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1309 lines (1180 loc) · 36.4 KB
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/// @file
/// Ports library definitions.
// 2009-02-13 <jc@wippler.nl> http://opensource.org/licenses/mit-license.php
#include "Ports.h"
#include <avr/sleep.h>
#include <util/atomic.h>
// #define DEBUG_DHT 1 // add code to send info over the serial port of non-zero
// ATtiny84 has BODS and BODSE for ATtiny84, revision B, and newer, even though
// the iotnx4.h header doesn't list it, so we *can* disable brown-out detection!
// See the ATtiny24/44/84 datasheet reference, section 7.2.1, page 34.
#if (defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny44__)) && \
!defined(BODSE) && !defined(BODS)
#define BODSE 2
#define BODS 7
#endif
// flag bits sent to the receiver
#define MODE_CHANGE 0x80 // a pin mode was changed
#define DIG_CHANGE 0x40 // a digital output was changed
#define PWM_CHANGE 0x30 // an analog (pwm) value was changed on port 2..3
#define ANA_MASK 0x0F // an analog read was requested on port 1..4
/// @class PortI2C
/// @details
/// The PortI2C class is a special version of class Port implementing the I2C /
/// Two-Wire Interface (TWI) protocol. Allows using any port as I2C bus master.
/// When used for I2C, DIO is used as SDA and AIO as SCL.
/// Unlike the Wire library for the Arduino, which is a more advanced solution
/// for the hardware I2C lines of an ATmega, the PortI2C class is implemented
/// entirely in software using "bit-banging". Another difference is that
/// PortI2C does not use interrupts and will keep the microcontroller occupied
/// while it is performing I/O transfers.
/// @see DeviceI2C
/// @class DeviceI2C
/// @details
/// Since I2C is a bus, there are actually two classes involved. A PortI2C
/// object manages a port as I2C master for one or more objects of class
/// DeviceI2C, each representing a separate device. You can have multiple ports
/// as I2C bus (running at a different speed perhaps), each talking to multiple
/// I2C devices. Devices sharing the same bus must each have a unique ID in the
/// range 0 .. 127.
/// @see PortI2C
/// @fn uint32_t Port::pulse(uint8_t state, uint32_t timeout =1000000L) const
/// @details
/// Measure the length of a pulse in microseconds on the DIO (pulse) or
/// AIO (pulse2) line. The optional timeout value specifies how many
/// microseconds to wait for a pulse - of none is received, 0 is returned.
/// @param state Polarity of the pulse to wait for - HIGH (1) or LOW (0).
/// @param timeout Max number of microseconds to wait.
/// Default is 1,000,000, i.e. 1 second.
/// @see http://arduino.cc/en/Reference/pulseIn for more details.
/// @fn void Port::shift(uint8_t bitOrder, uint8_t value) const
/// @details
/// This can be used to send out a pulse sequence of bits or to read such
/// a pulse sequence in. The AIO line is cycled while the value bits are
/// "shifted" and written out to (shift, shiftWrite) or read in from
/// (shiftRead) the DIO pin.
/// @param bitOrder How to shift bits in or out: either LSBFIRST (0) or
/// MSBFIRST (1), where LSB stands for Least Significant
/// Bit and MSB for Most Significant Bit.
/// @param value The value to shift out, with as many lower bits as needed.
/// This argument is a byte for shift() and a word for the more general
/// shiftWrite() function.
/// @see http://arduino.cc/en/Tutorial/ShiftOut
/// @fn static void Sleepy::powerDown ();
/// Take the ATmega into the deepest possible power down state. Getting out of
/// this state requires setting up the watchdog beforehand, or making sure that
/// suitable interrupts will occur once powered down.
/// Disables the Brown Out Detector (BOD), the A/D converter (ADC), and other
/// peripheral functions such as TWI, SPI, and UART before sleeping, and
/// restores their previous state when back up.
/// Shift a number of bites in to read them.
/// @param bitOrder How to shift bits in or out: either LSBFIRST (0) or
/// MSBFIRST (1), where LSB stands for Least Significant
/// Bit and MSB for Most Significant Bit.
/// @param count The number of bits to shift in or out. Must be in the
/// range 1 .. 16, the default is 8.
