RDA5807 Arduino Library

It is a cross-platform Arduino Library for RDA5807 and RDA7088 family device from RDA. You can use it with official Arduino boards, ATtiny, STM32 , ESP32 and more. It works with I2C protocol and can provide you an easier interface to control the RDA5807 device. This library was built based on "RDA microelectronics RDA5807MS - SINGLE-CHIP BROADCAST FM RADIO TUNER - Rev.1.1–Aug.2015" and RDA microelectronics RDA5807FP - SINGLE-CHIP BROADCAST FM RADIO TUNER. Please, be guided by the table of contents below to make the best use of this documentation.

This library can be freely distributed using the MIT Free Software model. It means you can copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software. See MIT License for more details.

Contact: [email protected].

Attention

The RDA5807 device can work safaty from 2.7 to 3.3V. Be aware that some Arduino board oparates with 5V instead of 3.3V (for example: Arduino Uno and Arduino Nano). A wrong setup can make the system unstable or damage the RDA5807 device. Preferably use an Arduino or other boards like ESP32 and ESP8266 that work with 3.3V voltage. If you are not using a 3.3V version of board, you must use a kind of 5V to 3.3V converter to feed the RDA5807 device and to send signal to SCLK and SDIO/SDA pins. In my experiments, I used an Arduino Nano (5V) and fed the RDA5807 with 3.3V (from the Nano. See the Pin 3.3V of the Arduino). It has worked. However, this is at your own risk.

Preface

The RDA5807 is a FM DSP integrated circuit receiver (50 to 115MHz) with low noise amplifier support. This device requires very few external components if compared with other similar devices. It also supports RDS/RBDS functionalities, direct auto gain control (AGC) and real time adaptive noise cancellation function. The PU2CLR RDA5807 Arduino Library was developed to take the most functionalities of this device. Knowing the functioning aspects of this receiver and sharing this knowledge were the main motivation for the development of this library. Currently, this library has more than 80 functions implemented. I hope this work will be useful for electronics experimenters and hobbyists.

This documentation exposes the understanding of the author of this library about the functioning of the IC RDA5807 family. That said, it is possible that some information is not correct. If you find any wrong or inaccurate information, please let me know.

Please, check the API Documentation for more details.

Your support is important.

If you want to support this library development, consider joining this project via Github. Alternatively, make suggestions on new features and report errors if you find them. Thank you!

There is a Facebook group called DSP receivers for hobbyists where the purpose is exchanging experiences with projects based on RDA5807 IC devices.

RDA5807 family devices and RDA5807 Arduino Library

This library has been successfully tested on RDA5807M and RDA5807FP devices. The videos below show some examples of using this library with RDA5807M and RDA5807FP.

{% include video01.html %}

See FM receiver based on RDA5807 and LilyGO/T-Embed panel

{% include video03.html %}

See RDS and RDA5807 using this library - youtube

{% include video02.html %}

See RDS and TFT Display example - youtube

RDA5807 main features implemented by this library

76–108 MHz
Seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Programmable de-emphasis (50/75 μs)
Adaptive noise suppression
Volume control
Bass
Mute control
Mono/Stereo control
RDS/RBDS Processor
I2S Digital Audio (RDA5807FP)
LNA (Low Noise Amplifiers Amplificadores)
Softmute
Stereo / Mono
Step

The Sketch RDA5807_00_CIRCUIT_TEST uses the main functions implemented in this library
The examples folder can guide you in building your own receiver
See API documentation

Library Installation

The easiest method to install this library is via your Arduino IDE. All you have to do is:

Select Tools menu;
Select Manage Libraries option;
In the text box (top windows), type PU2CLR or RDA5807;
Select the PU2CLR RDA5807.

The images below show how you can install this library via your Arduino IDE from Manage Libraries tool.

Installing via the repository

With this approach, you will have the most current version of the library. However, it may not be the most stable version. This is because the current version is always in development. Prefer releases. Do you need some old version (release) of this library? If yes, check here.

First, you have to download this library in zip format.
After, unzip the RDA5807-master.zip file in your Arduino Library folder.

