Running the SDBLOCKDEVICE example code

Questions » Running the SDBLOCKDEVICE example code

john mayer

5 years, 3 months ago.

Hello, i'm using the NUCLEO F411RE board, together with a DIGILENT PMODSD card board. To access this SD card I'm trying to compile the example present in the following link: https://os.mbed.com/docs/mbed-os/v5.13/apis/sdblockdevice.html

However this code does not compile, and the only error I get is: "Internal Error", with no other details. I'm stumped. I've also attached the code files/media/uploads/ryudas/main.cpp , as well as the images of the json objects and project structure /media/uploads/ryudas/screen_shot_2019-08-14_at_11.59.25_am.png

I've tried changing quite a few things, to no avail

1 Answer

Zoltan Hudak

5 years, 3 months ago.

Hello John,

Because you have the mbed library attached to your project you are trying to build an Mbed OS-2 (aka Mbed Classic) program. However, the SDBlockDevice is designed for Mbed OS-5:

Delete your current SDCardTest project from the online compiler.
When creating a new one, make sure you select an Mbed OS-5 template. For example Blinky example for mbed OS 5.0 ... . Once created, you should see the mbed-os library attached to the new SDCardTest project rather than the mbed one.
Replace the main.cpp with the one from the SDBlockDevice example.
Add the mbed_app.json file (with the same content as before).
Do not add the targets.json file.

For more examples have a look at:

Thank you very much for your response. I dont get an internal error anymore, however I do get : Error: Could not parse mbed app configuration from /tmp/chroots/ch-1ba86681-6b4b-4fc3-9638-df40ede89799/src/mbed_app.json, although I followed the examples yet again.

Would you know why this json is not being parsed?

Thanks again for all your help

posted by john mayer 19 Aug 2019

Copy & paste the following text into the mbed_app.json file. It worked fine for me:

mbed_app.json

{
    "target_overrides": {
        "*": {
            "target.components_add": ["SD"],
            "sd.SPI_MOSI": "D11",
            "sd.SPI_MISO": "D12",
            "sd.SPI_CLK": "D13",
            "sd.SPI_CS": "D9"
        }
    }
}

Repeat compilation until it succeeds.

posted by Zoltan Hudak 19 Aug 2019

Unfortunately it is still unsuccessful. Thank you for your help.

posted by john mayer 09 Sep 2019

john mayer

Important changes to forums and questions

5 years, 3 months ago.