Hello guys .
i am trying to make a triangular wave with the ad9833 and the rabbit 4000.
i am trying to make a triangular wave from 5 Khz till 2 Mhz . but it doesnt work.
what can be the reason that it doesnt work?
here is my code :
void SendInt(int x)
{
char bhigh,blow;
char value[2];
bhigh=(char)((x>>8)&0xff);
blow=(char)(x&0xff);
value[0]=bhigh;
value[1]=blow;
SPIWrite(&value[0],2);
}
void CreateWord(long num, unsigned int *highbyte, unsigned int *lowbyte)
{
(*highbyte)=num&0x3fff;
(*highbyte)|=0x4000;
num=num>>14;
(*lowbyte)=num&0x3fff;
(*lowbyte)|=0x4000;
}
void StartWaveGenerator(void)
{
unsigned int mbuf[3];
int i;
mbuf[0]=0x2002; // 2002 for triangle
CreateWord(SetFreq(7000) ,&mbuf[1],&mbuf[2]);
SendInt(mbuf[0]);
SendInt(mbuf[1]);
SendInt(mbuf[2]);
}
#define MCLK 20000000
#define REGSIZE 268435456 // 2^28
long SetFreq(long freqval)
{
long fregister;
fregister=freqval*(REGSIZE*1./MCLK);
return fregister;
}
void main()
{
StartWaveGenerator();
}