thoma...@gmx.de
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 ;)
Cody Lacey
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