vumeter  2.0.0.0
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VU Meter click

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Click library

  • Author : Stefan Filipovic
  • Date : Sep 2021.
  • Type : SPI type

Software Support

We provide a library for the VUMeter Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for VUMeter Click driver.

Standard key functions :

Example key functions :

  • vumeter_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.
    err_t vumeter_read_an_pin_voltage ( vumeter_t *ctx, float *data_out );
  • vumeter_set_gain_level This function sets the input signal gain level (the microphone sensitivity).
    err_t vumeter_set_gain_level ( vumeter_t *ctx, uint8_t gain_lvl );
  • vumeter_calculate_vu_level This function calculates VU level from the analog voltage input.
    float vumeter_calculate_vu_level ( vumeter_t *ctx, uint16_t sample_rate_ms );

Example Description

This example demonstrates the use of VU Meter click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and sets the gain level (the microphone sensitivity) to maximum.

void application_init ( void )
{
log_cfg_t log_cfg;
vumeter_cfg_t vumeter_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
vumeter_cfg_setup( &vumeter_cfg );
VUMETER_MAP_MIKROBUS( vumeter_cfg, MIKROBUS_1 );
err_t init_flag = vumeter_init( &vumeter, &vumeter_cfg );
if ( SPI_MASTER_ERROR == init_flag )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

Calculates VU level from the analog voltage read from AN pin, and displays the results on the USB UART approximately every 100ms.

void application_task ( void )
{
log_printf( &logger, " VU level: %.3f VU\r\n", vumeter_calculate_vu_level ( &vumeter, 100 ) );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.VUMeter

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.


vumeter_cfg_setup
void vumeter_cfg_setup(vumeter_cfg_t *cfg)
VU Meter configuration object setup function.
vumeter_init
err_t vumeter_init(vumeter_t *ctx, vumeter_cfg_t *cfg)
VU Meter initialization function.
vumeter_t
VU Meter Click context object.
Definition: vumeter.h:118
application_task
void application_task(void)
Definition: main.c:63
VUMETER_GAIN_LEVEL_MAX
#define VUMETER_GAIN_LEVEL_MAX
VU Meter gain level values.
Definition: vumeter.h:61
VUMETER_MAP_MIKROBUS
#define VUMETER_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: vumeter.h:103
vumeter_calculate_vu_level
float vumeter_calculate_vu_level(vumeter_t *ctx, uint16_t sample_rate_ms)
VU Meter calculate VU level function.
application_init
void application_init(void)
Definition: main.c:28
vumeter_read_an_pin_voltage
err_t vumeter_read_an_pin_voltage(vumeter_t *ctx, float *data_out)
VU Meter read AN pin voltage level function.
vumeter_cfg_t
VU Meter Click configuration object.
Definition: vumeter.h:132
vumeter_set_gain_level
err_t vumeter_set_gain_level(vumeter_t *ctx, uint8_t gain_lvl)
VU Meter set gain level function.