hisyam fs / AMG8833lib

Library for Adafruit AMG8833. Forked from arduino version

Dependents:   AMG3x3

AMG8833.cpp@0:9aaf1afdeac0, 2019-06-14 (annotated)

Committer:
hisyamfs
Date:
Fri Jun 14 12:49:30 2019 +0000
Revision:
0:9aaf1afdeac0
okey;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hisyamfs 0:9aaf1afdeac0 1 #include "AMG8833.h"
hisyamfs 0:9aaf1afdeac0 2
hisyamfs 0:9aaf1afdeac0 3 //#define I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 4
hisyamfs 0:9aaf1afdeac0 5 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 6 /*!
hisyamfs 0:9aaf1afdeac0 7 @brief Setups the I2C interface and hardware
hisyamfs 0:9aaf1afdeac0 8 @param addr Optional I2C address the sensor can be found on. Default is 0x69
hisyamfs 0:9aaf1afdeac0 9 @returns True if device is set up, false on any failure
hisyamfs 0:9aaf1afdeac0 10 */
hisyamfs 0:9aaf1afdeac0 11 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 12 Adafruit_AMG88xx::Adafruit_AMG88xx(PinName mysda, PinName myscl) : _i2c(mysda, myscl)
hisyamfs 0:9aaf1afdeac0 13 {
hisyamfs 0:9aaf1afdeac0 14
hisyamfs 0:9aaf1afdeac0 15 }
hisyamfs 0:9aaf1afdeac0 16
hisyamfs 0:9aaf1afdeac0 17 int Adafruit_AMG88xx::begin(char addr)
hisyamfs 0:9aaf1afdeac0 18 {
hisyamfs 0:9aaf1afdeac0 19 _i2caddr = addr;
hisyamfs 0:9aaf1afdeac0 20
hisyamfs 0:9aaf1afdeac0 21 //enter normal mode
hisyamfs 0:9aaf1afdeac0 22 _pctl.PCTL = AMG88xx_NORMAL_MODE;
hisyamfs 0:9aaf1afdeac0 23 write8(AMG88xx_PCTL, _pctl.get());
hisyamfs 0:9aaf1afdeac0 24
hisyamfs 0:9aaf1afdeac0 25 //software reset
hisyamfs 0:9aaf1afdeac0 26 _rst.RST = AMG88xx_INITIAL_RESET;
hisyamfs 0:9aaf1afdeac0 27 write8(AMG88xx_RST, _rst.get());
hisyamfs 0:9aaf1afdeac0 28
hisyamfs 0:9aaf1afdeac0 29 //disable interrupts by default
hisyamfs 0:9aaf1afdeac0 30 disableInterrupt();
hisyamfs 0:9aaf1afdeac0 31
hisyamfs 0:9aaf1afdeac0 32 //set to 10 FPS
hisyamfs 0:9aaf1afdeac0 33 _fpsc.FPS = AMG88xx_FPS_10;
hisyamfs 0:9aaf1afdeac0 34 write8(AMG88xx_FPSC, _fpsc.get());
hisyamfs 0:9aaf1afdeac0 35
hisyamfs 0:9aaf1afdeac0 36 wait_ms(100);
hisyamfs 0:9aaf1afdeac0 37
hisyamfs 0:9aaf1afdeac0 38 return 1;
hisyamfs 0:9aaf1afdeac0 39 }
hisyamfs 0:9aaf1afdeac0 40
hisyamfs 0:9aaf1afdeac0 41 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 42 /*!
hisyamfs 0:9aaf1afdeac0 43 @brief Set the moving average mode.
hisyamfs 0:9aaf1afdeac0 44 @param mode if True is passed, output will be twice the moving average
hisyamfs 0:9aaf1afdeac0 45 */
hisyamfs 0:9aaf1afdeac0 46 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 47 void Adafruit_AMG88xx::setMovingAverageMode(int mode)
hisyamfs 0:9aaf1afdeac0 48 {
hisyamfs 0:9aaf1afdeac0 49 _ave.MAMOD = mode;
hisyamfs 0:9aaf1afdeac0 50 write8(AMG88xx_AVE, _ave.get());
hisyamfs 0:9aaf1afdeac0 51 }
hisyamfs 0:9aaf1afdeac0 52
hisyamfs 0:9aaf1afdeac0 53 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 54 /*!