On Windows: "My Documents\Arduino\libraries"
On MAC OS: ˜/Documents/Arduino/libraries
On Linux: ˜/home/Arduino/libraries

Installing the most current version via arduino-cli

The commands below Install the latest version of the PU2CLR RDA5807 Arduino Library from github. As said before, unlike a release (installed from Arduino IDE) this method installs the current version of the PU2CLR RDA5807 Arduino Library (latest modifications even if not yet released).

On macOS or Linux

curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
export ARDUINO_LIBRARY_ENABLE_UNSAFE_INSTALL=true
./bin/arduino-cli lib install --git-url https://github.com/pu2clr/RDA5807

On Windows 10 or 11

Run the command shell (cmd / Command Prompt) and follow the steps below.

echo off  
curl -fsSL https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_Windows_64bit.zip --output arduinocli.zip
tar -xf arduinocli.zip 
set ARDUINO_LIBRARY_ENABLE_UNSAFE_INSTALL=true
.\arduino-cli lib install --git-url https://github.com/pu2clr/RDA5807

How to use the RDA5807 Arduino Library in your sketch

The following source-code snippet shows a common way of using the RDA5807 library in your application. Click here to know about all the functions integrated in this library.

#include <RDA5807.h>

RDA5807 rx;

void setup() {
    .
    .
    .
    // Start your receiver here
    rx.setup();
    rx.setVolume(6);
    rx.setFrequency(some_frequency); // Example 10390 for 103,9 MHz
    .
    .
    .
}

void loop() {
    //  Control your receiver here 
    .
    .
    .
}

Minimal receiver implementation with this library

The code below shows the minimal implementation using this library.

#include <RDA5807.h> 
RDA5807 rx; 
void setup() {
  rx.setup(); // Starts the receiver with default parameters
  rx.setFrequency(10390); // Tunes in 103.9 MHz  - Switch to your local favorite station
}
void loop() {

}

A minimalist receiver implementation with two pushbuttons

The following code illustrates a minimalist implementation of a receiver based on RDA5807 and this library. For this receiver, the user has two pushbuttons to tune station (Seek Up and Seek Down).

#include <RDA5807.h> // It is a minimal receicer with two push buttons (ATmega328 - Uno, Nano etc)
RDA5807 rx; 
void setup() {
  pinMode(4, INPUT_PULLUP); // Arduino pin 4 - Seek station down
  pinMode(5, INPUT_PULLUP); // Arduino pin 5 - Seek station up
  rx.setup(); // Starts the receiver with default parameters
  rx.setFrequency(10390); // Tunes in 103.9 MHz  - Switch to your local favorite station
}
void loop() {
  if (digitalRead(4) == LOW) rx.seek(RDA_SEEK_WRAP,RDA_SEEK_DOWN);
  if (digitalRead(5) == LOW) rx.seek(RDA_SEEK_WRAP,RDA_SEEK_UP);
  delay(200);
}

You can use the sketch above with the circuit shown below.

Examples summary

The following table shows the main examples implemented in this library. These examples can guide you to build your own receiver.

Sketch Name	Description
RDA5807_00_CIRCUIT_TEST	Useful to check the circuit and many functions implemented in this library
RDA5807_00_MINIMAL_RECEIVER	It is a minimal receicer with two push buttons (ATmega328 - Uno, Nano etc)
RDA5807_01_SERIAL_MONITOR/ RDA5807_01_ALL_TEST_SERIAL_MONITOR	More about Tune, Volume, Seek and RDS features
RDA5807_01_SERIAL_MONITOR/ RDA5807_01_RDS_TEST_SERIAL_MONITOR	Test RDS functions using Serial Monitor
RDA5807_01_SERIAL_MONITOR/ RDA5807_02_ESP32	Test and validation of RDA5807 on ESP32 board
RDA5807_01_SERIAL_MONITOR/ RDA5807_03_STM32	Test and validation of RDA5807 on STM32 board
RDA5807_02_TFT_display	This sketch uses an Arduino Pro Mini, 3.3V (8MZ) with a SPI TFT ST7735 1.8
RDA5807_03_ATTINY_84_85	Test and validation of RDA5807 on ATtiny84 device
RDA5807_04_NOKIA5110	This sketch uses an Arduino Nano with NOKIA 5110 display
RDA5807_05_LCD16X02	This sketch uses an Arduino Nano with LCD16X02 DISPLAY
RDA5807_05_LCD16X02_ESP32	This sketch uses an ESP32 with LCD16X02 DISPLAY
RDA5807_05_LCD16X02_ESP32_I2S	I2S setup - This sketch uses an ESP32 with LCD16X02 DISPLAY and MAX98357A I2S setup
RDA5807_06_UNO_TM1638	This sketch drives the RDA5807 FM receiver and TM1638 (seven-segment display control)
Arduino Nano and OLED with Tiny4kOLED library	Nano and OLED implementation V1
Arduino Nano and OLED (Adafruit_GFX and Adafruit_SSD1306)	This sketch works on Atmega328 and LGT8FX based board. It is a I2C OLED setup
LilyGO/T-Embed and RDA5807 setup	This sketch was an adaptation of the Volos's sketch and uses PU2CLR RDA5807 Arduino Library with LilyGO T-Embed.

