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nodemcu-firmware/app/modules/bme680.c

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// ***************************************************************************
// Port of BMP680 module for ESP8266 with nodeMCU
//
// Written by Lukas Voborsky, @voborsky
// ***************************************************************************
// #define NODE_DEBUG
#include "module.h"
#include "lauxlib.h"
#include "platform.h"
#include "user_interface.h"
#include <math.h>
#include "bme680_defs.h"
#define DEFAULT_HEATER_DUR 100
#define DEFAULT_HEATER_TEMP 300
#define DEFAULT_AMBIENT_TEMP 23
static const uint32_t bme680_i2c_id = BME680_CHIP_ID_ADDR;
static uint8_t bme680_i2c_addr = BME680_I2C_ADDR_PRIMARY;
os_timer_t bme680_timer; // timer for forced mode readout
int lua_connected_readout_ref; // callback when readout is ready
static struct bme680_calib_data bme680_data;
static uint8_t bme680_mode = 0; // stores oversampling settings
static uint8 os_temp = 0;
static uint8 os_pres = 0;
static uint8 os_hum = 0; // stores humidity oversampling settings
static uint16_t heatr_dur;
static int8_t amb_temp = 23; //DEFAULT_AMBIENT_TEMP;
static uint32_t bme680_h = 0;
static double bme680_hc = 1.0;
// return 0 if good
static int r8u_n(uint8_t reg, int n, uint8_t *buff) {
int i;
platform_i2c_send_start(bme680_i2c_id);
platform_i2c_send_address(bme680_i2c_id, bme680_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(bme680_i2c_id, reg);
// platform_i2c_send_stop(bme680_i2c_id); // doco says not needed
platform_i2c_send_start(bme680_i2c_id);
platform_i2c_send_address(bme680_i2c_id, bme680_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
while (n-- > 0)
*buff++ = platform_i2c_recv_byte(bme680_i2c_id, n > 0);
platform_i2c_send_stop(bme680_i2c_id);
return 0;
}
static uint8_t w8u(uint8_t reg, uint8_t val) {
platform_i2c_send_start(bme680_i2c_id);
platform_i2c_send_address(bme680_i2c_id, bme680_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(bme680_i2c_id, reg);
platform_i2c_send_byte(bme680_i2c_id, val);
platform_i2c_send_stop(bme680_i2c_id);
}
static uint8_t r8u(uint8_t reg) {
uint8_t ret[1];
r8u_n(reg, 1, ret);
return ret[0];
}
// replace 'dev->calib.' with 'bme680_data.'
// replace 'dev->amb_temp' with 'amb_temp'
/**\mainpage
* Copyright (C) 2017 - 2018 Bosch Sensortec GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the copyright holder nor the names of the
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
* OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*
* The information provided is believed to be accurate and reliable.
* The copyright holder assumes no responsibility
* for the consequences of use
* of such information nor for any infringement of patents or
* other rights of third parties which may result from its use.
* No license is granted by implication or otherwise under any patent or
* patent rights of the copyright holder.
*
* File bme680.c
* @date 19 Jun 2018
* @version 3.5.9
*
*/
static uint8_t calc_heater_res(uint16_t temp)
{
uint8_t heatr_res;
int32_t var1;
int32_t var2;
int32_t var3;
int32_t var4;
int32_t var5;
int32_t heatr_res_x100;
if (temp > 400) /* Cap temperature */
temp = 400;
