Library Description

The library covers all the necessary functions to control the PAC1954 click board.

Key functions:

• void pac1954_single_write( uint8_t reg_addr, uint8_t data_in ) - This function writes a single data byte to the selected register.
• void pac1954_refresh_cmd( void ) -
  The readable registers for the VBUS, VSENSE, Power, accumulator outputs and accumulator count are updated by the 
  REFRESH command and the values will be static until the next REFRESH command.
• float pac1954_get_calc_measurement( uint8_t meas_sel, uint8_t ch_sel, uint8_t avg_sel, uint8_t meas_mode ) -
  This function will call function for getting the selected measurement data and will perform all necessary calculations to get measurement value in a standard unit.

Examples description

The application is composed of three sections :

• System Initialization - Performs the configuration for all necessary pins and
    peripherals.
• Application Initialization - Performs the driver initialization and executes
    a default configuration of the PAC1954 click board.
• Application Task - (code snippet) First calls a REFRESH command to allow all measurement and config registers to be updated. After that reads the calculated
    measurement results of channel 1 and sends the results to the usb uart port
    every 1 second.

void application_task ( )
{
    pac1954_refresh_cmd( );

    vsource = pac1954_get_calc_measurement( PAC1954_MEAS_SEL_V_SOURCE, 
                                            PAC1954_CH_SEL_CH_1, 
                                            PAC1954_AVG_SEL_ENABLE, 
                                            PAC1954_MEAS_MODE_BIPOLAR_FSR );
    isense = pac1954_get_calc_measurement( PAC1954_MEAS_SEL_I_SENSE, 
                                           PAC1954_CH_SEL_CH_1, 
                                           PAC1954_AVG_SEL_ENABLE, 
                                           PAC1954_MEAS_MODE_BIPOLAR_FSR );
    power = pac1954_get_calc_measurement( PAC1954_MEAS_SEL_P_SENSE, 
                                          PAC1954_CH_SEL_CH_1, 
                                          PAC1954_NULL, 
                                          PAC1954_MEAS_MODE_BIPOLAR_FSR );
    
    FloatToStr( vsource, log_txt );
    Ltrim( log_txt );
    float_cut( );
    mikrobus_logWrite( "V(source) is ", _LOG_TEXT );
    mikrobus_logWrite( log_txt, _LOG_TEXT );
    mikrobus_logWrite( " V", _LOG_LINE );

    FloatToStr( isense, log_txt );
    Ltrim( log_txt );
    float_cut( );
    mikrobus_logWrite( "I(sense) is ", _LOG_TEXT );
    mikrobus_logWrite( log_txt, _LOG_TEXT );
    mikrobus_logWrite( " A", _LOG_LINE );

    FloatToStr( power, log_txt );
    Ltrim( log_txt );
    float_cut( );
    mikrobus_logWrite( "P(sense) is ", _LOG_TEXT );
    mikrobus_logWrite( log_txt, _LOG_TEXT );
    mikrobus_logWrite( " W", _LOG_LINE );
    mikrobus_logWrite( "", _LOG_LINE );

    Delay_ms( 1000 );
}

Other mikroE Libraries used in the example:

• I2C
• UART

Additional notes and informations

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.