About DMA problem..please help me

Hy everyone ..

I am trying to experiment with this DMA things too.

The result:

testing ssram & sdram : dma operation 
content of ssram_0:before DMA operation 
0: 0 
1: 1 
2: 2 
3: 3 
4: 4 
5: 5 
6: 6 
7: 7 
8: 8 
9: 9 
10: a 
11: b 
12: c 
13: d 
14: e 
15: f 
content of sdram_1:before DMA operation 
0: 0 
1: 0 
2: 0 
3: 0 
4: 0 
5: 0 
6: 0 
7: 0 
8: 0 
9: 0 
10: 0 
11: 0 
12: 0 
13: 0 
14: 0 
15: 0 

I don'd get the result after that.. seems like it stuck on

while(!txrx_done);

or txrx_done never go to 1 ?

Besides, "content of sdram_1:before DMA operation " is always changing. Sometimes it'll become :

0: 33
1: 33
2: 33
3: 33
4: 33
5: 33
6: 33
7: 33
8: 33
9: 33
10: 33
11: 33
12: 33
13: 33
14: 33 
15: 33

Any reply will be appreciated Thank you:-P

Yuyex:o