www.kn34pc.com

REG_02, 6:4 CLK_MODE[2:0]
000 = 32.768 kHz
001 = 12 MHz
101 = 24 MHz
010 = 13 MHz
110 = 26 MHz
011 = 19.2 MHz
111 = 38.4 MHz

#include <main.h>
#include <stdint.h>

uint16_t f = 1033;                 // Horizont, Silistra, 103.3 MHz

void main() { 
  delay_ms(600);
 
  i2c_start();
  i2c_write(0x11 << 1);            // RDA5807 mode, random access
  i2c_write(0x02);                 // reg 02
  i2c_write(0b11000000);           // mute off, bass boost off
  i2c_write(0b00001101);           // FCLK 32768 Hz, RDS disabled, power on
  i2c_stop();

  delay_ms(50);

  f -= 870;
  f <<= 6;
  f |= 0b0000000000010000;         // reg 03: SPACE[1:0], BAND[1:0], TUNE enable
 
  i2c_start();
  i2c_write(0x11 << 1);
  i2c_write(0x03);                 // reg 03
  i2c_write(make8(f, 1));          // MSB bits
  i2c_write(make8(f, 0));          // LSB bits
  i2c_stop();

  while(TRUE) {
  }
}