/**
  @file    fmrx_demo.ino
  @author  www.elechouse.com
  @brief   example of FMRX_MODULE
  
    For this demo, input character '1' from serial monitor to seek channel down, '2' to seek down
 '3' to volume up, '4' to volume down.'&xxxx' (x is for a number) to manually set receive FM frequency
  
  @section  HISTORY
  
  V1.0 initial version
  
    Copyright (c) 2012 www.elechouse.com  All right reserved.
*/

/** include library */
#include <FMRX.h>
float channel;
void setup(void)
{
  Serial.begin(9600);
  Serial.print("FM-RX Demo By Elechosue\r\n");
  
  /** I2C initial */
  i2c_init();
  
  fmrx_power();
  fmrx_read_reg(fmrx_reg_r);
  Serial.print("FMRX Module Power up.\r\n");

  /** set volume */
  fmrx_set_volume(10);
  Serial.println("Volume Set");
  
  /** receive signal strength set, range:0-127*/
  fmrx_set_rssi(15);
  
  /** 
    select a band, parameter:
    BAND_EU:       87-108MHz, Europe
    BAND_US:       87-108MHz, USA
    BAND_JP:       76-91MHz, JAPAN
    BAND_JP_WIDE:  76-108MHz, JAPAN wide
  */
  fmrx_select_band(BAND_US);
  
  channel=fmrx_seek(SEEK_DOWN);
  Serial.println("Initial seek.");
  Serial.print("Channel:");
  Serial.print(channel, 2);
  Serial.println("MHz");
}

void loop(void)
{
  static u8 vol=10;
  if(Serial.available()>0){
    switch(Serial.read()){
      case '1':
        Serial.println("Wait...");
        channel = fmrx_seek(SEEK_DOWN);
        Serial.println("Seek down.");
        Serial.print("Channel:");
        Serial.print(channel, 2);
        Serial.println("MHz");
        break;
      case '2':
        Serial.println("Wait...");
        channel = fmrx_seek(SEEK_UP);
        Serial.println("Seek up.");
        Serial.print("Channel:");
        Serial.print(channel, 2);
        Serial.println("MHz");
        break;
      case '3':
        Serial.println("Wait...");
        if(vol < 0x0F){
          vol++;
        }
        fmrx_set_volume(vol);
        Serial.print("Volume+:");
        Serial.println(vol);
        break;
      case '4':
        Serial.println("Wait...");
        if(vol > 0){
          vol--;
        }
        fmrx_set_volume(vol);
        Serial.print("Volume-:");
        Serial.println(vol);
        break;
   /** check data for setting new channel. Input data must start with '&' and followed by 4 numbers, the first 3 is the integer part
    (Unit: MHz), the last one is the decimal part.And the channel must between 76MHz and 108Mhz.(eg: &0756 for 75.6MHz, and &0666 is out of range)
  */
        case '&':
        u8 i,buf[4];
         float ch;
         i=0;
         delay(30);
         while(Serial.available()&&i<4){
           buf[i]=Serial.read();
           if (buf[i]<= '9' && buf[i]>= '0') { 
           i++;}
           else{
           i=0;
           break;
           }
         }
         if (i==4){
           ch = (buf[0]-'0')*100+(buf[1]-'0')*10+(buf[2]-'0')*1+0.1*(buf[3]-'0');
           Serial.println(fmrx_set_freq(ch),2);
         }else{
           Serial.println("Input Error.");
         }
         /** dummy read for useless character */
         while(Serial.available()){
           Serial.read();
         }
         break;
    }
  }
}