OSError: [Errno 116] ETIMEDOUT: read timeout

the code I tested (ESP32 S3):

import sdcard2, os
from machine import Pin,SPI,SoftSPI,I2S,I2C,UART
import utime
#from crc16 import crc16

spi  = SPI(2, 24_000_000,sck=Pin(13), mosi=Pin(11), miso=Pin(12))

spi.init(baudrate=24_000_000, polarity=0, phase=0)

sd = sdcard2.SDCard(spi=spi, cs=Pin(4, Pin.OUT), baudrate=24_000_000, crc16_function=None)

vfs = os.VfsFat(sd)
os.mount(vfs, "/sd")

with open("/sd/twolines.txt", "w") as f:
    n = f.write("this is the first line\n this is the second")  # one block
    print(n, "bytes writen")
utime.sleep_ms(100)

with open("/sd/twolines.txt", "r") as f:
    result = f.read()
    print(result)
utime.sleep_ms(100)   

[mendenm]

Have you tried a lower baud rate, to make sure that there isn't something that cannot run at 24 MHz? That should be legal for any SD card, but maybe there is something wrong. Have you tried s different SD card? Can you test it by putting the code in main.py, and doing a bunch of operations without Thonny involved, just in case it is somehow breaking the SPI? I like Thonny, but its REPL interface does sometimes get in the way.

[Rumidom]

I tried different boundrates with no success, I noticed that the driver lowers the boundrate to 100000 on init, I also tried commenting that but didnt work. I'll try a different sd card next, but I'm leaning towards modifying the wiring and using machine.SDcard instead of SPI, for now I'll just use the flash memory and once I get the next iteration of my PCB I'll try implementing SDCard suport

[scruss]

How is the SD card attached?

[Rumidom]

a micro SDcard slot on a custom PCB, with a 100nf decoupling capacitor, do you think it could be a wiring issue? since it consistently works just after connecting the USB cable I discarded that possibility

[Rumidom]

I fixed the issue by changing the wiring to (sck = 39, miso=21, mosi = 42, cs =15), i think the problem was because i had a LCD on the same SPI as the sdcard, I have them separeted now and both drivers work