Radio Modul
http://www.voti.nl/docs/TEA5767.pdf
Funktionen
Auto Search
1. search tuning request (direction und „search stop level“ können eingestellt werden)
2. „ready flag“ checken; wenn gesetzt ist entweder ein Sender mit dem eingestellten Pegel gefunden oder das Frequenzband-Ende erreicht
Flag SM (search mode)
PLL[13:8][0:7] Synthesizer Counter Preset
SUD Search Up/Down
SSL[1:0] Search Stop Level (low,mid,high)
POR
Power on reset
Mute wird gesetzt; alle anderen Einstellungen müssen an das Modul übertragen werden
https://github.com/andykarpov/TEA5767/tree/master/examples/SimpleRadioFM /* * TEA5767.h * defintions for TEA5767 FM radio module. * Created by Andrey Karpov * Based on this project: http://kalum.posterous.com/arduino-with-tea5767-single-chip-radio-and-no * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _TEA5767_H_ #define _TEA5767_H_ /****************************** * Write mode register values * ******************************/ /* First register */ #define TEA5767_MUTE 0x80 /* Mutes output */ #define TEA5767_SEARCH 0x40 /* Activates station search */ /* Bits 0-5 for divider MSB */ /* Second register */ /* Bits 0-7 for divider LSB */ /* Third register */ /* Station search from botton to up */ #define TEA5767_SEARCH_UP 0x80 /* Searches with ADC output = 10 */ #define TEA5767_SRCH_HIGH_LVL 0x60 /* Searches with ADC output = 10 */ #define TEA5767_SRCH_MID_LVL 0x40 /* Searches with ADC output = 5 */ #define TEA5767_SRCH_LOW_LVL 0x20 /* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */ #define TEA5767_HIGH_LO_INJECT 0x10 /* Disable stereo */ #define TEA5767_MONO 0x08 /* Disable right channel and turns to mono */ #define TEA5767_MUTE_RIGHT 0x04 /* Disable left channel and turns to mono */ #define TEA5767_MUTE_LEFT 0x02 #define TEA5767_PORT1_HIGH 0x01 /* Fourth register */ #define TEA5767_PORT2_HIGH 0x80 /* Chips stops working. Only I2C bus remains on */ #define TEA5767_STDBY 0x40 /* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */ #define TEA5767_JAPAN_BAND 0x20 /* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */ #define TEA5767_XTAL_32768 0x10 /* Cuts weak signals */ #define TEA5767_SOFT_MUTE 0x08 /* Activates high cut control */ #define TEA5767_HIGH_CUT_CTRL 0x04 /* Activates stereo noise control */ #define TEA5767_ST_NOISE_CTL 0x02 /* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */ #define TEA5767_SRCH_IND 0x01 /* Fifth register */ /* By activating, it will use Xtal at 13 MHz as reference for divider */ #define TEA5767_PLLREF_ENABLE 0x80 /* By activating, deemphasis=50, or else, deemphasis of 50us */ #define TEA5767_DEEMPH_75 0X40 /***************************** * Read mode register values * *****************************/ /* First register */ #define TEA5767_READY_FLAG_MASK 0x80 #define TEA5767_BAND_LIMIT_MASK 0X40 /* Bits 0-5 for divider MSB after search or preset */ /* Second register */ /* Bits 0-7 for divider LSB after search or preset */ /* Third register */ #define TEA5767_STEREO_MASK 0x80 #define TEA5767_IF_CNTR_MASK 0x7f /* Fourth register */ #define TEA5767_ADC_LEVEL_MASK 0xf0 /* should be 0 */ #define TEA5767_CHIP_ID_MASK 0x0f /* Fifth register */ /* Reserved for future extensions */ #define TEA5767_RESERVED_MASK 0xff /* internal constants */ #define TEA5767_SEARCH_DIR_UP 1 #define TEA5767_SEARCH_DIR_DOWN 2 #include <Arduino.h> struct tea5767_ctrl { unsigned int port1:1; unsigned int port2:1; unsigned int high_cut:1; unsigned int st_noise:1; unsigned int soft_mute:1; unsigned int japan_band:1; unsigned int deemph_75:1; unsigned int pllref:1; unsigned int xtal_freq; }; class TEA5767 { private: tea5767_ctrl ctrl_data; int HILO; protected: int hilo_optimal (unsigned long freq); void set_frequency (int hilo, double freq); int ready (unsigned char *buf); int bl_reached (unsigned char *buf); public: TEA5767(); TEA5767(double initial_freq); void set_frequency (double freq); int read_status (unsigned char *buf); int signal_level (unsigned char *buf); int stereo (unsigned char *buf); double frequency_available (unsigned char *buf); void search_up (unsigned char *buf); void search_down (unsigned char *buf); int process_search (unsigned char *buf, int search_dir); void init(); }; #endif // _TEA5767_H_ #include <stdio.h> #include <avr/pgmspace.h> #include <Arduino.h> #include <Wire.h> #include "TEA5767.h" TEA5767::TEA5767() { Wire.begin(); HILO = 1; } TEA5767::TEA5767(double initial_freq) { Wire.begin(); HILO = 1; set_frequency(initial_freq); } //calculate the optimial hi or lo injection mode for the freq is in hz //return 1 if high is the best, or 0 for low injection int TEA5767::hilo_optimal (unsigned long freq) { int signal_high = 0; int signal_low = 0; unsigned char buf[5]; set_frequency (1, (double) (freq + 450000) / 1000000); delay (30); // Read the signal level if (read_status (buf) == 1) { signal_high = signal_level (buf); } set_frequency (0, (double) (freq - 450000) / 1000000); delay (30); if (read_status (buf) == 1) { signal_low = signal_level (buf); } return (signal_high < signal_low) ? 1 : 0; } void TEA5767::set_frequency (int hilo, double freq) { unsigned char buffer[5]; unsigned div; int rc; memset (buffer, 0, 5); buffer[2] = 0; buffer[2] |= TEA5767_PORT1_HIGH; if (hilo == 1) buffer[2] |= TEA5767_HIGH_LO_INJECT; buffer[3] = 0; if (ctrl_data.port2) buffer[3] |= TEA5767_PORT2_HIGH; if (ctrl_data.high_cut) buffer[3] |= TEA5767_HIGH_CUT_CTRL; if (ctrl_data.st_noise) buffer[3] |= TEA5767_ST_NOISE_CTL; if (ctrl_data.soft_mute) buffer[3] |= TEA5767_SOFT_MUTE; if (ctrl_data.japan_band) buffer[3] |= TEA5767_JAPAN_BAND; buffer[3] |= TEA5767_XTAL_32768; buffer[4] = 0; if (ctrl_data.deemph_75) buffer[4] |= TEA5767_DEEMPH_75; if (ctrl_data.pllref) buffer[4] |= TEA5767_PLLREF_ENABLE; if (hilo == 1) div = (4 * (freq * 1000 + 225)) / 32.768; else div = (4 * (freq * 1000 - 225)) / 32.768; buffer[0] = (div >> 8) & 0x3f; buffer[1] = div & 0xff; Wire.beginTransmission (0x60); for (int i = 0; i < 5; i++) Wire.write (buffer[i]); Wire.endTransmission (); } /* Freq should be specifyed at X M hz */ void TEA5767::set_frequency (double freq) { HILO = hilo_optimal ((unsigned long) (freq * 1000000)); set_frequency (HILO, freq); } //read functions int TEA5767::read_status (unsigned char *buf) { memset (buf, 0, 5); Wire.requestFrom (0x60, 5); //reading TEA5767 if (Wire.available ()) { for (int i = 0; i < 5; i++) { buf[i] = Wire.read (); } return 1; } else { return 0; } } int TEA5767::signal_level (unsigned char *buf) { int signal = ((buf[3] & TEA5767_ADC_LEVEL_MASK) >> 4); return signal; } int TEA5767::stereo (unsigned char *buf) { int stereo = (buf[2] & TEA5767_STEREO_MASK); return stereo ? 1 : 0; } //returns 1 if tuning completed or BL reached int TEA5767::ready (unsigned char *buf) { return (buf[0] & 0x80) ? 1 : 0; } //returns 1 if band limit is reached during searching int TEA5767::bl_reached (unsigned char *buf) { return (buf[0] & 0x40) ? 1 : 0; } //returns freq available in Hz double TEA5767::frequency_available (unsigned char *buf) { double freq_available; if (HILO == 1) freq_available = (((buf[0] & 0x3F) << 8) + buf[1]) * 32768 / 4 - 225000; else freq_available = (((buf[0] & 0x3F) << 8) + buf[1]) * 32768 / 4 + 225000; return freq_available; } void TEA5767::search_up (unsigned char *buf) { unsigned div; double freq_av; freq_av = frequency_available (buf); div = (4 * (((freq_av + 98304) / 1000000) * 1000000 + 225000)) / 32768; buf[0] = (div >> 8) & 0x3f; buf[1] = div & 0xff; buf[0] |= TEA5767_SEARCH; buf[2] = 0; buf[2] |= TEA5767_SEARCH_UP; buf[2] |= TEA5767_SRCH_MID_LVL; buf[2] |= TEA5767_HIGH_LO_INJECT; //buf[3] = 0x18; buf[3] = 