CCS/TMS570LS3137: Maximum Array Size Of TMS570LS3137 HDK When Using SDRAM

user4958934

Part Number: TMS570LS3137
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

Hello,

I write a program to test SDRAM on my TMS570LS3137 HDK, but there is a problem with it. Im sure that all configurations are correct (EMIF timings, PINMUX, Adding SDRAM address to linker etc.). This is the sys_main.c;

#define testSize 300000

int Test[testSize];

for(int i=0; i<testSize; i++)

{

Test[i]=i;

}

The values must increase like 0,1,2,3,4,5,6... but in Memory Browser I see those values at their addresses:

Test[0] = 256

Test[1] = 257

Test[2] = 258

Test[3] = 259

........

Test[256] = 256

Test[257] = 257

....

When I debug the code step by step, the values are increasing normally until i=256

Test[0] = 0

Test[1] = 1

Test[2] = 2

...

When i=256, just Test[256] must be equal to 256 but Test[0] becomes 256 too

When i=257, just Test[257] must be equal to 257 but Test[1] becomes 257 too

...

Please help me solve this. What would be wrong?

Best Regards,

Aslan

Edit: I also tried the code with an uint16 array.

over 8 years ago

0 QJ Wang over 8 years ago

TI__Guru**** 198766 points

Hello Aslan,

TMS570LS3137 has 256KB RAM. The array you defined in your code is 292KWORD (32-bit) which is much larger than the SRAM size.

Regards,
QJ

0 user4958934 over 8 years ago in reply to QJ Wang

Prodigy 190 points

Hello QJ Wang,

As I said I'm using SDRAM and it has 8MB capacity. I can succesfuly build it. There is no problem with it.

Thanks and Regards,
Aslan

0 user4958934 over 8 years ago in reply to user4958934

Prodigy 190 points

Hello,

I solved my problem with changing a line in emif.c,
I'm writing it here so if someone has same problem, he/she can fix it. Don't forget to use only 16 bit values with ISSI 42IS16400F model SDRAM because it has 16 bit data bus!

In emif.c there is a function initializes EMIF at startup and there is this code at the last line of that function,

*((unsigned char *)(&emifREG->SDCR)+0x0U) = 0x80;

If someone faces same problem, he/she must change it with the following one;

*((unsigned char *)(&emifREG->SDCR)+0x3U) = 0x80;

Thanks and Best Regards,

Aslan

0 QJ Wang over 8 years ago in reply to user4958934

TI__Guru**** 198766 points

Hello Aslan,

The code generated by the latest version of HALCoGen is correct which the same as your modified code. Please update your HALCoGen to the new version (4.6.1). Thank you so much.

This is the code generated by HALCoGen 4.6.1:

Regards,

0 user4958934 over 8 years ago in reply to QJ Wang

Prodigy 190 points

Hello QJ Wang,

I'm going to update it, thank you so much.

Best Regards,
Aslan

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CCS/TMS570LS3137: Maximum Array Size Of TMS570LS3137 HDK When Using SDRAM