/// @see shift()
uint16_t Port::shiftRead(uint8_t bitOrder, uint8_t count) const {
uint16_t value = 0, mask = bit(LSBFIRST ? 0 : count - 1);
for (uint8_t i = 0; i < count; ++i) {
digiWrite2(1);
delayMicroseconds(5);
if (digiRead())
value |= mask;
if (bitOrder == LSBFIRST)
mask <<= 1;
else
mask >>= 1;
digiWrite2(0);
delayMicroseconds(5);
}
return value;
}
/// The shiftWrite() call is similar but more general than the shift() call
/// in that it allows an adjustable number of bits to be sent, not just 8.
/// @param bitOrder How to shift bits in or out: either LSBFIRST (0) or
/// MSBFIRST (1), where LSB stands for Least Significant
/// Bit and MSB for Most Significant Bit.
/// @param value The value to shift out, with as many lower bits as needed.
/// This argument is a byte for shift() and a word for the more general
/// shiftWrite() function.
/// @param count The number of bits to shift in or out. Must be in the
/// range 1 .. 16, the default is 8.
/// @see shift()
void Port::shiftWrite(uint8_t bitOrder, uint16_t value, uint8_t count) const {
uint16_t mask = bit(LSBFIRST ? 0 : count - 1);
for (uint8_t i = 0; i < count; ++i) {
digiWrite((value & mask) != 0);
if (bitOrder == LSBFIRST)
mask <<= 1;
else
mask >>= 1;
digiWrite2(1);
digiWrite2(0);
}
}
RemoteNode::RemoteNode (char id, uint8_t band, uint8_t group)
: nid (id & 0x1F)
{
memset(&data, 0, sizeof data);
RemoteHandler::setup(nid, band, group);
}
void RemoteNode::poll(uint16_t msecs) {
uint8_t pending = millis() >= lastPoll + msecs;
if (RemoteHandler::poll(*this, pending))
lastPoll = millis();
}
void RemotePort::mode(uint8_t value) const {
node.data.flags |= MODE_CHANGE;
bitWrite(node.data.modes, pinBit(), value);
}
uint8_t RemotePort::digiRead() const {
return bitRead(node.data.digiIO, pinBit());
}
void RemotePort::digiWrite(uint8_t value) const {
node.data.flags |= DIG_CHANGE;
bitWrite(node.data.digiIO, pinBit(), value);
}
void RemotePort::anaWrite(uint8_t val) const {
if (portNum == 2 || portNum == 3) {
bitSet(node.data.flags, portNum + 2);
node.data.anaOut[portNum - 2] = val;
} else
digiWrite2(val >= 128);
}
void RemotePort::mode2(uint8_t value) const {
node.data.flags |= MODE_CHANGE;
bitWrite(node.data.modes, pinBit2(), value);
}
uint16_t RemotePort::anaRead() const {
bitSet(node.data.flags, pinBit());
return node.data.anaIn[pinBit()];
}
uint8_t RemotePort::digiRead2() const {
return bitRead(node.data.digiIO, pinBit2());
}
void RemotePort::digiWrite2(uint8_t value) const {
node.data.flags |= DIG_CHANGE;
bitWrite(node.data.digiIO, pinBit2(), value);
}
PortI2C::PortI2C (uint8_t num, uint8_t rate)
: Port (num), uswait (rate)
{
sdaOut(1);
mode2(OUTPUT);
sclHi();
}
uint8_t PortI2C::start(uint8_t addr) const {
sclLo();
sclHi();
sdaOut(0);
return write(addr);
}
void PortI2C::stop() const {
sdaOut(0);
sclHi();
sdaOut(1);
}
uint8_t PortI2C::write(uint8_t data) const {
sclLo();
for (uint8_t mask = 0x80; mask != 0; mask >>= 1) {
sdaOut(data & mask);
sclHi();
sclLo();
}
sdaOut(1);
sclHi();
uint8_t ack = ! sdaIn();
sclLo();
return ack;
}
uint8_t PortI2C::read(uint8_t last) const {
uint8_t data = 0;
for (uint8_t mask = 0x80; mask != 0; mask >>= 1) {
sclHi();
if (sdaIn())
data |= mask;
sclLo();
}
sdaOut(last);
sclHi();
sclLo();
if (last)
stop();
sdaOut(1);
return data;
}
bool DeviceI2C::isPresent () const {
byte ok = send();
stop();
return ok;
}
byte MilliTimer::poll(word ms) {
byte ready = 0;
if (armed) {
word remain = next - millis();
// since remain is unsigned, it will overflow to large values when
// the timeout is reached, so this test works as long as poll() is
// called no later than 5535 millisecs after the timer has expired
if (remain <= 60000)
return 0;
// return a value between 1 and 255, being msecs+1 past expiration
// note: the actual return value is only reliable if poll() is
<
10BC8
/div> // called no later than 255 millisecs after the timer has expired
ready = -remain;
}
set(ms);
return ready;
}
word MilliTimer::remaining() const {
word remain = armed ? next - millis() : 0;
return remain <= 60000 ? remain : 0;
}
void MilliTimer::set(word ms) {
armed = ms != 0;
if (armed)
next = millis() + ms - 1;
}
/** Turn on the corresponding leds.
