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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1993 | - | 1 | /*HMC5883LRegisterScanner.pde |
| 2 | **A sketch that attempts to read every register from a slave device |
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| 3 | **Written by Wayne Truchsess http://dsscircuits.com |
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| 4 | */ |
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| 5 | |||
| 6 | #include "Wire.h" |
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| 7 | #define I2C 0x1E |
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| 8 | |||
| 9 | byte x; |
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| 10 | |||
| 11 | void setup() { |
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| 12 | Wire.begin(); |
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| 13 | Serial.begin(9600); |
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| 14 | delay(1000); |
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| 15 | |||
| 16 | Wire.beginTransmission(I2C); // start transmission to device |
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| 17 | Wire.send(0); // send register address |
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| 18 | Wire.send(0x70); // send value to write |
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| 19 | Wire.endTransmission(); // end transmission |
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| 20 | delay(10); |
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| 21 | Wire.beginTransmission(I2C); // start transmission to device |
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| 22 | Wire.send(1); // send register address |
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| 23 | Wire.send(B11000000); // send value to write |
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| 24 | Wire.endTransmission(); // end transmission |
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| 25 | delay(10); |
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| 26 | Wire.beginTransmission(I2C); // start transmission to device |
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| 27 | Wire.send(2); // send register address |
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| 28 | Wire.send(0x00); // send value to write |
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| 29 | Wire.endTransmission(); // end transmission |
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| 30 | |||
| 31 | delay(100); |
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| 32 | baselineRegisters(); |
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| 33 | } |
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| 34 | |||
| 35 | void loop() { |
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| 36 | int x,y,z; |
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| 37 | Wire.beginTransmission(I2C); |
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| 38 | Wire.send(3); // will start from DATA X MSB and fetch all the others |
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| 39 | Wire.endTransmission(); |
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| 40 | |||
| 41 | Wire.beginTransmission(I2C); |
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| 42 | Wire.requestFrom(I2C, 6); |
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| 43 | if(6 == Wire.available()) { |
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| 44 | // read out the 3 values, 2 bytes each. |
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| 45 | x = (Wire.receive() << 8) + Wire.receive(); |
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| 46 | y = (Wire.receive() << 8) + Wire.receive(); |
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| 47 | z = (Wire.receive() << 8) + Wire.receive(); |
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| 48 | // the HMC5843 will automatically wrap around on the next request |
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| 49 | } |
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| 50 | Wire.endTransmission(); |
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| 51 | |||
| 52 | Serial.print(x); |
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| 53 | Serial.print(" "); |
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| 54 | Serial.print(y); |
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| 55 | Serial.print(" "); |
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| 56 | Serial.println(z); |
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| 57 | |||
| 58 | delay(100); |
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| 59 | return; |
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| 60 | } |
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| 61 | |||
| 62 | void baselineRegisters() { |
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| 63 | for(int l = 0x00; l < 0x12; l++){ |
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| 64 | Wire.beginTransmission(I2C); |
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| 65 | Wire.send(l); |
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| 66 | Wire.endTransmission(); |
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| 67 | //delay(100); |
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| 68 | Wire.beginTransmission(I2C); |
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| 69 | Wire.requestFrom(I2C,1); |
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| 70 | x = Wire.receive(); |
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| 71 | Serial.print("Register Address "); |
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| 72 | Serial.print(l,DEC); |
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| 73 | Serial.print(" = "); |
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| 74 | Serial.print(x,BIN); |
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| 75 | Serial.print(" = "); |
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| 76 | Serial.print(x,DEC); |
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| 77 | Serial.println(" "); |
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| 78 | Wire.endTransmission(); |
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| 79 | } |
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| 80 | } |