var1 = (((int32_t) amb_temp * bme680_data.par_gh3) / 1000) * 256;
var2 = (bme680_data.par_gh1 + 784) * (((((bme680_data.par_gh2 + 154009) * temp * 5) / 100) + 3276800) / 10);
var3 = var1 + (var2 / 2);
var4 = (var3 / (bme680_data.res_heat_range + 4));
var5 = (131 * bme680_data.res_heat_val) + 65536;
heatr_res_x100 = (int32_t) (((var4 / var5) - 250) * 34);
heatr_res = (uint8_t) ((heatr_res_x100 + 50) / 100);
return heatr_res;
}
static uint8_t calc_heater_dur(uint16_t dur)
{
uint8_t factor = 0;
uint8_t durval;
if (dur >= 0xfc0) {
durval = 0xff; /* Max duration*/
} else {
while (dur > 0x3F) {
dur = dur / 4;
factor += 1;
}
durval = (uint8_t) (dur + (factor * 64));
}
return durval;
}
static int16_t calc_temperature(uint32_t temp_adc)
{
int64_t var1;
int64_t var2;
int64_t var3;
int16_t calc_temp;
var1 = ((int32_t) temp_adc >> 3) - ((int32_t) bme680_data.par_t1 << 1);
var2 = (var1 * (int32_t) bme680_data.par_t2) >> 11;
var3 = ((var1 >> 1) * (var1 >> 1)) >> 12;
var3 = ((var3) * ((int32_t) bme680_data.par_t3 << 4)) >> 14;
bme680_data.t_fine = (int32_t) (var2 + var3);
calc_temp = (int16_t) (((bme680_data.t_fine * 5) + 128) >> 8);
return calc_temp;
}
static uint32_t calc_pressure(uint32_t pres_adc)
{
int32_t var1;
int32_t var2;
int32_t var3;
int32_t pressure_comp;
var1 = (((int32_t)bme680_data.t_fine) >> 1) - 64000;
var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) *
(int32_t)bme680_data.par_p6) >> 2;
var2 = var2 + ((var1 * (int32_t)bme680_data.par_p5) << 1);
var2 = (var2 >> 2) + ((int32_t)bme680_data.par_p4 << 16);
var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
((int32_t)bme680_data.par_p3 << 5)) >> 3) +
(((int32_t)bme680_data.par_p2 * var1) >> 1);
var1 = var1 >> 18;
var1 = ((32768 + var1) * (int32_t)bme680_data.par_p1) >> 15;
pressure_comp = 1048576 - pres_adc;
pressure_comp = (int32_t)((pressure_comp - (var2 >> 12)) * ((uint32_t)3125));
if (pressure_comp >= BME680_MAX_OVERFLOW_VAL)
pressure_comp = ((pressure_comp / var1) << 1);
else
pressure_comp = ((pressure_comp << 1) / var1);
var1 = ((int32_t)bme680_data.par_p9 * (int32_t)(((pressure_comp >> 3) *
(pressure_comp >> 3)) >> 13)) >> 12;
var2 = ((int32_t)(pressure_comp >> 2) *
(int32_t)bme680_data.par_p8) >> 13;
var3 = ((int32_t)(pressure_comp >> 8) * (int32_t)(pressure_comp >> 8) *
(int32_t)(pressure_comp >> 8) *
(int32_t)bme680_data.par_p10) >> 17;
pressure_comp = (int32_t)(pressure_comp) + ((var1 + var2 + var3 +
((int32_t)bme680_data.par_p7 << 7)) >> 4);
return (uint32_t)pressure_comp;
}
static uint32_t calc_humidity(uint16_t hum_adc)
{
int32_t var1;
int32_t var2;
int32_t var3;
int32_t var4;
int32_t var5;
int32_t var6;
int32_t temp_scaled;
int32_t calc_hum;
temp_scaled = (((int32_t) bme680_data.t_fine * 5) + 128) >> 8;
var1 = (int32_t) (hum_adc - ((int32_t) ((int32_t) bme680_data.par_h1 * 16)))
- (((temp_scaled * (int32_t) bme680_data.par_h3) / ((int32_t) 100)) >> 1);
var2 = ((int32_t) bme680_data.par_h2
* (((temp_scaled * (int32_t) bme680_data.par_h4) / ((int32_t) 100))
+ (((temp_scaled * ((temp_scaled * (int32_t) bme680_data.par_h5) / ((int32_t) 100))) >> 6)
/ ((int32_t) 100)) + (int32_t) (1 << 14))) >> 10;
var3 = var1 * var2;
var4 = (int32_t) bme680_data.par_h6 << 7;
var4 = ((var4) + ((temp_scaled * (int32_t) bme680_data.par_h7) / ((int32_t) 100))) >> 4;