* @param mask 0 for neither led, 1 for the first led, 2 for the second led
* or 3 for both leds.
*/
void BlinkPlug::ledOn (byte mask) {
if (mask & 1) {
digiWrite(0);
mode(OUTPUT);
}
if (mask & 2) {
digiWrite2(0);
mode2(OUTPUT);
}
leds |= mask; //TODO could be read back from pins, i.s.o. saving here
}
/** Turn off the corresponding leds.
* @param mask 0 for neither led, 1 for the first led, 2 for the second led
* or 3 for both leds.
*/
void BlinkPlug::ledOff (byte mask) {
if (mask & 1) {
mode(INPUT);
digiWrite(1);
}
if (mask & 2) {
mode2(INPUT);
digiWrite2(1);
}
leds &= ~ mask; //TODO could be read back from pins, i.s.o. saving here
}
/** Read entire BlinkPlug state.
* @return One byte with the state of the leds on the 1st and 2nd least
* significant bits and the state of the buttons on the 3rd and 4th least
* significant bits.
*/
byte BlinkPlug::state () {
byte saved = leds;
ledOff(1+2);
byte result = !digiRead() | (!digiRead2() << 1);
ledOn(saved);
return result;
}
/// @deprecated This is obsolete code, use buttonCheck().
byte BlinkPlug::pushed () {
if (debounce.idle() || debounce.poll()) {
byte newState = state();
if (newState != lastState) {
debounce.set(100); // don't check again for at least 100 ms
byte nowOn = (lastState ^ newState) & newState;
lastState = newState;
return nowOn;
}
}
return 0;
}
/** Check the state of the buttons.
* @return The corresponding enum state: ON1, OFF1, ON2, or OFF2.
*/
byte BlinkPlug::buttonCheck () {
// collect button changes in the checkFlags bits, with proper debouncing
if (debounce.idle() || debounce.poll()) {
byte newState = state();
if (newState != lastState) {
debounce.set(100); // don't check again for at least 100 ms
if ((lastState ^ newState) & 1)
bitSet(checkFlags, newState & 1 ? ON1 : OFF1);
if ((lastState ^ newState) & 2)
bitSet(checkFlags, newState & 2 ? ON2 : OFF2);
lastState = newState;
}
}
// note that simultaneous button events will be returned in successive calls
if (checkFlags)
for (byte i = ON1; i <= OFF2; ++i) {
if (bitRead(checkFlags, i)) {
bitClear(checkFlags, i);
return i;
}
}
// if there are no button events, return the overall current button state
return lastState == 3 ? ALL_ON : lastState ? SOME_ON : ALL_OFF;
}
void MemoryPlug::load (word page, void* buf, byte offset, int count) {
// also don't load right after a save, see http://forum.jeelabs.net/node/469
while (millis() < nextSave)
;
setAddress(0x50 + (page >> 8));
send();
write((byte) page);
write(offset);
receive();
byte* p = (byte*) buf;
while (--count >= 0)
*p++ = read(count == 0);
stop();
}
void MemoryPlug::save (word page, const void* buf, byte offset, int count) {
// don't do back-to-back saves, last one must have had time to finish!
