[ECOS] Mounting fatfs using mmc_spi on at91sam7sek

[ECOS] Mounting fatfs using mmc_spi on at91sam7sek

[Rune Sørensen]

Dear all,

I'm new to eCos (as well as this mailing list) so I hope my issue is
pretty basic.
I am trying to mount fatfs on a sdcard connected using spi, but the
mount() call never returns. More specific, it seems that a mutex lock
in mmc_spi_send_init() never becomes locked:

spi.c :

cyg_spi_transaction_begin(cyg_spi_device* device){
.
.
    while (!cyg_drv_mutex_lock(&(bus->spi_lock))); 	<------ Does not return
.
}

I am wondering if I am using the spi implementation correctly. This is
my testcode:

-------------------------------------------------------------

cyg_spi_device *cyg_spi_mmc_dev0;
cyg_spi_at91_device_t spi_at91_mmc_dev0 CYG_SPI_DEVICE_ON_BUS(0);

void test_main(CYG_ADDRESS id)
{
	int err = -1;

	cyg_spi_mmc_dev0 = &spi_at91_mmc_dev0.spi_device;
	spi_at91_mmc_dev0.spi_device.spi_bus = &cyg_spi_at91_bus0.spi_bus;
	spi_at91_mmc_dev0.dev_num = 0; 		// Device number
	spi_at91_mmc_dev0.cl_pol = 0; 		// Clock polarity (0 or 1)
	spi_at91_mmc_dev0.cl_pha = 1; 		// Clock phase (0 or 1)
	spi_at91_mmc_dev0.cl_brate = 5000000; 	// Clock baud rate
	spi_at91_mmc_dev0.cs_up_udly = 0; 	// Delay in usec between CS up and
transfer start
	spi_at91_mmc_dev0.cs_dw_udly = 0; 	// Delay in usec between transfer
end and CS down
	spi_at91_mmc_dev0.tr_bt_udly = 0; 	// Delay in usec between two transfers
	spi_at91_mmc_dev0.init = false; 		// Trigger initialization

	// Test if spi is working - output ok on the oscilloscope!
	cyg_uint8 Test[] = { 0xAA, 0xAB, 0xFF };
	cyg_spi_transaction_begin(cyg_spi_mmc_dev0);
	cyg_spi_transaction_transfer(cyg_spi_mmc_dev0, 0, sizeof(Test), Test, NULL, 0);
	cyg_spi_transaction_end(cyg_spi_mmc_dev0);

	diag_printf("trying to mount sdcard...");
	err = mount("/dev/sdcard/1", "/sdcard", "fatfs"); //<----- Does not return
	if (err < 0)
	{
		diag_printf("mount() unsuccessfully completed\n");
	}
}

static cyg_handle_t thread_handle;
static cyg_thread thread;
static char stack[CYGNUM_HAL_STACK_SIZE_TYPICAL+1024];

externC void cyg_start( void )
{
	cyg_thread_create(1,test_main,0,0 &stack[0], sizeof(stack),
&thread_handle,	&thread);
	cyg_thread_resume(thread_handle);
	cyg_scheduler_start();
}

-------------------------------------------------------------

Does anyone have any examples regarding the use fatfs on sdcard/mmc?


Best regards,

Rune Aa. L. Sørensen

Re: [ECOS] Mounting fatfs using mmc_spi on at91sam7sek

[Andrew Lunn]

On Thu, Aug 09, 2007 at 04:15:36PM +0200, Rune S??rensen wrote:
> Dear all,
> 
> I'm new to eCos (as well as this mailing list) so I hope my issue is
> pretty basic.
> I am trying to mount fatfs on a sdcard connected using spi, but the
> mount() call never returns. More specific, it seems that a mutex lock
> in mmc_spi_send_init() never becomes locked:
> 
> spi.c :
> 
> cyg_spi_transaction_begin(cyg_spi_device* device){
> .
> .
>     while (!cyg_drv_mutex_lock(&(bus->spi_lock))); 	<------ Does not return
> .
> }

If you define DEBUG in
packages/devs/disk/generic/mmc/current/src/mmc_spi.c what do you see?
Does it find the MMC card? Does it read the partition table?

     Andrew

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Re: [ECOS] Mounting fatfs using mmc_spi on at91sam7sek

[Rune Sørensen]

On 8/9/07, Andrew Lunn <andrew@lunn.ch> wrote:
> On Thu, Aug 09, 2007 at 04:15:36PM +0200, Rune S??rensen wrote:
> > Dear all,
> >
> > I'm new to eCos (as well as this mailing list) so I hope my issue is
> > pretty basic.
> > I am trying to mount fatfs on a sdcard connected using spi, but the
> > mount() call never returns. More specific, it seems that a mutex lock
> > in mmc_spi_send_init() never becomes locked:
> >
> > spi.c :
> >
> > cyg_spi_transaction_begin(cyg_spi_device* device){
> > .
> > .
> >     while (!cyg_drv_mutex_lock(&(bus->spi_lock)));    <------ Does not return
> > .
> > }
>
> If you define DEBUG in
> packages/devs/disk/generic/mmc/current/src/mmc_spi.c what do you see?
> Does it find the MMC card? Does it read the partition table?
>
>      Andrew
>

This is the debug output:

SPI: spi_at91_init_bus[170]: bus base fffe0000
Entering cyg_user_start() function
test() trying to mount sdcard...
mmc_spi_send_init(): dev pointer 0x0x00201d80, 0
                   : begin pointer 0x00000000

Taking a look at the pointer to the spi structure used in
mmc_spi_send_init() it seems that the pointer does not point to a
valid structure (e.g. begin pointer is zero, the value of the spi_lock
mentioned earlier is bogus). So no, it does not find the MMC card or
the partition table since the spi communication has not been
established.


No one have a working example I can take a look at?

Best regards,

Rune

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