hisyamfs 0:9aaf1afdeac0 55 @brief Set the interrupt levels. The hysteresis value defaults to .95 * high
hisyamfs 0:9aaf1afdeac0 56 @param high the value above which an interrupt will be triggered
hisyamfs 0:9aaf1afdeac0 57 @param low the value below which an interrupt will be triggered
hisyamfs 0:9aaf1afdeac0 58 */
hisyamfs 0:9aaf1afdeac0 59 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 60 void Adafruit_AMG88xx::setInterruptLevels(float high, float low)
hisyamfs 0:9aaf1afdeac0 61 {
hisyamfs 0:9aaf1afdeac0 62 setInterruptLevels(high, low, high * .95);
hisyamfs 0:9aaf1afdeac0 63 }
hisyamfs 0:9aaf1afdeac0 64
hisyamfs 0:9aaf1afdeac0 65 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 66 /*!
hisyamfs 0:9aaf1afdeac0 67 @brief Set the interrupt levels
hisyamfs 0:9aaf1afdeac0 68 @param high the value above which an interrupt will be triggered
hisyamfs 0:9aaf1afdeac0 69 @param low the value below which an interrupt will be triggered
hisyamfs 0:9aaf1afdeac0 70 @param hysteresis the hysteresis value for interrupt detection
hisyamfs 0:9aaf1afdeac0 71 */
hisyamfs 0:9aaf1afdeac0 72 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 73 void Adafruit_AMG88xx::setInterruptLevels(float high, float low, float hysteresis)
hisyamfs 0:9aaf1afdeac0 74 {
hisyamfs 0:9aaf1afdeac0 75 int highConv = high / AMG88xx_PIXEL_TEMP_CONVERSION;
hisyamfs 0:9aaf1afdeac0 76 highConv = constrain(highConv, -4095, 4095);
hisyamfs 0:9aaf1afdeac0 77 _inthl.INT_LVL_H = highConv & 0xFF;
hisyamfs 0:9aaf1afdeac0 78 _inthh.INT_LVL_H = (highConv & 0xF) >> 4;
hisyamfs 0:9aaf1afdeac0 79 this->write8(AMG88xx_INTHL, _inthl.get());
hisyamfs 0:9aaf1afdeac0 80 this->write8(AMG88xx_INTHH, _inthh.get());
hisyamfs 0:9aaf1afdeac0 81
hisyamfs 0:9aaf1afdeac0 82 int lowConv = low / AMG88xx_PIXEL_TEMP_CONVERSION;
hisyamfs 0:9aaf1afdeac0 83 lowConv = constrain(lowConv, -4095, 4095);
hisyamfs 0:9aaf1afdeac0 84 _intll.INT_LVL_L = lowConv & 0xFF;
hisyamfs 0:9aaf1afdeac0 85 _intlh.INT_LVL_L = (lowConv & 0xF) >> 4;
hisyamfs 0:9aaf1afdeac0 86 this->write8(AMG88xx_INTLL, _intll.get());
hisyamfs 0:9aaf1afdeac0 87 this->write8(AMG88xx_INTLH, _intlh.get());
hisyamfs 0:9aaf1afdeac0 88
hisyamfs 0:9aaf1afdeac0 89 int hysConv = hysteresis / AMG88xx_PIXEL_TEMP_CONVERSION;
hisyamfs 0:9aaf1afdeac0 90 hysConv = constrain(hysConv, -4095, 4095);
hisyamfs 0:9aaf1afdeac0 91 _ihysl.INT_HYS = hysConv & 0xFF;
hisyamfs 0:9aaf1afdeac0 92 _ihysh.INT_HYS = (hysConv & 0xF) >> 4;
hisyamfs 0:9aaf1afdeac0 93 this->write8(AMG88xx_IHYSL, _ihysl.get());
hisyamfs 0:9aaf1afdeac0 94 this->write8(AMG88xx_IHYSH, _ihysh.get());
hisyamfs 0:9aaf1afdeac0 95 }
hisyamfs 0:9aaf1afdeac0 96
hisyamfs 0:9aaf1afdeac0 97 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 98 /*!