var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
var6 = (var4 * var5) >> 1;
calc_hum = (((var3 + var6) >> 10) * ((int32_t) 1000)) >> 12;
if (calc_hum > 100000) /* Cap at 100%rH */
calc_hum = 100000;
else if (calc_hum < 0)
calc_hum = 0;
return (uint32_t) calc_hum;
}
/**static variables */
/**Look up table 1 for the possible gas range values */
uint32_t lookupTable1[16] = { UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647),
UINT32_C(2147483647), UINT32_C(2126008810), UINT32_C(2147483647), UINT32_C(2130303777),
UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2143188679), UINT32_C(2136746228),
UINT32_C(2147483647), UINT32_C(2126008810), UINT32_C(2147483647), UINT32_C(2147483647) };
/**Look up table 2 for the possible gas range values */
uint32_t lookupTable2[16] = { UINT32_C(4096000000), UINT32_C(2048000000), UINT32_C(1024000000), UINT32_C(512000000),
UINT32_C(255744255), UINT32_C(127110228), UINT32_C(64000000), UINT32_C(32258064), UINT32_C(16016016),
UINT32_C(8000000), UINT32_C(4000000), UINT32_C(2000000), UINT32_C(1000000), UINT32_C(500000),
UINT32_C(250000), UINT32_C(125000) };
static uint32_t calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range)
{
int64_t var1;
uint64_t var2;
int64_t var3;
uint32_t calc_gas_res;
var1 = (int64_t) ((1340 + (5 * (int64_t) bme680_data.range_sw_err)) *
((int64_t) lookupTable1[gas_range])) >> 16;
var2 = (((int64_t) ((int64_t) gas_res_adc << 15) - (int64_t) (16777216)) + var1);
var3 = (((int64_t) lookupTable2[gas_range] * (int64_t) var1) >> 9);
calc_gas_res = (uint32_t) ((var3 + ((int64_t) var2 >> 1)) / (int64_t) var2);
return calc_gas_res;
}
uint16_t calc_dur()
{
uint32_t tph_dur; /* Calculate in us */
/* TPH measurement duration */
tph_dur = ((uint32_t) (os_temp + os_pres + os_hum) * UINT32_C(1963));
tph_dur += UINT32_C(477 * 4); /* TPH switching duration */
tph_dur += UINT32_C(477 * 5); /* Gas measurement duration */
tph_dur += UINT32_C(500); /* Get it to the closest whole number.*/
tph_dur /= UINT32_C(1000); /* Convert to ms */
tph_dur += UINT32_C(1); /* Wake up duration of 1ms */
NODE_DBG("tpc_dur: %d\n", tph_dur);
/* The remaining time should be used for heating */
return heatr_dur + (uint16_t) tph_dur;
}
/* This part of code is coming from the original bme680.c driver by Bosch.
* END */
static double ln(double x) {
double y = (x-1)/(x+1);
double y2 = y*y;
double r = 0;
for (int8_t i=33; i>0; i-=2) { //we've got the power
r = 1.0/(double)i + y2 * r;
}
return 2*y*r;
}
static double bme280_qfe2qnh(int32_t qfe, int32_t h) {
double hc;
if (bme680_h == h) {
hc = bme680_hc;
} else {
hc = pow((double)(1.0 - 2.25577e-5 * h), (double)(-5.25588));
bme680_hc = hc; bme680_h = h;
}
double qnh = (double)qfe * hc;
return qnh;
}
static int bme680_lua_setup(lua_State* L) {
uint8_t ack;
bme680_i2c_addr = BME680_I2C_ADDR_PRIMARY;
platform_i2c_send_start(bme680_i2c_id);
ack = platform_i2c_send_address(bme680_i2c_id, bme680_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_stop(bme680_i2c_id);
if (!ack) {
NODE_DBG("No ACK on address: %x\n", bme680_i2c_addr);
bme680_i2c_addr = BME680_I2C_ADDR_SECONDARY;
platform_i2c_send_start(bme680_i2c_id);
