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
