Broadcast the music via the FM radio band using the Si4713-B30 and STM32F031K6
Superior performance in FM broadcasting covering a frequency range from 76MHz to 108MHz
Published Oct 01, 2024
Click board™
RadioStation Click
Dev. board
Nucleo 32 with STM32F031K6 MCU
Compiler
NECTO Studio
MCU
STM32F031K6
Combined with the capability to broadcast both music and informational data, this project is a match for anyone looking to explore the world of FM broadcasting or to develop applications requiring FM signal transmission
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Hardware Overview
How does it work?
RadioStation Click is based on the Si4713-B30, an FM radio transmitter with receive power scan from Silicon Labs. The RadioStation Click broadcasts the audio signal by utilizing the principles of FM radio broadcasting. The audio signal, brought to the low noise analog input terminals of the Si4713-B30 routed to a mini 3.5 female jack on board, is attenuated and converted into an alias-free, digital format. The digitalized audio is then sent to the digital signal processor (DSP) section of the Si4713-B30 IC, which provides modulation adjustment and audio dynamic range control of the signal for the best listening experience. The audio signal is processed to have the optimal dynamic qualities. Also, Si4713 has programmable low audio and high audio-level indicators that enable and
disable the carrier signal based on the presence of audio content. The Si4713-B30 IC can be used to measure the received signal. The antenna which is 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™. The Si4713-B30 integrates the complete transmit functions for standards-compliant unlicensed FM broadcast stereo transmission. The user application must comply with the local radio frequency (RF) transmission regulations. RadioStation Click uses a standard 2-Wire I2C interface to communicate with the host
MCU, supporting clock frequency of up to 400KHz. The I2C address can be selected over the SEN pin of the mikroBUS™ socket, depending on the logic state. The radio transmitter can be reset over the RST pin, which will, among others, disable analog and digital circuitry. The device will interrupt the host MCU over the INT pin if a condition occurs, such as the frequency exceeding the deviation level. 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. However, the Click board™ 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
Nucleo 32 with STM32F031K6 MCU board provides an affordable and flexible platform for experimenting with STM32 microcontrollers in 32-pin packages. Featuring Arduino™ Nano connectivity, it allows easy expansion with specialized shields, while being mbed-enabled for seamless integration with online resources. The
board includes an on-board ST-LINK/V2-1 debugger/programmer, supporting USB reenumeration with three interfaces: Virtual Com port, mass storage, and debug port. It offers a flexible power supply through either USB VBUS or an external source. Additionally, it includes three LEDs (LD1 for USB communication, LD2 for power,
and LD3 as a user LED) and a reset push button. The STM32 Nucleo-32 board is supported by various Integrated Development Environments (IDEs) such as IAR™, Keil®, and GCC-based IDEs like AC6 SW4STM32, making it a versatile tool for developers.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
32
Silicon Vendor
STMicroelectronics
Pin count
32
RAM (Bytes)
4096
You complete me!
Accessories
Click Shield for Nucleo-32 is the perfect way to expand your development board's functionalities with STM32 Nucleo-32 pinout. The Click Shield for Nucleo-32 provides two mikroBUS™ sockets to add any functionality from our ever-growing range of Click boards™. We are fully stocked with everything, from sensors and WiFi transceivers to motor control and audio amplifiers. The Click Shield for Nucleo-32 is compatible with the STM32 Nucleo-32 board, providing an affordable and flexible way for users to try out new ideas and quickly create prototypes with any STM32 microcontrollers, choosing from the various combinations of performance, power consumption, and features. The STM32 Nucleo-32 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/programmer and come with the STM32 comprehensive software HAL library and various packaged software examples. This development platform provides users with an effortless and common way to combine the STM32 Nucleo-32 footprint compatible board with their favorite Click boards™ in their upcoming projects.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 32 with STM32F031K6 MCU as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for RadioStation Click driver.
Key functions:
radiostation_get_asq_status- This function returns status information about the audio signal quality and current FM transmit frequencyradiostation_power_up- This function powers up the chip with default settingsradiostation_get_tune_status- This function returns status information which is set by radiostation_get_tune_measure, radiostation_set_tune_frequency or radiostation_set_tune_power
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief RadioStation Click example
*
* # Description
* RadioStation click can be used to broadcast the music via the FM radio band
* ( which operates in the frequency range of 76MHz to 108MHz ).
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization driver enable's - I2C and sets transmit_frequency.
*
* ## Application Task
* In this example Radio Station Click is receiving signal from audio connector and broadcasting
* it on 100.00 MHz frequency.
*
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "radiostation.h"
// ------------------------------------------------------------------ VARIABLES
static radiostation_t radiostation;
static radiostation_cmd_t radiostation_cmd;
static log_t logger;
static uint8_t buff[ 16 ];
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
radiostation_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.
radiostation_cfg_setup( &cfg, true );
RADIOSTATION_MAP_MIKROBUS( cfg, MIKROBUS_1 );
radiostation_init( &radiostation, &cfg );
radiostation.transmit_frequency = 10000;
radiostation.status = 0xFF;
radiostation_default_cfg( &radiostation, &radiostation_cmd );
}
void application_task ( void )
{
radiostation_get_asq_status( &radiostation, &radiostation_cmd, &buff[ 0 ] );
Delay_ms( 50 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
