I have a problem!!!

Question

Hello. 
 This is my code to "wait until micro sd card is pluged". 
 while(1)
{
	disk_state =disk_initialize(0); 
	if(disk_state==RES_OK) 
	{
 NRF_LOG_INFO("Initialize Successful 
");
 break;
	}
	else
	{
 disk_uninitialize(0);
 disk_state = STA_NOINIT;
 diskio_blkdev_t drives[] =
 {
 DISKIO_BLOCKDEV_CONFIG(NRF_BLOCKDEV_BASE_ADDR(m_block_dev_sdc, block_dev), NULL)
 };
 diskio_blockdev_register(drives, ARRAY_SIZE(drives));
 NRF_LOG_INFO("ReInit one more time
");
 delay();
	}
}
 
 But It seems not work. Have any idea for me ?

Jørgen Holmefjord · Accepted Answer

Hi, 
 The issue seems to be related to the SD card initialization and the communication between nrf_block_dev_sdc and app_sdcard . When you call disk_initialize() , block_dev_sdc_init() will be called, which again calls app_sdc_init() . This call will succeed the first time, as the SPI interface is only initialized and a transfer is started, before a success error code is returned. app_sdcard will try to initialize the card, and when this fails, it will uninit itself. Unfortunately, no event is passed to nrf_block_dev_sdc to signalize this, so this module is still initialized. This will result in m_active_sdc_dev being set, even though no SD card is enabled, giving wrong error code returns when you have connected the SD card. 
 [EDIT:] After talking to the developer, we came up with a better solution to this issue. There is in fact an event passed from app_sdcard to nrf_block_dev_sdc when the init of the SD card fails. This event contains an error code/result field, but block_dev_sdc is not uninitialized if field containt an error. The error is however passed to block_dev, where an error reported back to your disk_initialize call. The result of this is block_dev_sdc will be left inited even if an error occurred, causing the issue you are seeing. 
 To solve this issue, you need to do the following changes: 
 
 
 Between line 83 and 84 of the file nrf_block_dev_sdc.c , add the following code: 
 if(p_event->result != SDC_SUCCESS)
{
nrf_block_dev_t const * block_dev = &(p_sdc_dev->block_dev);
ret_code_t err_code = block_dev_sdc_uninit(block_dev);
APP_ERROR_CHECK(err_code);
} 
 
 
 In file app_sdcard.c , remove the call to APP_ERROR_CHECK(app_sdc_uninit()); on line 951. 
 
 
 I will report this bug internally to have it fixed in future SDK releases. 
 Best regards, 
 Jørgen

I have a problem!!!

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