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Forum Index : Microcontroller and PC projects : SD Card help

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jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 11:50pm 08 Jul 2017

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Hi
Could somebody post an example of the required synatx for the DIR$ function
"DIR$( fspec, type )
Will search an SD card for files and return the names of entries found."

And while we are at it is a there a simple way to check if an SD card is present?

Regards
Jman

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10565

Posted: 12:41am 09 Jul 2017

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dir$ is a function that returns one filename at a time

type can be DIR, FILE, or ALL
fspec is a search string

so

a$=dir$("*.bas",FILE)

will return the first filename with the extension ".bas"

a$=dir$("*",DIR)

will return any sub directories

To get subsequent files/directories with the same search parameters use

a$=dir$()

if a$="" then end of matching files

Quote And while we are at it is a there a simple way to check if an SD card is present?

If the sdcard has a card detect pin enabled in the OPTION command then you can read this with a normal PIN(n) function, otherwise no

Edited by matherp 2017-07-10

jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 09:41am 09 Jul 2017

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Thank you Peter
That explains it perfectly.

Regards
Jman

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