void ADS1299::updateChannelData(){
byte inByte;
int byteCounter = 0;
csLow(); // open SPI
for(int i=0; i<3; i++){
inByte = xfer(0x00); // read status register (1100 + LOFF_STATP + LOFF_STATN + GPIO[7:4])
stat = (stat << 8) | inByte;
}
for(int i = 0; i<8; i++){
for(int j=0; j<3; j++){ // read 24 bits of channel data in 8 3 byte chunks
inByte = xfer(0x00);
rawChannelData[byteCounter] = inByte;
byteCounter++;
channelData[i] = (channelData[i]<<8) | inByte;
}
}
csHigh(); // close SPI
for(int i=0; i<8; i++){ // convert 3 byte 2's compliment to 4 byte 2's compliment
if(bitRead(channelData[i],23) == 1){
channelData[i] |= 0xFF000000;
}else{
channelData[i] &= 0x00FFFFFF;
}
}
}
// Read more than one register starting at _address
void ADS1299::RREGS(byte _address, byte _numRegistersMinusOne) {
// for(byte i = 0; i < 0x17; i++){
// regData[i] = 0; // reset the regData array
// }
byte opcode1 = _address + 0x20; // RREG expects 001rrrrr where rrrrr = _address
csLow(); // open SPI
xfer(opcode1); // opcode1
xfer(_numRegistersMinusOne); // opcode2
for(int i = 0; i <= _numRegistersMinusOne; i++){
regData[_address + i] = xfer(0x00); // add register byte to mirror array
}
csHigh(); // close SPI
if(verbosity){ // verbosity output
for(int i = 0; i<= _numRegistersMinusOne; i++){
printRegisterName(_address + i);
printHex(_address + i);
Serial.print(", ");
printHex(regData[_address + i]);
Serial.print(", ");
for(int j = 0; j<8; j++){
Serial.print(bitRead(regData[_address + i], 7-j));
if(j!=7) Serial.print(", ");
}
Serial.println();
delay(30);
}
}
}
void ADS1299::WREG(byte _address, byte _value) { // Write ONE register at _address
byte opcode1 = _address + 0x40; // WREG expects 010rrrrr where rrrrr = _address
csLow(); // open SPI
xfer(opcode1); // Send WREG command & address
xfer(0x00); // Send number of registers to read -1
xfer(_value); // Write the value to the register
csHigh(); // close SPI
regData[_address] = _value; // update the mirror array
if(verbosity){ // verbosity output
Serial.print("Register ");
printHex(_address);
Serial.println(" modified.");
}
}
void Tune::writeSCI(byte registerAddress, byte highbyte, byte lowbyte)
{
while (!digitalRead(DREQ)); // DREQ high <-> VS1011 available
csLow(); // Select control
SPI.transfer(VS_WRITE); // Write instruction
SPI.transfer(registerAddress);
// MSB first
SPI.transfer(highbyte);
while (!digitalRead(DREQ)); // wait 'til cmd is complete
SPI.transfer(lowbyte);
while (!digitalRead(DREQ));
csHigh(); // Deselect control
}
void ADS1299::WREGS(byte _address, byte _numRegistersMinusOne) {
byte opcode1 = _address + 0x40; // WREG expects 010rrrrr where rrrrr = _address
csLow(); // open SPI
xfer(opcode1); // Send WREG command & address
xfer(_numRegistersMinusOne); // Send number of registers to read -1
for (int i=_address; i <=(_address + _numRegistersMinusOne); i++){
xfer(regData[i]); // Write to the registers
}
digitalWrite(CS,HIGH); // close SPI
if(verbosity){
Serial.print("Registers ");
printHex(_address); Serial.print(" to ");
printHex(_address + _numRegistersMinusOne);
Serial.println(" modified");
}
}
/********************************************************
* spiTwoTransfer
*
* Inputs------------------------------------------------
* data (unsigned char*) Pointer to data buffer.
* (Data to be output)
* recData (unsigned char*) Pointer to receive data
* data buffer
* numBytes (uint8_t) The number of bytes to
* be transfered in/out
*
* This routine will transfer out a specified number of
* bytes.
