ahm,nope,but we are using the same specs of electronic compass ..



here is the link

http://www.e-gizmo.com/KIT/images/Co...%20Compass.pdf

 

sir rob,
.at least i can base my code with yours.please share your knowledge my mentor.
thanks!

 

Skidd10,
Sorry for the delay. Here is some code (not very good) that I use to get the compass heading from the byte stream


unsigned char cReceived=0;

// Then, whilst in the main loop, poll for uart receive
if(U1STAT0 & 0x80) // There is receive data available
{
cCompassByte = U1RXD;// Get received byte
CompassReceive(cCompassByte); // Do something with character received
}

// Here, I want to
//================================================== =====
void CompassReceive(unsigned char ch)
//================================================== =====
{
// Look for $ - frame started
if(ch==0x24)
{
cReceived = 1;
c1=ch;
cReceived++;
return;
}

if(ch)
{
if(cReceived==2)
c2 = ch;
else if(cReceived==3)
c3 = ch;
else if(cReceived==4) // This will be hundreds
cHeading[0] = ch;
else if(cReceived==5) // This will be tens
cHeading[1] = ch;
else if(cReceived==6) // This will be the units
{
cHeading[2] = ch;
nHeading = atoi(&cHeading[0]); //convert to integer
}
else if(cReceived==7)
c7 = ch;
else if(cReceived==8)
c8 = ch;
else if(cReceived==9)
c9 = ch;
else if(cReceived==10)
c10 = ch;
else if(cReceived==11)
{
c11 = ch;
cReceived = 0;
return;
}
else {}

cReceived++;
}
}

 

ahm,sir rob,
i think u havent included the initiallization?can you share sir the whole code.
thanks for the sample code!

 

sir rob,how do you connect the compass to uart0 to uart1?

 

if(ch) ======>>>>>sir rob,what is our condition here?
{
if(cReceived==2)
c2 = ch;
else if(cReceived==3)
c3 = ch;
else if(cReceived==4) // This will be hundreds
cHeading[0] = ch;
else if(cReceived==5) // This will be tens
cHeading[1] = ch;
else if(cReceived==6) // This will be the units

 

skidd10,
You will have to look up your mcu manual for setting up/initiallising uart with whatever baud rate etc that your compass module has. Other than that, simple wire the compass tx/rx pins to the mcu tx/rx pins, but not necessarily in that order.

if(ch) tests if ch != 0x00 (I put this in since the uart initially sends a 0x00 on startup)

You will be able to make the code much better than this - I was just trying to spell things out.
Cheers,
Rob