hisyamfs 0:9aaf1afdeac0 99 @brief enable the interrupt pin on the device.
hisyamfs 0:9aaf1afdeac0 100 */
hisyamfs 0:9aaf1afdeac0 101 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 102 void Adafruit_AMG88xx::enableInterrupt()
hisyamfs 0:9aaf1afdeac0 103 {
hisyamfs 0:9aaf1afdeac0 104 _intc.INTEN = 1;
hisyamfs 0:9aaf1afdeac0 105 this->write8(AMG88xx_INTC, _intc.get());
hisyamfs 0:9aaf1afdeac0 106 }
hisyamfs 0:9aaf1afdeac0 107
hisyamfs 0:9aaf1afdeac0 108 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 109 /*!
hisyamfs 0:9aaf1afdeac0 110 @brief disable the interrupt pin on the device
hisyamfs 0:9aaf1afdeac0 111 */
hisyamfs 0:9aaf1afdeac0 112 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 113 void Adafruit_AMG88xx::disableInterrupt()
hisyamfs 0:9aaf1afdeac0 114 {
hisyamfs 0:9aaf1afdeac0 115 _intc.INTEN = 0;
hisyamfs 0:9aaf1afdeac0 116 this->write8(AMG88xx_INTC, _intc.get());
hisyamfs 0:9aaf1afdeac0 117 }
hisyamfs 0:9aaf1afdeac0 118
hisyamfs 0:9aaf1afdeac0 119 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 120 /*!
hisyamfs 0:9aaf1afdeac0 121 @brief Set the interrupt to either absolute value or difference mode
hisyamfs 0:9aaf1afdeac0 122 @param mode passing AMG88xx_DIFFERENCE sets the device to difference mode, AMG88xx_ABSOLUTE_VALUE sets to absolute value mode.
hisyamfs 0:9aaf1afdeac0 123 */
hisyamfs 0:9aaf1afdeac0 124 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 125 void Adafruit_AMG88xx::setInterruptMode(uint8_t mode)
hisyamfs 0:9aaf1afdeac0 126 {
hisyamfs 0:9aaf1afdeac0 127 _intc.INTMOD = mode;
hisyamfs 0:9aaf1afdeac0 128 this->write8(AMG88xx_INTC, _intc.get());
hisyamfs 0:9aaf1afdeac0 129 }
hisyamfs 0:9aaf1afdeac0 130
hisyamfs 0:9aaf1afdeac0 131 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 132 /*!
hisyamfs 0:9aaf1afdeac0 133 @brief Read the state of the triggered interrupts on the device. The full interrupt register is 8 chars in length.
hisyamfs 0:9aaf1afdeac0 134 @param buf the pointer to where the returned data will be stored
hisyamfs 0:9aaf1afdeac0 135 @param size Optional number of chars to read. Default is 8 chars.
hisyamfs 0:9aaf1afdeac0 136 @returns up to 8 chars of data in buf
hisyamfs 0:9aaf1afdeac0 137 */
hisyamfs 0:9aaf1afdeac0 138 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 139 void Adafruit_AMG88xx::getInterrupt(uint8_t *buf, uint8_t size)
hisyamfs 0:9aaf1afdeac0 140 {
hisyamfs 0:9aaf1afdeac0 141 uint8_t charsToRead = min(size, (uint8_t)8);
hisyamfs 0:9aaf1afdeac0 142
hisyamfs 0:9aaf1afdeac0 143 this->read(AMG88xx_INT_OFFSET, buf, charsToRead);
hisyamfs 0:9aaf1afdeac0 144 }
hisyamfs 0:9aaf1afdeac0 145
hisyamfs 0:9aaf1afdeac0 146 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 147 /*!