********************************************************/
void spiTwoTransfer(unsigned char *data, unsigned char *recData, uint8_t numBytes)
{
uint8_t index = 0;
csLow(); // Set the chip select low to start transmission
while(numBytes > 0) // More data to transfer
{
if (SPI2->SR & SPI_SR_TXE) // SPI2 TX buffer empty
{
SPI2->DR = data[index]; // Fill the data register with current byte
while((SPI2->SR & SPI_SR_RXNE) == 0); // Wait for end of frame
recData[index] = SPI2->DR; // Read available data (also clears RXNE bit)
numBytes--; // Decrement number of bytes left to send
index++; // Increment data buffer index
}
}
csHigh(); // All data sent/received, return chip select to high
} /* END spiTwoTransfer */
unsigned int Tune::readSCI(byte registerAddress)
{
byte hiByte, loByte;
while (!digitalRead(DREQ)); // DREQ high <-> VS1011 available
csLow(); // Select control
SPI.transfer(VS_READ); // Read instruction
SPI.transfer(registerAddress);
// MSB first
hiByte = SPI.transfer(0x00);
while (!digitalRead(DREQ)); // wait 'til cmd is complete
loByte = SPI.transfer(0x00);
while (!digitalRead(DREQ));
csHigh(); // Deselect control
unsigned int response = word(hiByte, loByte);
return response;
}
void ADS1299::RDATA() { // use in Stop Read Continuous mode when DRDY goes low
byte inByte; // to read in one sample of the channels
csLow(); // open SPI
xfer(_RDATA); // send the RDATA command
stat = xfer(0x00); // read status register (1100 + LOFF_STATP + LOFF_STATN + GPIO[7:4])
for(int i = 0; i<8; i++){
for(int j=0; j<3; j++){ // read in the status register and new channel data
inByte = xfer(0x00);
channelData[i] = (channelData[i]<<8) | inByte;
}
}
csHigh(); // close SPI
for(int i=0; i<8; i++){
if(bitRead(channelData[i],23) == 1){ // convert 3 byte 2's compliment to 4 byte 2's compliment
channelData[i] |= 0xFF000000;
}else{
channelData[i] &= 0x00FFFFFF;
}
}
}
byte ADS1299::RREG(byte _address) { // reads ONE register at _address
byte opcode1 = _address + 0x20; // RREG expects 001rrrrr where rrrrr = _address
csLow(); // open SPI
xfer(opcode1); // opcode1
xfer(0x00); // opcode2
regData[_address] = xfer(0x00);// update mirror location with returned byte
csHigh(); // close SPI
if (verbosity){ // verbosity output
printRegisterName(_address);
printHex(_address);
Serial.print(", ");
printHex(regData[_address]);
Serial.print(", ");
for(byte j = 0; j<8; j++){
Serial.print(bitRead(regData[_address], 7-j));
if(j!=7) Serial.print(", ");
}
Serial.println();
}
return regData[_address]; // return requested register value
}
void ADS1299::SDATAC() {
csLow();
xfer(_SDATAC);
csHigh();
delayMicroseconds(3); //must wait 4 tCLK cycles after executing this command (Datasheet, pg. 37)
}
void ADS1299::RDATAC() {
csLow();
xfer(_RDATAC);
csHigh();
delayMicroseconds(3);
}
void ADS1299::STOP() { //stop data conversion
csLow();
xfer(_STOP);
csHigh();
}
void ADS1299::START() { //start data conversion
csLow();
xfer(_START);
csHigh();
}
void ADS1299::RESET() { // reset all the registers to default settings
csLow();
xfer(_RESET);
delayMicroseconds(12); //must wait 18 tCLK cycles to execute this command (Datasheet, pg. 35)
csHigh();
}
void ADS1299::STANDBY() { // only allowed to send WAKEUP after sending STANDBY
csLow();
xfer(_STANDBY);
csHigh();
}
//System Commands
void ADS1299::WAKEUP() {
csLow();
xfer(_WAKEUP);
csHigh();
delayMicroseconds(3); //must wait 4 tCLK cycles before sending another command (Datasheet, pg. 35)
}
