Library for Adafruit AMG8833. Forked from arduino version
Diff: AMG8833.cpp
- Revision:
- 0:9aaf1afdeac0
diff -r 000000000000 -r 9aaf1afdeac0 AMG8833.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/AMG8833.cpp Fri Jun 14 12:49:30 2019 +0000 @@ -0,0 +1,351 @@ +#include "AMG8833.h" + +//#define I2C_DEBUG + +/**************************************************************************/ +/*! + @brief Setups the I2C interface and hardware + @param addr Optional I2C address the sensor can be found on. Default is 0x69 + @returns True if device is set up, false on any failure +*/ +/**************************************************************************/ +Adafruit_AMG88xx::Adafruit_AMG88xx(PinName mysda, PinName myscl) : _i2c(mysda, myscl) +{ + +} + +int Adafruit_AMG88xx::begin(char addr) +{ + _i2caddr = addr; + + //enter normal mode + _pctl.PCTL = AMG88xx_NORMAL_MODE; + write8(AMG88xx_PCTL, _pctl.get()); + + //software reset + _rst.RST = AMG88xx_INITIAL_RESET; + write8(AMG88xx_RST, _rst.get()); + + //disable interrupts by default + disableInterrupt(); + + //set to 10 FPS + _fpsc.FPS = AMG88xx_FPS_10; + write8(AMG88xx_FPSC, _fpsc.get()); + + wait_ms(100); + + return 1; +} + +/**************************************************************************/ +/*! + @brief Set the moving average mode. + @param mode if True is passed, output will be twice the moving average +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::setMovingAverageMode(int mode) +{ + _ave.MAMOD = mode; + write8(AMG88xx_AVE, _ave.get()); +} + +/**************************************************************************/ +/*! + @brief Set the interrupt levels. The hysteresis value defaults to .95 * high + @param high the value above which an interrupt will be triggered + @param low the value below which an interrupt will be triggered +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::setInterruptLevels(float high, float low) +{ + setInterruptLevels(high, low, high * .95); +} + +/**************************************************************************/ +/*! + @brief Set the interrupt levels + @param high the value above which an interrupt will be triggered + @param low the value below which an interrupt will be triggered + @param hysteresis the hysteresis value for interrupt detection +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::setInterruptLevels(float high, float low, float hysteresis) +{ + int highConv = high / AMG88xx_PIXEL_TEMP_CONVERSION; + highConv = constrain(highConv, -4095, 4095); + _inthl.INT_LVL_H = highConv & 0xFF; + _inthh.INT_LVL_H = (highConv & 0xF) >> 4; + this->write8(AMG88xx_INTHL, _inthl.get()); + this->write8(AMG88xx_INTHH, _inthh.get()); + + int lowConv = low / AMG88xx_PIXEL_TEMP_CONVERSION; + lowConv = constrain(lowConv, -4095, 4095); + _intll.INT_LVL_L = lowConv & 0xFF; + _intlh.INT_LVL_L = (lowConv & 0xF) >> 4; + this->write8(AMG88xx_INTLL, _intll.get()); + this->write8(AMG88xx_INTLH, _intlh.get()); + + int hysConv = hysteresis / AMG88xx_PIXEL_TEMP_CONVERSION; + hysConv = constrain(hysConv, -4095, 4095); + _ihysl.INT_HYS = hysConv & 0xFF; + _ihysh.INT_HYS = (hysConv & 0xF) >> 4; + this->write8(AMG88xx_IHYSL, _ihysl.get()); + this->write8(AMG88xx_IHYSH, _ihysh.get()); +} + +/**************************************************************************/ +/*! + @brief enable the interrupt pin on the device. +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::enableInterrupt() +{ + _intc.INTEN = 1; + this->write8(AMG88xx_INTC, _intc.get()); +} + +/**************************************************************************/ +/*! + @brief disable the interrupt pin on the device +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::disableInterrupt() +{ + _intc.INTEN = 0; + this->write8(AMG88xx_INTC, _intc.get()); +} + +/**************************************************************************/ +/*! + @brief Set the interrupt to either absolute value or difference mode + @param mode passing AMG88xx_DIFFERENCE sets the device to difference mode, AMG88xx_ABSOLUTE_VALUE sets to absolute value mode. +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::setInterruptMode(uint8_t mode) +{ + _intc.INTMOD = mode; + this->write8(AMG88xx_INTC, _intc.get()); +} + +/**************************************************************************/ +/*! + @brief Read the state of the triggered interrupts on the device. The full interrupt register is 8 chars in length. + @param buf the pointer to where the returned data will be stored + @param size Optional number of chars to read. Default is 8 chars. + @returns up to 8 chars of data in buf +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::getInterrupt(uint8_t *buf, uint8_t size) +{ + uint8_t charsToRead = min(size, (uint8_t)8); + + this->read(AMG88xx_INT_OFFSET, buf, charsToRead); +} + +/**************************************************************************/ +/*! + @brief Clear any triggered interrupts +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::clearInterrupt() +{ + _rst.RST = AMG88xx_FLAG_RESET; + write8(AMG88xx_RST, _rst.get()); +} + +/**************************************************************************/ +/*! + @brief read the onboard thermistor + @returns a the floating point temperature in degrees Celsius +*/ +/**************************************************************************/ +float Adafruit_AMG88xx::readThermistor() +{ + uint8_t raw[2]; + this->read(AMG88xx_TTHL, raw, 2); + uint16_t recast = ((uint16_t) raw[1] << 