hisyamfs 0:9aaf1afdeac0 148 @brief Clear any triggered interrupts
hisyamfs 0:9aaf1afdeac0 149 */
hisyamfs 0:9aaf1afdeac0 150 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 151 void Adafruit_AMG88xx::clearInterrupt()
hisyamfs 0:9aaf1afdeac0 152 {
hisyamfs 0:9aaf1afdeac0 153 _rst.RST = AMG88xx_FLAG_RESET;
hisyamfs 0:9aaf1afdeac0 154 write8(AMG88xx_RST, _rst.get());
hisyamfs 0:9aaf1afdeac0 155 }
hisyamfs 0:9aaf1afdeac0 156
hisyamfs 0:9aaf1afdeac0 157 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 158 /*!
hisyamfs 0:9aaf1afdeac0 159 @brief read the onboard thermistor
hisyamfs 0:9aaf1afdeac0 160 @returns a the floating point temperature in degrees Celsius
hisyamfs 0:9aaf1afdeac0 161 */
hisyamfs 0:9aaf1afdeac0 162 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 163 float Adafruit_AMG88xx::readThermistor()
hisyamfs 0:9aaf1afdeac0 164 {
hisyamfs 0:9aaf1afdeac0 165 uint8_t raw[2];
hisyamfs 0:9aaf1afdeac0 166 this->read(AMG88xx_TTHL, raw, 2);
hisyamfs 0:9aaf1afdeac0 167 uint16_t recast = ((uint16_t) raw[1] << 8) | ((uint16_t) raw[0]);
hisyamfs 0:9aaf1afdeac0 168
hisyamfs 0:9aaf1afdeac0 169 return signedMag12ToFloat(recast) * AMG88xx_THERMISTOR_CONVERSION;
hisyamfs 0:9aaf1afdeac0 170 }
hisyamfs 0:9aaf1afdeac0 171
hisyamfs 0:9aaf1afdeac0 172 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 173 /*!
hisyamfs 0:9aaf1afdeac0 174 @brief Read Infrared sensor values
hisyamfs 0:9aaf1afdeac0 175 @param buf the array to place the pixels in
hisyamfs 0:9aaf1afdeac0 176 @param size Optionsl number of chars to read (up to 64). Default is 64 chars.
hisyamfs 0:9aaf1afdeac0 177 @return up to 64 chars of pixel data in buf
hisyamfs 0:9aaf1afdeac0 178 */
hisyamfs 0:9aaf1afdeac0 179 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 180 void Adafruit_AMG88xx::readPixels(float *buf, uint8_t size)
hisyamfs 0:9aaf1afdeac0 181 {
hisyamfs 0:9aaf1afdeac0 182 uint16_t recast;
hisyamfs 0:9aaf1afdeac0 183 float converted;
hisyamfs 0:9aaf1afdeac0 184 uint8_t charsToRead = min((uint8_t)(size << 1), (uint8_t)(AMG88xx_PIXEL_ARRAY_SIZE << 1));
hisyamfs 0:9aaf1afdeac0 185 uint8_t rawArray[charsToRead];
hisyamfs 0:9aaf1afdeac0 186 this->read(AMG88xx_PIXEL_OFFSET, rawArray, charsToRead);
hisyamfs 0:9aaf1afdeac0 187
hisyamfs 0:9aaf1afdeac0 188 for(int i=0; i<size; i++){
hisyamfs 0:9aaf1afdeac0 189 uint8_t pos = i << 1;
hisyamfs 0:9aaf1afdeac0 190 recast = ((uint16_t)rawArray[pos + 1] << 8) | ((uint16_t)rawArray[pos]);
hisyamfs 0:9aaf1afdeac0 191
hisyamfs 0:9aaf1afdeac0 192 converted = int12ToFloat(recast) * AMG88xx_PIXEL_TEMP_CONVERSION;
hisyamfs 0:9aaf1afdeac0 193 buf[i] = converted;
hisyamfs 0:9aaf1afdeac0 194 }
hisyamfs 0:9aaf1afdeac0 195 }
hisyamfs 0:9aaf1afdeac0 196
hisyamfs 0:9aaf1afdeac0 197 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 198 /*!
