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使用Si4703和STM32F410RB保持信息畅通和娱乐

调频,调高音量,尽情摇滚!

FM Click with Nucleo 64 with STM32F410RB MCU

已发布 10月 08, 2024

点击板

FM Click

开发板

Nucleo 64 with STM32F410RB MCU

编译器

NECTO Studio

微控制器单元

STM32F410RB

只需插上耳机,无论你身在何处,都可以收听你喜爱的电台!

A

A

硬件概览

它是如何工作的?

FM Click基于Si4703,这是一款来自Silicon Labs的广播FM收音机调谐器。该收音机在全球范围内的FM波段工作,频率范围为76-108MHz,天线使用耳机。立体声音频连接器支持三和四导线耳机,建议电缆长度为1.1m至1.45m,以获得最佳信号接收效果。Si4703是行业中体积最小的FM调谐器之一,配备了32.768kHz的参考时钟,以获得更好的频率容差。它 具有左右两个音频输出。每个输出使用来自德州仪器

的音频功率放大器LM4864来放大通道输出。这些放大器可以提供大约200mW的连续平均功率到8Ω负载。FM Click也可以作为立体声设备和单声道使用。FM Click可以通过mikroBUS™插座的I2C串行接口与主机MCU通信。除了通信引脚之外,此板还使用了其他几个引脚。SEN引脚路由到mikroBUS™插座的CS引脚,用作串行接口激活信号,与I2C引脚结合使用,形 成3线接口。RST引脚用作通用复位功能,另外还有两

个用户可配置的引脚,GP2和GP1,路由到mikroBUS™插座的AN和INT引脚。这些I/O引脚可以用作中断请求(搜索/调谐或RDS准备)或立体声/单声道指示器。这个Click板™只能使用3.3V逻辑电压电平操作。在使用具有不同逻辑电平的MCU之前,板子必须执行适当的逻辑电压电平转换。但是,该Click板™配备了一个包含函数和示例代码的库,可用作进一步开发的参考。

FM Click hardware overview image

功能概述

开发板

Nucleo-64 搭载 STM32F410RB MCU 提供了一种经济高效且灵活的平台,供开发者探索新想法并原型设计他们的项目。该板利用 STM32 微控制器的多功能性,使用户能够为他们的项目选择最佳的性能与功耗平衡。它配备了 LQFP64 封装的 STM32 微控制器,并包含了如用户 LED(同时作为 ARDUINO® 信号)、用户和复位按钮,以及 32.768kHz 晶体振荡器用于精确的计时操作等基本组件。Nucleo-64 板设计考虑到扩展性和灵活性,它特有的 ARDUINO® Uno

V3 扩展连接器和 ST morpho 扩展引脚头,提供了对 STM32 I/O 的完全访问,以实现全面的项目整合。电源供应选项灵活,支持 ST-LINK USB VBUS 或外部电源,确保在各种开发环境中的适应性。该板还配备了一个具有 USB 重枚举功能的板载 ST-LINK 调试器/编程器,简化了编程和调试过程。此外,该板设计旨在简化高级开发,它的外部 SMPS 为 Vcore 逻辑供电提供高效支持,支持 USB 设备全速或 USB SNK/UFP 全速,并内置加密功能,提升了项目的功效

和安全性。通过外部 SMPS 实验的专用连接器、 用于  ST-LINK 的 USB 连接器以及 MIPI® 调试连接器,提供了更多的硬件接口和实验可能性。开发者将通过 STM32Cube MCU Package 提供的全面免费软件库和示例得到广泛支持。这些,加上与多种集成开发环境(IDE)的兼容性,包括 IAR Embedded Workbench®、MDK-ARM 和 STM32CubeIDE,确保了流畅且高效的开发体验,使用户能够充分利用 Nucleo-64 板在他们的项目中的能力。

Nucleo 64 with STM32C031C6 MCU double side image

微控制器概述 

MCU卡片 / MCU

default

建筑

ARM Cortex-M4

MCU 内存 (KB)

128

硅供应商

STMicroelectronics

引脚数

64

RAM (字节)

32768

你完善了我!