while (millis() < nextSave)
;
setAddress(0x50 + (page >> 8));
send();
write((byte) page);
write(offset);
const byte* p = (const byte*) buf;
while (--count >= 0)
write(*p++);
stop();
nextSave = millis() + 6;
// delay(5);
}
long MemoryStream::position (byte writing) const {
long v = (curr - start) * step;
if (pos > 0 && !writing)
--v; // get() advances differently than put()
return (v << 8) | pos;
}
byte MemoryStream::get () {
if (pos == 0) {
dev.load(curr, buffer);
curr += step;
}
return buffer[pos++];
}
void MemoryStream::put (byte data) {
buffer[pos++] = data;
if (pos == 0) {
dev.save(curr, buffer);
curr += step;
}
}
word MemoryStream::flush () {
if (pos != 0) {
memset(buffer + pos, 0xFF, 256 - pos);
dev.save(curr, buffer);
}
return curr;
}
void MemoryStream::reset () {
curr = start;
pos = 0;
}
// uart register definitions
#define RHR (0 << 3)
#define THR (0 << 3)
#define DLL (0 << 3)
#define DLH (1 << 3)
#define FCR (2 << 3)
#define LCR (3 << 3)
#define RXLVL (9 << 3)
/** Set a UartPlug register.
* @param reg The register to set.
* @param value The value to write to the register.
*/
void UartPlug::regSet (byte reg, byte value) {
dev.send();
dev.write(reg);
dev.write(value);
}
/** Read a UartPlug register.
* @return reg The contents of the register read.
*/
void UartPlug::regRead (byte reg) {
dev.send();
dev.write(reg);
dev.receive();
}
/** Initialize a UartPlug.
* @param baud Baud rate for the serial port.
*/
void UartPlug::begin (long baud) {
word divisor = 230400 / baud;
regSet(LCR, 0x80); // divisor latch enable
regSet(DLL, divisor); // low byte
regSet(DLH, divisor >> 8); // high byte
regSet(LCR, 0x03); // 8 bits, no parity
regSet(FCR, 0x07); // fifo enable (and flush)
dev.stop();
}
/** Test if UartPlug has incoming data.
* @return True if data in device buffer. False if no data in device buffer.
*/
byte UartPlug::available () {
if (in != out)
return 1;
out = 0;
regRead(RXLVL);
in = dev.read(1);
if (in == 0)
return 0;
if (in > sizeof rxbuf)
in = sizeof rxbuf;
regRead(RHR);
for (byte i = 0; i < in; ++i)
rxbuf[i] = dev.read(i == in - 1);
return 1;
}
/** Read two bytes from the UartPlug's serial input.
* @return Two bytes with the data read.
*/
int UartPlug::read () {
return available() ? rxbuf[out++] : -1;
}
/// Clear the RX and TX queues.
void UartPlug::flush () {
regSet(FCR, 0x07); // flush both RX and TX queues
dev.stop();
in = out;
}
/** Write data on the serial port of the UartPlug.
* @param data Byte of data to send out.
*/
WRITE_RESULT UartPlug::write (byte data) {
regSet(THR, data);
dev.stop();
#if ARDUINO >= 100 && !defined(__AVR_ATtiny84__) && !defined(__AVR_ATtiny85__) && !defined(__AVR_ATtiny44__) && !defined(__AVR_ATtiny45__)
return 1;
#endif
}
void DimmerPlug::begin () {
setReg(MODE1, 0x00); // normal
setReg(MODE2, 0x14); // inverted, totem-pole
setReg(GRPPWM, 0xFF); // set group dim to max brightness
setMulti(LEDOUT0, 0xFF, 0xFF, 0xFF, 0xFF, -1); // all LEDs group-dimmable
}
byte DimmerPlug::getReg(byte reg) const {
send();
write(reg);
receive();
byte result = read(1);
stop();
return result;
}
void DimmerPlug::setReg(byte reg, byte value) const {
send();
write(reg);
write(value);
stop();
}
void DimmerPlug::setMulti(byte reg, ...) const {
va_list ap;
va_start(ap, reg);
send();
write(0xE0 | reg); // auto-increment
for (;;) {
int v = va_arg(ap, int);
if (v < 0) break;
write(v);
}
stop();
}
/** Set the gain mode of the 16x multiplier in the LuxPlug.
* @param high Multiplier is off if 0, otherwise on.
*/
void LuxPlug::setGain(byte high) {
send();
write(0x81); // write to Timing regiser
write(high ? 0x12 : 0x02);
stop();
}
/** Read the raw data from the photodiodes.
* @return Two bytes containing the raw data read from the sensor.
*/
const word* LuxPlug::getData() {
send();
write(0xA0 | DATA0LOW);
receive();
data.b[0] = read(0);
data.b[1] = read(0);
data.b[2] = read(0);
data.b[3] = read(1);
stop();
return data.w;
}
#define LUX_SCALE 14 // scale by 2^14
#define RATIO_SCALE 9 // scale ratio by 2^9
#define CH_SCALE 10 // scale channel values by 2^10
/** Calculate Lux value from the raw data retreived.
