CCS/TDA3LA: Buffer management problem with SDIO interface

In addition to question.

Needed bits in PSTATE register WTA (write transfer active) and BWE (buffer write enable) are in High state. They indicate that the buffer is ready to transfer

Hi, Stan

Are you sure?

Because now I see in datasheet, that TDA3x supports MMC/SD/SDIO

Stan,

Okay) But... A few days ago I managed it. I made simple block write operations (not Write Protect). So how do you expalin it?

According to those facts it's so strange.

Well, I'll try to do Write Protect operations

Ivan,

It was only my supposition. It was because you were waiting for write operation to complete and this never happened (your initial post) . I can't really say what could be the exact issue.

Hi, Stan

I'll try to describe how I wrote a data to SD card occasionally (before I asked about this problem on this thread)

Procedure of writing consist of some steps (generally):
(1) preparing BWR bits in MMC_IE register
-> (2) sending command with CMD line
-> (3) waiting for BWE in MMC_STAT register
-> (4) sending data.

So, this function hasn't worked, but... When I've set a breakpoint between steps (1) and (2) it has worked. 
After this actions I repeated this function without breakpoint and it still worked. 

When I restarted the TDA3 device then, I needed to repeat the operation with breakpoint. 

Then I decided to make reading function. I tested it and then my writing function started to work incorrectly (and it's not working now)

How can the breakpoint actions affect the writing function?

I've just tried to do a write protect operations

So, as I see in SD Spec Part1, both SDHC and SDXC cards don't support Write Protect operations.

In accroding to these words I've just checked Write Prot. operations and SD card doesn't respond to these commands

Stan,

I still don't understand something.

You said: SD/MMC memory cards are not supported.

But sometimes writing operations ended successfully after breakponits, but SW polled all needed flags in status register

Where is the mistake...

In addition to this - write protect operations aren't supported by SDHC and SDXC cards

Well, I've searched some examples in PDK driver and CSL, so... mostly my SW consist of functions from those libraries and patterns.

Hi, Stan

I work with evaluation board (I've forgot to notice that, maybe it's famous)

But
I've found the mistake!

As you see on the picture I need to poll BWR bit in MMC_STAT register to write data into the buffer. But this bit is always zero after preparing BWR bit in MMC_IE register and sending CMD.

In according to reference manual, after I sent CMD, both WTA bit and BWE bit became 1 in MMC_PSTATE

But BWR bit in MMC_STAT is still 0.
When I learnt the examples from PDK driver I saw that SW polls the BWR bit MMC_STAT too.

So, I decided to poll BWE bit in MMC_PSTATE (instead of BWR bit in MMC_STAT) and it started to work. It really works!

Is there a mistake in reference manual or/and in PDK?

Stan,

I've just checked the configuration of SDIO controller. So, SDIO controller isn't in DMA mode.

Maybe I could miss something, but I didn't configure DMA mode in SDIO controller, and all the bits in SDIO controller registers which related to DMA mode are zeros.

Have you ever had any issues like this? I ask you because I haven't found it before.