LPCXpresso IDE中的主题 Re: Sd card speed

Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:22 GMT

Content originally posted in LPCWare by james on Thu Feb 02 01:23:30 MST 2012
Hi guys, sorry for more SD card questions.

Is it possible to initialize the SD card when the program starts and use f_write / f_read multiple times without dismounting the card?

R/W to the sd card is fast but the initialization takes approx 500ms ~ 800ms my program seems to crash if I do other processes without dis-mounting the SD card.

I am using EFSL

Re: Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:23 GMT

Content originally posted in LPCWare by dragilla on Thu Feb 02 04:00:53 MST 2012
I never unmount the sd-card. I initialize everything at the beginning and it stays mounted the whole time.

Re: Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:23 GMT

Content originally posted in LPCWare by james on Thu Feb 02 18:46:07 MST 2012
thanks for the reply, which filesystem are you using? efsl or fatfs?

Re: Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:24 GMT

Content originally posted in LPCWare by james on Fri Feb 03 01:14:10 MST 2012
update*

Without dis mounting, reading from the sd card is fine, however i cant seem to write anything into the sd card without un mounting after i write any file. Can anyone who can write into the sd card without un mounting please post some tips?

Re: Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:24 GMT

Content originally posted in LPCWare by OXO on Fri Feb 03 04:29:33 MST 2012
EFSL or FATFS? :)

Re: Sd card speed

lpcware — Thu, 16 Jun 2016 02:49:25 GMT

Content originally posted in LPCWare by james on Sun Feb 05 11:42:23 MST 2012
I am using efsl, from the efsl demo provided by codered.
I cant seem to port the fatfs example from nxp even though the pins are exactly the same :(