Explore your favorite melodies with Si4731 and STM32F407VGT6

From AM's soulful beats to FM's vibrant tunes

Published Dec 29, 2023

Click board™

AM/FM Click

Dev Board

Clicker 4 for STM32F4

Compiler

NECTO Studio

MCU

STM32F407VGT6

Immerse yourself in a symphony of sound as our radio receiver opens up the airwaves, bringing the rich tapestry of AM and FM music directly to your ears

Hardware Overview

How does it work?

AM/FM Click is based on the Si4731, a digital CMOS AM/FM radio receiver IC that integrates the complete broadcast tuner and receiver function from antenna input to digital audio output from Silicon Labs. The audio signal from the output of the Si4731 is brought to a mini 3.5 female jack on board over the LM4910 - an output capacitor-less stereo 35mW headphone amplifier from Texas Instruments. That way, it is ensured that the user can plug in the headphones directly into the Click board™ without the need for any external amplifier. The Si4731 IC The device leverages the Silicon Labs broadcast-proven digital low-IF architecture, enabling a cost-effective digital audio platform for consumer electronic applications with high TDMA noise immunity, superior radio performance, and high fidelity audio power amplification. The audio signal is processed to

have the optimal dynamic qualities. The integrated DSP also handles the signal's stereo MPX encoding and FM modulation. The low-level digital intermediate frequency (IF) signal is filtered out and sent to the outputs, amplified, filtered, and digitized with high-resolution analog-to-digital converters (ADCs). This advanced architecture allows the Si4731- to perform channel selection, FM demodulation, and stereo audio processing to achieve superior performance compared to traditional analog architectures. The Click is designed for communication over the I2C/2-wire control interface. When selecting 2-wire mode, the SCLK pin should stay at a HIGH logic level during the rising edge on the RST pin and stay HIGH until after the first start condition. Also, a start condition must not occur within 300nS before the rising edge on the RST pin. The 2-wire

bus mode uses only the SCL and SDA pins for communication. The Si4731 IC has the capability of the received signal measurement. The antenna used to broadcast the signal can also be used to accept the incoming signal sent by the receiving device. Although it can be used both to receive and transmit signals, the antenna can't operate in both modes simultaneously. This feature can be useful when calibrating the transmission power of the click board. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Features overview

Development board

Clicker 4 for STM32F4 is a compact development board designed as a complete solution that you can use to quickly build your own gadgets with unique functionalities. Featuring an STM32F407VGT6 MCU, four mikroBUS™ sockets for Click boards™ connectivity, power management, and more, it represents a perfect solution for the rapid development of many different types of applications. At its core is an STM32F407VGT6 MCU, a powerful microcontroller by STMicroelectronics based on the high-performance

Arm® Cortex®-M4 32-bit processor core operating at up to 168 MHz frequency. It provides sufficient processing power for the most demanding tasks, allowing Clicker 4 to adapt to any specific application requirements. Besides two 1x20 pin headers, four improved mikroBUS™ sockets represent the most distinctive connectivity feature, allowing access to a huge base of Click boards™, growing on a daily basis. Each section of Clicker 4 is clearly marked, offering an intuitive and clean interface. This makes working with the

development board much simpler and, thus, faster. The usability of Clicker 4 doesn’t end with its ability to accelerate the prototyping and application development stages: it is designed as a complete solution that can be implemented directly into any project, with no additional hardware modifications required. Four mounting holes [4.2mm/0.165”] at all four corners allow simple installation by using mounting screws.

Microcontroller Overview

MCU Card / MCU

Architecture

ARM Cortex-M4

MCU Memory (KB)

Silicon Vendor

STMicroelectronics

Pin count

100

RAM (Bytes)

100

You complete me!

