I2C driver for HMC5583L digital compass sensor
hmc5583l.cpp@0:91f08ac76444, 2015-12-03 (annotated)
- Committer:
- sillevl
- Date:
- Thu Dec 03 07:52:58 2015 +0000
- Revision:
- 0:91f08ac76444
- Child:
- 1:097089f0feb1
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sillevl | 0:91f08ac76444 | 1 | #include "hmc5583l.h" |
sillevl | 0:91f08ac76444 | 2 | #include "stdint.h" |
sillevl | 0:91f08ac76444 | 3 | |
sillevl | 0:91f08ac76444 | 4 | HMC5583L::HMC5583L(PinName sda, PinName scl, int _address): i2c(sda, scl), address(_address) |
sillevl | 0:91f08ac76444 | 5 | { |
sillevl | 0:91f08ac76444 | 6 | char data[2]; |
sillevl | 0:91f08ac76444 | 7 | data[0] = 0x02; // select mode register |
sillevl | 0:91f08ac76444 | 8 | data[1] = 0x00; // continous measurement mode |
sillevl | 0:91f08ac76444 | 9 | |
sillevl | 0:91f08ac76444 | 10 | i2c.write(address, data, 2); |
sillevl | 0:91f08ac76444 | 11 | } |
sillevl | 0:91f08ac76444 | 12 | |
sillevl | 0:91f08ac76444 | 13 | coord HMC5583L::getCompass() |
sillevl | 0:91f08ac76444 | 14 | { |
sillevl | 0:91f08ac76444 | 15 | coord c; |
sillevl | 0:91f08ac76444 | 16 | // tell where to begin reading data |
sillevl | 0:91f08ac76444 | 17 | char data[] = {0x03}; // select register 3, MSB register |
sillevl | 0:91f08ac76444 | 18 | i2c.write(address, data, 1); |
sillevl | 0:91f08ac76444 | 19 | |
sillevl | 0:91f08ac76444 | 20 | char values[6]; |
sillevl | 0:91f08ac76444 | 21 | i2c.read(address, values, 6); |
sillevl | 0:91f08ac76444 | 22 | |
sillevl | 0:91f08ac76444 | 23 | // x = (x >> 11) == 0 ? x : -1 ^ 0xFFF | x; |
sillevl | 0:91f08ac76444 | 24 | c.x = regToInt(values[0], values[1]); |
sillevl | 0:91f08ac76444 | 25 | c.y = regToInt(values[2], values[3]); |
sillevl | 0:91f08ac76444 | 26 | c.z = regToInt(values[4], values[5]); |
sillevl | 0:91f08ac76444 | 27 | |
sillevl | 0:91f08ac76444 | 28 | return c; |
sillevl | 0:91f08ac76444 | 29 | } |
sillevl | 0:91f08ac76444 | 30 | |
sillevl | 0:91f08ac76444 | 31 | int HMC5583L::regToInt(char msb, char lsb){ |
sillevl | 0:91f08ac76444 | 32 | int16_t value = msb << 8 | lsb; |
sillevl | 0:91f08ac76444 | 33 | return (int) value; |
sillevl | 0:91f08ac76444 | 34 | } |