hisyamfs 0:9aaf1afdeac0 199 @brief write one char of data to the specified register
hisyamfs 0:9aaf1afdeac0 200 @param reg the register to write to
hisyamfs 0:9aaf1afdeac0 201 @param value the value to write
hisyamfs 0:9aaf1afdeac0 202 */
hisyamfs 0:9aaf1afdeac0 203 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 204 void Adafruit_AMG88xx::write8(uint8_t reg, uint8_t value)
hisyamfs 0:9aaf1afdeac0 205 {
hisyamfs 0:9aaf1afdeac0 206 this->write(reg, &value, 1);
hisyamfs 0:9aaf1afdeac0 207 }
hisyamfs 0:9aaf1afdeac0 208
hisyamfs 0:9aaf1afdeac0 209 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 210 /*!
hisyamfs 0:9aaf1afdeac0 211 @brief read one char of data from the specified register
hisyamfs 0:9aaf1afdeac0 212 @param reg the register to read
hisyamfs 0:9aaf1afdeac0 213 @returns one char of register data
hisyamfs 0:9aaf1afdeac0 214 */
hisyamfs 0:9aaf1afdeac0 215 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 216 uint8_t Adafruit_AMG88xx::read8(uint8_t reg)
hisyamfs 0:9aaf1afdeac0 217 {
hisyamfs 0:9aaf1afdeac0 218 uint8_t ret;
hisyamfs 0:9aaf1afdeac0 219 this->read(reg, &ret, 1);
hisyamfs 0:9aaf1afdeac0 220 return ret;
hisyamfs 0:9aaf1afdeac0 221 }
hisyamfs 0:9aaf1afdeac0 222
hisyamfs 0:9aaf1afdeac0 223 int Adafruit_AMG88xx::read(uint8_t reg, uint8_t *buf, uint8_t num)
hisyamfs 0:9aaf1afdeac0 224 {
hisyamfs 0:9aaf1afdeac0 225 // char value;
hisyamfs 0:9aaf1afdeac0 226 // char pos = 0;
hisyamfs 0:9aaf1afdeac0 227
hisyamfs 0:9aaf1afdeac0 228 // //on arduino we need to read in AMG_I2C_CHUNKSIZE char chunks
hisyamfs 0:9aaf1afdeac0 229 // while(pos < num){
hisyamfs 0:9aaf1afdeac0 230 // char read_now = min((char)AMG_I2C_CHUNKSIZE, (char)(num - pos));
hisyamfs 0:9aaf1afdeac0 231 // Wire.beginTransmission((char)_i2caddr);
hisyamfs 0:9aaf1afdeac0 232 // Wire.write((char)reg + pos);
hisyamfs 0:9aaf1afdeac0 233 // Wire.endTransmission();
hisyamfs 0:9aaf1afdeac0 234 // Wire.requestFrom((char)_i2caddr, read_now);
hisyamfs 0:9aaf1afdeac0 235
hisyamfs 0:9aaf1afdeac0 236 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 237 // Serial.print("[$"); Serial.print(reg + pos, HEX); Serial.print("] -> ");
hisyamfs 0:9aaf1afdeac0 238 // #endif
hisyamfs 0:9aaf1afdeac0 239 // for(int i=0; i<read_now; i++){
hisyamfs 0:9aaf1afdeac0 240 // buf[pos] = Wire.read();
hisyamfs 0:9aaf1afdeac0 241 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 242 // Serial.print("0x"); Serial.print(buf[pos], HEX); Serial.print(", ");
hisyamfs 0:9aaf1afdeac0 243 // #endif
hisyamfs 0:9aaf1afdeac0 244 // pos++;
hisyamfs 0:9aaf1afdeac0 245 // }
hisyamfs 0:9aaf1afdeac0 246 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 247 // Serial.println();
hisyamfs 0:9aaf1afdeac0 248 // #endif
hisyamfs 0:9aaf1afdeac0 249 // }
hisyamfs 0:9aaf1afdeac0 250 char reg_dest = reg;
hisyamfs 0:9aaf1afdeac0 251 char rx_buf[num];