Accessories

These standard small stereo earphones offer a high-quality listening experience with their top-notch stereo cable and connector. Designed for universal compatibility, they effortlessly connect to all MIKROE mikromedia and multimedia boards, making them an ideal choice for your electronic projects. With a rated power of 100mW, the earphones provide crisp audio across a broad frequency range from 20Hz to 20kHz. They boast a sensitivity of 100 ± 5dB and an impedance of 32Ω ± 15%, ensuring optimal sound quality. The Φ15mm speaker delivers clear and immersive audio. Cost-effective and versatile, these earphones are perfect for testing your prototype devices, offering an affordable and reliable audio solution to complement your projects.

Used MCU Pins

mikroBUS™ mapper

General-Purpose Output 1

PC4

Reset

PC15

RST

I2C Address Selection

PA4

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

Shutdown

PE9

PWM

General-Purpose Output 2

PD0

INT

I2C Clock

PB10

SCL

I2C Data

PB11

SDA

Ground

GND

Take a closer look

Schematic

Step by step

Project assembly

Clicker 4 for STM32F4 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Clicker 4 for STM32F4 as your development board.

LTE IoT 5 Click front image hardware assembly

LTE IoT 5 Click complete accessories setup image hardware assembly

Clicker 4 STM32F4 Access MB 1 - upright/background hardware assembly

Clicker 4 for STM32F4 HA MCU Step hardware assembly

Necto No Display image step 8 hardware assembly

Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Software Support

Library Description

This library contains API for AM/FM Click driver.

Key functions:

amfm_tune_up - This function increments current frequency for 10 KHz
amfm_set_volume - This function sets volume level in range: 0 - 63
amfm_get_stc -This function checks STC bit state

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * \file 
 * \brief AmFm Click example
 * 
 * # Description
 * This app simulate RADIO RECEIVER.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initializes device.
 * 
 * ## Application Task  
 * Several additional functions are executed and printed over the terminal.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "amfm.h"

// ------------------------------------------------------------------ VARIABLES

static amfm_t amfm;
static log_t logger;

float aux;
uint8_t volume = 0x3F;
uint8_t mute_flag = 0;
uint8_t status;
uint16_t station_1 = 0;
uint16_t station_2 = 0;
uint16_t station_3 = 0;
uint16_t station_4 = 0;
uint16_t station_5 = 0;
uint16_t station_frequency = 0;
uint8_t memory = 0;

