Hi,
Dev setup:
Segger embedded studio - fatfs example - SD card - nrf52832
I am able to write to sd card and see data. But while reading i am failing.
Below is code i tried from example.
static void fatfs_example()
{
static FATFS fs;
static DIR dir;
static FILINFO fno;
static FIL file;
uint32_t bytes_written;
FRESULT ff_result;
DSTATUS disk_state = STA_NOINIT;
// Initialize FATFS disk I/O interface by providing the block device.
static 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("Initializing disk 0 (SDC)...");
for (uint32_t retries = 3; retries && disk_state; --retries)
{
disk_state = disk_initialize(0);
}
if (disk_state)
{
NRF_LOG_INFO("Disk initialization failed.");
return;
}
uint32_t blocks_per_mb = (1024uL * 1024uL) / m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_size;
uint32_t capacity = m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_count / blocks_per_mb;
NRF_LOG_INFO("Capacity: %d MB", capacity);
NRF_LOG_INFO("Mounting volume...");
ff_result = f_mount(&fs, "", 1);
if (ff_result)
{
NRF_LOG_INFO("Mount failed.");
return;
}
NRF_LOG_INFO("\r\n Listing directory: /");
ff_result = f_opendir(&dir, "/");
if (ff_result)
{
NRF_LOG_INFO("Directory listing failed!");
return;
}
do
{
ff_result = f_readdir(&dir, &fno);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Directory read failed.");
return;
}
if (fno.fname[0])
{
if (fno.fattrib & AM_DIR)
{
NRF_LOG_RAW_INFO(" <DIR> %s\r\n",(uint32_t)fno.fname);
}
else
{
NRF_LOG_RAW_INFO("%9lu %s\r\n", fno.fsize, (uint32_t)fno.fname);
}
}
}
while (fno.fname[0]);
NRF_LOG_RAW_INFO("");
NRF_LOG_INFO("Writing to file " FILE_NAME "...");
ff_result = f_open(&file, FILE_NAME, FA_READ | FA_WRITE );
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ".");
return;
}
ff_result = f_write(&file, TEST_STRING, sizeof(TEST_STRING) - 1, (UINT *) &bytes_written);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Write failed\r\n.");
}
else
{
NRF_LOG_INFO("%d bytes written.", bytes_written);
}
(void) f_close(&file);
NRF_LOG_INFO("Reading from file " FILE_NAME "...");
ff_result = f_open(&file, FILE_NAME, FA_READ );//| FA_WRITE );
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ".");
return;
}
//f_gets(READ_STRING,10,&file);
ff_result = f_read(&file, READ_STRING, 10, (UINT *) &bytes_written);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("read failed\r\n.");
}
else
{
NRF_LOG_INFO("data :%d %s.",bytes_written, READ_STRING);
}
(void) f_close(&file);
return;
}
Quastion 1 : I have seen other threads but no help regarding reading file. Can you check if i am missing anything.
Quastion 2: I have a file with multiple lines, where i want read line by line by using f_gets(). But it shows error when call functions like f_gets() or f_printf in fatfs example code
It says undefined reference. But all other functions are working fine
Thanks,
Suresh