* @param iGain gain, where 0:1X, 1:16X.
* @param tInt Integration time, where 0:13.7mS, 1:100mS, 2:402mS, 3:Manual
* @return A 2 byte unsigned number containing the Lux value calculated.
*/
word LuxPlug::calcLux(byte iGain, byte tInt) const
{
unsigned long chScale;
switch (tInt) {
case 0: chScale = 0x7517; break;
case 1: chScale = 0x0fe7; break;
default: chScale = (1 << CH_SCALE); break;
}
if (!iGain)
chScale <<= 4;
unsigned long channel0 = (data.w[0] * chScale) >> CH_SCALE;
unsigned long channel1 = (data.w[1] * chScale) >> CH_SCALE;
unsigned long ratio1 = 0;
if (channel0 != 0)
ratio1 = (channel1 << (RATIO_SCALE+1)) / channel0;
unsigned long ratio = (ratio1 + 1) >> 1;
word b, m;
if (ratio <= 0x0040) { b = 0x01F2; m = 0x01BE; }
else if (ratio <= 0x0080) { b = 0x0214; m = 0x02D1; }
else if (ratio <= 0x00C0) { b = 0x023F; m = 0x037B; }
else if (ratio <= 0x0100) { b = 0x0270; m = 0x03FE; }
else if (ratio <= 0x0138) { b = 0x016F; m = 0x01FC; }
else if (ratio <= 0x019A) { b = 0x00D2; m = 0x00FB; }
else if (ratio <= 0x029A) { b = 0x0018; m = 0x0012; }
else { b = 0x0000; m = 0x0000; }
unsigned long temp = channel0 * b - channel1 * m;
temp += 1 << (LUX_SCALE-1);
return temp >> LUX_SCALE;
}
void GravityPlug::sensitivity(byte range, word bandwidth) {
send();
write(0x14);
byte bwcode = bandwidth <= 25 ? 0 :
bandwidth <= 50 ? 1 :
bandwidth <= 100 ? 2 :
bandwidth <= 190 ? 3 :
bandwidth <= 375 ? 4 :
bandwidth <= 750 ? 5 : 6;
// this only works correctly if range is 2, 4, or 8
write(((range & 0x0C) << 1) | bwcode);
stop();
}
const int* GravityPlug::getAxes() {
send();
write(0x02);
receive();
for (byte i = 0; i < 5; ++i)
data.b[i] = read(0);
data.b[5] = read(1);
stop();
data.w[0] = (data.b[0] >> 6) | (data.b[1] << 2);
data.w[1] = (data.b[2] >> 6) | (data.b[3] << 2);
data.w[2] = (data.b[4] >> 6) | (data.b[5] << 2);
for (byte i = 0; i < 3; ++i)
data.w[i] = (data.w[i] ^ 0x200) - 0x200; // sign extends bit 9
return data.w;
}
/** Select the channel on the multiplexer.
* @param channel A number between 0..15.
*/
void InputPlug::select(uint8_t channel) {
digiWrite(0);
mode(OUTPUT);
delayMicroseconds(slow ? 400 : 50);
byte data = 0x10 | (channel & 0x0F);
byte mask = 1 << (portNum + 3); // digitalWrite is too slow
ATOMIC_BLOCK(ATOMIC_FORCEON) {
for (byte i = 0; i < 5; ++i) {
byte us = bitRead(data, 4 - i) ? 9 : 3;
if (slow)
us <<= 3;
#ifdef PORTD
PORTD |= mask;
delayMicroseconds(us);
PORTD &= ~ mask;
#else
//XXX TINY!