See the folder examples do know more

Boards where this library has been tested

This library can be useful to develop cross-platform software. So far, it has been successfully tested on the architectures shown below. Please, pay attention to the pins used for I2C communication.

	Board	Need voltage converter	I²C Pins	Features
1	Arduino Pro Mini 3.3V 8MHz	No	A4 and A5	More...
2	Mega 2560 Pro	Yes	20 and 21	More...
3	ESP WEMOS LOLIN32	No	GPIO21 and GPIO22 [4]	More...
4	ESP32 Dev Module	No	GPIO21 and GPIO22 [4]	More...
5	ESP32 Wrover Module	No	GPIO21 and GPIO22 [4]	More...
6	ESP8266	No	GPIO4 and GPIO5	More...
7	Arduino UNO	Yes	A4 and A5	More...
8	Arduino NANO ATmega 328	Yes	A4 and A5	More...
9	Arduino NANO ATmega 168	Yes	A4 and A5	More...
10	Arduino NANO 33 IoT	No [6]	A4 and A5	More...
11	Arduino Yún / ATmega-32u4	Yes	2 and 3	More...
12	ATtiny84	No	7 and 8	More...
13	ATtiny85	No	5 and 7	More...
14	Arduino DUE	No	2 and 3	More...
15	BlueDuino 3.3V (ATmega-32u4)	No	2 and 3	More...
16	Arduino Mini Pro 5V 16Mhz	Yes	2 and 3	More...
17	STM32F746G-DISCO	No	-	More...
18	STM32F103 Series	No	PB6 (SCL) and PB7(SDA)	More...
19	STM32F411 Series	No	PB6 (SCL) and PB7(SDA)	More...
20	Raspberry Pi Pico	No	GP0 (0) and GP1 (1)	More...
21	WeAct Studio RP2040 Pico	No	GP0 (0) and GP1 (1)	More...
22	Seeeduino XIAO	No	A4 and A5	More...
23	Teensy 3.1	No	A4 and A5	More...
24	Teensy 4.1	No	A4 and A5	More...
25	Atmega8	No	PC4 and PC5	More...
26	Atmega32	No	PC1 and PC0	More...
27	Atmega128	No	PC1 and PC0	More...
28	LGT8F328P	No	A4 and A5	More...
29	LUATOS ESP32C3	No	GPIO4 and GPIO5	More...

More about ESP boards on ESPRESSIF Development Boards.
More about BlueDuino on Seed.
On Arduino.cc you can see the technical specification about many board.
It seams that in some ESP32 board, the I²C bus is not configured properly by default. However, you can set almost any pin on ESP32 to setup I²C capabilities. All you have to do is call Wire.begin(SDA, SCL); where SDA and SCL are the ESP32 GPIO pins. See the folder examples to check how to use ESP32 devices.
Arduino Nano 33 BLE only supports 3.3V I/Os and is NOT 5V tolerant so please make sure you are not directly connecting 5V signals to this board or it will be damaged. Also, as opposed to Arduino Nano boards that support 5V operation, the 5V pin does NOT supply voltage but is rather connected, through a jumper, to the USB power input.

RDA5807M breakout

The photos below show a Breakout that uses the RDA5807M.

