propellor c and compass sensor

Patrick222122

It me again. This time I am having trouble setting up the code for a Parallax Compass Module 3-Axis HMC5883L in c. The trouble is not with the premade library functions for it but rather I cannot seem to create the i2c connection the sensor needs. I have tried multiple time using the code in both the simple tools and I2c libraries to no success. How do I open I2c bus? Please code example's if possible.

jazzed

Patrick222122 wrote: »

It me again. This time I am having trouble setting up the code for a Parallax Compass Module 3-Axis HMC5883L in c. The trouble is not with the premade library functions for it but rather I cannot seem to create the i2c connection the sensor needs. I have tried multiple time using the code in both the simple tools and I2c libraries to no success. How do I open I2c bus? Please code example's if possible.

So, you've tried this code with the compass connected to P2/P3 and it doesn't work ?

/*
  Test Compass HMC5883L.c
  
  Test compass with SCL connected to P3 and SDA connected to P2. Display
  measurement results in SimpleIDE Terminal.
  
 learn.parallax.com/propeller-c-simple-devices/sense-direction-compass-hmc5883l
*/


#include "simpletools.h"                      // Include simpletools header
#include "compass3d.h"                        // Include compass3d header


int main()                                    // Main function
{
  int x, y, z;                                // Declare x, y, & z axis variables
  
  i2c *bus = i2c_newbus(3, 2, 0);             // New I2C bus SCL=P3, SDA=P2
  compass_init(bus);                          // Initialize compass on bus.


  while(1)                                    // Repeat indefinitely
  {
    compass_read(bus, &x, &y, &z);            // Compass vals -> variables
    print("%cx=%d, y=%d, z=%d%c\n",           // Display compass variables
           HOME, x, y, z, CLREOL);


    float fy = (float) y;                     // Ints to floats
    float fx = (float) x;
    float heading = atan2(fy, fx) * 180.0/PI; // Calculate heading with floats
    if(heading < 0.0)                         // Convert -180...+180 to 0...360
      heading = (360.0 + heading);
    print("heading = %.2f%c\n",               // Display heading
                        heading, CLREOL);       


    pause(500);                               // Wait 1/2 second
  }
}

From the Learn/Simple Library repository.

Patrick222122

Thanks that fixed the problem