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Incorrect read data from sdram in NIOS using IORD_16Direct

Altera_Forum
Honored Contributor II
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Hello, i have a problem with reading data from sdram in nios using IORD_16direct. There is my code of sending data to sdram. 

 

for(i = 0; i < 10; i++) { 

int chromosome[30] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 }; 

 

 

int randomFirstPoint = onGetRandom(0, 29); 

int randomSecondPoint = onGetRandom(0, 29); 

 

 

int buff = chromosome[randomFirstPoint]; 

chromosome[randomFirstPoint] = chromosome[randomSecondPoint]; 

chromosome[randomSecondPoint] = buff; 

 

 

for (j = 0; j < 30; j++) { 

IOWR_16DIRECT(DRAM_BASE + count, 0, chromosome[j]); 

count++; 

 

and there is my code of redaing from sdram 

 

for(i = 0; i < 300; i++) { 

int value = IORD_16DIRECT(DRAM_BASE + i, 0); 

printf("read value = %d %d\n", value, i); 

 

output is  

 

read value = 1 

read value = 0 -- incorrect value instead of this would be 2 

read value = 3 

read value = 16128 -- incorrect value instead of this would be 4 

read value = 5 

read value = 0 -- incorrect value instead of this would be 6 

read value = 7 

read value = 16128 -- incorrect value instead of this would be 8 

read value = 9 

read value = 0 -- incorrect value instead of this would be 10 

and so on...
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Altera_Forum
Honored Contributor II
381 Views

I don't undestand what it is a forum if nobody can't help me?

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Altera_Forum
Honored Contributor II
381 Views

Hi Nurbek, 

 

Debug the code using following steps. 

1.Print the write and read address and verify. 

2.Or instead of for loop can try something much simpler(write to two address and read from the two without loop) if u succeed try with loop.  

 

Best Regards, 

Anand Raj Shankar 

(This message was posted on behalf of Intel Corporation)
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