Vishay VEML6040 Color RGB sensor I2C driver library
Dependents: test_VEML6040 testSensor
VEML6040.cpp
- Committer:
- Rhyme
- Date:
- 2017-05-19
- Revision:
- 2:239c3561d21a
- Parent:
- 1:5540b216acfc
- Child:
- 4:f5b142e3fe79
File content as of revision 2:239c3561d21a:
/* * File description here */ #include "VEML6040.h" /* VEML6075 SLAVE ADDRESS AND FUNCTION DESCRIPTION */ #define REG_COLOR_CONF 0x00 #define REG_Reserved1 0x01 #define REG_Reserved2 0x02 #define REG_Reserved3 0x03 #define REG_Reserved4 0x04 #define REG_Reserved5 0x05 #define REG_Reserved6 0x06 #define REG_Reserved7 0x07 #define REG_R_Data 0x08 #define REG_G_Data 0x09 #define REG_B_Data 0x0A #define REG_W_Data 0x0B // Following magic numbers are from // VISHAY veml6040 Application Note 84331 // Page 4 #define LUX_RESOLUTION_0 (0.25168) #define LUX_RESOLUTION_1 (0.12584) #define LUX_RESOLUTION_2 (0.06292) #define LUX_RESOLUTION_3 (0.03146) #define LUX_RESOLUTION_4 (0.01573) #define LUX_RESOLUTION_5 (0.007865) // Following magic numbers are from // VISHAY veml6040 Application Note 84331 // Page 9 #define CORR_COEFF_M0 (0.048403) #define CORR_COEFF_M1 (0.183633) #define CORR_COEFF_M2 (-0.253589) #define CORR_COEFF_M3 (0.022916) #define CORR_COEFF_M4 (0.176388) #define CORR_COEFF_M5 (-0.183205) #define CORR_COEFF_M6 (-0.077436) #define CORR_COEFF_M7 (0.124541) #define CORR_COEFF_M8 (0.032081) // Following magic numbers are from // VISHAY veml6040 Application Note 84331 // Page 10 #define CCT_CONST (4278.6) #define OFFSET_OPEN_AIR (0.5) VEML6040::VEML6040(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) { // activate the peripheral } VEML6040::~VEML6040() { } #if 0 // // numdata is supposed to be 2 // void VEML6040::cmdWrite(uint8_t cmd, uint8_t *data, uint8_t numdata) { uint8_t buf[3] ; buf[0] = cmd ; buf[1] = data[0] ; buf[2] = data[1] ; writeRegs(buf, 3) ; } // // numdata is supposed to be 2 // void VEML6040::cmdRead(uint8_t cmd, uint8_t *data, uint8_t numdata) { uint8_t buf[1] ; buf[0] = cmd ; m_i2c.write(m_addr, buf, 1, true) ; // writing command m_i2c.read(m_addr, (char*)data, numdata) ; } #endif void VEML6040::getCOLORConf(uint8_t *colorconf) { uint8_t data[2] ; readRegs(REG_COLOR_CONF, data, 2) ; *colorconf = data[0] ; } void VEML6040::setCOLORConf(uint8_t colorconf) { uint8_t data[3] ; data[0] = REG_COLOR_CONF ; data[1] = colorconf ; data[2] = 0 ; writeRegs(data, 3) ; } void VEML6040::getRData(uint16_t *rdata) { uint8_t data[2] ; readRegs(REG_R_Data, data, 2) ; *rdata = (data[1]<<8) | data[0] ; } void VEML6040::getGData(uint16_t *gdata) { uint8_t data[2] ; readRegs(REG_G_Data, data, 2) ; *gdata = (data[1]<<8) | data[0] ; } void VEML6040::getBData(uint16_t *bdata) { uint8_t data[2] ; readRegs(REG_B_Data, data, 2) ; *bdata = (data[1]<<8) | data[0] ; } void VEML6040::getWData(uint16_t *wdata) { uint8_t data[2] ; readRegs(REG_W_Data, data, 2) ; *wdata = (data[1]<<8) | data[0] ; } // usage // fvalue = veml->getUVA() ; // printf("%f", fvalue) ; float VEML6040::getR(void) { uint16_t data ; float value ; getRData(&data) ; value = (float)LUX_RESOLUTION_0 * (float)data ; return( value ) ; } float VEML6040::getG(void) { uint16_t data ; float value ; getGData(&data) ; value = (float)LUX_RESOLUTION_0 * (float)data ; return( value ) ; } float VEML6040::getB(void) { uint16_t data ; float value ; getBData(&data) ; value = (float)LUX_RESOLUTION_0 * (float)data ; return( value ) ; } float VEML6040::getW(void) { uint16_t data ; float value ; getWData(&data) ; value = (float)LUX_RESOLUTION_0 * (float)data ; return( value ) ; } float VEML6040::getX(void) { uint16_t R ; uint16_t G ; uint16_t B ; float value ; getRData(&R) ; getGData(&G) ; getBData(&B) ; value = (float)CORR_COEFF_M0 * (float)R + (float)CORR_COEFF_M1 * (float)G + (float)CORR_COEFF_M2 * (float)B ; return( value ) ; } float VEML6040::getY(void) { uint16_t R ; uint16_t G ; uint16_t B ; float value ; getRData(&R) ; getGData(&G) ; getBData(&B) ; value = (float)CORR_COEFF_M3 * (float)R + (float)CORR_COEFF_M4 * (float)G + (float)CORR_COEFF_M5 * (float)B ; return( value ) ; } float VEML6040::getZ(void) { uint16_t R ; uint16_t G ; uint16_t B ; float value ; getRData(&R) ; getGData(&G) ; getBData(&B) ; value = (float)CORR_COEFF_M6 * (float)R + (float)CORR_COEFF_M7 * (float)G + (float)CORR_COEFF_M8 * (float)B ; return( value ) ; } float VEML6040::getCCTiData(void) { uint16_t rdata ; uint16_t gdata ; uint16_t bdata ; float value ; getRData(&rdata) ; getGData(&gdata) ; getBData(&bdata) ; value = ((float)rdata - (float)bdata) / (float)gdata + (float)OFFSET_OPEN_AIR ; return( value ) ; } float VEML6040::getCCTData(void) { // uint16_t cctidata ; float cctidata ; float value ; cctidata = getCCTiData() ; // getCCTiData(&cctidata) ; value = (float)CCT_CONST * powf( cctidata, -1.2455 ) ; return( value ) ; } float VEML6040::getCIEX(void) { float X ; float Y ; float Z ; float value ; X = getX() ; Y = getY() ; Z = getZ() ; value = (float)X / ((float)X + (float)Y + (float)Z) ; return( value ) ; } float VEML6040::getCIEY(void) { float X ; float Y ; float Z ; float value ; X = getX() ; Y = getY() ; Z = getZ() ; value = (float)Y / ((float)X + (float)Y + (float)Z) ; return( value ) ; } void VEML6040::readRegs(int addr, uint8_t * data, int len) { char t[1] = {addr}; m_i2c.write(m_addr, t, 1, true); m_i2c.read(m_addr, (char *)data, len); } void VEML6040::writeRegs(uint8_t * data, int len) { m_i2c.write(m_addr, (char *)data, len); }