Problems with builtin sd card

[rcmz]

Hello, I'm trying to make an portable music player with a teensy 3.6.

I'm having some trouble with the builtin sd card reader.
Most of the time, sd begins fails with the following errors codes :
0x24 (SD_CARD_ERROR_DMA - DMA transfer failed)
0X08 (SD_CARD_ERROR_CMD10 - Read CID data)

Sometimes, out of nowhere, it works. It seem to have a better chance of succeeding if
i try just after letting my teensy unplugged for a long time (maybe it's tired ?).

To me that sounds like a hardware / wiring problem, but I'm new to this stuff.
My teensy is soldered to an audio adaptor board and connected to a ssd1351
oled screen through a breadboard.

Here is my test code :

include <SdFat.h>

void setup() {
    Serial.begin(9600);
    while (!Serial);

    SdFat sd;
    if (!sd.begin(BUILTIN_SDCARD)) {
        sd.initErrorPrint();
    } else {
        Serial.println("success !");
    }
}

void loop() {
}

Do you have any idea of what could be going on ?

[PaulStoffregen]

Are you using version 1.53?

In 1.54 we're changing SD and switching to SdFat version 2 (until very recently called SdFat-beta). Might be worthwhile to uninstall SdFat and give the 1.54-beta5 a try.

https://forum.pjrc.com/threads/64592...no-1-54-Beta-5

Starting with 1.54-beta3, when you use SD, it's really using SdFat internally, and it's the newer SdFat. If you're starting a new project, probably best to get started on 1.54-beta5, so you don't end up building a lot of code which is likely to break with the upcoming 1.54 release.

[rcmz]

Thanks for your response !
I tried with this latest version of teensyduino,
sadly it doesn't change anything :'-(

[Frank B]

Have you tried other cards?

[PaulStoffregen]

I ran it here with the latest beta using Teensy 3.6 and a Samsung 32 EVO Plus in the built in SD socket. Uploaded 10 times. It printed "success !" every time.

[rcmz]

I've tried with one other card, same thing.
I will try with more once I get my hands on some.

[Frank B]

Maybe a connection is not good.
Are there any wires between the Audioshield and the Teensy, or are you using pinheaders?

[rcmz]

The audio shield is connected using pinheaders, but I haven't soldered every pin.

[rcmz]

I ran it here with the latest beta using Teensy 3.6 and a Samsung 32 EVO Plus in the built in SD socket. Uploaded 10 times. It printed "success !" every time.

Well I gess that's good news !

[Frank B]

You should solder at least the needed pins (for the Audiochip and SD, GND and so on..)

[rcmz]

Well I guess I will try that tomorow.
But the internal SD is not suppose to interfere with the audio shield pins, am I correct ?

[Frank B]

Ah, of course..you're using a Teensy with inbuilt slot. No, in this case it is not needed.

[rcmz]

oh ok,
I should add that I seem to remeber that this problem was not happening a couple days ago. Could I have fried something while soldering / connecting something badly ?

[PaulStoffregen]

Normally the audio shield should not have any impact on the built in SD socket on Teensy 3.6. None of the signals are shared, only power.

[Frank B]

SD cards can sometimes draw a lot of current. Maybe look there? Depends on what else you have connected...
I remember I had similar problems, a long time ago. It helped to solder a 100uF cap to the Teensy 3v3+GND pins near the slot, but I'm not 100% sure if that was reason that it began working..
Maybe it was just a problem with the slot and the repeated card-inserts solved it...

@Paul, yes, I wrote this.

[rcmz]

Well I guess the audio shield + oled screen could be too much of a power draw.
Thanks I'll look in that direction tomorow !

[rcmz]

SD cards can sometimes draw a lot of current. Maybe look there? Depends on what else you have connected...
I remember I had similar problems, a long time ago. It helped to solder a 100uF cap to the Teensy 3v3+GND pins near the slot, but I'm not 100% sure if that was reason that it began working..
Maybe it was just a problem with the slot and the repeated card-inserts solved it...

@Paul, yes, I wrote this.

Actually that story rings a bell, I migh have red one of your post previously ^^