Front side

Back side

Judging by some documentations found on the Internet, some breakouts based on RDA5807M have GPIO2, GPIO3 and RCLK functions. Judiging by the "RDA microelectronics RDA5807MS - SINGLE-CHIP BROADCAST FM RADIO TUNER - Rev.1.1–Aug.2015", the RDA5807MS pinout does not have these functions. These documentations is still not clear to the author of this library. So, if you want to use the GPIO features of the RDA5807 architecture, please, prefer the RDA5807FP device (see it below).

RDA5807FP and RDA7088 standalone IC

If you are using the standalone RDA5807FP you must add some parts to make it work. In my opinion, there is no big reasons to use the RDA5807FP instead of the RDA5807M breakout in most applications. I think the most important situations are the possibility to use the digital audio configuration via I2S protocol or GPIO setup (Stereo indicator, interrupt etc). This library has function to deal with I2S and GPIO.

The RDA7088 has the same RDA5807FP pinout. However, I have noticed that some functions available in this library do not work prorpely. For example: RDS, Seek and Stereo functions have not worked on RDA7088 during tests with RDA5807 Arduino Library. In contrast, all functions implemented in this library work well on RDA5807FP. Prefer the RDA5807FP.

The photo below shows the RDA5807FP on a SOP16 board adapter.

RDA5807FP PINOUT

The image below shows the RDA5807FP pinout.

PIN	Label	Description
1	GPIO1	General purpose input/output
2	GND_1	Ground. Must be connected to ground
3	RFGND	RF Ground. Must be connected to the ground or a special RF ground
4	FMIN	FM signal input - Antenna
5	GND_2	Ground. Must be connected to ground
6	GND_3	Ground. Must be connected to ground
7	SCLK	I2C clock
8	SDA	I2C SDA/SDIO
9	RCLK	32.768kHz pasive crystal
10	VDD	3.3V power supply
11	GND_4	Ground. Must be connected to ground
12	ROUT	Right audio output
13	LOUT	Left audio output
14	GND_5	Ground. Must be connected to ground
15	GPIO3	General purpose input/output and stereo indicator
16	GPIO2	General purpose input/output

The two photos below shows the standalone RDA5807FP IC mounted on a homebrew board.

The schematic below shows the basic RDA5807FP setup.

Components	Value
R1	1K
R2	1K
R3	8 ~ 12K
R4	8 ~ 12K
C1	1nF (FMIN)
C2 and C3	4,7 ~ 10uF tantalum capacitor (stereo audio output)
Q1	32768 kHz passive crystal oscillator
J1	Audio stereo jack

The RDA5807FP on an Arduino Uno adapter

The photos below show the RDA5807FP setup on a Arduino Uno board adapter.

{% include video04.html %}

See the presentation video on youtube

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE ARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Schematic

The circuits below can help you to connect the arduino based board to the RDA5807 version you are using. In general, the RDA5807 can be found in kit or breakout form on Aliexpress, Amazon, eBay etc.

RDA5807M Breakout setup

RDA5807M standalone IC setup (without breakout)

RDA5807FP standalone IC setup

Arduino UNO, Pro mini or other based on ATmega 328 wireup.

RDA5807 / Description	Arduino Pin
VCC	3.3V
SDA / SDIO	A4
SCL / SCLK	A5

Arduino, TFT7735 display and Push Buttons wireup.

Arduino UNO, Nano or other based on Atmega328 and SPI TFT ST7735 1.8" wireup

Device name	Device Pin / Description	Arduino Pin
Display TFT
	RST (RESET)	8
	RS or DC	9
	CS or SS	10
	SDI	11
	CLK	13
RDA5807
	VCC	3.3V
	SDIO (pin 8)	A4
	SCLK (pin 7)	A5
Buttons
	Volume Up	4
	Volume Down	5
	Stereo/Mono	6
	RDS ON/off	7
	SEEK (encoder button)	A0/14
Encoder
	A	2
	B	3

RDA5807 breakout, ATtiny84, Encoder and Buttons schematic

RDA5807 breakout, ATtiny84, Encoder and Buttons wireup

RDA5807 pin	Attiny84 REF pin	Physical pin
SEEK_UP	3	10
SEEK_DOWN	5	8
ENCODER_PIN_A	0	13
ENCODER_PIN_B	1	12
SDIO / SDA	SDA	7
SCLK / CLK	SCL	9