配件

Click Shield for Nucleo-64 配备了两个专有的 mikroBUS™ 插座,使得所有的 Click board™ 设备都可以轻松地与 STM32 Nucleo-64 开发板连接。这样,Mikroe 允许其用户从不断增长的 Click boards™ 范围中添加任何功能,如 WiFi、GSM、GPS、蓝牙、ZigBee、环境传感器、LED、语音识别、电机控制、运动传感器等。您可以使用超过 1537 个 Click boards™,这些 Click boards™ 可以堆叠和集成。STM32 Nucleo-64 开发板基于 64 引脚封装的微控制器,采用 32 位 MCU,配备 ARM Cortex M4 处理器,运行速度为 84MHz,具有 512Kb Flash 和 96KB SRAM,分为两个区域,顶部区域代表 ST-Link/V2 调试器和编程器,而底部区域是一个实际的开发板。通过 USB 连接方便地控制和供电这些板子,以便直接对 Nucleo-64 开发板进行编程和高效调试,其中还需要额外的 USB 线连接到板子上的 USB 迷你接口。大多数 STM32 微控制器引脚都连接到了板子左右边缘的 IO 引脚上,然后连接到两个现有的 mikroBUS™ 插座上。该 Click Shield 还有几个开关,用于选择 mikroBUS™ 插座上模拟信号的逻辑电平和 mikroBUS™ 插座本身的逻辑电压电平。此外,用户还可以通过现有的双向电平转换器,使用任何 Click board™,无论 Click board™ 是否在 3.3V 或 5V 逻辑电压电平下运行。一旦将 STM32 Nucleo-64 开发板与我们的 Click Shield for Nucleo-64 连接,您就可以访问数百个工作于 3.3V 或 5V 逻辑电压电平的 Click boards™。

Click Shield for Nucleo-64 accessories 1 image

这款标准小型立体声耳机采用顶级立体声电缆和连接器,为用户提供高品质的听觉体验。设计通用兼容性,它们轻松连接到所有MIKROE mikromedia和多媒体板,是您电子项目的理想选择。耳机额定功率为100mW,能够在20Hz至20kHz的广泛频率范围内提供清晰的音频。它们具有100 ± 5dB的灵敏度和32Ω ± 15%的阻抗,确保了最佳的音质。直径为Φ15mm的扬声器提供清晰、沉浸式的音频。这些耳机具有性价比高、多功能的特点,非常适合测试您的原型设备,为您的项目提供经济实惠、可靠的音频解决方案。

FM Click accessories image

使用的MCU引脚

mikroBUS™映射器

General Purpose I/O
PC0
AN
Reset
PC12
RST
Serial Enable Input
PB12
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
General Purpose I/O
PC14
INT
NC
NC
TX
NC
NC
RX
Serial Clock Input
PB8
SCL
Serial Data Input
PB9
SDA
NC
NC
5V
Ground
GND
GND
1

“仔细看看!”

Click board™ 原理图

FM Click Schematic schematic

一步一步来

项目组装

Click Shield for Nucleo-64 accessories 1 image hardware assembly

从选择您的开发板和Click板™开始。以Nucleo 64 with STM32F410RB MCU作为您的开发板开始。

Click Shield for Nucleo-64 accessories 1 image hardware assembly
Nucleo 64 with STM32F401RE MCU front image hardware assembly
LTE IoT 5 Click front image hardware assembly
Prog-cut hardware assembly
LTE IoT 5 Click complete accessories setup image hardware assembly
Nucleo-64 with STM32XXX MCU Access MB 1 Mini B Conn - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Clicker 4 for STM32F4 HA MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

实时跟踪您的结果

通过调试模式的应用程序输出

1. 一旦代码示例加载完成,按下 "DEBUG" 按钮将启动构建过程,并将其编程到创建的设置上,然后进入调试模式。

2. 编程完成后,IDE 中将出现一个带有各种操作按钮的标题。点击绿色的 "PLAY" 按钮开始读取通过 Click board™ 获得的结果。获得的结果将在 "Application Output" 标签中显示。

DEBUG_Application_Output

软件支持

库描述

这个库包含FM Click驱动程序的API。

关键功能:

  • fm_get_received_signal_strength_indicator - 此函数读取接收信号强度指示器

  • fm_get_channel_frequency - 此函数根据波段和间距设置计算当前频道频率

  • fm_get_channel - 此函数从READCHAN寄存器读取CHANNEL位

开源

代码示例

这个示例可以在 NECTO Studio 中找到。欢迎下载代码,或者您也可以复制下面的代码。

/*!
 * \file 
 * \brief Fm Click example
 * 
 * # Description
 * This click represent FM radio tuner which supports worldwide FM band (76 – 108 MHz)
 * and has a set of features such as automatic frequency and gain control, seek tuning and volume control.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initializing I2C driver, powering up device, setting basic settings for Europe, 
 * setting values of seek threshold, volume, snr threshold and impulse detection threshold.
 * Seek and memorize 5 radio stations with a signal strength above the set limit.
 * 
 * ## Application Task  
 * Tunes all memorized stations. Switches the stations each 10 seconds.
 * 
 * ## Additional Functions
 * - void fm_case_plus( fm_t *ctx )      - Increases volume
 * - void fm_case_minus( fm_t *ctx )     - Decreases volume
 * - void fm_case_seek( fm_t *ctx )      - Seeks next station
 * - void fm_case_tune( fm_t *ctx )      - Tunes default station
 * - void fm_case_memorize( )            - Memorizes current station
 * - void fm_case_station1( fm_t *ctx )  - Tunes memorized station 1
 * - void fm_case_station2( fm_t *ctx )  - Tunes memorized station 2
 * - void fm_case_station3( fm_t *ctx )  - Tunes memorized station 3
 * - void fm_case_station4( fm_t *ctx )  - Tunes memorized station 4
 * - void fm_case_station5( fm_t *ctx )  - Tunes memorized station 5
 * - void fm_case_mute( fm_t *ctx )      - Mutes device
 * - void fm_case_tune_up( fm_t *ctx )   - Fine tunes frequency
 * - void fm_case_tune_down( fm_t *ctx ) - Fine tunes frequency
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "fm.h"

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

#define SIGNAL_STRENGTH_LOWER_LIMIT 25

static fm_t fm;
static log_t logger;

static uint16_t received_signal_strength_indicator;
static uint16_t station_channel;
static uint16_t station1;
static uint16_t station2;
static uint16_t station3;
static uint16_t station4;
static uint16_t station5;

static uint8_t memory;
static uint8_t mute;
static uint8_t received_data;
static uint8_t data_ready;
static uint8_t error_flag;
static uint8_t cnt;

static float channel_frequency;
static float tuned_frequency;
static float tune_freq;

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

void fm_case_plus ( fm_t *ctx  )
{
    error_flag = fm_volume_up( ctx );

    if ( error_flag == 0 )
    {
        log_printf( &logger, "volume up\r\n" );
    }
    else
    {
        log_printf( &logger, "volume max\r\n" );
    }
}

void fm_case_minus ( fm_t *ctx )
{
    error_flag = fm_volume_down( ctx );

    if ( error_flag == 0 )
    {
        log_printf( &logger, "volume down\r\n" );
    }
    else
    {
        log_printf( &logger, "volume min\r\n" );
    }
}

void fm_case_seek ( fm_t *ctx )
{
    fm_seek( ctx );

    Delay_ms( 500 );

    fm_end_seek( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );
    station_channel = fm_get_channel( ctx );
}

void fm_case_tune ( fm_t *ctx )
{
    error_flag = fm_tune( ctx, tune_freq );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    if ( error_flag == 0 )
    {
        received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
        tuned_frequency = fm_get_channel_frequency( ctx );
        station_channel = fm_get_channel( ctx );

        log_printf( &logger, "tune complete\r\n" );

        log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

        log_printf( &logger, "tuned frequency: %.2f MHz\r\n", tuned_frequency );
        log_printf( &logger, "-----------------------\r\n" );
    }
    else
    {
        log_printf( &logger, "frequency not in valid range\r\n" );
    }
}

void fm_case_memorize ( )
{
    switch ( memory )
    {
        case 0 :
        {
            station1 = station_channel;
            memory += 1;

            log_printf( &logger, "station 1 memorized\r\n" );

            break;
        }
        case 1 :
        {
            station2 = station_channel;
            memory += 1;

            log_printf( &logger, "station 2 memorized\r\n" );

            break;
        }
        case 2 :
        {
            station3 = station_channel;
            memory += 1;

            log_printf( &logger, "station 3 memorized\r\n" );
            
            break;
        }
        case 3 :
        {
            station4 = station_channel;
            memory += 1;

            log_printf( &logger, "station 4 memorized\r\n" );

            break;
        }
        case 4 :
        {
            station5 = station_channel;
            memory = 0;

            log_printf( &logger, "station 5 memorized\r\n" );

            break;
        }
        default :
        {
            break;
        }
    }
}

void fm_case_mute ( fm_t *ctx )
{
    if ( mute == 0 )
    {
        fm_mute_enable( ctx );

        log_printf( &logger, "mute enabled\r\n" );

        mute = 1;
    }
    else if ( mute == 1 )
    {
        fm_mute_disable( ctx );

        log_printf( &logger, "mute disabled\r\n" );

        mute = 0;
    }
}

void fm_case_station_1 ( fm_t *ctx  )
{
    fm_tune_channel( ctx, station1 );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );

