machine.SDCard module init failure.

[tadejales]

I am trying to migrate my code from external library to standard micropython libray. I am usnig ESP32 DevKit-V1 board.

This is barebone code that I am using at the moment to access SD card and interact with it. This version works.

import os
from machine import Pin, SPI
import sdcard

class SDCardModule:
    def __init__(self, spi, cs_pin):
        self.sd = sdcard.SDCard(spi, cs_pin)
        self.mount()

    def mount(self):
        os.mount(self.sd, '/sd')

    def write(self, path, data):
        with open('/sd/' + path, 'w') as f:
            f.write(data)

    def read(self, path):
        with open('/sd/' + path, 'r') as f:
            return f.read()

# Implementation example:
spi = SPI(1, sck=Pin(18), mosi=Pin(23), miso=Pin(19))
sd_module = SDCardModule(spi, Pin(5))
sd_module.write('test.txt', 'Hello, World!')
print(sd_module.read('test.txt'))

Terminal output:

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:4672
load:0x40078000,len:14536
load:0x40080400,len:3364
entry 0x400805cc
Hello, World!
MicroPython v1.20.0-327-gd14ddcbdb on 2023-07-27; ESP32 module with ESP32
Type "help()" for more information.

The following part is my implementation with machine.SDCard.

import os
from machine import Pin, SDCard

class SDCardModule:
    def __init__(self, slot=2, sck=None, miso=None, mosi=None, cs=None):
        self.sd = SDCard(slot=slot, width=1, sck=sck, miso=miso, mosi=mosi, cs=cs, freq=1000000)
        self.mount()

    def mount(self):
        os.mount(self.sd, '/sd')

    def write(self, path, data):
        with open('/sd/' + path, 'w') as f:
            f.write(data)

    def read(self, path):
        with open('/sd/' + path, 'r') as f:
            return f.read()

# Implementation example:
sd_module = SDCardModule(slot=2, sck=Pin(18), miso=Pin(19), mosi=Pin(23), cs=Pin(5))
sd_module.write('test.txt', 'Hello, World!')
print(sd_module.read('test.txt'))

Terminal output:

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:4672
load:0x40078000,len:14536
load:0x40080400,len:3364
entry 0x400805cc
E (1150) sdmmc_common: sdmmc_init_ocr: send_op_cond (1) returned 0x107
Traceback (most recent call last):
  File "boot.py", line 22, in <module>
  File "boot.py", line 8, in __init__
  File "boot.py", line 11, in mount
OSError: 16
MicroPython v1.20.0-327-gd14ddcbdb on 2023-07-27; ESP32 module with ESP32
Type "help()" for more information.

Can someone spot the problem as I am unable to do. I have tried to search for the problem on the forum and web, but did not find the solution or explanation that would help me resolve the problem.