Lib
Dependents: ProjetLong_Serre_V3 ProjetLong_Serre_V3_1 AgroTech
Adafruit_TCS34725.cpp
- Committer:
- leandre
- Date:
- 2018-10-07
- Revision:
- 0:69073a593c65
File content as of revision 0:69073a593c65:
#include "Adafruit_TCS34725.h" /*example***************************************************************** #include "mbed.h" #include "Adafruit_TCS34725.h" #define commonAnode true I2C i2c(p28, p27); Adafruit_TCS34725 tcs = Adafruit_TCS34725(&i2c, TCS34725_INTEGRATIONTIME_50MS, TCS34725_GAIN_4X); int main() { char gammatable[256]; if (tcs.begin()) { printf("Found sensor"); } else { printf("No TCS34725 found ... check your connections"); while (1); // halt! } for (int i=0; i<256; i++) { float x = i; x /= 255; x = pow((double)x, 2.5); x *= 255; if (commonAnode) { gammatable[i] = 255 - x; } else { gammatable[i] = x; } printf("%d\r\n", gammatable[i]); } while(1) { uint16_t clear, red, green, blue; tcs.setInterrupt(false); // turn on LED tcs.getRawData(&red, &green, &blue, &clear); tcs.setInterrupt(true); // turn off LED printf("%d, %d, %d, %d\r\n", clear, red, green, blue); // Figure out some basic hex code for visualization uint32_t sum = clear; float r, g, b; r = red; r /= sum; g = green; g /= sum; b = blue; b /= sum; r *= 256; g *= 256; b *= 256; } } *************************************************************************/ void Adafruit_TCS34725::write8 (uint8_t reg, uint32_t value) { char data[2] = {TCS34725_COMMAND_BIT | reg, value & 0xFF}; _i2c->write(TCS34725_ADDRESS, data, 2); } uint8_t Adafruit_TCS34725::read8(uint8_t reg) { char data[2] = {TCS34725_COMMAND_BIT | reg, 0}; char r_data = 0; _i2c->write(TCS34725_ADDRESS, data, 1); _i2c->read(TCS34725_ADDRESS, &r_data, 1); return r_data; } uint16_t Adafruit_TCS34725::read16(uint8_t reg) { uint16_t x; uint16_t t; char data[2] = {TCS34725_COMMAND_BIT | reg, 0}; char r_data[2] = {}; _i2c->write(TCS34725_ADDRESS, data, 1); _i2c->read(TCS34725_ADDRESS, r_data, 2); t = r_data[0]; x = r_data[1]; x <<= 8; x |= t; return x; } void Adafruit_TCS34725::enable(void) { write8(TCS34725_ENABLE, TCS34725_ENABLE_PON); wait_ms(3); write8(TCS34725_ENABLE, TCS34725_ENABLE_PON | TCS34725_ENABLE_AEN); } void Adafruit_TCS34725::disable(void) { /* Turn the device off to save power */ uint8_t reg = 0; reg = read8(TCS34725_ENABLE); write8(TCS34725_ENABLE, reg & ~(TCS34725_ENABLE_PON | TCS34725_ENABLE_AEN)); } Adafruit_TCS34725::Adafruit_TCS34725(I2C *i2c, tcs34725IntegrationTime_t it, tcs34725Gain_t gain) { _i2c = i2c; _tcs34725Initialised = false; _tcs34725IntegrationTime = it; _tcs34725Gain = gain; } bool Adafruit_TCS34725::begin(void) { /* Make sure we're actually connected */ uint8_t x = read8(TCS34725_ID); //Serial.println(x, HEX); if (x != 0x44) { return false; } _tcs34725Initialised = true; /* Set default integration time and gain */ setIntegrationTime(_tcs34725IntegrationTime); setGain(_tcs34725Gain); /* Note: by default, the device is in power down mode on bootup */ enable(); return true; } void Adafruit_TCS34725::setIntegrationTime(tcs34725IntegrationTime_t it) { if (!_tcs34725Initialised) begin(); /* Update the timing register */ write8(TCS34725_ATIME, it); /* Update value placeholders */ _tcs34725IntegrationTime = it; } void Adafruit_TCS34725::setGain(tcs34725Gain_t gain) { if (!_tcs34725Initialised) begin(); /* Update the timing register */ write8(TCS34725_CONTROL, gain); /* Update value placeholders */ _tcs34725Gain = gain; } void Adafruit_TCS34725::getRawData (uint16_t *r, uint16_t *g, uint16_t *b, uint16_t *c) { if (!_tcs34725Initialised) begin(); *c = read16(TCS34725_CDATAL); *r = read16(TCS34725_RDATAL); *g = read16(TCS34725_GDATAL); *b = read16(TCS34725_BDATAL); /* Set a delay for the integration time */ switch (_tcs34725IntegrationTime) { case TCS34725_INTEGRATIONTIME_2_4MS: wait_ms(3); break; case TCS34725_INTEGRATIONTIME_24MS: wait_ms(24); break; case TCS34725_INTEGRATIONTIME_50MS: wait_ms(50); break; case TCS34725_INTEGRATIONTIME_101MS: wait_ms(101); break; case TCS34725_INTEGRATIONTIME_154MS: wait_ms(154); break; case TCS34725_INTEGRATIONTIME_700MS: wait_ms(700); break; } } uint16_t Adafruit_TCS34725::calculateColorTemperature(uint16_t r, uint16_t g, uint16_t b) { float X, Y, Z; /* RGB to XYZ correlation */ float xc, yc; /* Chromaticity co-ordinates */ float n; /* McCamy's formula */ float cct; /* 1. Map RGB values to their XYZ counterparts. */ /* Based on 6500K fluorescent, 3000K fluorescent */ /* and 60W incandescent values for a wide range. */ /* Note: Y = Illuminance or lux */ X = (-0.14282F * r) + (1.54924F * g) + (-0.95641F * b); Y = (-0.32466F * r) + (1.57837F * g) + (-0.73191F * b); Z = (-0.68202F * r) + (0.77073F * g) + ( 0.56332F * b); /* 2. Calculate the chromaticity co-ordinates */ xc = (X) / (X + Y + Z); yc = (Y) / (X + Y + Z); /* 3. Use McCamy's formula to determine the CCT */ n = (xc - 0.3320F) / (0.1858F - yc); /* Calculate the final CCT */ cct = (449.0F * powf(n, 3)) + (3525.0F * powf(n, 2)) + (6823.3F * n) + 5520.33F; /* Return the results in degrees Kelvin */ return (uint16_t)cct; } uint16_t Adafruit_TCS34725::calculateLux(uint16_t r, uint16_t g, uint16_t b) { float illuminance; /* This only uses RGB ... how can we integrate clear or calculate lux */ /* based exclusively on clear since this might be more reliable? */ illuminance = (-0.32466F * r) + (1.57837F * g) + (-0.73191F * b); return (uint16_t)illuminance; } void Adafruit_TCS34725::setInterrupt(bool i) { uint8_t r = read8(TCS34725_ENABLE); if (i) { r |= TCS34725_ENABLE_AIEN; } else { r &= ~TCS34725_ENABLE_AIEN; } write8(TCS34725_ENABLE, r); } void Adafruit_TCS34725::clearInterrupt(void) { char data[2] = {0x66, 0}; _i2c->write(TCS34725_ADDRESS, data, 1); } void Adafruit_TCS34725::setIntLimits(uint16_t low, uint16_t high) { write8(0x04, low & 0xFF); write8(0x05, low >> 8); write8(0x06, high & 0xFF); write8(0x07, high >> 8); }