I am using atmega1284p and I need to read data from sd card and send audio decoder chip I can do it for low bitrates,higher bitrates MCU struggle to send data on time. Respect to my research to achieve the high bitrates, files can be read muliple block and after reading first block there is no delay.I allocated my multi block buffer but dont know how to read blocks in multiple way with ELM Chans FATFS library .Can F_read do this, or any other suggestion.
AVR and FATFS Multiple block read
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You have to tell
f_read()
that you want to read more than a block size worth of bytes.This says that if
f_read()
is given an amount of bytes to read [btr
] that is more than the Sector Size of the filesystem [SS(fs)
], then do a multiblock read ofcc
blocks staring at blocksect
.Note: A sector on a disk is analogous to a block on an SD card.