Functions
void	RDA5807::setFrequencyToBeginBand ()
	Tunes the receiver at the first channel/frequency of the current band.

void	RDA5807::setFrequencyToEndBand ()
	Tunes the receiver at the last channel/frequency of the current band.

uint16_t	RDA5807::getMaximunFrequencyOfTheBand ()
	gets the maximun frequency of the current band

uint16_t	RDA5807::getMinimumFrequencyOfTheBand ()
	gets the minimum frequency of the current band

uint8_t	RDA5807::getBand ()
	Returns the current band.

uint8_t	RDA5807::getSpace ()
	Returns the current Band Space.

bool	RDA5807::isFmTrue ()
	Returns true if the current channel is a station.

bool	RDA5807::isFmReady ()
	Returns true if the FM is ready.

void	RDA5807::setSoftBlendEnable (bool value)
	Sets Soft Blend.

void	RDA5807::setAFC (bool value)
	Sets AFC true or false.

void	RDA5807::setChannel (uint16_t channel)
	Sets the channel.

void	RDA5807::setFrequency (uint16_t frequency)
	Sets the frequency.

void	RDA5807::setDirectFrequency (uint16_t frequency)
	Sets the frequency using the reg08 (direct frequency)

void	RDA5807::setFrequencyMode (uint8_t value)
	Sets the frequency mode. If 1, then freq setting changed.

void	RDA5807::setFrequencyUp ()
	Increments the current frequency.

void	RDA5807::setFrequencyDown ()
	Decrements the current frequency.

uint16_t	RDA5807::getFrequency ()
	Gets the current frequency.

uint16_t	RDA5807::getRealChannel ()
	Gets the current channel stored in 0x0A status register.

uint16_t	RDA5807::getRealFrequency ()
	Gets the current frequency bases on the current channel.

void	RDA5807::seek (uint8_t seek_mode, uint8_t direction)
	Seek function.

void	RDA5807::seek (uint8_t seek_mode, uint8_t direction, void(*showFunc)())
	Seek function.

void	RDA5807::setSeekThreshold (uint8_t value)
	Sets RSSI Seek Threshold.

void	RDA5807::setBand (uint8_t band=0)
	Sets the FM band. See table below.

void	RDA5807::setBand3_50_65_Mode (uint8_t band3Mode)
	Sets the band 3 mode: 50 to 65 MHZ or 65 to 76 MHz.

uint8_t	RDA5807::getBand3Status ()
	Gets the status of the Band3.

void	RDA5807::setSpace (uint8_t space=0)
	Sets the FM channel space.

void	RDA5807::setStep (uint8_t step=100)
	Sets the FM Step;.

void	RDA5807::setFmDeemphasis (uint8_t de)
	Sets De-emphasis.

Detailed Description

FM Tune

Function Documentation

◆ getBand()

uint8_t RDA5807::getBand ( )

inline

Returns the current band.

See also: FM Band table

Returns: uint8_t

◆ getBand3Status()

uint8_t RDA5807::getBand3Status ( )

Gets the status of the Band3.

Gets the status of the Band3

Returns: 1 if setup is 65 to 76 MHz; 0 if setup is 50 to 65 MHz

◆ getFrequency()

uint16_t RDA5807::getFrequency ( )

Gets the current frequency.

Returns: uint16_t

◆ getMaximunFrequencyOfTheBand()

uint16_t RDA5807::getMaximunFrequencyOfTheBand ( )

inline

gets the maximun frequency of the current band

Returns: the last valid frequency of the current band

See also: setFrequency, getFrequency, setFrequencyToBeginBand, setFrequencyToEndBand, getRealFrequency, getMaximunFrequencyOfTheBand, getMinimumFrequencyOfTheBand

◆ getMinimumFrequencyOfTheBand()

uint16_t RDA5807::getMinimumFrequencyOfTheBand ( )

inline

gets the minimum frequency of the current band

Returns: the first valid frequency of the current band

See also: setFrequency, getFrequency, setFrequencyToBeginBand, setFrequencyToEndBand, getRealFrequency, getMaximunFrequencyOfTheBand, getMinimumFrequencyOfTheBand

◆ getRealChannel()

uint16_t RDA5807::getRealChannel ( )

Gets the current channel stored in 0x0A status register.

