Fm приемник на rda5807m своими руками

#include <Wire.h>

    /* Select the frequency we want to tune to by way

     * of selecting the channel for the desired frequency

     */

uint16_t channel = 187;

    /*

     * предполагаем что диапазон начинается с частоты 87.0MHz (для приведенных ниже настроек)

     * расстояние между каналами составляет 100kHz (0.1MHz) (per settings below)

     * тогда номер канала можно вычислить с помощью следующего выражения:

     *  

     * channel = (<desired freq in MHz> — 87.0) / 0.1

     *

     * или можно записать это выражение в другом виде:

     * <10 x desired freq in MHz> — 870

     */

#define RDA5807M_ADDRESS  0b0010000 // 0x10

#define BOOT_CONFIG_LEN 12

#define TUNE_CONFIG_LEN 4

/*

*  Эти байты устанавливают нашу первоначальную конфигурацию

*  На этом этапе мы не беспокоимся о настройке приемника на нужный канал.

*  Здесь мы производим сброс модуля.

*/

uint8_t boot_config[] = {

  /* register 0x02 */

  0b11000001,

    /*

     * DHIZ audio output high-z disable

     * 1 = normal operation

     *

     * DMUTE mute disable

     * 1 = normal operation

     *

     * MONO mono select

     * 0 = stereo

     *

     * BASS bass boost

     * 0 = disabled

     *

     * RCLK NON-CALIBRATE MODE

     * 0 = RCLK is always supplied

     *

     * RCLK DIRECT INPUT MODE

     * 0 = ??? not certain what this does

     *

     * SEEKUP

     * 0 = seek in down direction

     *

     * SEEK

     * 0 = disable / stop seek (i.e. don’t seek)

     */

  0b00000011,

    /*

     * SKMODE seek mode:

     * 0 = wrap at upper or lower band limit and contiue seeking

     *

     * CLK_MODE clock mode

     *  000 = 32.768kHZ clock rate (match the watch cystal on the module)

     *

     * RDS_EN radio data system enable

     * 0 = disable radio data system

     *

     * NEW_METHOD use new demodulate method for improved sensitivity

     * 0 = presumably disabled

     *

     * SOFT_RESET

     * 1 = perform a reset

     *

     * ENABLE power up enable:

     * 1 = enabled

     */

  /* register 0x03 */

    /* Don’t bother to tune to a channel at this stage*/

  0b00000000,

    /*

     * CHAN channel select 8 most significant bits of 10 in total

     * 0000 0000 = don’t boher to program a channel at this time

     */

  0b00000000,

    /*

     * CHAN two least significant bits of 10 in total

     * 00 = don’t bother to program a channel at this time

     *

     * DIRECT MODE used only when test

     * 0 = presumably disabled

     *

     * TUNE commence tune operation

     * 0 = disable (i.e. don’t tune to selected channel)

     *

     * BAND band select

     * 00 = select the 87-108MHz band

     *

     * SPACE channel spacing

     * 00 = select spacing of 100kHz between channels

     */    

  /* register 0x04 */

  0b00001010,

    /*

     * RESERVED 15

     * 0

     *

     * PRESUMABLY RESERVED 14

     * 0

     *

     * RESERVED 13:12

     * 00

     *

     * DE de-emphasis:

     * 1 = 50us de-emphasis as used in Australia

     *

     * RESERVED

     * 0

     *

     * SOFTMUTE_EN

     * 1 = soft mute enabled

     *

     * AFCD AFC disable

     * 0 = AFC enabled

     */

  0b00000000,

    /*

     *  Bits 7-0 are not specified, so assume all 0’s

     * 0000 0000

     */  

  /* register 0x05 */

  0b10001000,

    /*

     * INT_MODE

     * 1 = interrupt last until read reg 0x0C

     *

     * RESERVED 14:12

     * 000

     *

     * SEEKTH seek signal to noise ratio threshold

     * 1000 = suggested default

     */  

  0b00001111,

    /*

     * PRESUMABLY RESERVED 7:6

     * 00

     *

     * RESERVED 5:4

     * 00

     *

     * VOLUME

     * 1111 = loudest volume

     */

  /* register 0x06 */

  0b00000000,

    /*

     * RESERVED 15

     * 0

     *

     * OPEN_MODE open reserved registers mode

     * 00 = suggested default

     *

     * Bits 12:8 are not specified, so assume all 0’s

     * 00000

     */  

  0b00000000,

    /*

     *  Bits 7:0 are not specified, so assume all 0’s

     *  00000000

     */    

  /* register 0x07 */

  0b01000010,

    /*

     *  RESERVED 15

     * 0

     *

     * TH_SOFRBLEND threshhold for noise soft blend setting

     * 10000 = using default value

     *

     * 65M_50M MODE

     * 1 = only applies to BAND setting of 0b11, so could probably use 0 here too

     *

     * RESERVED 8

     * 0

     */      

  0b00000010,

    /*  

     *  SEEK_TH_OLD seek threshold for old seek mode

     * 000000

     *

     * SOFTBLEND_EN soft blend enable

     * 1 = using default value

     *

     * FREQ_MODE

     * 0 = используем значение по умолчанию

     */  

};

