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196 lines (165 loc) · 4.63 KB
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#include "Microfire_Mod-ORP.h"
float Microfire::Mod_ORP::i2c::_tempC = -1;
float Microfire::Mod_ORP::i2c::_tempF = -1;
float Microfire::Mod_ORP::i2c::_mV = -1;
float Microfire::Mod_ORP::i2c::_calibrationSingleOffset = -1;
int Microfire::Mod_ORP::i2c::_hwVersion = -1;
int Microfire::Mod_ORP::i2c::_fwVersion = -1;
int Microfire::Mod_ORP::i2c::_status = -1;
namespace Microfire
{
namespace Mod_ORP
{
// Initializes library
bool i2c::begin(TwoWire &wirePort, uint8_t address)
{
_address = address;
_i2cPort = &wirePort;
return connected();
}
// Performs a single-point calibration.
float i2c::calibrateSingle(float solution_mV, bool blocking)
{
reset();
_write_4_bytes(MV_REGISTER, solution_mV);
_send_command(CALIBRATE_SINGLE_TASK);
if (blocking)
{
delay(ORP_MEASUREMENT_TIME);
}
getDeviceInfo();
return status;
}
// Returns true or false if the sensor is connected.
bool i2c::connected()
{
Wire.beginTransmission(_address);
uint8_t retval = Wire.endTransmission();
if (retval)
{
return false;
}
else
{
return true;
}
}
// Retrieves all the system information.
void i2c::getDeviceInfo()
{
_calibrationSingleOffset = _read_4_bytes(CALIBRATE_SINGLE_OFFSET_REGISTER);
_hwVersion = _read_byte(HW_VERSION_REGISTER);
_fwVersion = _read_byte(FW_VERSION_REGISTER);
_status = _read_byte(STATUS_REGISTER);
}
// Measures pH.
float i2c::measureORP(bool blocking)
{
_write_4_bytes(TEMP_C_REGISTER, tempC);
_send_command(MEASURE_ORP_TASK);
if (blocking)
delay(ORP_MEASUREMENT_TIME);
_updateRegisters();
return mV;
}
// Measures temperature using an optionally connected DS18B20 sensor
float i2c::measureTemp(bool blocking)
{
_send_command(MEASURE_TEMP_TASK);
if (blocking)
delay(ORP_TEMP_MEASURE_TIME);
_updateRegisters();
return tempC;
}
// Resets all system calibration information.
void i2c::reset()
{
_write_4_bytes(CALIBRATE_SINGLE_OFFSET_REGISTER, NAN);
}
// Writes system calibration information.
void i2c::setDeviceInfo(float calibrationSingleOffset)
{
_write_4_bytes(CALIBRATE_SINGLE_OFFSET_REGISTER, calibrationSingleOffset);
}
// Changes the I2C address.
void i2c::setI2CAddress(uint8_t i2cAddress)
{
_write_4_bytes(MV_REGISTER, i2cAddress);
_send_command(I2C_TASK);
_address = i2cAddress;
}
// If measurepH was called with blocking = true, this retrieves the latest pH measurement.
float i2c::update()
{
_updateRegisters();
return mV;
}
void i2c::_updateRegisters()
{
_status = _read_byte(STATUS_REGISTER);
_mV = _read_4_bytes(MV_REGISTER);
_tempC = _read_4_bytes(TEMP_C_REGISTER);
if (_tempC == -127.0)
{
_tempF = 0;
_tempC = 0;
}
else
{
_tempF = ((tempC * 9) / 5) + 32;
}
}
void i2c::_send_command(uint8_t command)
{
_i2cPort->beginTransmission(_address);
_i2cPort->write(TASK_REGISTER);
_i2cPort->write(command);
_i2cPort->endTransmission();
}
void i2c::_write_4_bytes(uint8_t reg, float f)
{
uint8_t b[5];
float f_val = f;
b[0] = reg;
b[1] = *((uint8_t *)&f_val);
b[2] = *((uint8_t *)&f_val + 1);
b[3] = *((uint8_t *)&f_val + 2);
b[4] = *((uint8_t *)&f_val + 3);
_i2cPort->beginTransmission(_address);
_i2cPort->write(b, 5);
_i2cPort->endTransmission();
}
float i2c::_read_4_bytes(uint8_t reg)
{
float retval;
_i2cPort->beginTransmission(_address);
_i2cPort->write(reg);
_i2cPort->endTransmission();
_i2cPort->requestFrom(_address, (uint8_t)4);
*((uint8_t *)&retval) = _i2cPort->read();
*((uint8_t *)&retval + 1) = _i2cPort->read();
*((uint8_t *)&retval + 2) = _i2cPort->read();
*((uint8_t *)&retval + 3) = _i2cPort->read();
return retval;
}
void i2c::_write_byte(uint8_t reg, uint8_t val)
{
uint8_t b[5];
b[0] = reg;
b[1] = val;
_i2cPort->beginTransmission(_address);
_i2cPort->write(b, 2);
_i2cPort->endTransmission();
}
uint8_t i2c::_read_byte(uint8_t reg)
{
uint8_t retval;
_i2cPort->beginTransmission(_address);
_i2cPort->write(reg);
_i2cPort->endTransmission();
_i2cPort->requestFrom(_address, (uint8_t)1);
retval = _i2cPort->read();
return retval;
}
} // namespace Mod_pH
} // namespace uFire