Bluetooth FM Radio

TEA5767 + Arduino Nano + HC-06

Because I did not create a radio control application, I used a common Bluetooth terminal program to control the radio. And, I have a plan to create an Android Bluetooth control app and support a real frequency controller connected to the device with a display window.

	#include <SoftwareSerial.h>
	#include <TEA5767.h>
	#include <Wire.h>
	#include <ctype.h>
	SoftwareSerial BT(9, 8);
	TEA5767 Radio; //Pinout SCL and SDA - Arduino pins A5 and A4
	double old_frequency;
	double frequency;
	int search_mode = 0;
	int search_direction;
	unsigned char buf[5];
	int stereo;
	int signal_level;
	double current_freq;
	char buffer[256];
	int index = 0;
	void setup()
	{
	// Uncomment following statements to change the bluetooth device name
	/*
	Serial.begin(9600);
	BT.begin(9600);
	delay(500);
	BT.print("AT+NAMEFocalRadio 1");
	delay(200);
	return;
	*/
	Serial.begin(9600);
	BT.begin(9600);
	BT.println("FocalRadio 1");
	Serial.println("FocalRadio 1");
	Wire.begin();
	Radio.init();
	Radio.set_frequency(104.5);
	}
	void loop()
	{
	index = 0;
	buffer[0] = NULL;
	while (BT.available())
	{
	char ch = BT.read();
	buffer[index++] = ch;
	if (index == 256 || ch == '\0')
	break;
	}
	if (index > 0)
	{
	buffer[index] = NULL;
	//Serial.println(buffer);
	}
	else
	{
	delay(50);
	return;
	}
	if (search_mode == 1)
	{
	if (Radio.process_search(buf, search_direction) == 1)
	{
	search_mode = 0;
	getCurrentInfo();
	}
	}
	if (String(buffer).equals("s"))
	{
	getCurrentInfo();
	}
	else if (String(buffer).equals("u"))
	{
	BT.println("Search up...");
	search_mode = 1;
	search_direction = TEA5767_SEARCH_DIR_UP;
	Radio.search_up(buf);
	delay(100);
	}
	else if (String(buffer).equals("d"))
	{
	BT.println("Search down...");
	search_mode = 1;
	search_direction = TEA5767_SEARCH_DIR_DOWN;
	Radio.search_down(buf);
	delay(100);
	}
	else if (isdigit(buffer[0]) && !isalpha(buffer))
	{
	float freq = String(buffer).toFloat();
	if (76.0 <= freq && freq <= 108.0)
	{
	BT.print("Freq: ");
	BT.println(freq);
	Radio.set_frequency(freq);
	}
	}
	delay(50);
	}
	void getCurrentInfo()
	{
	if (Radio.read_status(buf) == 1)
	{
	current_freq = floor(Radio.frequency_available (buf) / 100000 + .5) / 10;
	stereo = Radio.stereo(buf);
	signal_level = Radio.signal_level(buf);
	BT.print(current_freq);
	if (stereo)
	BT.print(" STEREO ");
	else
	BT.print(" MONO ");
	BT.print(signal_level);
	BT.println("/15");
	}
	}

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