Has anyone used the sound capabilities on the DK?

Hi Dapper,

the sound chipset on the AT91RM9200-DK is not usable. The AC97 mode of the serial synchronuous controller (SSC) has been removed from the datasheet since a while. Thus, this makes the AC97 audio chip on the DK useless. Now, the AC97 chip is not mounted anymore on the board. What you can you if you do not really need the AC97 feature in your application, you can use a I2S audio DAC like the micronas 3550. See the application note on ATMEL website about that.

Hope this helps.

I've looked at the code and have added it to a linux driver file. I am getting an interrupt, but I don't see anything coming out of the SSC port. Any ideas on what I should look at?

I've tracked down the problem to something with the PDC. I can send data out directly to the port, but it won't send anything out when using the PDC.
Any ideas?

On AT91RM9200-EK I am testing the DAC3550, which is interfaced to ARM9 by means of SSC1.
I follow the guidelines reported in 6020A-ATARM-11/03 "Connecting the ATMEL SSC to an I2S bus"
TF1 and TK1 are regularly generated..
The problem is that TD1 is always low !

However:
1)PDC pointers and counters are regularly updated, just as DMA is regularly working.
2)PDC status signal that Transmit is enabled.
3)If I disable PDC and transmit data writing by software to TDHR, data bits TD1 appear regularly on TD1.

Could you at last find where the problem is ?

Thank you for your attention.

Look in Linux->using PDC with SSC.
Someone sent a reply about the same problem you and I are having, but I haven't had time to look into it any further. If you get everything working, I'd be interested in your driver.

Yes, I found the hint correct.
The fact is that PDC pointers are DMA pointer, that are not concerned vith
operating system virtual address !

If
vector = (int *)kmalloc(16,GPP_KERNEL|_GPP_DMA):

// pSSC_>SSC_TPR = (AT91_REG)(vector); wrong assignment !

So you have to use the virt_to_bus function to set the PDC address:

pSSC_>SSC_TPR = (AT91_REG)virt_to_bus(vector);
pSSC_>SSC_TCR = 16;

vector = (int *)kmalloc(16,GPP_KERNEL|_GPP_DMA):

Once this is done, TD1 actually sends out data, as soon TF1/TK1 start.

Hope this help.

As soon I arrange the PDC update by means of IRQ - in order to have continuous output- I can send you the driver source of the application example..