/* After reset, we can tune the device

* We only need program the first 4 bytes in order to do this

*/

uint8_t tune_config[] = {

  /* register 0x02 */

  0b11000000,

    /*

     * DHIZ audio output high-z disable

     * 1 = normal operation

     *

     * DMUTE mute disable

     * 1 = normal operation

     *

     * MONO mono select

     * 0 = mono

     *

     * BASS bass boost

     * 0 = disabled

     *

     * RCLK NON-CALIBRATE MODE

     * 0 = RCLK is always supplied

     *

     * RCLK DIRECT INPUT MODE

     * 0 = ??? not certain what this does

     *

     * SEEKUP

     * 0 = seek in down direction

     *

     * SEEK

     * 0 = disable / stop seek (i.e. don’t seek)

     */  

   0b00000001,

    /*

     * SKMODE seek mode:

     * 0 = wrap at upper or lower band limit and contiue seeking

     *

     * CLK_MODE clock mode

     * 000 = 32.768kHZ clock rate (match the watch cystal on the module)

     *

     * RDS_EN radio data system enable

     * 0 = disable radio data system

     *

     * NEW_METHOD use new demodulate method for improved sensitivity

     * 0 = presumably disabled

     *

     * SOFT_RESET

     * 0 = don’t reset this time around

     *

     * ENABLE power up enable:

     * 1 = enabled

     */

   /* register 0x03 */

   /* Here’s where we set the frequency we want to tune to */

   (channel >> 2),

    /* CHAN channel select 8 most significant bits of 10 in total   */

   ((channel & 0b11) << 6 ) | 0b00010000

    /*

     *  CHAN two least significant bits of 10 in total

     *

     * DIRECT MODE used only when test

     * 0 = presumably disabled

     *

     * TUNE commence tune operation

     * 1 = enable (i.e. tune to selected channel)

     *

     * BAND band select

     * 00 = select the 87-108MHz band

     *

     * SPACE channel spacing

     * 00 = select spacing of 100kHz between channels

     */  

};

void setup()

{

  Serial.begin(9600);

  pinMode(A0,INPUT);

  Wire.begin();

  Wire.beginTransmission(RDA5807M_ADDRESS);

  Wire.write(boot_config, BOOT_CONFIG_LEN);

  Wire.endTransmission();

  Wire.beginTransmission(RDA5807M_ADDRESS);

  Wire.write(tune_config, TUNE_CONFIG_LEN);

  Wire.endTransmission();

}//setup end

void loop()

{

  int channel1 =90,newA;

  static int oldA = 0; // set the oldA as HIGH

  int result = 0;

  newA = analogRead(A0);

  if ((newA — oldA) > 10 || (oldA — newA) > 10){

    Serial.println(newA);

    if(newA!= oldA){

      channel = channel1+(newA/10);

      myChangeChannel(channel);

      oldA=newA;

      }

}

  uint16_t frequency = channel+870;

  uint16_t num1 = (frequency / 1000) % 10;

  uint16_t num2 = (frequency / 100) % 10;

  uint16_t num3 = (frequency / 10) % 10;

  uint16_t num4 = frequency % 10;

  Serial.print(num1);

  Serial.print(num2);

  Serial.print(num3);

  Serial.print(num4);

  Serial.print(«—«);

  Serial.println(channel+870);

}//конец цикла loop

/*

* функция для изменения канала в модуле RDA5807

* Example: channel = 191

*/

void myChangeChannel(int channel){ /* void if nothing is returned else int */

  /*

   * первым делом записываем новый канал в массив tune_config, потом передаем его значение модулю RDA5807

   */

   tune_config[2] = (channel >> 2);

   tune_config[3] = ((channel & 0b11) << 6 ) | 0b00010000;

      Wire.begin();

      Wire.beginTransmission(RDA5807M_ADDRESS);

      Wire.write(tune_config, TUNE_CONFIG_LEN);

      Wire.endTransmission();

  }