RDA5807 breakout, Arduino Nano and Nokia 5110 display wireup

Device name	Nokia 5110	Arduino
NOKIA 5110	Pin function	Nano Pin
	(1) RST (RESET)	8
	(2) CE or CS	9
	(3) DC or DO	10
	(4) DIN or DI or MOSI	11
	(5) CLK	13
	(6) VCC (3V-5V)	+VCC
	(7) BL/DL/LIGHT	+VCC
	(8) GND	GND
--------------------------	-------------------------	--------------
RDA5807	Pin Function
	VCC	3.3V
	SDIO (pin 8)	A4
	SCLK (pin 7)	A5
--------------------------	--------------------------	--------------
Buttons
	Volume Up	4
	Volume Down	5
	Stereo/Mono	6
	RDS ON/off	7
	SEEK (encoder button)	A0/14
--------------------------	--------------------------	---------------
Encoder
	A	2
	B	3

Arduino Nano, RDA5807 and Nokia 5110 setup on Breadboard

RDA5807 breakout, Arduino Nano and LCD16X02 display wireup

Device name	Device Pin / Description	Arduino Pin
LCD 16x2 or 20x4
	D4	D7
	D5	D6
	D6	D5
	D7	D4
	RS	D12
	E/ENA	D13
	RW & VSS & K (16)	GND
	A (15) & VDD	+Vcc
--------------------------	-------------------------	--------------
RDA5807
	VCC	3.3V
	SDIO (pin 8)	A4
	SCLK (pin 7)	A5
--------------------------	--------------------------	--------------
Buttons
	Volume Up	8
	Volume Down	9
	Stereo/Mono	10
	RDS ON/off	11
	SEEK (encoder button)	D14/A0
--------------------------	--------------------------	---------------
Encoder
	A	2
	B	3

RDA5807FP setup, ESP32 and LCD16X02 display wireup

Wire up ESP32 Dev Module, RDA5807 and LCD16x02 or LCD16x04

Device name	Device Pin / Description	Arduino Pin
LCD 16x2 or 20x4
	D4	GPIO18
	D5	GPIO17
	D6	GPIO16
	D7	GPIO15
	RS	GPIO19
	E/ENA	GPIO23
	RW & VSS & K (16)	GND
	A (15) & VDD	+Vcc
--------------------------	-------------------------	--------------
RDA5807FP (See schematic)
	VCC	3.3V
	SDIO / SDA (pin 8)	GPIO21
	SCLK (pin 7)	GPIO22
Buttons
	Volume Up	GPIO32
	Volume Down	GPIO33
	Stereo/Mono	GPIO25
	RDS On/Off	GPIO26
--------------------------	--------------------------	--------------
Encoder
	A	GPIO13
	B	GPIO14
	PUSH BUTTON (encoder)	GPIO27

ATTENTION: Be guided by the ESP32 IO/GPIO pins.

Storing data into the EEPROM

The EEPROM has a lifetime around 100,000 write/erase cycles. The "Atmel" DATASHEET, page 19, you will find "The Atmel® ATmega328P contains 1Kbyte of data EEPROM memory. It is organized as a separate data space, in which single bytes can be read and written. The EEPROM has an endurance of at least 100,000 write/erase cycles". Therefore, writing data to eeprom with each system status change could give an application a very short life. To mitigate this problem, some approaches can be used to save recordings on the EEPROM.

The following approach stores data every time when some important status changes. The idea is to store data only if it is necessary.

Steps:

Select the data you want to keep into the EEPROM;
Add the code to monitor the data in your sketch;
Add code to save the data. In this case, you need to define the criteria that will be used to perform a recording on the EEPROM. In general, a good criteria is: any change of useful data AND elapsed time. It will depend on your application;
Consider using the method EEPROM.update instead EEPROM.write. It will not write information if it is the same stored before. The ESP32 and other MCU, the EEPROM.write implementation works like EEPROM.update;
Add the code to restore data from EEPROM;
Add the code to check if exist useful data stored into EEPROM. It can be a single byte indicating that exist valid information for the system. Use an identification number (ID) that will be understood as valid data by the system.
Add code to erase the information in EEPROM. All you have to do is erasing the identification number. Actually just change the ID value. In other words, you do not need erease all data stored into EEPROM to reset the data to the system.
Add code to RESET the system. At system startup check if a given button is pressed and then erase the ID;

The code below can guide you to deal with the RDA5807 data and Arduino Board EEPROM

#define STORE_TIME 10000  	// Time of inactivity to make the current receiver status writable (10 seconds).

const uint8_t app_id = 35; 	// Application ID. Any value from 1 to 255.  It will be useful to check the EEPROM content before processing useful data
const int eeprom_address = 0;  // Address where the data will be stored into EEPROM
long storeTime = millis(); 	// elapsed time control

RDA5807 rx.

void setup() {

  .
  .
  .