hisyamfs 0:9aaf1afdeac0 252 int nack = _i2c.write(_i2caddr, &reg_dest, 1, 1); // no stop
hisyamfs 0:9aaf1afdeac0 253 nack = _i2c.read(_i2caddr, rx_buf, num);
hisyamfs 0:9aaf1afdeac0 254 for (int i = 0; i < num; i++) {
hisyamfs 0:9aaf1afdeac0 255 buf[i] = (uint8_t) rx_buf[i];
hisyamfs 0:9aaf1afdeac0 256 }
hisyamfs 0:9aaf1afdeac0 257 return nack;
hisyamfs 0:9aaf1afdeac0 258 }
hisyamfs 0:9aaf1afdeac0 259
hisyamfs 0:9aaf1afdeac0 260 int Adafruit_AMG88xx::write(uint8_t reg, uint8_t *buf, uint8_t num)
hisyamfs 0:9aaf1afdeac0 261 {
hisyamfs 0:9aaf1afdeac0 262 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 263 // Serial.print("[$"); Serial.print(reg, HEX); Serial.print("] <- ");
hisyamfs 0:9aaf1afdeac0 264 // #endif
hisyamfs 0:9aaf1afdeac0 265 // Wire.beginTransmission((char)_i2caddr);
hisyamfs 0:9aaf1afdeac0 266 // Wire.write((char)reg);
hisyamfs 0:9aaf1afdeac0 267 // for (int i=0; i<num; i++) {
hisyamfs 0:9aaf1afdeac0 268 // Wire.write(buf[i]);
hisyamfs 0:9aaf1afdeac0 269 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 270 // Serial.print("0x"); Serial.print(buf[i], HEX); Serial.print(", ");
hisyamfs 0:9aaf1afdeac0 271 // #endif
hisyamfs 0:9aaf1afdeac0 272 // }
hisyamfs 0:9aaf1afdeac0 273 // Wire.endTransmission();
hisyamfs 0:9aaf1afdeac0 274 // #ifdef I2C_DEBUG
hisyamfs 0:9aaf1afdeac0 275 // Serial.println();
hisyamfs 0:9aaf1afdeac0 276 // #endif
hisyamfs 0:9aaf1afdeac0 277 char reg_dest = reg;
hisyamfs 0:9aaf1afdeac0 278 char tx_buf[num];
hisyamfs 0:9aaf1afdeac0 279 for (int i = 0; i < num; i++) {
hisyamfs 0:9aaf1afdeac0 280 tx_buf[i] = (char) buf[i];
hisyamfs 0:9aaf1afdeac0 281 }
hisyamfs 0:9aaf1afdeac0 282 int nack = _i2c.write(_i2caddr, &reg_dest, 1, 1); // no stop
hisyamfs 0:9aaf1afdeac0 283 nack = _i2c.write(_i2caddr, tx_buf, num);
hisyamfs 0:9aaf1afdeac0 284 return nack;
hisyamfs 0:9aaf1afdeac0 285 }
hisyamfs 0:9aaf1afdeac0 286
hisyamfs 0:9aaf1afdeac0 287 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 288 /*!
hisyamfs 0:9aaf1afdeac0 289 @brief convert a 12-bit signed magnitude value to a floating point number
hisyamfs 0:9aaf1afdeac0 290 @param val the 12-bit signed magnitude value to be converted
hisyamfs 0:9aaf1afdeac0 291 @returns the converted floating point value
hisyamfs 0:9aaf1afdeac0 292 */
hisyamfs 0:9aaf1afdeac0 293 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 294 float Adafruit_AMG88xx::signedMag12ToFloat(uint16_t val)
hisyamfs 0:9aaf1afdeac0 295 {
hisyamfs 0:9aaf1afdeac0 296 //take first 11 bits as absolute val
hisyamfs 0:9aaf1afdeac0 297 uint16_t absVal = (val & 0x7FF);
hisyamfs 0:9aaf1afdeac0 298
hisyamfs 0:9aaf1afdeac0 299 return (val & 0x800) ? 0 - (float)absVal : (float)absVal ;
hisyamfs 0:9aaf1afdeac0 300 }
hisyamfs 0:9aaf1afdeac0 301
hisyamfs 0:9aaf1afdeac0 302 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 303 /*!
