[En-Nut-Discussion] Ethernut 5: Problem with MMC mounting

[Markus Dost]

Hi Harald,

I tried your suggestion and checked the power supply of the card. But  
it is ok (3,3 V).
Do I have to include some special libraries? I use these (like in the  
example http://www.ethernut.de/nutwiki/Writing_PHAT_Files):
    #include <dev/board.h>
    #include <fs/phatfs.h>
    #include <stdio.h>
    #include <io.h>
    #include <fcntl.h>
Best regards,
Markus

Am 23.02.2012 um 11:20 schrieb Markus Dost:

> Hi,
>
> I want to use a SD-Card on my Ethernut5-Board and try to mount it with
> the following code:
>
> #ifdef USE_MMCSD
>     int mmc_volume;
>     printf("\nRegister PHAT...");
>     if (NutRegisterDevice(&devPhat0, 0, 0)){
>     	puts("failed");
>     }
>     else {
>     	puts("OK");
>     	printf("Register %s...", DEV_MMCARD0_NAME);
>     	if (NutRegisterDevice(&DEV_MMCARD0, 0, 0)){
>     		puts("failed");
>     	}
>     	else {
>     		puts("OK");
>     		printf("Mounting MMC-/SD-Card...");
>     		NutThreadYield(); //enable Interrupts
>     		mmc_volume = _open(DEV_MMCARD0_NAME ":1/PHAT0", _O_RDWR |
> _O_BINARY);
>     		if (mmc_volume == -1){
>     			printf("failed: error %d\n", errno);
>     		}
>     		else {
>     			puts("OK");
>     		}
>     	}
>     }
> #endif /* USE_MMCSD */
>
> The registrations of the PHAT file system and the MMC-/SD-Card driver
> work. But the command _open() cannot access my card and fails with the
> error code 19 (ENODEV).
>
> The Nut/OS-Version is 4.10.1 and the card is a Canon SDC-32M with 32  
> MB.
>
> Does anybody have an idea what I've made wrong?
>
> Best regards,
> Markus
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