Nios instability

thanks for your response dsl, unfortunately that doesn't help me

I try to get the time for "every" functions in this way :

while(1)

{

alt_timestamp_start();

int t1 = alt_timestamp();

IOWR_ALTERA_AVALON_PIO_DATA(SIGNAL, 0x00);

int t2 = alt_timestamp();

IOWR_ALTERA_AVALON_PIO_DATA(SIGNAL, 0x01);

int t3 = alt_timestamp();

printf("%u %u\n%u %u\n\n", t1, t2, t3, t4);

t4 = alt_timestamp();

}

and here is what the consoles displays me :

1164 3399

5294 67155888

1129 3074

5014 317099

1124 3054

4944 440449

1129 3119

5034 440119

1144 3074

4994 443629

so it proves me that" IOWR_ALTERA_AVALON_PIO_DATA(..., ...)" never takes the same amount of time

someone know if it is possible to fix a constant time for this function or in general for a function ?

thanks in advance