Hello!
How I can speedup of execution my program on NIOS 2?
I'm trying to make calculation of video data before output it to
monitor, but cpu makes it very slowly. I want to calculate video sprites and
alpha chanal.
System clock and SDRAM clock are 100 MHz,
Nios CPU is f-version with icash=2K and dcash=1K,
I'm using EP1C6Q240C6.
Program memory and video memory are working on the different SDRAM controllers
(2 video chips and 1 program chip). The data to video controller are transmitting by DMA.
For example this operation execute very slowly:
*****
unsigned char *mem = ... program memory //(16 bits data bus)
unsignde char *vmem = ... video memory //(8 bits data bus)
*****
//Write to video memory some sprite
for (int i=600; --i; )
for (int j=800; --j; )
if (*mem != 0xF7) {
*--vmem = *mem;
mem--;
}
*****
//Transmitting to VGA
IOWR_ALTERA_AVALON_DMA_STATUS(SD_DMA_BASE, 0);
IOWR_ALTERA_AVALON_DMA_RADDRESS(SD_DMA_BASE, (int)vmem);
IOWR_ALTERA_AVALON_DMA_WADDRESS(SD_DMA_BASE, SD_BASE);
IOWR_ALTERA_AVALON_DMA_LENGTH(SD_DMA_BASE, 800*600);
IOWR_ALTERA_AVALON_DMA_CONTROL(SD_DMA_BASE, 0x02DC);
******
I need to do this cycle about for 25-30 times per second, but really it works only for 5-10 times per second.
How I can speedup this block?
Maybe someone had the same problem before or has any idea?
Thanks.
