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Added powerOff function #1

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58 changes: 47 additions & 11 deletions src/SparkFunSi4703.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,22 +11,43 @@ Si4703_Breakout::Si4703_Breakout(int resetPin, int sdioPin, int sclkPin)

void Si4703_Breakout::powerOn()
{
if(power == true) return;//radio is allready turned on
si4703_init();
power = true;
}

void Si4703_Breakout::powerOff()
{
if(power == false) return; //were not even turned on
readRegisters(); //Read the current register set
si4703_registers[POWERCFG] = 0x4041; //Disable the IC
updateRegisters(); //Update
digitalWrite(_resetPin, LOW);
power = false;
}

byte Si4703_Breakout::getPowerStatus()
{
return ((power == false) ? 0 : 1);
}





void Si4703_Breakout::setChannel(int channel)
{
//Freq(MHz) = 0.200(in USA) * Channel + 87.5MHz
//97.3 = 0.2 * Chan + 87.5
//9.8 / 0.2 = 49
int newChannel = channel * 10; //973 * 10 = 9730
newChannel -= 8750; //9730 - 8750 = 980
newChannel /= 10; //980 / 10 = 98
// int newChannel = channel * 10; //973 * 10 = 9730
// newChannel -= 8750; //9730 - 8750 = 980
// newChannel /= 10; //980 / 10 = 98

//These steps come from AN230 page 20 rev 0.5
readRegisters();
si4703_registers[CHANNEL] &= 0xFE00; //Clear out the channel bits
si4703_registers[CHANNEL] |= newChannel; //Mask in the new channel
si4703_registers[CHANNEL] |= channel; //Mask in the new channel
si4703_registers[CHANNEL] |= (1<<TUNE); //Set the TUNE bit to start
updateRegisters();

Expand Down Expand Up @@ -64,6 +85,7 @@ void Si4703_Breakout::setVolume(int volume)
readRegisters(); //Read the current register set
if(volume < 0) volume = 0;
if (volume > 15) volume = 15;
//si4703_registers[SYSCONFIG3] |= (1<<VOLEXT); //TEst extended volume
si4703_registers[SYSCONFIG2] &= 0xFFF0; //Clear volume bits
si4703_registers[SYSCONFIG2] |= volume; //Set new volume
updateRegisters(); //Update
Expand Down Expand Up @@ -140,8 +162,11 @@ void Si4703_Breakout::si4703_init()
// si4703_registers[POWERCFG] |= (1<<SMUTE) | (1<<DMUTE); //Disable Mute, disable softmute
si4703_registers[SYSCONFIG1] |= (1<<RDS); //Enable RDS

si4703_registers[SYSCONFIG1] |= (1<<DE); //50kHz Europe setup
si4703_registers[SYSCONFIG2] |= (1<<SPACE0); //100kHz channel spacing for Europe
//si4703_registers[SYSCONFIG1] |= (1<<DE); //Set FM De-Emphasis to europe 50us
si4703_registers[SYSCONFIG1] |= (0<<DE); //Set FM De-Emphasis to north america 75us
//si4703_registers[SYSCONFIG2] |= (1<<SPACE0); //100kHz channel spacing for Europe
si4703_registers[SYSCONFIG2] |= (0<<SPACE0); //200kHz channel spacing for North America
si4703_registers[SYSCONFIG2] |= (0<<SPACE1); //200kHz channel spacing for North America

si4703_registers[SYSCONFIG2] &= 0xFFF0; //Clear volume bits
si4703_registers[SYSCONFIG2] |= 0x0001; //Set volume to lowest
Expand Down Expand Up @@ -231,13 +256,24 @@ int Si4703_Breakout::seek(byte seekDirection){
return getChannel();
}

//Reads the current channel from READCHAN
//Returns a number like 973 for 97.3MHz
//Reads the current channel
int Si4703_Breakout::getChannel() {
readRegisters();
int channel = si4703_registers[READCHAN] & 0x03FF; //Mask out everything but the lower 10 bits
//Freq(MHz) = 0.100(in Europe) * Channel + 87.5MHz
//X = 0.1 * Chan + 87.5
channel += 875; //98 + 875 = 973
return(channel);
}

//Reads the current RSSI signal strength, stereo status, and RDS ready bit
//RSSI (Received Signal Strength Indicator).
//RSSI is measured units of dB�V in 1 dB increments with a maximum of approximately
//75 dB�V. Si4702/03-C19 does not report RSSI levels greater than 75 dBuV.
//Reads Stereo status and RDS status
void Si4703_Breakout::getStatus(byte* rssi, byte* stereo, byte* rds,byte* channel) {
readRegisters();
*rssi = si4703_registers[STATUSRSSI] & 0xFF; //Mask out everything but the lower 8 bits
*stereo = si4703_registers[STATUSRSSI] & (1<<STEREO);
*rds = si4703_registers[STATUSRSSI] & (1<<STEREO);
*channel = si4703_registers[READCHAN] & 0xFF; //Mask out everything but the lower 8 bits (actually 10 bits but we dont need)
return;
}

18 changes: 14 additions & 4 deletions src/SparkFunSi4703.h
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Original file line number Diff line number Diff line change
Expand Up @@ -51,10 +51,14 @@ class Si4703_Breakout
public:
Si4703_Breakout(int resetPin, int sdioPin, int sclkPin);
void powerOn(); // call in setup
void powerOff();
void setChannel(int channel); // 3 digit channel number
int getChannel();
int seekUp(); // returns the tuned channel or 0
int seekDown();
void setVolume(int volume); // 0 to 15
byte getPowerStatus();
void getStatus(byte* rssi, byte* stereo, byte* rds, byte* channel);
void readRDS(char* message, long timeout);
// message should be at least 9 chars
// result will be null terminated
Expand All @@ -67,7 +71,7 @@ class Si4703_Breakout
void readRegisters();
byte updateRegisters();
int seek(byte seekDirection);
int getChannel();
bool power = false;
uint16_t si4703_registers[16]; //There are 16 registers, each 16 bits large
static const uint16_t FAIL = 0;
static const uint16_t SUCCESS = 1;
Expand All @@ -84,6 +88,7 @@ class Si4703_Breakout
static const uint16_t CHANNEL = 0x03;
static const uint16_t SYSCONFIG1 = 0x04;
static const uint16_t SYSCONFIG2 = 0x05;
static const uint16_t SYSCONFIG3 = 0x06;
static const uint16_t STATUSRSSI = 0x0A;
static const uint16_t READCHAN = 0x0B;
static const uint16_t RDSA = 0x0C;
Expand All @@ -102,13 +107,18 @@ class Si4703_Breakout
static const uint16_t TUNE = 15;

//Register 0x04 - SYSCONFIG1
static const uint16_t RDS = 12;
static const uint16_t DE = 11;
static const uint16_t RDSIEN = 15; //RDS Interrupt Enable.
static const uint16_t STCIEN = 14; //Seek/Tune Complete Interrupt Enable.
static const uint16_t RDS = 12; //RDS Enable.
static const uint16_t DE = 11; //De-emphasis.

//Register 0x05 - SYSCONFIG2
static const uint16_t SPACE1 = 5;
static const uint16_t SPACE0 = 4;

//Register 0x05 - SYSCONFIG3
static const uint16_t VOLEXT = 8;

//Register 0x0A - STATUSRSSI
static const uint16_t RDSR = 15;
static const uint16_t STC = 14;
Expand All @@ -118,4 +128,4 @@ class Si4703_Breakout
static const uint16_t STEREO = 8;
};

#endif
#endif