Hi,
I have a similar problem with my Beaglebone and Starterware. To check out
the performance of Starterware and Beaglebone I do the following in my
main-Function:
while(1)
{
GPIOPinWrite(GPIO_INSTANCE_ADDRESS,28, GPIO_PIN_HIGH);
* for*(i=0; i<35000; i++)
{
x = *sqrt*(3.141592654);
}
* GPIOPinWrite*(GPIO_INSTANCE_ADDRESS, 28, GPIO_PIN_LOW);
* for*(i=0; i<35000; i++)
{
x = *sqrt*(3.141592654);
}
}
As you can see I toggle a pin and in between I do sqrt(pi) 35000 times.
Using an oscilloscope I measure the period /frequency on that pin.
At first I got: T = 18 s !!!!
Then I found this post and enabled Cache and MMU like in the example:
\\StarterWare\examples\evmskAM335x\uart_edma\uartEcho_edma.c
After that i measured: T = 500 ms / f = 2 Hz
This is still quite slow! I run a program with the same functionality using
the Linux Distribution Angström on the beaglebone, there I measured a
period of T = 1.1 ms / f = 1 kHz .
So what is going on with the Starterware being so slow? Do I have to enable
the Cache / MMU differently or can't I go faster with Starterware??? I read
a few posts so far where people wrote that they solved this speed problem
by enabling the cache and mmu but it still is fu***** slow : ) why ??? help
me please ;)
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