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HMC6352

 
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joseph
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HMC6352
PostPosted: Mon Feb 09, 2009 11:39 am     Reply with quote
Hello i'm trying to play with a 2axis compas ( HMC6352 + pi 16f877) but it's doesn't work...... I've read every post, forum but i don't understand...

My code :
Code:


#include  <16f877.H>
#fuses XT,NOPROTECT,NOWDT,NOBROWNOUT
#use delay(clock=4000000)

#use i2c(master,sda=PIN_C4,scl=PIN_C3,FORCE_HW)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,errors)

#define HMC6352_I2C_WRITE_ADDRESS 0x42
#define HMC6352_I2C_READ_ADDRESS  0x43
#define HMC6352_GET_DATA_COMMAND 0x41

long heading;
long HMC6352_read_heading(void);


void main()
{
      int16 heading;
      heading=0;
      while(1)
        {
        heading = HMC6352_read_heading();
         printf("Heading in degrees = %lu\n\r",heading/10);
        delay_ms(2000);
        }
}
//---------------------------------------------
int16 HMC6352_read_heading(void)
{
   int8 lsb=0; int8 msb=0;
   i2c_start();
   i2c_write(HMC6352_I2C_WRITE_ADDRESS);
   i2c_write(HMC6352_GET_DATA_COMMAND);       i2c_stop();

      delay_ms(10);  // Allow 1 ms extra for safety

      i2c_start();
      i2c_write(HMC6352_I2C_READ_ADDRESS);
      msb = i2c_read();
      lsb = i2c_read();
      i2c_stop();

      heading = msb*255 + lsb/10;
      heading = ((int16)lsb | ((int16)msb << 8));
}


It's seems, that the compas do not understand, on windows hyper terminal i have :

Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
Heading in degrees = 2
.....
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 09, 2009 12:15 pm     Reply with quote
You are looking at some preliminary code that was an experiment.
Please use the final driver. It's posted in the code library:
http://www.ccsinfo.com/forum/viewtopic.php?t=35914
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