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#include "veml.h"
constexpr float BASE_LUX_PER_LSB = 0.0042f;
using namespace ocularium::veml;
uint16_t Config::to_reg() const
{
uint16_t result = 0;
result |= shutdown ? 1 : 0;
result |= interrupt ? 1 : 0;
result |= static_cast<uint8_t>(integration) << 6;
result |= static_cast<uint8_t>(gain) << 11;
return result;
}
bool VEML::init(const Config& config) {
if (chipid() != CHIPID) return false;
set_config(config);
write_reg(Reg::POWER, 0);
return true;
}
uint16_t VEML::chipid() const
{
return read_reg(Reg::CHIPID);
}
float VEML::lux() const
{
const auto val = read_reg(Reg::LUX) * config.gain_factor();
return static_cast<float>(val) * BASE_LUX_PER_LSB;
}
void VEML::set_config(const Config& config)
{
this->config = config;
write_reg(Reg::CONFIG, config.to_reg());
}
void VEML::write_reg(const Reg reg, const uint16_t val) const
{
wire.beginTransmission(ADDR);
wire.write(static_cast<uint8_t>(reg));
wire.write(val & 0xff);
wire.write(val >> 8);
wire.endTransmission();
}
uint16_t VEML::read_reg(const Reg reg) const
{
wire.flush();
wire.beginTransmission(ADDR);
wire.write(static_cast<uint8_t>(reg));
wire.endTransmission(false);
wire.requestFrom(ADDR, 2);
wire.endTransmission(true);
auto result = static_cast<uint16_t>(wire.read());
result |= wire.read() << 8;
return result;
}
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