See also: setChannel, setFrequency, setBand, setSpace; RDA5807M - SINGLE-CHIP BROADCAST FM RADIO TUNER - Rev.1.1–Aug.2015; pages 9 and 12.

Returns: uint16_t current channel value

◆ getRealFrequency()

uint16_t RDA5807::getRealFrequency ( )

Gets the current frequency bases on the current channel.

The current channel is stored in the 0x0A register. This value is updated after a tune or seek operation.

The current frequency can be calculated by the formula below

Band	Formula
0	Frequency = Channel Spacing (kHz) x READCHAN[9:0]+ 87.0 MHz
1 or 2	Frequency = Channel Spacing (kHz) x READCHAN[9:0]+ 76.0 MHz
3	Frequency = Channel Spacing (kHz) x READCHAN[9:0]+ 65.0 MHz

See also: setChannel, setFrequency, setBand, setSpace; RDA5807M - SINGLE-CHIP BROADCAST FM RADIO TUNER - Rev.1.1–Aug.2015; pages 9 and 12.

Returns: uint16_t

◆ getSpace()

uint8_t RDA5807::getSpace ( )

inline

Returns the current Band Space.

Returns: uint8_t value (0 = 100kHz, 1 = 200kHz, 2 = 50kHz e 3 = 25kHz)

◆ isFmReady()

bool RDA5807::isFmReady ( )

inline

Returns true if the FM is ready.

Returns: true or false

◆ isFmTrue()

bool RDA5807::isFmTrue ( )

inline

Returns true if the current channel is a station.

Returns: true or false

◆ seek() [1/2]

void RDA5807::seek	(	uint8_t	seek_mode,
		uint8_t	direction
	)

Seek function.

look for next or previous station available. Example:

#include <RDA5807.h> 
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 at 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);
}

Parameters

seek_mode	if 0, wrap at the upper or lower band limit and continue seeking; 1 = stop seeking at the upper or lower band limit
direction	if 0, seek down; if 1, seek up.

◆ seek() [2/2]

void RDA5807::seek	(	uint8_t	seek_mode,
		uint8_t	direction,
		void(*)()	showFunc
	)

Seek function.

Seeks a station up or down.

Seek up or down a station and call a function defined by the user to show the frequency during the seek process.

Seek begins at the current channel, and goes in the direction specified with the SEEKUP bit. Seek operation stops when a channel is qualified as valid according to the seek parameters, the entire band has been searched (SKMODE = 0), or the upper or lower band limit has been reached (SKMODE = 1).

The STC bit is set high when the seek operation completes and/or the SF/BL bit is set high if the seek operation was unable to find a channel qualified as valid according to the seek parameters. The STC and SF/BL bits must be set low by setting the SEEK bit low before the next seek or tune may begin.

The SEEK bit is set low and the STC bit is set high when the seek operation completes.

It is important to say you have to implement a show frequency function. This function have to get the frequency via getFrequency function.

Example:

SI470X rx;
 
void showFrequency() {
   uint16_t freq = rx.getFrequency();
   Serial.print(freq);
   Serial.println("MHz ");
}
 
void loop() {
 .
 .
     rx.seek(RDA_SEEK_WRAP, RDA_SEEK_UP, showFrequency); // Seek Up
 .
 .
}

Parameters

seek_mode	Seek Mode; 0 = Wrap at the upper or lower band limit and continue seeking (default); 1 = Stop seeking at the upper or lower band limit.
direction	Seek Direction; 0 = Seek down (default); 1 = Seek up.
showFunc	function that you have to implement to show the frequency during the seeking process. Set NULL if you do not want to show the progress.

References RDA5807::waitAndFinishTune().

◆ setAFC()

void RDA5807::setAFC ( bool value )

Sets AFC true or false.

Parameters

value true or false

◆ setBand()

void RDA5807::setBand ( uint8_t band = 0 )

Sets the FM band. See table below.

