Rockbox Development > New Ports
SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2
mc2739:
@FlynDice
Here is a link to the patch: http://pastie.org/542480
kugel.:
This is the *developement* thread, not the *bug report* thread. Please move bug reports to the official test builds thread.
Hillshum:
I assume I can post bugs with the Clip here, seeing as there is no test thread?
On my Clip, the moment I turn on crossfade, playback crashes. Disabling crossfade gets playback working again (I think a reboot is needed).
funman:
debug -> buffering thread shows the audiobuffer is -244144 bytes (minus 238kB)
FlynDice:
I've been busy studying up on SD cards lately and thought I would pose some questions and observations here as this area seems to have quieted down.
In looking at the code it appears that we assume the internal card is simply another sd card that is embedded in the device. I am speculating that perhaps this is not the case or they are different enough that they need to be treated slightly differently.
It appears we can access the embedded card using the NAND_BASE address and the pl180 offsets so it is at least compatible in this way. It seems to need a higher clock frequency to operate though. Funman mentioned the OF targets 65 MHz for the embedded and 20 MHz for the uSD.
Saratoga tested the frequency for the SD card and found it running at PCLK speed (62MHz) which is too fast for the specand leads me to believe that PCLK = MCLK for the uSD card. We need <=25MHz for standard speed and <= 50MHz for HS. We have to divide MCLK to get the card clock speed MCICLK so our choices here are actually PCLK/2 =31MHz for HS and PCLK/4 = 15.5 MHz for standard speed. Saratoga said the OF uses 16 MHz for standard speed which is the OF PCLK(64MHz) / 4.
The other thing I've been thinking of here is that our embedded card is at least a consistent, fixed object, even if we don't completely know all of it's characteristics, and in fact it seems be less problematic than the uSD card. On the other hand the uSD card can vary in size, speed, and specification and should require a bit more probing for card related info.
Also, I'm assuming we have 2 pl180's working here at the 2 base addresses or am I mistaken?
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