ack = platform_i2c_send_address(bme680_i2c_id, bme680_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_stop(bme680_i2c_id);
if (!ack) {
NODE_DBG("No ACK on address: %x\n", bme680_i2c_addr);
return 0;
}
}
uint8_t chipid = r8u(BME680_CHIP_ID_ADDR);
NODE_DBG("chip_id: %x\n", chipid);
#define r16uLE_buf(reg) (uint16_t)(((uint16_t)reg[1] << 8) | (uint16_t)reg[0])
#define r16sLE_buf(reg) (int16_t)(r16uLE_buf(reg))
uint8_t buff[BME680_COEFF_SIZE], *reg;
r8u_n(BME680_COEFF_ADDR1, BME680_COEFF_ADDR1_LEN, buff);
r8u_n(BME680_COEFF_ADDR2, BME680_COEFF_ADDR2_LEN, &buff[BME680_COEFF_ADDR1_LEN]);
reg = buff + 1;
bme680_data.par_t2 = r16sLE_buf(reg); reg+=2; // #define BME680_T3_REG (3)
bme680_data.par_t3 = (int8_t) reg[0]; reg+=2; // #define BME680_P1_LSB_REG (5)
bme680_data.par_p1 = r16uLE_buf(reg); reg+=2; // #define BME680_P2_LSB_REG (7)
bme680_data.par_p2 = r16sLE_buf(reg); reg+=2; // #define BME680_P3_REG (9)
bme680_data.par_p3 = (int8_t) reg[0]; reg+=2; // #define BME680_P4_LSB_REG (11)
bme680_data.par_p4 = r16sLE_buf(reg); reg+=2; // #define BME680_P5_LSB_REG (13)
bme680_data.par_p5 = r16sLE_buf(reg); reg+=2; // #define BME680_P7_REG (15)
bme680_data.par_p7 = (int8_t) reg[0]; reg++; // #define BME680_P6_REG (16)
bme680_data.par_p6 = (int8_t) reg[0]; reg+=3; // #define BME680_P8_LSB_REG (19)
bme680_data.par_p8 = r16sLE_buf(reg); reg+=2; // #define BME680_P9_LSB_REG (21)
bme680_data.par_p9 = r16sLE_buf(reg); reg+=2; // #define BME680_P10_REG (23)
bme680_data.par_p10 = (int8_t) reg[0]; reg+=2; // #define BME680_H2_MSB_REG (25)
bme680_data.par_h2 = (uint16_t) (((uint16_t) reg[0] << BME680_HUM_REG_SHIFT_VAL)
| ((reg[1]) >> BME680_HUM_REG_SHIFT_VAL)); reg++; // #define BME680_H1_LSB_REG (26)
bme680_data.par_h1 = (uint16_t) (((uint16_t) reg[1] << BME680_HUM_REG_SHIFT_VAL)
| (reg[0] & BME680_BIT_H1_DATA_MSK)); reg+=2; // #define BME680_H3_REG (28)
bme680_data.par_h3 = (int8_t) reg[0]; reg++; // #define BME680_H4_REG (29)
bme680_data.par_h4 = (int8_t) reg[0]; reg++; // #define BME680_H5_REG (30)
bme680_data.par_h5 = (int8_t) reg[0]; reg++; // #define BME680_H6_REG (31)
bme680_data.par_h6 = (uint8_t) reg[0]; reg++; // #define BME680_H7_REG (32)
bme680_data.par_h7 = (int8_t) reg[0]; reg++; // #define BME680_T1_LSB_REG (33)
bme680_data.par_t1 = r16uLE_buf(reg); reg+=2; // #define BME680_GH2_LSB_REG (35)
bme680_data.par_gh2 = r16sLE_buf(reg); reg+=2; // #define BME680_GH1_REG (37)
bme680_data.par_gh1 = reg[0]; reg++; // #define BME680_GH3_REG (38)
bme680_data.par_gh3 = reg[0];
#undef r16uLE_buf
#undef r16sLE_buf
/* Other coefficients */
bme680_data.res_heat_range = ((r8u(BME680_ADDR_RES_HEAT_RANGE_ADDR) & BME680_RHRANGE_MSK) / 16);
bme680_data.res_heat_val = (int8_t) r8u(BME680_ADDR_RES_HEAT_VAL_ADDR);
bme680_data.range_sw_err = ((int8_t) r8u(BME680_ADDR_RANGE_SW_ERR_ADDR) & (int8_t) BME680_RSERROR_MSK) / 16;
NODE_DBG("par_T: %d\t%d\t%d\n", bme680_data.par_t1, bme680_data.par_t2, bme680_data.par_t3);
NODE_DBG("par_P: %d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", bme680_data.par_p1, bme680_data.par_p2, bme680_data.par_p3, bme680_data.par_p4, bme680_data.par_p5, bme680_data.par_p6, bme680_data.par_p7, bme680_data.par_p8, bme680_data.par_p9, bme680_data.par_p10);
