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/*
* Copyright 2021 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "arch.h"
#include "driver/sen5x.h"
#if defined(CONFIG_meta_driver_hardware_i2c)
#include "driver/i2c.h"
#elif defined(CONFIG_driver_softi2c)
#include "driver/soft_i2c.h"
#endif
void SEN5x::cleanFan()
{
txbuf[0] = 0x56;
txbuf[1] = 0x07;
i2c.xmit(address, 2, txbuf, 0, rxbuf);
}
void SEN5x::start()
{
txbuf[0] = 0x00;
txbuf[1] = 0x21;
i2c.xmit(address, 2, txbuf, 0, rxbuf);
}
void SEN5x::stop()
{
txbuf[0] = 0x01;
txbuf[1] = 0x04;
i2c.xmit(address, 2, txbuf, 0, rxbuf);
}
bool SEN5x::read()
{
txbuf[0] = 0x03;
txbuf[1] = 0xc4;
if (i2c.xmit(address, 2, txbuf, 0, rxbuf)) {
return false;
}
arch.delay_ms(20);
if (i2c.xmit(address, 0, txbuf, 24, rxbuf)) {
return false;
}
if (!crcValid(rxbuf, 24)) {
return false;
}
pm1 = (rxbuf[0] << 8) + rxbuf[1];
pm2_5 = (rxbuf[3] << 8) + rxbuf[4];
pm4 = (rxbuf[6] << 8) + rxbuf[7];
pm10 = (rxbuf[9] << 8) + rxbuf[10];
humidity = (rxbuf[12] << 8) + rxbuf[13];
temperature = (rxbuf[15] << 8) + rxbuf[16];
voc = (rxbuf[18] << 8) + rxbuf[19];
nox = (rxbuf[21] << 8) + rxbuf[22];
return true;
}
bool SEN5x::readStatus()
{
txbuf[0] = 0xd2;
txbuf[1] = 0x06;
if (i2c.xmit(address, 2, txbuf, 0, rxbuf)) {
return false;
}
arch.delay_ms(20);
if (i2c.xmit(address, 0, txbuf, 6, rxbuf)) {
return false;
}
if (!crcValid(rxbuf, 6)) {
return false;
}
fan_speed_warning = rxbuf[1] & 0x20;
fan_cleaning_active = rxbuf[1] & 0x08;
gas_sensor_error = rxbuf[4] & 0x80;
rht_sensor_error = rxbuf[4] & 0x40;
laser_failure = rxbuf[4] & 0x20;
fan_failure = rxbuf[4] & 0x10;
return true;
}
unsigned char SEN5x::crcWord(unsigned char byte1, unsigned char byte2)
{
unsigned char crc = 0xff ^ byte1;
for (unsigned char bit = 8; bit > 0; bit--) {
crc = (crc << 1) ^ (crc & 0x80 ? 0x31 : 0);
}
crc ^= byte2;
for (unsigned char bit = 8; bit > 0; bit--) {
crc = (crc << 1) ^ (crc & 0x80 ? 0x31 : 0);
}
return crc;
}
bool SEN5x::crcValid(unsigned char* data, unsigned char length)
{
for (unsigned char i = 0; i < length; i += 3) {
if (crcWord(data[i], data[i+1]) != data[i+2]) {
return false;
}
}
return true;
}
SEN5x sen5x;
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