0; if (ctrl_data.port2) buf[3] |= TEA5767_PORT2_HIGH; if (ctrl_data.high_cut) buf[3] |= TEA5767_HIGH_CUT_CTRL; if (ctrl_data.st_noise) buf[3] |= TEA5767_ST_NOISE_CTL; if (ctrl_data.soft_mute) buf[3] |= TEA5767_SOFT_MUTE; if (ctrl_data.japan_band) buf[3] |= TEA5767_JAPAN_BAND; buf[3] |= TEA5767_XTAL_32768; buf[4] = 0; if (ctrl_data.deemph_75) buf[4] |= TEA5767_DEEMPH_75; if (ctrl_data.pllref) buf[4] |= TEA5767_PLLREF_ENABLE; Wire.beginTransmission (0x60); for (int i = 0; i < 5; i++) Wire.write (buf[i]); Wire.endTransmission (); HILO = 1; } void TEA5767::search_down (unsigned char *buf) { unsigned div; double freq_av; freq_av = frequency_available (buf); div = (4 * (((freq_av - 98304) / 1000000) * 1000000 + 225000)) / 32768; buf[0] = (div >> 8) & 0x3f; buf[1] = div & 0xff; buf[0] |= TEA5767_SEARCH; buf[2] = 0; buf[2] |= TEA5767_SRCH_MID_LVL; buf[2] |= TEA5767_HIGH_LO_INJECT; buf[3] = 0; if (ctrl_data.port2) buf[3] |= TEA5767_PORT2_HIGH; if (ctrl_data.high_cut) buf[3] |= TEA5767_HIGH_CUT_CTRL; if (ctrl_data.st_noise) buf[3] |= TEA5767_ST_NOISE_CTL; if (ctrl_data.soft_mute) buf[3] |= TEA5767_SOFT_MUTE; if (ctrl_data.japan_band) buf[3] |= TEA5767_JAPAN_BAND; buf[3] |= TEA5767_XTAL_32768; buf[4] = 0; if (ctrl_data.deemph_75) buf[4] |= TEA5767_DEEMPH_75; if (ctrl_data.pllref) buf[4] |= TEA5767_PLLREF_ENABLE; Wire.beginTransmission (0x60); for (int i = 0; i < 5; i++) Wire.write (buf[i]); Wire.endTransmission (); HILO = 1; } //Returns 1 if search is finished, 0 if wrapped and new search initiated //TODO - To prevent endless looping add a static variable to abort if it has searched for more than 2 loops int TEA5767::process_search (unsigned char *buf, int search_dir) { if (ready (buf) == 1) { if (bl_reached (buf) == 1) { if (search_dir == TEA5767_SEARCH_DIR_UP) { //wrap down set_frequency (87.5); read_status (buf); search_up (buf); return 0; } else if (search_dir == TEA5767_SEARCH_DIR_DOWN) { //wrap up set_frequency (108); read_status (buf); search_down (buf); return 0; } } else { // search finished - round up the pll word and feed it back as recommended double rounded_freq; double freq_available = frequency_available (buf); rounded_freq = floor (freq_available / 100000 + .5) / 10; set_frequency (rounded_freq); return 1; } } } void TEA5767::init() { ctrl_data.port1 = 1; ctrl_data.port2 = 1; ctrl_data.high_cut = 1; ctrl_data.st_noise = 1; ctrl_data.soft_mute = 1; ctrl_data.deemph_75 = 0; ctrl_data.japan_band = 0; ctrl_data.pllref = 0; // unsigned long freq = 87500000; // set_frequency((float) freq / 1000000); }
Beispiel
#include <TEA5767.h>
#include <Wire.h>
#include <Button.h>
#include <LiquidCrystal.h>
TEA5767 Radio;
LiquidCrystal lcd(12,11,10,9,8,7);
double old_frequency;
double frequency;
int search_mode = 0;
int search_direction;
unsigned long last_pressed;
Button btn_forward(3, PULLUP);
Button btn_backward(2, PULLUP);
void setup() {
Wire.begin();
Radio.init();
Radio.set_frequency(105.4);
Serial.begin(9600);
lcd.begin(16,2);
lcd.clear();
}
void loop() {
unsigned char buf[5];
int stereo;
int signal_level;
double current_freq;
unsigned long current_millis = millis();
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);
lcd.setCursor(0,0);
lcd.print("FM: "); lcd.print(current_freq);
lcd.setCursor(0,1);
if (stereo) lcd.print("STEREO "); else lcd.print("MONO ");
//lcd.print(signal_level);
}
if (search_mode == 1) {
if (Radio.process_search (buf, search_direction) == 1) {
search_mode = 0;
}
}
if (btn_forward.isPressed()) {
last_pressed = current_millis;
search_mode = 1;
search_direction = TEA5767_SEARCH_DIR_UP;
Radio.search_up(buf);
delay(300);
}
if (btn_backward.isPressed()) {
last_pressed = current_millis;
search_mode = 1;
search_direction = TEA5767_SEARCH_DIR_DOWN;
Radio.search_down(buf);
delay(300);
}
//delay(20);
delay(50);
}