NODE_DBG("par_H: %d\t%d\t%d\t%d\t%d\t%d\t%d\n", bme680_data.par_h1, bme680_data.par_h2, bme680_data.par_h3, bme680_data.par_h4, bme680_data.par_h5, bme680_data.par_h6, bme680_data.par_h7);
NODE_DBG("par_GH: %d\t%d\t%d\n", bme680_data.par_gh1, bme680_data.par_gh2, bme680_data.par_gh3);
NODE_DBG("res_heat_range, res_heat_val, range_sw_err: %d\t%d\t%d\n", bme680_data.res_heat_range, bme680_data.res_heat_val, bme680_data.range_sw_err);
uint8_t full_init = !lua_isnumber(L, 7)?1:lua_tointeger(L, 7); // 7-th parameter: init the chip too
if (full_init) {
uint8_t filter;
uint8_t const bit3 = 0b111;
uint8_t const bit2 = 0b11;
//bme680.setup([temp_oss, press_oss, humi_oss, heater_temp, heater_duration, IIR_filter])
os_temp = (!lua_isnumber(L, 1)?BME680_OS_2X:(luaL_checkinteger(L, 1)&bit3)); // 1-st parameter: temperature oversampling
os_pres = (!lua_isnumber(L, 2)?BME680_OS_16X:(luaL_checkinteger(L, 2)&bit3)); // 2-nd parameter: pressure oversampling
os_hum = (!lua_isnumber(L, 3))?BME680_OS_1X:(luaL_checkinteger(L, 3)&bit3);
bme680_mode = BME680_SLEEP_MODE | (os_pres << 2) | (os_temp << 5);
os_hum = os_hum; // 3-rd parameter: humidity oversampling
filter = ((!lua_isnumber(L, 6)?BME680_FILTER_SIZE_31:(luaL_checkinteger(L, 6)&bit3)) << 2); // 6-th parameter: IIR filter
NODE_DBG("mode: %x\nhumidity oss: %x\nconfig: %x\n", bme680_mode, os_hum, filter);
heatr_dur = (!lua_isnumber(L, 5)?DEFAULT_HEATER_DUR:(luaL_checkinteger(L, 5))); // 5-th parameter: heater duration
w8u(BME680_GAS_WAIT0_ADDR, calc_heater_dur(heatr_dur));
w8u(BME680_RES_HEAT0_ADDR, calc_heater_res((!lua_isnumber(L, 4)?DEFAULT_HEATER_TEMP:(luaL_checkinteger(L, 4))))); // 4-th parameter: heater temperature
w8u(BME680_CONF_ODR_FILT_ADDR, BME680_SET_BITS_POS_0(r8u(BME680_CONF_ODR_FILT_ADDR), BME680_FILTER, filter)); // #define BME680_CONF_ODR_FILT_ADDR UINT8_C(0x75)
// set heater on
w8u(BME680_CONF_HEAT_CTRL_ADDR, BME680_SET_BITS_POS_0(r8u(BME680_CONF_HEAT_CTRL_ADDR), BME680_HCTRL, 1));
w8u(BME680_CONF_T_P_MODE_ADDR, bme680_mode);
w8u(BME680_CONF_OS_H_ADDR, BME680_SET_BITS_POS_0(r8u(BME680_CONF_OS_H_ADDR), BME680_OSH, os_hum));
w8u(BME680_CONF_ODR_RUN_GAS_NBC_ADDR, 1 << 4 | 0 & bit3);
}
lua_pushinteger(L, 1);
return 1;
}
static void bme280_readoutdone (void *arg)
{
NODE_DBG("timer out\n");
lua_State *L = lua_getstate();
lua_rawgeti (L, LUA_REGISTRYINDEX, lua_connected_readout_ref);
luaL_unref (L, LUA_REGISTRYINDEX, lua_connected_readout_ref);
os_timer_disarm (&bme680_timer);
luaL_pcallx (L, 0, 0);
}
static int bme680_lua_startreadout(lua_State* L) {
uint32_t delay;
if (lua_isnumber(L, 1)) {
delay = luaL_checkinteger(L, 1);
if (!delay) {delay = calc_dur();} // if delay is 0 then set the default delay
}
if (!lua_isnoneornil(L, 2)) {
lua_pushvalue(L, 2);
lua_connected_readout_ref = luaL_ref(L, LUA_REGISTRYINDEX);
} else {
lua_connected_readout_ref = LUA_NOREF;
}
w8u(BME680_CONF_OS_H_ADDR, os_hum);
w8u(BME680_CONF_T_P_MODE_ADDR, (bme680_mode & 0xFC) | BME680_FORCED_MODE);
NODE_DBG("control old: %x, control: %x, delay: %d\n", bme680_mode, (bme680_mode & 0xFC) | BME680_FORCED_MODE, delay);
if (lua_connected_readout_ref != LUA_NOREF) {
NODE_DBG("timer armed\n");
os_timer_disarm (&bme680_timer);
os_timer_setfn (&bme680_timer, (os_timer_func_t *)bme280_readoutdone, L);