// ------------------------------------------------------- ADDITIONAL FUNCTIONS

void amfm_case_memorize ( )
{
    switch ( memory )
    {
        case 0 :
        {
            station_1 = station_frequency;
            memory += 1;
            log_printf( &logger, "> > > station 1 memorized\r\n" );
            break;
        }
        case 1 :
        {
            station_2 = station_frequency;
            memory += 1;
            log_printf( &logger, "> > > station 2 memorized\r\n" );
            break;
        }
        case 2 :
        {
            station_3 = station_frequency;
            memory += 1;
            log_printf( &logger, "> > > station 3 memorized\r\n" );
            break;
        }
        case 3 :
        {
            station_4 = station_frequency;
            memory += 1;
            log_printf( &logger, "> > > station 4 memorized\r\n" );
            break;
        }
        case 4 :
        {
            station_5 = station_frequency;
            memory = 0;
            log_printf( &logger, "> > > station 5 memorized\r\n" );
            break;
        }
        default :
        {
            break;
        }
    }
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_station_1 ( amfm_t *ctx )
{
    log_printf( &logger, "> > > tune station 1 \r\n" );
    amfm_tune_frequency( ctx, station_1 );
    log_printf( &logger, "> > > tune done \r\n" );
    aux = station_1 / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_station_2 ( amfm_t *ctx )
{
    log_printf( &logger, "> > > tune station 2 \r\n" );
    amfm_tune_frequency( ctx, station_2 );
    log_printf( &logger, "> > > tune done \r\n" );
    aux = station_2 / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_station_3 ( amfm_t *ctx )
{
    log_printf( &logger, "> > > tune station 3 \r\n" );
    amfm_tune_frequency( ctx, station_3 );
    log_printf( &logger, "> > > tune done \r\n" );
    aux = station_3 / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_station_4 ( amfm_t *ctx )
{
    log_printf( &logger, "> > > tune station 4 \r\n" );
    amfm_tune_frequency( ctx, station_4 );
    log_printf( &logger, "> > > tune done \r\n" );
    aux = station_4 / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_station_5 ( amfm_t *ctx )
{
    log_printf( &logger, "> > > tune station 5 \r\n" );
    amfm_tune_frequency( ctx, station_5 );
    log_printf( &logger, "> > > tune done \r\n" );
    aux = station_5 / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_seek ( amfm_t *ctx )
{
    log_printf( &logger, "> > > seek \r\n" );
    amfm_seek( ctx );
    log_printf( &logger, "> > > seek done \r\n" );
    station_frequency =  amfm_get_channel( ctx );
    aux = station_frequency / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_plus ( amfm_t *ctx )
{
    if ( volume < 63 )
    {
        volume += 1;
        amfm_set_volume( ctx, volume );
        log_printf( &logger, "> > > volume: %u \r\n", volume );
    }
    else
    {
        log_printf( &logger, "> > > volume: MAX \r\n" );
    }
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_minus ( amfm_t *ctx )
{
    if ( volume > 0 )
    {
        volume -= 1;
        amfm_set_volume( ctx, volume );
        log_printf( &logger, "> > > volume: %u \r\n", volume );
    }
    else
    {
        log_printf( &logger, "> > > volume: MIN \r\n" );
    }
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_mute ( amfm_t *ctx )
{
    if ( 0 == mute_flag )
    {
        amfm_mute( ctx );
        log_printf( &logger, "> > > mute ON \r\n" );
        mute_flag = 1;
    }
    else
    {
        amfm_unmute( ctx );
        log_printf( &logger, "> > > mute OFF \r\n" );
        mute_flag = 0;
    }
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_tune_up ( amfm_t *ctx )
{
    amfm_tune_up( ctx );
    station_frequency = amfm_get_channel( ctx );
    aux = station_frequency / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

void amfm_case_tune_down ( amfm_t *ctx )
{
    amfm_tune_down( ctx );
    station_frequency = amfm_get_channel( ctx );
    aux = station_frequency / 100.0;
    log_printf( &logger, "> > > frequency: %f MHz \r\n", aux );
    log_printf( &logger, "-----------------------------------------\r\n" );
}

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    amfm_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    amfm_cfg_setup( &cfg );
    AMFM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    amfm_init( &amfm, &cfg );

    Delay_ms ( 100 );
    status = amfm_init_device( &amfm );
    if ( 0 == status )
    {
        log_printf( &logger, "> > > app init done < < <\r\n" );
    }
    else if ( 1 == status )
    {
        log_printf( &logger, "> > >    timeout    < < <\r\n" );
    }
    Delay_ms ( 1000 );
    
    amfm_case_seek( &amfm );
    amfm_case_memorize( );
    Delay_ms ( 1000 );
    
    amfm_case_seek( &amfm );
    amfm_case_memorize( );
    Delay_ms ( 1000 );
    
    amfm_case_seek( &amfm );
    amfm_case_memorize( );
    Delay_ms ( 1000 );
    
    amfm_case_seek( &amfm );
    amfm_case_memorize( );
    Delay_ms ( 1000 );
    
    amfm_case_seek( &amfm );
    amfm_case_memorize( );
    Delay_ms ( 1000 );
    
    amfm_case_plus( &amfm );
    Delay_ms ( 1000 );
}

void application_task ( void )
{
    amfm_case_station_1( &amfm );
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
       
    amfm_case_station_2( &amfm );
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    amfm_case_station_3( &amfm );
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    amfm_case_station_4( &amfm );
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    amfm_case_station_5( &amfm );
    // 10 seconds delay
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

// ------------------------------------------------------------------------ END