#endif
delayMicroseconds(slow ? 32 : 4);
}
}
}
byte HeadingBoard::eepromByte(byte reg) const {
eeprom.send();
eeprom.write(reg);
eeprom.receive();
byte result = eeprom.read(1);
eeprom.stop();
return result;
}
void HeadingBoard::getConstants() {
for (byte i = 0; i < 18; ++i)
((byte*) &C1)[i < 14 ? i^1 : i] = eepromByte(16 + i);
// Serial.println(C1);
// Serial.println(C2);
// Serial.println(C3);
// Serial.println(C4);
// Serial.println(C5);
// Serial.println(C6);
// Serial.println(C7);
// Serial.println(A, DEC);
// Serial.println(B, DEC);
// Serial.println(C, DEC);
// Serial.println(D, DEC);
}
word HeadingBoard::adcValue(byte press) const {
aux.digiWrite(1);
adc.send();
adc.write(0xFF);
adc.write(0xE0 | (press << 4));
adc.stop();
delay(40);
adc.send();
adc.write(0xFD);
adc.receive();
byte msb = adc.read(0);
int result = (msb << 8) | adc.read(1);
adc.stop();
aux.digiWrite(0);
return result;
}
void HeadingBoard::begin() {
// prepare ADC
aux.mode(OUTPUT);
aux.digiWrite(0);
// generate 32768 Hz on IRQ pin (OC2B)
#ifdef TCCR2A
TCCR2A = bit(COM2B0) | bit(WGM21);
TCCR2B = bit(CS20);
OCR2A = 243;
#else
//XXX TINY!
#endif
aux.mode3(OUTPUT);
getConstants();
}
void HeadingBoard::pressure(int& temp, int& pres) const {
word D2 = adcValue(0);
// Serial.print("D2 = ");
// Serial.println(D2);
int corr = (D2 - C5) >> 7;
// Serial.print("corr = ");
// Serial.println(corr);
int dUT = (D2 - C5) - (corr * (long) corr * (D2 >= C5 ? A : B) >> C);
// Serial.print("dUT = ");
// Serial.println(dUT);
temp = 250 + ((long) dUT * C6 >> 16) - (dUT >> D);
word D1 = adcValue(1);
// Serial.print("D1 = ");
// Serial.println(D1);
word OFF = (C2 + ((C4 - 1024) * dUT >> 14)) << 2;
// Serial.print("OFF = ");
// Serial.println(OFF);
word SENS = C1 + (C3 * dUT >> 10);
// Serial.print("SENS = ");
// Serial.println(SENS);
word X = (SENS * (D1 - 7168L) >> 14) - OFF;
// Serial.print("X = ");
// Serial.println(X);
pres = (X * 10L >> 5) + C7;
}
void HeadingBoard::heading(int& xaxis, int& yaxis) {
// set or reset the magnetometer coil
compass.send();
compass.write(0x00);
compass.write(setReset);
compass.stop();
delayMicroseconds(50);
setReset = 6 - setReset;
// perform measurement
compass.send();
compass.write(0x00);
compass.write(0x01);
compass.stop();
delay(5);
compass.send();
compass.write(0x00);
compass.receive();
byte tmp = compass.read(0);
tmp = compass.read(0);
xaxis = ((tmp << 8) | compass.read(0)) - 2048;
tmp = compass.read(0);
yaxis = ((tmp << 8) | compass.read(1)) - 2048;
compass.stop();
}
int CompassBoard::read2 (byte last) {
byte b = read(0);
return (b << 8) | read(last);
}
float CompassBoard::heading () {
send();
write(0x01); // Configuration Register B
write(0x40); // Reg B: +/- 1.9 Ga
stop();
send();
write(0x02); // Data Output X MSB Register
write(0x00); // Mode: Continuous-Measurement Mode
receive();
int x = read2(0);
/* int z = */ read2(0);
int y = read2(1);
stop();
return degrees(atan2(y, x));
}
InfraredPlug::InfraredPlug (uint8_t num)
: Port (num), slot (140), gap (80), fill (-1), prev (0) {
digiWrite(0);
mode(OUTPUT);
mode2(INPUT);
digiWrite2(1); // pull-up
}
void InfraredPlug::configure(uint8_t slot4, uint8_t gap256) {
slot = slot4;
gap = gap256;
fill = -1;
}
void InfraredPlug::poll() {
byte bit = digiRead2(); // 0 is interpreted as pulse ON
if (fill < 0) {
if (fill < -1 || bit == 1)
return;
fill = 0;
prev = micros();
memset(buf, 0, sizeof buf);
}
// act only if the bit changed, using the low bit of the nibble fill count
if (bit != (fill & 1) && fill < 2 * (int) sizeof buf) {
uint32_t curr = micros(), diff = (curr - prev + 2) >> 2;