os_timer_arm (&bme680_timer, delay, 0); // trigger callback when readout is ready
}
return 0;
}
// Return nothing on failure
// Return T, QFE, H if no altitude given
// Return T, QFE, H, QNH if altitude given
static int bme680_lua_read(lua_State* L) {
uint8_t buff[BME680_FIELD_LENGTH] = { 0 };
uint8_t gas_range;
uint32_t adc_temp;
uint32_t adc_pres;
uint16_t adc_hum;
uint16_t adc_gas_res;
uint8_t status;
uint32_t qfe;
uint8_t calc_qnh = lua_isnumber(L, 1);
r8u_n(BME680_FIELD0_ADDR, BME680_FIELD_LENGTH, buff);
status = buff[0] & BME680_NEW_DATA_MSK;
/* read the raw data from the sensor */
adc_pres = (uint32_t) (((uint32_t) buff[2] * 4096) | ((uint32_t) buff[3] * 16) | ((uint32_t) buff[4] / 16));
adc_temp = (uint32_t) (((uint32_t) buff[5] * 4096) | ((uint32_t) buff[6] * 16) | ((uint32_t) buff[7] / 16));
adc_hum = (uint16_t) (((uint32_t) buff[8] * 256) | (uint32_t) buff[9]);
adc_gas_res = (uint16_t) ((uint32_t) buff[13] * 4 | (((uint32_t) buff[14]) / 64));
gas_range = buff[14] & BME680_GAS_RANGE_MSK;
status |= buff[14] & BME680_GASM_VALID_MSK;
status |= buff[14] & BME680_HEAT_STAB_MSK;
NODE_DBG("status, new_data, gas_range, gasm_valid: 0x%x, 0x%x, 0x%x, 0x%x\n", status, status & BME680_NEW_DATA_MSK, buff[14] & BME680_GAS_RANGE_MSK, buff[14] & BME680_GASM_VALID_MSK);
if (!(status & BME680_NEW_DATA_MSK)) {
return 0;
}
int16_t temp = calc_temperature(adc_temp);
amb_temp = temp / 100;
lua_pushinteger(L, temp);
qfe = calc_pressure(adc_pres);
lua_pushinteger(L, qfe);
lua_pushinteger(L, calc_humidity(adc_hum));
lua_pushinteger(L, calc_gas_resistance(adc_gas_res, gas_range));
if (calc_qnh) { // have altitude
int32_t h = luaL_checkinteger(L, 1);
double qnh = bme280_qfe2qnh(qfe, h);
lua_pushinteger(L, (int32_t)(qnh + 0.5));
return 5;
}
return 4;
}
static int bme680_lua_qfe2qnh(lua_State* L) {
if (!lua_isnumber(L, 2)) {
return luaL_error(L, "wrong arg range");
}
int32_t qfe = luaL_checkinteger(L, 1);
int32_t h = luaL_checkinteger(L, 2);
double qnh = bme280_qfe2qnh(qfe, h);
lua_pushinteger(L, (int32_t)(qnh + 0.5));
return 1;
}
static int bme680_lua_altitude(lua_State* L) {
if (!lua_isnumber(L, 2)) {
return luaL_error(L, "wrong arg range");
}
int32_t P = luaL_checkinteger(L, 1);
int32_t qnh = luaL_checkinteger(L, 2);
double h = (1.0 - pow((double)P/(double)qnh, 1.0/5.25588)) / 2.25577e-5 * 100.0;
lua_pushinteger(L, (int32_t)(h + (((h<0)?-1:(h>0)) * 0.5)));
return 1;
}
static int bme680_lua_dewpoint(lua_State* L) {
if (!lua_isnumber(L, 2)) {
return luaL_error(L, "wrong arg range");
}
double H = luaL_checkinteger(L, 1)/100000.0;
double T = luaL_checkinteger(L, 2)/100.0;
const double c243 = 243.5;
const double c17 = 17.67;
double c = ln(H) + ((c17 * T) / (c243 + T));
double d = (c243 * c)/(c17 - c) * 100.0;
lua_pushinteger(L, (int32_t)(d + (((d<0)?-1:(d>0)) * 0.5)));
return 1;
}
LROT_BEGIN(bme680, NULL, 0)
LROT_FUNCENTRY( setup, bme680_lua_setup )
LROT_FUNCENTRY( startreadout, bme680_lua_startreadout )
LROT_FUNCENTRY( qfe2qnh, bme680_lua_qfe2qnh )
LROT_FUNCENTRY( altitude, bme680_lua_altitude )
LROT_FUNCENTRY( dewpoint, bme680_lua_dewpoint )
LROT_FUNCENTRY( read, bme680_lua_read )
LROT_END(bme680, NULL, 0)
NODEMCU_MODULE(BME680, "bme680", bme680, NULL);
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