Cannot run SD / SDMMC example on Olimex Esp32 EVB

[pbecchi]

I have just downloaded last commit and I am trying to run SD example and / or SDMMC example on Olimex EVB board (I am unsure witch one is applicable).
Build is OK but I get "Card Mount Failed" message at run time.
Do I need to change any #define for Olimex EVB board?

[williamesp2015]

I have Maple ESP32 R1 and I had your problem but II could use SD Card after initializing customized SPI Pins
SPI.begin(14,2,15,13);//SCK,MISO,MOSI,ss
delay(10);
if (!SD.begin(13, SPI, 40000000, "/sd")) {
Serial.println("Card Mount Failed");
return;
}

[pbecchi]

Thanks but I have tried your suggested SPi configuration but it doesn't work....I think that Maple and Olimex EVB have different SD connections.
Since EVB board is supported I was thinking that SD example could run with no modifications.

[melvinpmathew]

Did you get this to work?

[pbecchi]

Finally with the help of Olimex this has been sorted out!
They have added one example onhttps://github.com/OLIMEX/ESP32-EVB/tree/master/SOFTWARE
This example is similar to SdMMc core example with following patch SD_MMC.cpp
Modifiing line 45 46

  | host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
  | //host.flags = SDMMC_HOST_FLAG_1BIT; //use 1-line SD mode

To

host.max_freq_khz = SDMMC_FREQ_PROBING;
  | host.flags = SDMMC_HOST_FLAG_1BIT; //use 1-line SD

Can this be done without changing library code?

[fesch]

I also have the Olimex board and as far as I was able to test, only decommenting the "host.flags" line was enough to make the example run.

[pbecchi]

You have to change both lines

[melvinpmathew]

I got it to work only with host.flags = SDMMC_HOST_FLAG_1BIT: The code is as follows:

sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
host.flags = SDMMC_HOST_FLAG_1BIT; 

esp_vfs_fat_sdmmc_mount_config_t mount_config = {
    .format_if_mount_failed = false,
    .max_files = 5
};

[Staubgeborener]

i try to get this to work for over a month now. Still no success. I think my wiring is incorrect (especially the pull ups). Can someone please post a "real" picture of his wiring? @melvinpmathew ?
Everytime when my pull ups (alls pins of my sd card have pull ups, except VCC and both GND) are connected to 3.3V i'll get error messages

waiting of rpacket handler).

When i uncouple vcc from pull ups, i'll get the "normal"

Failed to initialize the card (264). Make sure SD card lines have pull-up resistors in place.

message. So something has to be wrong with my circuit. But like i said, a "real" picture would help me a lot. Which I think of my construction is strange, is the fact, that i cable this way: 3.3VCC -> 10k pull up -> wiring to esp32 gpio's -> sd card adapter on a breadboard. So the datas can be transmitted between esp32 and sd card, but also the gpio's of the esp32 get voltage of the 3.3V + 10k resistors. Hope its clear what i mean. You can see it here.

[fesch]

The "real picture" of my board (Olimex ESP32-EVB) would not help you much. But maybe the circuit will, doesn't it?

[Staubgeborener]

Yeah, i also found this example. But thats no really help me. Is this only for 1 bit? Only IO15, IO2 and IO14 are connected. DAT1, DAT2 and DAT3 are only with 10k pull ups at 3.3V? Actual i'm a little deperate after weeks of a not well working sd card. So here you can see my setup. Not very beauty, but it shows perfectly my circuit. May you see at first attempt the issue.

Edit: Just tried again this setup. Internal blue LED is glowing timeout waiting for paket handler. I almost think it has something to do with IO12

[fesch]

No. I suppose there are reference to other GPIO's. I also found this:

[Staubgeborener]

Maybe my pinout is not the same in this case. I've got an esp32 from doit.am. Can not imagine it, but i just wrote doit.am to send me the pinout. I use everytime this one and its also works everytime like a charm. But maybe not in this case...?

Where did you found this picture, @fesch ?

[fesch]

Just here:
https://github.com/OLIMEX/ESP32-EVB/blob/master/HARDWARE/REV-B/ESP32-EVB_Rev_B.pdf

[fesch]

You own this board, right?

https://github.com/SmartArduino/SZDOITWiKi/wiki/ESP8266---ESP32