i have a problem about pio

hi oceanx

thank you for your help.

yes, you are right,i am from P.R.C. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif

i have read the releated parts of the handbook,and i have try to use it as follows,

# include "excalibur.h"

# include "stdio.h"

# define clk 57600 //73140# define v 7# define outrate 6840

unsigned int Gcd(unsigned int M,unsigned int N)

{

unsigned int Rem;

while(N > 0)

{

Rem = M % N;

M = N;

N = Rem;

}

return M;

}

void main(void)

{

unsigned int wnfenzi,wnfenmu,gcd;

unsigned int rnfenzi,rnfenmu,rnzheng;

unsigned int fenzi,fenmu,faqam,qamfenzi,qamfenmu;

unsigned int inqam;

unsigned int bo,co;

//&#35745;&#31639;&#20889;&#26102;&#38047;&#21442;&#25968;

wnfenzi=outrate*v*188;

wnfenmu=clk*204*8;

gcd=Gcd(wnfenzi,wnfenmu);

wnfenzi=wnfenzi/gcd;

wnfenmu=wnfenmu/gcd;

printf("wnfenzi=%d,wnfenmu=%d\n",wnfenzi,wnfenmu);

na_wnfenzi_pio->np_piodirection=0xffffffff;

na_wnfenmu_pio->np_piodirection=0xffffffff;

na_wnfenzi_pio->np_piodata=wnfenzi;

na_wnfenmu_pio->np_piodata=wnfenmu;

//&#35745;&#31639;&#35835;&#20351;&#33021;&#21442;&#25968;

rnfenzi=wnfenmu*47;

rnfenmu=wnfenzi*2;

if(rnfenzi>rnfenmu)

{

rnzheng=rnfenzi/rnfenmu;

rnfenzi=rnfenzi-rnfenmu*rnzheng;

if(rnfenzi==0)

{

rnfenmu=2;

}

rnfenmu=rnfenmu-1;

rnfenzi=rnzheng+rnfenzi;

}

//&#36755;&#20986;&#20026;rnfenmu(factor),rnzheng(conl_1),rnfenzi(conl_2)

printf("rnfenzi=%d,rnzheng=%d,rnfenmu=%d\n",rnfenzi,rnzheng,rnfenmu);

na_rnfenmu_pio->np_piodirection=0xffffffff;

na_rnzheng_pio->np_piodirection=0xffffffff;

na_rnfenzi_pio->np_piodirection=0xffffffff;

na_rnfenmu_pio->np_piodata=rnfenmu;

na_rnzheng_pio->np_piodata=rnzheng;

na_rnfenzi_pio->np_piodata=rnfenzi;

//&#35745;&#31639;&#36870;&#36895;&#29575;&#21305;&#37197;

faqam=outrate%1000;

inqam=outrate/1000;

if(faqam==0)

{

fenzi=outrate;

fenmu=clk;

}

gcd=Gcd(faqam,1000);

qamfenzi=faqam/gcd;

qamfenmu=1000/gcd;

fenzi=inqam*qamfenmu+qamfenzi;

fenmu=clk*qamfenmu;

printf("fenzi=%d,fenmu=%d\n",fenzi,fenmu);

na_fenzi_pio->np_piodirection=0xffffffff;

na_fenmu_pio->np_piodirection=0xffffffff;

na_fenzi_pio->np_piodata=10;

co=na_fenzi_pio->np_piodata;

na_fenmu_pio->np_piodata=fenmu;

bo=na_fenmu_pio->np_piodata;

}

but when i use modelsim to check the result ,i do not understand the waves.

i mean when the data are written to the pio&#39;s data register,will the pio&#39;s output be always the data? what should i do if i want to output them at a time ,after all the numbers be computed out?