hisyamfs 0:9aaf1afdeac0 304 @brief convert a 12-bit integer two's complement value to a floating point number
hisyamfs 0:9aaf1afdeac0 305 @param val the 12-bit integer two's complement value to be converted
hisyamfs 0:9aaf1afdeac0 306 @returns the converted floating point value
hisyamfs 0:9aaf1afdeac0 307 */
hisyamfs 0:9aaf1afdeac0 308 /**************************************************************************/
hisyamfs 0:9aaf1afdeac0 309 float Adafruit_AMG88xx::int12ToFloat(uint16_t val)
hisyamfs 0:9aaf1afdeac0 310 {
hisyamfs 0:9aaf1afdeac0 311 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
hisyamfs 0:9aaf1afdeac0 312 return sVal >> 4; //shift back the signed number, return converts to float
hisyamfs 0:9aaf1afdeac0 313 }
hisyamfs 0:9aaf1afdeac0 314
hisyamfs 0:9aaf1afdeac0 315 /**
hisyamfs 0:9aaf1afdeac0 316 * @brief helper function, constraints the value
hisyamfs 0:9aaf1afdeac0 317 * @param value variable to be constrained
hisyamfs 0:9aaf1afdeac0 318 * @param min minimum value of the variable
hisyamfs 0:9aaf1afdeac0 319 */
hisyamfs 0:9aaf1afdeac0 320 int Adafruit_AMG88xx::constrain(int value, int min, int max)
hisyamfs 0:9aaf1afdeac0 321 {
hisyamfs 0:9aaf1afdeac0 322 if (value > max) {
hisyamfs 0:9aaf1afdeac0 323 return max;
hisyamfs 0:9aaf1afdeac0 324 }
hisyamfs 0:9aaf1afdeac0 325 else if (value < min) {
hisyamfs 0:9aaf1afdeac0 326 return min;
hisyamfs 0:9aaf1afdeac0 327 }
hisyamfs 0:9aaf1afdeac0 328 else {
hisyamfs 0:9aaf1afdeac0 329 return value;
hisyamfs 0:9aaf1afdeac0 330 }
hisyamfs 0:9aaf1afdeac0 331 }
hisyamfs 0:9aaf1afdeac0 332
hisyamfs 0:9aaf1afdeac0 333 int Adafruit_AMG88xx::min(int val1, int val2) {
hisyamfs 0:9aaf1afdeac0 334 if (val1 < val2) return val1;
hisyamfs 0:9aaf1afdeac0 335 else return val2;
hisyamfs 0:9aaf1afdeac0 336 }
hisyamfs 0:9aaf1afdeac0 337
hisyamfs 0:9aaf1afdeac0 338 int Adafruit_AMG88xx::max(int val1, int val2) {
hisyamfs 0:9aaf1afdeac0 339 if (val1 > val2) return val1;
hisyamfs 0:9aaf1afdeac0 340 else return val2;
hisyamfs 0:9aaf1afdeac0 341 }
hisyamfs 0:9aaf1afdeac0 342
hisyamfs 0:9aaf1afdeac0 343 uint8_t Adafruit_AMG88xx::min(uint8_t val1, uint8_t val2) {
hisyamfs 0:9aaf1afdeac0 344 if (val1 < val2) return val1;
hisyamfs 0:9aaf1afdeac0 345 else return val2;
hisyamfs 0:9aaf1afdeac0 346 }
hisyamfs 0:9aaf1afdeac0 347
hisyamfs 0:9aaf1afdeac0 348 uint8_t Adafruit_AMG88xx::max(uint8_t val1, uint8_t val2) {
hisyamfs 0:9aaf1afdeac0 349 if (val1 > val2) return val1;
hisyamfs 0:9aaf1afdeac0 350 else return val2;
hisyamfs 0:9aaf1afdeac0 351 }