Diff: AMG8833/AMG8833.cpp

Revision:

42:3b682b7d0388

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AMG8833/AMG8833.cpp	Mon Feb 11 12:49:36 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("[$"); Serial.print(reg + pos, HEX); Serial.print("] -> ");
+// #endif
+//      for(int i=0; i<read_now; i++){
+//          buf[pos] = Wire.read();
+// #ifdef I2C_DEBUG
+//          Serial.print("0x"); Serial.print(buf[pos], HEX); Serial.print(", ");
+// #endif
+//          pos++;
+//      }
+// #ifdef I2C_DEBUG
+//      Serial.println();
+// #endif
+//  }
+    char reg_dest = reg;
+    char rx_buf[num];
+    int nack = _i2c.write(_i2caddr, &reg_dest, 1, 1); // no stop
+    nack = _i2c.read(_i2caddr, rx_buf, num);
+    for (int i = 0; i < num; i++) {
+        buf[i] = (uint8_t) rx_buf[i];
+    }
+    return nack;
+}
+
+int Adafruit_AMG88xx::write(uint8_t reg, uint8_t *buf, uint8_t num)
+{
+// #ifdef I2C_DEBUG
+        // Serial.print("[$"); 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, &reg_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;
+}
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