  // If you want to reset the eeprom, keep the  button pressed during statup
  if (digitalRead(GIVEN_BUTTON) == LOW)
  {
	EEPROM.write(eeprom_address, 0); // Changes the application ID. It invalidates all stotred information.
	delay(2000);
  }

  .
  .
  .

  rx.setup();

  // Checking the EEPROM content and read if it has valid information
  if (EEPROM.read(eeprom_address) == app_id)
  {
	readAllReceiverInformation();
  }

  .
  .
  .

}


void saveAllReceiverInformation()
{
  EEPROM.update(eeprom_address, app_id);                  	// stores the app id;
  EEPROM.update(eeprom_address + 1, rx.getVolume());  	// stores the current Volume
  EEPROM.update(eeprom_address + 3, currentFrequency >> 8);   // Store the current frequency
  EEPROM.update(eeprom_address + 4, currentFrequency & 0XFF);
  .
  .
  .

}


void readAllReceiverInformation()
{
  volume = EEPROM.read(eeprom_address + 1);             	// Gets the stored volume;
  currentFrequency = EEPROM.read(eeprom_address + 3) << 8;  // Gets the stored frequency
  currentFrequency |= EEPROM.read(eeprom_address + 4);
  .
  .
  .
}


void loop() {
  .
  .
  .
  // Monitor your data and set statusChanged variable to true if any useful data has changed.
  .
  .
  .

  // check if some status was changed
  if ( statusChanged )
  {
	// If the status has changed and the elapsed time is less than minimal time, wait a bit more for saving new data.
	if ((millis() - storeTime) > STORE_TIME)
	{
  	saveAllReceiverInformation();
  	storeTime = millis();
  	statusChanged = false;
	}
  }

}

The sketches below use the Arduino board internal EEPROM to save data.

The following table shows some examples that implement functions that save and restore data using the Arduino based board EEPROM and ESP32.

Sketch Name	Description
RDA5807_04_NOKIA5110	This sketch uses an Arduino Nano with NOKIA 5110 display
RDA5807_05_LCD16X02	This sketch uses an Arduino Nano with LCD16X02 DISPLAY
RDA5807_05_LCD16X02_ESP32	This sketch uses an ESP32 with LCD16X02 DISPLAY
RDA5807_06_UNO_TM1638	This sketch drives the RDA5807 FM receiver and TM1638 (seven-segment display control)

Extending the RDA5807 Arduino Library by exteding RDA5807 class

The best way to customize the PU2CLR RDA5807 Arduino Library for your needs is extending the current version of the library by using C++ OOP approach.

When should you extend the RDA5807 class?

You have at least two great reasons to extend the RDA5807 class:

you need a function that has not yet been implemented in RDA5807;
you want to change the behavior of an already implemented function.

The code below shows these tow situations.

#include <RDA5807.h>
class MyCustomRDA5807 : public RDA5807 {  // extending the original class RDA5807

private: 
  // Implements some specific members and methods to the new class if necessary
  uint16_t up_limit, down_limit;

  void getBandLimits() { 
    if (this->getBand3Status() == 0) {
      up_limit = 6500;
      down_limit = 5000;
    } else {
      up_limit = this->endBand[this->currentFMBand];
      down_limit = this->startBand[this->currentFMBand];
    }
  }

public:
  // Implements some new members functions to the new class
  int getSoftBlendEnable() {  // A RDA5807 command that PU2CLR RDA5807 Arduino Library does not implement
    rda_reg07 tmp;
    tmp.raw = this->getDirectRegister(0x07).raw;
    return tmp.refined.SOFTBLEND_EN;
  }

  uint16_t getDeviceInfo() {  // another RDA5807 command that PU2CLR RDA5807 Arduino Library does not implement
      rda_reg00 tmp;
      tmp.raw = this->getDirectRegister(0x00).raw;
      return tmp.refined.HIGH_CHIP_ID;
  }

