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.cpp
- Revision:
- 2:66db0f91b215
- Parent:
- 1:ef026bf28798
- Child:
- 3:ffb0b1650ca2
diff -r ef026bf28798 -r 66db0f91b215 MMA8452.cpp --- a/MMA8452.cpp Tue Oct 08 15:25:32 2013 +0000 +++ b/MMA8452.cpp Tue Oct 08 16:13:14 2013 +0000 @@ -74,7 +74,7 @@ // Get device ID -int Accelerometer_MMA8452::Get_DeviceID(int *deviceID) +int Accelerometer_MMA8452::get_DeviceID(int& deviceID) { char mcu_address = (MMA8452_ADDRESS<<1); int z = 0; @@ -102,7 +102,7 @@ return 1; } wait( 0.1); - //deviceID = m_i2c.read(0); + deviceID = m_i2c.read(0); z = m_i2c.read(0); wait( 0.1); m_i2c.stop();