esp_sdio驱动加载失败，

[liuyuaaa]

使用树莓派3b与esp32相连接，./rpi_init.sh sdio执行后，未见到主设备号为221的字符设备生成

[mantriyogesh]

Hello @liuyuaaa

Thank you for the logs and setup image. I think the wires are very long still.

Can you please get ESP logs, Host logs (dmesg, rpi_init.sh command run and output) in textual form? Can you please also try 1bit sdio mode : https://github.com/espressif/esp-hosted/issues/269#issuecomment-1780697351, which should face less signal integrity issues?

[liuyuaaa]

这是ESP32的logs, 还有Host的logs (dmesg, rpi_init.sh） dmesg.log ESP.log rpi_init.sh.log

[liuyuaaa]

我尝试了1bit sdio模式，在树莓派/boot/config.txt文件添加了dtoverlay=sdio,poll_once=off,bus_width=1，现象是一样的，还需要修改其他的吗

[mantriyogesh]

I assume this is 4 bit mode logs you had shared. Checked the logs. Logs as such are clean.

The jumper wire length is very big, need to make them smaller, else you would face such issues.

[mantriyogesh]

Also, worth to reduce clock frequency (along with smaller wires). Uncomment: https://github.com/espressif/esp-hosted/blob/ce3c50a33fa4bc562a1b6cbcee292c1ae0b0a404/esp_hosted_fg/host/linux/host_driver/esp32/sdio/esp_sdio.c#L714-L718

This is a common issue with jumper cables. If you can make PCB and use SDIO, will be better and SDIO signal integrity issues would not be faced. I hope the external pull-ups are already in place. Check the https://github.com/espressif/esp-hosted/blob/master/esp_hosted_fg/docs/Linux_based_host/porting_guide.md

Alternatively, if you just wish to evaluate, you can use SPI transport instead of SDIO, which is very simple to test, with jumper cables.

ESP and host code compatibility

• Do you flash the ESP using 0.0.5 ESP32 SDIO binary? If using ESP32 SDIO binary, please use the Linux host code from same page

• If you flash ESP using your source, please use same git commit at ESP and Host.

[liuyuaaa]

我们尝试了以下几点： 1，我们又重新飞线，缩短至3cm，上拉电阻为20k 2，Linux host 版本切换到了0.0.5 3，sdio的时钟频率已降到了5MHz

rpi_init.sh执行后，结果没有变化。

[liuyuaaa]

我们测量发现data2管脚（esp32 gpio12）的电压为2.4v，其他data管脚为3.3v，这一点有没有影响。 是不是因为内部下拉影响了这个管脚

[mantriyogesh]

Worth checking: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/sd_pullup_requirements.html

search for 'Conflicts Between Bootstrap and SDIO on DAT2'

[liuyuaaa]

感谢，问题解决了。 我们测试了sdio的1 bit mode，ESP32是可以正常工作的。这样可以看出data2和data3出问题了，后来发现data2管脚接错了，重新焊接测试下就行了。

[mantriyogesh]

@liuyuaaa: Sure.. Thank you for the update! I hope you get 4 bit mode also running (possibly on PCB)

翻译 Translation for above post: Just for someone landing on this page, the 1 bit mode is working fine now, Problem was that, dat2 was incorrectly soldered.

[mantriyogesh]

@liuyuaaa Can we close this issue?