    log_printf( &logger, "station 1 tuned\r\n" );

    log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

    log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
    log_printf( &logger, "-----------------------\r\n" );
}

void fm_case_station_2 ( fm_t *ctx )
{
    fm_tune_channel( ctx, station2 );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );

    log_printf( &logger, "station 2 tuned\r\n" );

    log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

    log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
    log_printf( &logger, "-----------------------\r\n" );
}

void fm_case_station_3 ( fm_t *ctx )
{
    fm_tune_channel( ctx, station3 );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );

    log_printf( &logger, "station 3 tuned\r\n" );

    log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

    log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
    log_printf( &logger, "-----------------------\r\n" );
}

void fm_case_station_4 ( fm_t *ctx )
{
    fm_tune_channel( ctx, station4 );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );

    log_printf( &logger, "station 4 tuned\r\n" );

    log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

    log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
    log_printf( &logger, "-----------------------\r\n" );
}

void fm_case_station_5 ( fm_t *ctx )
{
    fm_tune_channel( ctx, station5 );

    Delay_ms( 100 );

    fm_end_tune( ctx );

    Delay_ms( 10 );

    received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
    channel_frequency = fm_get_channel_frequency( ctx );

    log_printf( &logger, "station 5 tuned\r\n" );

    log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

    log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
    log_printf( &logger, "-----------------------\r\n" );
}

void fm_case_tune_up ( fm_t *ctx )
{
    error_flag = fm_fine_tune_up( ctx );

    if ( error_flag == 0 )
    {
        Delay_ms( 100 );

        fm_end_tune( ctx );

        Delay_ms( 10 );
        
        received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
        channel_frequency = fm_get_channel_frequency( ctx );
        station_channel = fm_get_channel( ctx ); 

        log_printf( &logger, "tune up\r\n" );

        log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

        log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
        log_printf( &logger, "-----------------------\r\n" );
    }
    else
    {
        log_printf( &logger, "upper band limit reached\r\n" );
    }
}

void fm_case_tune_down ( fm_t *ctx )
{
    error_flag = fm_fine_tune_down( ctx );

    if ( error_flag == 0 )
    {
        Delay_ms( 100 );

        fm_end_tune( ctx );

        Delay_ms( 10 );
    
        received_signal_strength_indicator = fm_get_received_signal_strength_indicator( ctx );
        channel_frequency = fm_get_channel_frequency( ctx );
        station_channel = fm_get_channel( ctx );

        log_printf( &logger, "tune down\r\n" );

        log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );

        log_printf( &logger, "tuned frequency: %.2f MHz\r\n", channel_frequency );
        log_printf( &logger, "-----------------------\r\n" );
    }
    else
    {
        log_printf( &logger, "lower band limit reached\r\n" );
    }
}

void fm_case_wrong_command ( )
{
    log_printf( &logger, "wrong command\r\n" );
}

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

void application_init ( void )
{
    log_cfg_t log_cfg;
    fm_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.

    fm_cfg_setup( &cfg );
    FM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    fm_init( &fm, &cfg );
    
    Delay_ms( 500 );
    fm_default_cfg( &fm );

    memory = 0;
    mute = 0;
    fm_case_mute( &fm );
     
    for ( cnt = 0; cnt < 5;  )
    {
        log_printf( &logger, "seeking...\r\n" );
        do 
        {
            received_signal_strength_indicator = 0;
            fm_case_seek( &fm );
        }
        while ( received_signal_strength_indicator < SIGNAL_STRENGTH_LOWER_LIMIT ); //rssi value
        
        log_printf( &logger, "station found\r\n" );
        log_printf( &logger, "rssi: %u dBuV\r\n", received_signal_strength_indicator );
        log_printf( &logger, "channel frequency: %.2f MHz\r\n", channel_frequency );
        fm_case_memorize( );
        log_printf( &logger, "-----------------------\r\n" );
        Delay_ms( 100 );
        cnt++;
    }  
    
    mute = 1;
    fm_case_mute( &fm );
    log_printf( &logger, "playing memorized stations...\r\n\r\n" );
}

void application_task ( void )
{ 
    fm_case_station_1( &fm );
    Delay_ms( 10000 );
       
    fm_case_station_2( &fm );
    Delay_ms( 10000 );
    
    fm_case_station_3( &fm );
    Delay_ms( 10000 );
    
    fm_case_station_4( &fm );
    Delay_ms( 10000 );
    
    fm_case_station_5( &fm );
    Delay_ms( 10000 );
}

void main ( void )
{
    application_init( );

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

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

额外支持

资源

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