FS#10729 - AMS Sansa: Use 4bit Widebus mode for SD transfers.

Attached to Project: Rockbox
Opened by Jack Halpin (FlynDice) - Tuesday, 27 October 2009, 13:36 GMT
Last edited by Jack Halpin (FlynDice) - Sunday, 13 December 2009, 21:12 GMT
Task Type Patches
Category Operating System/Drivers
Status Closed
Assigned To No-one
Operating System Another
Severity Low
Priority Normal
Reported Version Release 3.4
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


This patch attempts to use the 4 bit widebus mode for the uSD card. Right now we have the cards operating in single bit bus mode. With this patch I can browse files on the uSD and display album art from the card but playback will not work and I'm not sure why. I'm not getting any transfer error messages, it's just hanging on playback. I'm thinking that the bus being 4 times as wide is filling the FIFO quicker and perhaps introducing some kind of timing issue? What do you think?
This task depends upon

Closed by  Jack Halpin (FlynDice)
Sunday, 13 December 2009, 21:12 GMT
Reason for closing:  Fixed
Additional comments about closing:  Fixed with r23977