Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

NIOS II C language about SDRAM IOWR & IORD function and fopen & fclose

Hi, I'm new about Quartus II & NIOS II. I made hardware part using sopc builder (nios II cpu, sdram, on-chip mem, jtag, sysid, and so on) and composed c source code for software part. I...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

--- Quote Start ---

int main()

{

long input_data1 = 0x0000000011111111;

long input_data2 = 0x1010101010101010;

long output_data1;

long output_data2;

IOWR(SDRAM_0_BASE, 0, input_data1);

output_data1 = IORD(SDRAM_0_BASE, 0);

printf("output data1 = %x\n", output_data1);

IOWR(SDRAM_0_BASE + 1, 0, input_data2);

output_data2 = IORD(SDRAM_0_BASE + 1, 0);

printf("output data2 = %x\n", output_data2);

return 0;

}

--- Quote End ---

I think it is not possible to perform 64 bit IOWR.

If you want to write 64 bit data you have to split it up into 2*IOWR.

Use IOWR twice.

Or am I wrong here? NIOS is 32bit