Library Description

The library initializes and defines the I2C or SPI bus driver and drivers that offer a choice for writing data in the register and reads data from register. The library includes the function for reading Accel X/Y/Z axis data, the function for reading pedometer stem counter, the function for detect Tilt and Tap. The user also has the functions for configuration device functions for reads interrupt states.

Key functions:

• void pedometer3_getAccelAxis(int16_t *x_axis, int16_t *y_axis, int16_t *z_axis) - Functions for reading Accel axis data

• uint16_t pedometer3_getPedometerStepCounter() - Functions for getting pedometer step counter

• void pedometer3_getTiltPosition(uint8_t *current_pos, uint8_t *previous_pos) - Functions for getting Tilt current and previous position

• void pedometer3_getTapDetection(uint8_t *tap) - Functions for getting Tap detection

Examples description

The application is composed of the three sections :

• System Initialization - Initializes I2C module and sets INT pin, AN pin and RST pin as INPUT and CS pin as OUTPUT
• Application Initialization - Initialization driver init and start configuration chip for measurement
• Application Task - (code snippet) - Reads Accel and High Pass Accel X/Y/Z axis and detect Tilt Position. All data logs on the USB UART every 500 ms.

Note: The start configuration chip is required at the beginning of each program so that the chip wakes up and prepares for operation and measurement. What is included and set in the start-up function can be viewed in the help file.

void applicationTask()
{
    pedometer3_getAccelAxis( &X_accelAxis, &Y_accelAxis, &Z_accelAxis );
    pedometer3_getHighPassAccelAxis( &X_hpAxis, &Y_hpAxis, &Z_hpAxis );
    pedStep += pedometer3_getPedometerStepCounter();
    
    mikrobus_logWrite("|___________ Pedometer 3 click _____________|", _LOG_LINE );
    mikrobus_logWrite("|  Data    |  X axis  |  Y axis  |  Z axis  |", _LOG_LINE );
    mikrobus_logWrite("|  Accel   |", _LOG_TEXT );
    IntToStr(X_accelAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_TEXT);
    IntToStr(Y_accelAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_TEXT);
    IntToStr(Z_accelAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_LINE);
    mikrobus_logWrite("| HP Accel |", _LOG_TEXT );
    IntToStr(X_hpAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_TEXT);
    IntToStr(Y_hpAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_TEXT);
    IntToStr(Z_hpAxis, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("    |", _LOG_LINE);
    mikrobus_logWrite("|___________________________________________|", _LOG_LINE );
    mikrobus_logWrite("| Pedometer step counter :", _LOG_TEXT );
    IntToStr(pedStep, demoText);
    mikrobus_logWrite(demoText, _LOG_TEXT);
    mikrobus_logWrite("            |", _LOG_LINE);
    mikrobus_logWrite("|___________________________________________|", _LOG_LINE );
    
    pedometer3_getTiltPosition(&CurrentTiltPosition, &PreviousTiltPosition);
    mikrobus_logWrite("| Current Tilt Position  :", _LOG_TEXT );
    switch(CurrentTiltPosition)
    {
        case 1:
        {
            mikrobus_logWrite("- LEFT            |", _LOG_LINE );
            break;
        }
        case 2:
        {
            mikrobus_logWrite("- RIGHT           |", _LOG_LINE );
            break;
        }
        case 3:
        {
            mikrobus_logWrite("- DOWN            |", _LOG_LINE );
            break;
        }
        case 4:
        {
            mikrobus_logWrite("- UP              |", _LOG_LINE );
            break;
        }
        case 5:
        {
            mikrobus_logWrite("- FACE DOWN       |", _LOG_LINE );
            break;
        }
        case 6:
        {
            mikrobus_logWrite("- FACE UP         |", _LOG_LINE );
            break;
        }
    }
    mikrobus_logWrite("|___________________________________________|", _LOG_LINE );
    
    mikrobus_logWrite("  ", _LOG_LINE);
    Delay_ms( 400 );
}

Other mikroE Libraries used in the example:

• I2C

Additional notes and information

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.