ST X-CUBE-MEMS1 - 2.2.4 Demo code; 2.2.5 Algorithm performance

2.2.4 Demo code
The following demonstration code reads data from the accelerometer, temperature and pressure sensors and
detects the airplane mode code.
[…]
#define VERSION_STR_LENG 35
#define ALGO_FREQ 100
[…]
/*** Initialization ***/
char lib_version[VERSION_STR_LENG];
/* Airplane Detection API initialization function */
MotionAD_Initialize(ALGO_FREQ);
/* Optional: Get version */
MotionAD_GetLibVersion(lib_version);
[…]
/*** Using Airplane Detection algorithm ***/
Timer_OR_DataRate_Interrupt_Handler()
{
MAD_input_t data_in;
MAD_output_t data_out;
/* Get acceleration X/Y/Z in g */
MEMS_Read_AccValue(&data_in.Acc[0], &data_in.Acc[1], &data_in.Acc[2]);
/* Get presure in Pa */
MEMS_Read_PressValue(&data_in.Press);
/* Get temperature in °C */
MEMS_Read_TempValue(&data_in.Temp);
/* Airplane Detection algorithm update */
MotionAD_Update(&data_in, &data_out);
}
2.2.5 Algorithm performance
Table 2. Cortex-M4 and Cortex-M3: elapsed time (µs) algorithm
Cortex-M4 STM32F401RE at 84 MHz
Cortex-M3 STM32L152RE at 32 MHz
Min Avg Max Min Avg Max
4 24 95 36 110 371
UM2722
MotionAD middleware library for X-CUBE-MEMS1 software expansion for STM32Cube
UM2722 - Rev 2
page 6/15