static void writeCommand(byte reg, byte value)
{
Wire1.beginTransmission((uint8_t)BMP085_ADDRESS);
#if ARDUINO >= 100
Wire1.write((uint8_t)reg);
Wire1.write((uint8_t)value);
#else
Wire1.send(reg);
Wire1.send(value);
#endif
Wire1.endTransmission();
}
/** Read multiple bytes from an 8-bit device register.
* @param useSPI true : use SPI
* @param devAddr I2C slave device address
* @param regAddr First register regAddr to read from
* @param length Number of bytes to read
* @param data Buffer to store read data in
* @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
* @return Number of bytes read (0 indicates failure)
*/
int8_t I2Cdev::readBytes(bool useSPI, uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data, uint16_t timeout) {
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(useSPI ? "SPI (0x" : "I2C 0x");
Serial.print(devAddr, HEX);
Serial.print(") reading ");
Serial.print(length, DEC);
Serial.print(" bytes from 0x");
Serial.print(regAddr, HEX);
Serial.print("...");
#endif
int8_t count = 0;
// I2C
if (!useSPI) {
Wire.beginTransmission(devAddr);
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
Wire.send(regAddr);
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
Wire.write(regAddr);
#endif
Wire.endTransmission();
Wire.beginTransmission(devAddr);
Wire.requestFrom(devAddr, length);
uint32_t t1 = millis();
for (; Wire.available() && (timeout == 0 || millis() - t1 < timeout); count++) {
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
data[count] = Wire.receive();
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
data[count] = Wire.read();
#endif
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(data[count], HEX);
if (count + 1 < length) Serial.print(" ");
#endif
}
if (timeout > 0 && millis() - t1 >= timeout && count < length) count = -1; // timeout
Wire.endTransmission();
} else {
digitalWrite(devAddr, LOW);
byte Addr = regAddr | 0x80;
SPI.transfer(Addr);
for (uint8_t cnt=0; cnt < length; cnt++) {
data[cnt] = SPI.transfer(0);
count++;
}
digitalWrite(devAddr, HIGH);
}
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(". Done (");
Serial.print(count, DEC);
Serial.println(" read).");
#endif
return count;
}
/** Read multiple bytes from an 8-bit device register.
* @param devAddr I2C slave device address
* @param regAddr First register regAddr to read from
* @param length Number of bytes to read
* @param data Buffer to store read data in
* @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
* @return Number of bytes read (0 indicates failure)
*/
int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data, uint16_t timeout) {
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print("I2C (0x");
Serial.print(devAddr, HEX);
Serial.print(") reading ");
Serial.print(length, DEC);
Serial.print(" bytes from 0x");
Serial.print(regAddr, HEX);
Serial.print("...");
#endif
int8_t count = 0;
Wire.beginTransmission(devAddr);
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
Wire.send(regAddr);
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
Wire.write(regAddr);
#endif
Wire.endTransmission();
Wire.beginTransmission(devAddr);
Wire.requestFrom(devAddr, length);
uint32_t t1 = millis();
for (; Wire.available() && (timeout == 0 || millis() - t1 < timeout); count++) {
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
data[count] = Wire.receive();
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
data[count] = Wire.read();
#endif
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(data[count], HEX);
if (count + 1 < length) Serial.print(" ");
#endif
}
if (timeout > 0 && millis() - t1 >= timeout && count < length) count = -1; // timeout
Wire.endTransmission();
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(". Done (");
Serial.print(count, DEC);
Serial.println(" read).");
#endif
return count;
}
static void read16(byte reg, uint16_t *value)
{
Wire1.beginTransmission((uint8_t)BMP085_ADDRESS);
#if ARDUINO >= 100
Wire1.write((uint8_t)reg);
#else
Wire1.send(reg);
#endif
Wire1.endTransmission();
Wire1.requestFrom((uint8_t)BMP085_ADDRESS, (byte)2);
#if ARDUINO >= 100
*value = (Wire1.read() << 8) | Wire1.read();
#else
*value = (Wire1.receive() << 8) | Wire1.receive();
#endif
Wire1.endTransmission();
}
/** Read multiple words from a 16-bit device register.
* @param useSPI true : use SPI
* @param devAddr I2C slave device address or Slave Select pin if SPI
* @param regAddr First register regAddr to read from
* @param length Number of words to read
* @param data Buffer to store read data in
* @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
* @return Number of words read (0 indicates failure)
*/
int8_t I2Cdev::readWords(bool useSPI, uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t *data, uint16_t timeout) {
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(useSPI ? "SPI (0x" : "I2C (0x");
Serial.print(devAddr, HEX);
Serial.print(") reading ");
Serial.print(length, DEC);
Serial.print(" words from 0x");
Serial.print(regAddr, HEX);
Serial.print("...");
#endif
int8_t count = 0;
Wire.beginTransmission(devAddr);
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
Wire.send(regAddr);
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
Wire.write(regAddr);
#endif
if (!useSPI) {
Wire.endTransmission();
Wire.beginTransmission(devAddr);
Wire.requestFrom(devAddr, (uint8_t)(length * 2)); // length=words, this wants bytes
uint32_t t1 = millis();
bool msb = true; // starts with MSB, then LSB
for (; Wire.available() && count < length && (timeout == 0 || millis() - t1 < timeout);) {
if (msb) {
// first byte is bits 15-8 (MSb=15)
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
data[count] = Wire.receive() << 8;
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
data[count] = Wire.read() << 8;
#endif
} else {
// second byte is bits 7-0 (LSb=0)
#if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
data[count] |= Wire.receive();
#elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
data[count] |= Wire.read();
#endif
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(data[count], HEX);
if (count + 1 < length) Serial.print(" ");
#endif
count++;
}
msb = !msb;
}
if (timeout > 0 && millis() - t1 >= timeout && count < length) count = -1; // timeout
Wire.endTransmission();
} else {
uint8_t _byteCnt = (uint8_t)(length * 2);
byte Addr = regAddr | 0x80;
digitalWrite(devAddr, LOW);
SPI.transfer(Addr);
bool msb = true;
for (uint8_t cnt=0; cnt < _byteCnt; cnt++) {
if (msb) {
data[cnt] = SPI.transfer(0) << 8;
}
else
{
data[cnt] |= SPI.transfer(0);
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(data[count], HEX);
if (count + 1 < length) Serial.print(" ");
#endif
count++;
}
msb = !msb;
}
digitalWrite(devAddr, HIGH);
}
#ifdef I2CDEV_SERIAL_DEBUG
Serial.print(". Done (");
Serial.print(count, DEC);
Serial.println(" read).");
#endif
return count;
}