8) | ((uint16_t) raw[0]); + + return signedMag12ToFloat(recast) * AMG88xx_THERMISTOR_CONVERSION; +} + +/**************************************************************************/ +/*! + @brief Read Infrared sensor values + @param buf the array to place the pixels in + @param size Optionsl number of chars to read (up to 64). Default is 64 chars. + @return up to 64 chars of pixel data in buf +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::readPixels(float *buf, uint8_t size) +{ + uint16_t recast; + float converted; + uint8_t charsToRead = min((uint8_t)(size << 1), (uint8_t)(AMG88xx_PIXEL_ARRAY_SIZE << 1)); + uint8_t rawArray[charsToRead]; + this->read(AMG88xx_PIXEL_OFFSET, rawArray, charsToRead); + + for(int i=0; i<size; i++){ + uint8_t pos = i << 1; + recast = ((uint16_t)rawArray[pos + 1] << 8) | ((uint16_t)rawArray[pos]); + + converted = int12ToFloat(recast) * AMG88xx_PIXEL_TEMP_CONVERSION; + buf[i] = converted; + } +} + +/**************************************************************************/ +/*! + @brief write one char of data to the specified register + @param reg the register to write to + @param value the value to write +*/ +/**************************************************************************/ +void Adafruit_AMG88xx::write8(uint8_t reg, uint8_t value) +{ + this->write(reg, &value, 1); +} + +/**************************************************************************/ +/*! + @brief read one char of data from the specified register + @param reg the register to read + @returns one char of register data +*/ +/**************************************************************************/ +uint8_t Adafruit_AMG88xx::read8(uint8_t reg) +{ + uint8_t ret; + this->read(reg, &ret, 1); + return ret; +} + +int Adafruit_AMG88xx::read(uint8_t reg, uint8_t *buf, uint8_t num) +{ +// char value; +// char pos = 0; + +// //on arduino we need to read in AMG_I2C_CHUNKSIZE char chunks +// while(pos < num){ +// char read_now = min((char)AMG_I2C_CHUNKSIZE, (char)(num - pos)); +// Wire.beginTransmission((char)_i2caddr); +// Wire.write((char)reg + pos); +// Wire.endTransmission(); +// Wire.requestFrom((char)_i2caddr, read_now); + +// #ifdef I2C_DEBUG +// Serial.print("[$"); Serial.print(reg + pos, HEX); Serial.print("] -> "); +// #endif +// for(int i=0; i<read_now; i++){ +// buf[pos] = Wire.read(); +// #ifdef I2C_DEBUG +// Serial.print("0x"); Serial.print(buf[pos], HEX); Serial.print(", "); +// #endif +// pos++; +// } +// #ifdef I2C_DEBUG +// Serial.println(); +// #endif +// } + char reg_dest = reg; + char rx_buf[num]; + int nack = _i2c.write(_i2caddr, ®_dest, 1, 1); // no stop + nack = _i2c.read(_i2caddr, rx_buf, num); + for (int i = 0; i < num; i++) { + buf[i] = (uint8_t) rx_buf[i]; + } + return nack; +} + +int Adafruit_AMG88xx::write(uint8_t reg, uint8_t *buf, uint8_t num) +{ +// #ifdef I2C_DEBUG + // Serial.print("[$"); Serial.print(reg, HEX); Serial.print("] <- "); +// #endif + // Wire.beginTransmission((char)_i2caddr); + // Wire.write((char)reg); + // for (int i=0; i<num; i++) { + // Wire.write(buf[i]); +// #ifdef I2C_DEBUG + // Serial.print("0x"); Serial.print(buf[i], HEX); Serial.print(", "); +// #endif + // } + // Wire.endTransmission(); +// #ifdef I2C_DEBUG + // Serial.println(); +// #endif + char reg_dest = reg; + char tx_buf[num]; + for (int i = 0; i < num; i++) { + tx_buf[i] = (char) buf[i]; + } + int nack = _i2c.write(_i2caddr, ®_dest, 1, 1); // no stop + nack = _i2c.write(_i2caddr, tx_buf, num); + return nack; +} + +/**************************************************************************/ +/*! + @brief convert a 12-bit signed magnitude value to a floating point number + @param val the 12-bit signed magnitude value to be converted + @returns the converted floating point value +*/ +/**************************************************************************/ +float Adafruit_AMG88xx::signedMag12ToFloat(uint16_t val) +{ + //take first 11 bits as absolute val + uint16_t absVal = (val & 0x7FF); + + return (val & 0x800) ? 0 - (float)absVal : (float)absVal ; +} + +/**************************************************************************/ +/*! + @brief convert a 12-bit integer two's complement value to a floating point number + @param val the 12-bit integer two's complement value to be converted + @returns the converted floating point value +*/ +/**************************************************************************/ +float Adafruit_AMG88xx::int12ToFloat(uint16_t val) +{ + uint16_t sVal = (val << 4); //shift to left so that sign bit of 12 bit integer number is placed on sign bit of 16 bit signed integer number + return sVal >> 4; //shift back the signed number, return converts to float +} + +/** + * @brief helper function, constraints the value + * @param value variable to be constrained + * @param min minimum value of the variable + */ +int Adafruit_AMG88xx::constrain(int value, int min, int max) +{ + if (value > max) { + return max; + } + else if (value < min) { + return min; + } + else { + return value; + } +} + +int Adafruit_AMG88xx::min(int val1, int val2) { + if (val1 < val2) return val1; + else return val2; +} + +int Adafruit_AMG88xx::max(int val1, int val2) { + if (val1 > val2) return val1; + else return val2; +} + +uint8_t Adafruit_AMG88xx::min(uint8_t val1, uint8_t val2) { + if (val1 < val2) return val1; + else return val2; +} + +uint8_t Adafruit_AMG88xx::max(uint8_t val1, uint8_t val2) { + if (val1 > val2) return val1; + else return val2; +} \ No newline at end of file