  // Overwriting parent method setFrequencyUp - Chenging the behavior of the setFrequencyUp function
  void setFrequencyUp() {
    getBandLimits();
    if (this->currentFrequency < up_limit)
      this->currentFrequency += (this->fmSpace[currentFMSpace]);
    else
      this->currentFrequency = down_limit;

    setFrequency(this->currentFrequency);
  }

  // Overwriting parent method setFrequencyDown - Chenging the behavior of the setFrequencyDown function
  void setFrequencyDown() {
    getBandLimits();
    if (this->currentFrequency > down_limit)
      this->currentFrequency -= (this->fmSpace[currentFMSpace]);
    else
      this->currentFrequency = up_limit;

    setFrequency(this->currentFrequency);
  }
};

MyCustomRDA5807 radio;  // the instance of your custom class based on RDA5807 class

void setup() {
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Customizing RDA5807 class example.");
  radio.setup();
  radio.setFrequency(10390);
  Serial.println(radio.getSoftBlendEnable());
  Serial.println(radio.getDeviceInfo());
  radio.setBand(3);
  radio.setBand3_50_65_Mode(0);
}

void loop() {

  radio.setFrequency(6500);
  Serial.println(radio.getFrequency());
  delay(2000);
  radio.setFrequencyUp();  // Go to 50 MHz
  Serial.println(radio.getFrequency());
  delay(2000);
  radio.setFrequencyDown();  // Go to 65 MHz
  Serial.println(radio.getFrequency());
  delay(2000);
}

If you use that approach, all you have to do is download the current version of PU2CLR RDA5807 Arduino Library. Instead of using the PU2CLR RDA5807 Arduino Library class directly, you can use your own class that extends the original class. This way, you always have the current version of the library customized for your needs. So, no extra work will be needed when you update the PU2CLR RDA5807 Arduino Library. In other words, your custom code will always be synchronized with the PU2CLR RDA5807 Arduino Library code.

Please, see the Sketches RDA5807_90_EXTENDING_CLASS and RDA5807_91_EXTENDING_CLASS for more details.

Thanks

I would like to thanks to Dimitri, F5SWB, for sharing his project based on RDA5807 (RDA5807 fm chipset / arduino with a Nextion screen F5SWB@2021 / Version 1.18). See RDA5807

More Arduino Projects developed by author

Multipurpose signal generator with SI5351. It is a multipurpose signal generator controlled by Arduino. This project uses the SI5351 from Silicon Labs. The Arduino sketch is configured to control the SI5351 with three channels from 32.768KHz to 160MHz and steps from 1Hz to 1MHz.
Shortwave Arduino Transmitter. This project is about a shortwave transmitter from 3 MHz to 30 MHz. It uses the SI5351 oscillator from Silicon Labs controlled by Arduino. Also, you can use it with a crystal oscillator. In this case, you will not need the SI5351 device and Arduino.
Android and iOS Bluetooth Remote Control for PU2CLR Arduino Library DSP receivers. This project is an extension of the Arduino library projects for: SI4735; AKC6959 and KT0915. It is a simple example that shows a way to use your smartphone as a remote control via Bluetooth. In order to follow the steps presented here, I am assuming that you have some knowledge in development for mobile devices. Also, you will need to be familiar with the Javascript programming language. The development environment used by this project is the Apache Cordova. Cordova is a open-source mobile development framework that allows you to develop cross-platform applications. That means you can code once and deploy the application in many system, including iOS and Android. Cordova provides an easy way to develop for iOS and Android.
Band Pass Filter controlled by Arduino. It is a HF band pass filter controlled by Arduino. It is designed for HF receivers. With this project, you can use a set of up to four HF bandpass filters that can be selected by Arduino. To do that you will need just two digital Arduino pins.

References

Videos about RDA5807 and this Arduino Library

Name		Name	Last commit message	Last commit date
Latest commit History 659 Commits
_includes		_includes
examples		examples
extras		extras
src		src
README.md		README.md
_config.yml		_config.yml
keywords.txt		keywords.txt
library.properties		library.properties
license.txt		license.txt

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FelixOON/RDA5807-2

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