Library for driving the MMA8452 accelerometer over I2C
Dependents: MMA8452_Test MMA8452_Demo Dualing_Tanks IMU-Controlled_MP3_Player ... more
Here is a simple example:
#include "mbed.h" #include "MMA8452.h" int main() { Serial pc(USBTX,USBRX); pc.baud(115200); double x = 0, y = 0, z = 0; MMA8452 acc(p28, p27, 40000); acc.setBitDepth(MMA8452::BIT_DEPTH_12); acc.setDynamicRange(MMA8452::DYNAMIC_RANGE_4G); acc.setDataRate(MMA8452::RATE_100); while(1) { if(!acc.isXYZReady()) { wait(0.01); continue; } acc.readXYZGravity(&x,&y,&z); pc.printf("Gravities: %lf %lf %lf\r\n",x,y,z); } }
An easy way to test that this actually works is to run the loop above and hold the MMA8452 parallel to the ground along the respective axis (and upsidedown in each axis). You will see 1G on the respective axis and 0G on the others.
Diff: MMA8452.h
- Revision:
- 17:6e4232c421c0
- Parent:
- 16:d6dde2318edc
- Child:
- 18:27d839e6dc0e
--- a/MMA8452.h Wed Mar 05 16:47:13 2014 +0000 +++ b/MMA8452.h Wed Mar 05 17:01:00 2014 +0000 @@ -21,10 +21,6 @@ // the SparkFun breakout board defaults to 1, set to 0 if SA0 jumper on the bottom of the board is set // see the Table 10. I2C Device Address Sequence in Freescale MMA8452Q pdf - - -#define DBG(...) pc.printf(__VA_ARGS__); pc.printf("\r\n"); -#define DBGX(...) pc.print(__VA_ARGS__); #include "mbed.h" @@ -238,7 +234,9 @@ DataRateHz getDataRate(); BitDepth getBitDepth(); + #ifdef MMA8452_DEBUG void debugRegister(char reg); + #endif private: int readRaw(char src, char *dst, int len);