[ECOS] reading size and used space on compact flash (CF) card?

[Frank Pagliughi]

On 06/29/2012 09:15 AM, Ken Yee wrote:
> ...
>          } else {
>              error = cyg_io_get_config(cf_handle,0,&cf_info,&len); //
>              //printf("cf get_config error: %i %i\n",error,-EINVAL); // should get -EINVAL???
>              uint32_t block_size = cf_info.block_size;
>              uint32_t blocks_num = cf_info.blocks_num;
>              uint32_t phys_block_size = cf_info.phys_block_size;
>              bool is_connected = cf_info.connected;
>
> ...
> But as mentioned in the code, it's returning crazy numbers in the 33MB range no matter what size CF card I install (I've tried 32MB and 128MB :-(
> Is there any other official API to read the size of it or any other IDE devices?
>

You are not using the proper key when querying for the disk information. 
You need to use CYG_IO_GET_CONFIG_DISK_INFO (not zero) as in:

     error = cyg_io_get_config(cf_handle, CYG_IO_GET_CONFIG_DISK_INFO, 
&cf_info, &len);

When you use the unrecognized key of zero, the function returns the 
error code -EINVAL because it doesn't recognize the query. With the 
proper query the function should return 0 for success.

Frank

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