ESP32 SD-Card can no longer be initialised

[stefan.erni]

Hi Ben

Still problem with the sd card.
All the cards are same type and works perfect few month ago.
In the EMG recorder with a pic32 the cards there are all ok ( the program there i did not compile this year)

With softwaremode SPI it's not working anymore and the program is freezing.

I startet a new ESP32 project and added Display and sc-card new. The display is working this way.
The Sd card not but one of the card is working.
The initial clock I set to 400kHz for the card
I have no idea what is going on
regards
Stefan

[medelec35]

Hi Stefan.
There have been some new updates recently.
Can you try again after doing a full database update?

[stefan.erni]

Hi Ben, Hi Martin

I did also the last update, it's the same.

I checked the initial clock speed from the sd-card clock pin and it was 10Mhz (like the display clock)
I actually expected 400khz like the config from the sd-card. So i changed the clock from the display to 400kHz and the SD-card clock was 400khz
and all the 5pcs cards was working.
I put the display clock to 25Mhz and not one card from 5pcs was working.
So I put the display clock to back to 400Khz and all the cards was working.


But it's not so clear... if I set the SD-card 10Mhz and the the display to 400Khz it's not working.

As if the higher clock is used or the 400khz does not work at setup sd-card

regards

Stefan

test1

scope_0.png (28.99 KiB) Viewed 15914 times

test2

scope_1.png (33.01 KiB) Viewed 15914 times

[stefan.erni]

...
I set all the clock to 5Mhz (also the initial clock SD-card) and then it's working


And it's a 5Mhz clock

[stefan.erni]

Hi Ben

It's look like the sd-card Initial speed properties has no effect to the card, if on the SPI bus are a display and a sd-card.
With the disadvantage, the display and sd-card are both slower, they cannot run at their maximum speed.
and the special thing is that it actually works with a wrong (80 Mhz) initial speed.
regards
Stefan

Testresult with different spi-speed

Snag_8c7045.png (15.09 KiB) Viewed 15813 times

[stefan.erni]

Hi Ben

On the ESP32 is still a problem with the (SPI) FAT for the sd-card.
The initial speed properties has no function, so I have to lower the highspeed to the initalspeed to 5Mhz

I get my PIC32 Board and made a test. There the initialspeed is working on the PIC32 nice.

Both PIC32 and ESP32 have the same version of FAT.

And I did the same test as with your new 4bit SD-component. Instead of 1 second it needs 120 seconds with the ESP32 and the (SPI) FAT!

Also a small problem, the oled display on the same SPI bus I have to run slowly with 5Mhz.

Could you look at why the ESP32 makes problems with the FAT initialspeed?

regards

Stefan

Snag_1a2baa4.png (15.54 KiB) Viewed 12948 times

Snag_1a2eadb.png (12.32 KiB) Viewed 12948 times

[BenR]

Hi Stefan,

It sounds like the deisplay might be causing the headaches and stopping the SD card going into high speed mode. Can you attach your test project and I'll have a look.

[stefan.erni]

Hi Ben

Here is my test
I reduce the number of test to 200....
It's need 1 second

regards

Stefan

sd_card_Test2.fcfx

(30.33 KiB) Downloaded 1226 times

Snag_3df870.png (43.63 KiB) Viewed 12881 times

Snag_3afe3b.png (50.49 KiB) Viewed 12881 times

[stefan.erni]

Hi Ben

and stopping the SD card going into high speed mode

It looks more like the initial prescaler with the ESP32 is no longer working. It has no influence on what I choose there.
This means that the speed cannot be reduced to initial the sd-card.
However, it has already worked with the FC9, with the same software and hardware.

regards
Stefan

[stefan.erni]

Hi Ben

On the SPI Bus is a display and a File sd/sdhc.
The File sd/sdhc is just working
if i set set all the SPI Speed to 5Mhz
from the display
and File sd/sdhc InitialPrescalar
and File sd/sdhc Highg Speed Prescaler.

This makes the speed of the device too slow.
In FC9 there, was not a problem to run the Display and SD-Card with more than 20Mhz.
Is there a way to fix this in FC10?

regards
Stefan