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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Driver for VEML6075 Ambient Light Sensor.
*/
#include "driver/veml6075.h"
#if defined(CONFIG_meta_driver_hardware_i2c)
#include "driver/i2c.h"
#elif defined(CONFIG_driver_softi2c)
#include "driver/soft_i2c.h"
#endif
bool VEML6075::init()
{
txbuf[0] = 0x00;
txbuf[1] = 0x00; // 50ms integration time, normal dynamic
if (i2c.xmit(address, 2, txbuf, 0, rxbuf) != 0) {
return false;
}
return true;
}
bool VEML6075::readUVCounts(float *uva, float *uvb)
{
uint16_t uva_counts, uvb_counts, comp_visible, comp_ir;
txbuf[0] = 0x07;
if (i2c.xmit(address, 1, txbuf, 2, rxbuf) != 0) {
return false;
}
uva_counts = ((uint16_t)rxbuf[1] << 8) + rxbuf[0];
txbuf[0] = 0x09;
if (i2c.xmit(address, 1, txbuf, 2, rxbuf) != 0) {
return false;
}
uvb_counts = ((uint16_t)rxbuf[1] << 8) + rxbuf[0];
txbuf[0] = 0x0a;
if (i2c.xmit(address, 1, txbuf, 2, rxbuf) != 0) {
return false;
}
comp_visible = ((uint16_t)rxbuf[1] << 8) + rxbuf[0];
txbuf[0] = 0x0b;
if (i2c.xmit(address, 1, txbuf, 2, rxbuf) != 0) {
return false;
}
comp_ir = ((uint16_t)rxbuf[1] << 8) + rxbuf[0];
*uva = uva_counts - uva_a_coef * comp_visible - uva_b_coef * comp_ir;
*uvb = uvb_counts - uvb_c_coef * comp_visible - uvb_d_coef * comp_ir;
return true;
}
bool VEML6075::readUV(float *uva, float *uvb)
{
float uva_counts, uvb_counts;
if (!readUVCounts(&uva_counts, &uvb_counts)) {
return false;
}
*uva = uva_counts * uva_counts_per_uwcm2;
*uvb = uvb_counts * uvb_counts_per_uwcm2;
return true;
}
bool VEML6075::readUVI(float *uva, float *uvb)
{
float uva_counts, uvb_counts;
if (!readUVCounts(&uva_counts, &uvb_counts)) {
return false;
}
*uva = uva_counts * uva_uvi_response;
*uvb = uvb_counts * uvb_uvi_response;
return true;
}
VEML6075 veml6075(0x10);
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