if (diff > 65000)
diff = 65000; // * 4 us, i.e. 260 ms
// convert to a slot number, with rounding halfway between each slot
word ticks = ((word) diff + slot / 2) / slot;
if (ticks > 20)
ticks = 20;
// condense upper values to fit in the range 0..15
byte nibble = ticks;
if (nibble > 10)
nibble -= (nibble - 10) / 2;
buf[fill>>1] |= nibble << ((fill & 1) << 2);
++fill;
prev = curr;
}
}
uint8_t InfraredPlug::done() {
byte result = 0;
if (fill > 0)
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
if (((micros() - prev) >> 8) >= gap) {
result = fill;
fill = -2; // prevent new pulses from clobbering buf
}
}
else if (fill < -1)
fill = -1; // second call to done() release buffer again for capture
return result;
}
uint8_t InfraredPlug::decoder(uint8_t nibbles) {
switch (nibbles) {
case 67: // 2 + 64 + 1 nibbles could be a NEC packet
if (buf[0] == 0x8D && buf[33] == 0x01) {
// check that all nibbles are either 1 or 3
for (byte i = 1; i < 33; ++i)
if ((buf[i] & ~0x20) != 0x11)
return UNKNOWN;
// valid packet, convert in-place
for (byte i = 0; i < 4; ++i) {
byte v = 0;
for (byte j = 0; j < 8; ++j)
v = (v << 1) | (buf[1+j+8*i] >> 5);
buf[i] = v;
}
return NEC;
}
break;
case 3: // 2 + 1 nibbles could be a NEC repeat packet
if (buf[0] == 0x4D && buf[1] == 0x01)
return NEC_REP;
break;
}
return UNKNOWN;
}
void InfraredPlug::send(const uint8_t* data, uint16_t bits) {
// TODO: switch to an interrupt-driven design
for (byte i = 0; i < bits; ++i) {
digiWrite(bitRead(data[i/8], i%8));
delayMicroseconds(4 * slot);
}
digiWrite(0);
}
void ProximityPlug::begin() {
delay(100);
setReg(CONFIG, 0x04); // reset, STOP1
delay(100);
// setReg(TPCONFIG, 0xB5); // TPSE, BKA, ACE, TPTBE, TPE
setReg(TPCONFIG, 0xB1); // TPSE, BKA, ACE, TPE
setReg(CONFIG, 0x15); // RUN1
delay(100);
}
void ProximityPlug::setReg(byte reg, byte value) const {
send();
write(reg);
write(value);
stop();
}
byte ProximityPlug::getReg(byte reg) const {
send();
write(reg);
receive();
byte result = read(1);
stop();
return result;
}
void AnalogPlug::begin (byte mode) {
// default mode is channel 1, continuous, 18-bit, gain x1
config = mode;
select(1);
}
void AnalogPlug::select (byte channel) {
send();
write(0x80 | ((channel - 1) << 5) | (config & 0x1F));
stop();
}
long AnalogPlug::reading () {
// read out 4 bytes, caller will need to shift out the irrelevant lower bits
receive();
long raw = read(0) << 8;
raw |= read(0);
raw = (raw << 16) | (read(0) << 8);
raw |= read(1);
stop();
return raw;
}
DHTxx::DHTxx (byte pinNum) : pin (pinNum) {
digitalWrite(pin, HIGH);
}
bool DHTxx::reading (int& temp, int &humi) {
pinMode(pin, OUTPUT);
delay(10); // wait for any previous transmission to end
digitalWrite(pin, LOW);
delay(18);
cli();
digitalWrite(pin, HIGH);
delayMicroseconds(30);
pinMode(pin, INPUT);
byte data[6]; // holds a few start bits and then the 5 real payload bytes
#if DEBUG_DHT
static byte times[48];
memset(times, 0, sizeof times);
#endif
// each bit is a high edge followed by a var-length low edge
for (byte i = 7; i < 48; ++i) {
// wait for the high edge, then measure time until the low edge
byte timer;
for (byte j = 0; j < 2; ++j)
for (timer = 0; timer < 250; ++timer)
if (digitalRead(pin) != j)
break;
#if DEBUG_DHT
times[i] = timer;
#endif
// if no transition was seen, return
if (timer >= 250) {
sei();
return false;
}
// collect each bit in the data buffer
byte offset = i / 8;
data[offset] <<= 1;
data[offset] |= timer > 7;
}
sei();
#if DEBUG_DHT
Serial.print("DHT");
for (byte i = 7; i < 48; ++i) {
Serial.print(' ');
Serial.print(times[i]);
}
Serial.println();