FM band table

Value	Decimal	Description
00	0	87–108 MHz (US/Europe)
01	1	76–91 MHz (Japan)
10	2	76–108 MHz (world wide)
11	3	65 –76 MHz (East Europe) or 50-65MHz (see bit 9 of gegister 0x07)

if you are using the band 3 with 50 to 65 MHz setup, the setFrequencyUp, setFrequencyDown, setFrequencyToBeginBand and setFrequencyToEndBand

will not work properly. In this case, you have control the limits of the band by yourself.

#include <RDA5807.h>
RDA5807 rx;
void setup() {
  rx.setup();
  rx.setBand(2); // Sets band: 76–108 MHz (world wide)  
  rx.setFrequency(10390); // Tunes at 103.9 MHz
}
void loop() {
}

Parameters

band	FM band index. See table above.

See also: setBand3_50_65_Mode, getBand3Status

◆ setBand3_50_65_Mode()

void RDA5807::setBand3_50_65_Mode ( uint8_t band3Mode )

Sets the band 3 mode: 50 to 65 MHZ or 65 to 76 MHz.

It works only for Band 3. So if you are on band 3 (default 65 – 76 MHz East Europe) you can change the range to 50-65MHz.

ATTENTION: The functions setFrequencyToBeginBand and setFrequencyToEnBand do not work for 50-65MHz setup. You have to control it by yourself.

ATTENTION: Also, you must control the band limits from 50 to 65 MHz. The setFrequencyUp and setFrequencyDown do not work properly.

Parameters

band3Mode if 1, 65 – 76 MHz; if 0, 50-65MHz

◆ setChannel()

void RDA5807::setChannel ( uint16_t channel )

Sets the channel.

This method tunes the rteceiver in a given channel.

The channel can be calculated by using the follow formula

channel = (desired frequency - start band frequency) / space channel in use / 10.0);

See also: setFrequency, setBand, setSpace; RDA5807M - SINGLE-CHIP BROADCAST FM RADIO TUNER - Rev.1.1–Aug.2015; pages 9 and 12.

Parameters

channel

References RDA5807::waitAndFinishTune().

◆ setDirectFrequency()

void RDA5807::setDirectFrequency ( uint16_t frequency )

Sets the frequency using the reg08 (direct frequency)

valid when frequency mode is 1

Parameters

frequency

◆ setFmDeemphasis()

void RDA5807::setFmDeemphasis ( uint8_t de )

Sets De-emphasis.

Default is 75 μs (used in USA); 50 μs is used in Europe, Australia, Japan.

#include <RDA5807.h>
RDA5807 rx;
void setup() {
 rx.setup();
 rx.setFrequency(10390); // Tunes at 103.9 MHz
 rx.setFmDeemphasis(1); // Sets to 50 μs. Used in Europe, Australia, Japan.
}
void loop() {
}

Parameters

de	0 = 75 μs; 1 = 50 μs

◆ setFrequency()

void RDA5807::setFrequency ( uint16_t frequency )

Sets the frequency.

Tunes the receiver at a given frequency. Example:

#include <RDA5807.h> 
RDA5807 rx; 
void setup() {
 pinMode(4, INPUT_PULLUP); // Arduino pin 4 - Frequency Up
 pinMode(5, INPUT_PULLUP); // Arduino pin 5 - Frequency Down
 rx.setup(); 
 rx.setFrequency(10390); // Tunes at 103.9 MHz 
}
void loop() {
 if (digitalRead(4) == LOW) rx.setFrequencyUp();
 if (digitalRead(5) == LOW) rx.setFrequencyDown();
 delay(200);
}

Parameters

frequency - an integer with the frequency value (Example: 7600=76MHz, 10790 = 107,90MHz)

See also: setFrequencyUp, setFrequencyDown, getFrequency

◆ setFrequencyDown()

void RDA5807::setFrequencyDown ( )

Decrements the current frequency.

The drecrement uses the band space as step. See array: uint16_t fmSpace[4] = {20, 10, 5, 1};

◆ setFrequencyMode()

void RDA5807::setFrequencyMode ( uint8_t value )

Sets the frequency mode. If 1, then freq setting changed.

Parameters

value ( default = 0 or 1)

◆ setFrequencyToBeginBand()

void RDA5807::setFrequencyToBeginBand ( )

inline

Tunes the receiver at the first channel/frequency of the current band.

