Intermediate
30 min
0

Explore your favorite melodies with Si4731 and MK60DN512VLQ10

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

AM/FM Click with Fusion for ARM v8

Published Aug 29, 2023

Click board™

AM/FM Click

Development board

Fusion for ARM v8

Compiler

NECTO Studio

MCU

MK60DN512VLQ10

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

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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.

AM/FM Click hardware overview image

Features overview

Development board

Fusion for ARM v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different ARM® Cortex®-M based MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, Fusion for ARM v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the Fusion for ARM v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. Fusion for ARM v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

Fusion for ARM v8 horizontal image

Microcontroller Overview

MCU Card / MCU

default

Type

8th Generation

Architecture

ARM Cortex-M4

MCU Memory (KB)

512

Silicon Vendor

NXP

Pin count

144

RAM (Bytes)

131072

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.

AM/FM Click accessories image

Used MCU Pins

mikroBUS™ mapper

General-Purpose Output 1
PE2
AN
Reset
PE4
RST
I2C Address Selection
PE11
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Shutdown
PD4
PWM
General-Purpose Output 2
PA24
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PD8
SCL
I2C Data
PD9
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Schematic

AM/FM Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Fusion for ARM v8 as your development board.

Fusion for PIC v8 front image hardware assembly
GNSS2 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
v8 SiBRAIN Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

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 ( mute_flag == 0 )
    {
        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 ( status == 0 )
    {
        log_printf( &logger, "> > > app init done < < <\r\n" );
    }
    else if ( status == 1 )
    {
        log_printf( &logger, "> > >    timeout    < < <\r\n" );
    }
    
    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 );
    Delay_ms( 10000 );
       
    amfm_case_station_2( &amfm );
    Delay_ms( 10000 );
    
    amfm_case_station_3( &amfm );
    Delay_ms( 10000 );
    
    amfm_case_station_4( &amfm );
    Delay_ms( 10000 );
    
    amfm_case_station_5( &amfm );
    Delay_ms( 10000 );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

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

Additional Support

Resources