Read from sequential file

PaulF

Hi,
as I'm new to the propellor chip and microcontrollers in general I'd like to know if it is possible by using the VDrive (Vinculum chip) to read a number of characters (8) from a large txt file (> 16Mb) located on a Thumb drive, beginning at a particular location, then consecutively read the next set of 8 characters and so on. I ask because I'm considering purchasing the VDrive for a project, but I'm not sure if this can be 'relatively' easily done. Are there any other better (easier) solutions. I could use CF or SD cards if tis were to make the process easier.
Any help would be greatly appreciated.

Mike Green

Yes, it should be pretty easy. Read the Vinculum firmware manual that you can download from www.vinculum.com

There is a seek command that takes an absolute address within a file and positions the file to that location for subsequent operations (like reads). When you specify a read, you indicate how many characters are to be read.

PaulF

Thanks Mike,
just looked at the manual. Am I correct in saying that when I use seek it goes to that location. Then to read 8 characters from that location I use RDF 8 and is it also true that if I use WRF 8 it will overwrite any existing data with the new data?

PaulF

Thanks Mike,
just looked at the manual. Am I correct in saying that when I use seek it goes to that location. Then to read 8 characters from that location I use RDF 8 and is it also true that if I use WRF 8 it will overwrite any existing data with the new data?

PaulF

Thanks Mike,
just looked at the manual. Am I correct in saying that when I use seek it goes to that location. Then to read 8 characters from that location I use RDF 8 and is it also true that if I use WRF 8 it will overwrite any existing data with the new data?

PaulF

Sorry for the multiple posts, I'm having some difficulty with my new Broadband connection.