If the current band is 0, the lowest frequency is 87Mhz (8700)

See also: setFrequency, getFrequency, setFrequencyToEndBand, getRealFrequency, getMaximunFrequencyOfTheBand, getMinimumFrequencyOfTheBand

◆ setFrequencyToEndBand()

void RDA5807::setFrequencyToEndBand ( )

inline

Tunes the receiver at the last channel/frequency of the current band.

If the current band is 0, the highest frequency is 108MHz (10800)

See also: setFrequency, getFrequency, setFrequencyToBeginBand, getRealFrequency, getMaximunFrequencyOfTheBand, getMinimumFrequencyOfTheBand

◆ setFrequencyUp()

void RDA5807::setFrequencyUp ( )

Increments the current frequency.

The increment uses the band space as step. See array: uint16_t fmSpace[4] = {100/10, 200/10, 50/10, 25/10};

#include <RDA5807.h> 
RDA5807 rx; 
void setup() {
 pinMode(4, INPUT_PULLUP); // Arduino pin 4 - Frequency Up
 pinMode(5, INPUT_PULLUP); // Arduino pin 5 - Frequency Down
 rx.setup(); 
 rx.setFrequency(10390); // Tunes at 103.9 MHz 
}
void loop() {
 if (digitalRead(4) == LOW) rx.setFrequencyUp();
 if (digitalRead(5) == LOW) rx.setFrequencyDown();
 delay(200);
}

See also: setFrequency, getFrequency

◆ setSeekThreshold()

void RDA5807::setSeekThreshold ( uint8_t value )

Sets RSSI Seek Threshold.

Parameters

value

◆ setSoftBlendEnable()

void RDA5807::setSoftBlendEnable ( bool value )

Sets Soft Blend.

Parameters

value true or false

◆ setSpace()

void RDA5807::setSpace ( uint8_t space = 0 )

Sets the FM channel space.

You can define the frequency step in kHz (see table below)

Channel space table

Value	Decimal	Description
00	0	100KHz
01	1	200KHz
10	2	50KHz
11	3	25KHz

#include <RDA5807.h>
RDA5807 rx;
void setup() {
 pinMode(4, INPUT_PULLUP); // Arduino pin 4 - Frequency Up
 pinMode(5, INPUT_PULLUP); // Arduino pin 5 - Frequency Down
 rx.setup();
 rx.setBandSpace(2); // 50 kHz Step
 rx.setFrequency(10390); // Tunes at 103.9 MHz
}
void loop() {
 if (digitalRead(4) == LOW) rx.setFrequencyUp();   // Up 50 kHz
 if (digitalRead(5) == LOW) rx.setFrequencyDown(); // Down 50 kHz
 delay(200);
}

Parameters

space FM channel space. See table above.

Todo:: make the space 01 (200kHz) work.

See also: setStep

◆ setStep()

void RDA5807::setStep ( uint8_t step = 100 )

Sets the FM Step;.

Converts the step frequency (25, 50, 100 or 200 kHz) to Space. Invalid values will be converted to 0 (100 kHz)
Parameters

step 25, 50, 100 or 200 kHz

Todo:
Make the step 200kHz work well

Functions

Detailed Description

FM Tune

Function Documentation

◆ getBand()

◆ getBand3Status()

◆ getFrequency()

◆ getMaximunFrequencyOfTheBand()

◆ getMinimumFrequencyOfTheBand()

◆ getRealChannel()

◆ getRealFrequency()

◆ getSpace()

◆ isFmReady()

◆ isFmTrue()

◆ seek() [1/2]

◆ seek() [2/2]

◆ setAFC()

◆ setBand()

◆ setBand3_50_65_Mode()

◆ setChannel()

◆ setDirectFrequency()

◆ setFmDeemphasis()

◆ setFrequency()

◆ setFrequencyDown()

◆ setFrequencyMode()

◆ setFrequencyToBeginBand()

◆ setFrequencyToEndBand()

◆ setFrequencyUp()

◆ setSeekThreshold()

◆ setSoftBlendEnable()

◆ setSpace()

◆ setStep()