Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

bme280 driver in Lua+C #3132

Merged
merged 1 commit into from
Oct 5, 2020
Merged

bme280 driver in Lua+C #3132

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions app/include/user_modules.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
//#define LUA_USE_MODULES_BLOOM
//#define LUA_USE_MODULES_BMP085
//#define LUA_USE_MODULES_BME280
//#define LUA_USE_MODULES_BME280_MATH
//#define LUA_USE_MODULES_BME680
//#define LUA_USE_MODULES_COAP
//#define LUA_USE_MODULES_COLOR_UTILS
Expand Down
2 changes: 2 additions & 0 deletions app/modules/bme280.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -236,6 +236,8 @@ static int bme280_lua_setup(lua_State* L) {
uint8_t const bit3 = 0b111;
uint8_t const bit2 = 0b11;

platform_print_deprecation_note("bme280", "soon. Use bme280math and bme280 Lua module instead");

bme280_mode = (!lua_isnumber(L, 4)?BME280_NORMAL_MODE:(luaL_checkinteger(L, 4)&bit2)) // 4-th parameter: power mode
| ((!lua_isnumber(L, 2)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 2)&bit3)) << 2) // 2-nd parameter: pressure oversampling
| ((!lua_isnumber(L, 1)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 1)&bit3)) << 5); // 1-st parameter: temperature oversampling
Expand Down
357 changes: 357 additions & 0 deletions app/modules/bme280_math.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,357 @@
// ***************************************************************************
// BMP280 module for ESP8266 with nodeMCU
//
// Written by Lukas Voborsky, @voborsky
//
// MIT license, http://opensource.org/licenses/MIT
// ***************************************************************************

// #define NODE_DEBUG

#include "module.h"
#include "lauxlib.h"
#include "platform.h"
#include "user_interface.h"
#include <math.h>

/****************************************************/
/**\name registers definition */
/***************************************************/
#define BME280_REGISTER_CONTROL (0xF4)
#define BME280_REGISTER_CONTROL_HUM (0xF2)
#define BME280_REGISTER_CONFIG (0xF5)
#define BME280_REGISTER_CHIPID (0xD0)
#define BME280_REGISTER_VERSION (0xD1)
#define BME280_REGISTER_SOFTRESET (0xE0)
#define BME280_REGISTER_CAL26 (0xE1)
#define BME280_REGISTER_PRESS (0xF7) // 0xF7-0xF9
#define BME280_REGISTER_TEMP (0xFA) // 0xFA-0xFC
#define BME280_REGISTER_HUM (0xFD) // 0xFD-0xFE

#define BME280_REGISTER_DIG_T (0x88) // 0x88-0x8D ( 6)
#define BME280_REGISTER_DIG_P (0x8E) // 0x8E-0x9F (18)
#define BME280_REGISTER_DIG_H1 (0xA1) // 0xA1 ( 1)
#define BME280_REGISTER_DIG_H2 (0xE1) // 0xE1-0xE7 ( 7)
/****************************************************/
/**\name I2C ADDRESS DEFINITIONS */
/***************************************************/
#define BME280_I2C_ADDRESS1 (0x76)
#define BME280_I2C_ADDRESS2 (0x77)
/****************************************************/
/**\name POWER MODE DEFINITIONS */
/***************************************************/
/* Sensor Specific constants */
#define BME280_SLEEP_MODE (0x00)
#define BME280_FORCED_MODE (0x01)
#define BME280_NORMAL_MODE (0x03)
#define BME280_SOFT_RESET_CODE (0xB6)
/****************************************************/
/**\name OVER SAMPLING DEFINITIONS */
/***************************************************/
#define BME280_OVERSAMP_1X (0x01)
#define BME280_OVERSAMP_2X (0x02)
#define BME280_OVERSAMP_4X (0x03)
#define BME280_OVERSAMP_8X (0x04)
#define BME280_OVERSAMP_16X (0x05)
/****************************************************/
/**\name STANDBY TIME DEFINITIONS */
/***************************************************/
#define BME280_STANDBY_TIME_1_MS (0x00)
#define BME280_STANDBY_TIME_63_MS (0x01)
#define BME280_STANDBY_TIME_125_MS (0x02)
#define BME280_STANDBY_TIME_250_MS (0x03)
#define BME280_STANDBY_TIME_500_MS (0x04)
#define BME280_STANDBY_TIME_1000_MS (0x05)
#define BME280_STANDBY_TIME_10_MS (0x06)
#define BME280_STANDBY_TIME_20_MS (0x07)
/****************************************************/
/**\name FILTER DEFINITIONS */
/***************************************************/
#define BME280_FILTER_COEFF_OFF (0x00)
#define BME280_FILTER_COEFF_2 (0x01)
#define BME280_FILTER_COEFF_4 (0x02)
#define BME280_FILTER_COEFF_8 (0x03)
#define BME280_FILTER_COEFF_16 (0x04)
/****************************************************/
/**\data type definition */
/***************************************************/
#define BME280_S32_t int32_t
#define BME280_U32_t uint32_t
#define BME280_S64_t int64_t

#define BME280_SAMPLING_DELAY 113 //maximum measurement time in ms for maximum oversampling for all measures = 1.25 + 2.3*16 + 2.3*16 + 0.575 + 2.3*16 + 0.575 ms

// #define r16s(reg) ((int16_t)r16u(reg))
// #define r16sLE(reg) ((int16_t)r16uLE(reg))

// #define bme280_adc_P(void) r24u(BME280_REGISTER_PRESS)
// #define bme280_adc_T(void) r24u(BME280_REGISTER_TEMP)
// #define bme280_adc_H(void) r16u(BME280_REGISTER_HUM)

typedef struct {
uint16_t dig_T1;
int16_t dig_T2;
int16_t dig_T3;
uint16_t dig_P1;
int16_t dig_P2;
int16_t dig_P3;
int16_t dig_P4;
int16_t dig_P5;
int16_t dig_P6;
int16_t dig_P7;
int16_t dig_P8;
int16_t dig_P9;
uint8_t dig_H1;
int16_t dig_H2;
uint8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
} bme280_data_t;
typedef bme280_data_t* bme280_data_p;
bme280_data_p bme280_data;


BME280_S32_t bme280_t_fine;

// Returns temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC.
// t_fine carries fine temperature as global value
BME280_S32_t bme280_compensate_T(BME280_S32_t adc_T) {
BME280_S32_t var1, var2, T;
var1 = ((((adc_T>>3) - ((BME280_S32_t)(*bme280_data).dig_T1<<1))) * ((BME280_S32_t)(*bme280_data).dig_T2)) >> 11;
var2 = (((((adc_T>>4) - ((BME280_S32_t)(*bme280_data).dig_T1)) * ((adc_T>>4) - ((BME280_S32_t)(*bme280_data).dig_T1))) >> 12) *
((BME280_S32_t)(*bme280_data).dig_T3)) >> 14;
bme280_t_fine = var1 + var2;
T = (bme280_t_fine * 5 + 128) >> 8;
return T;
}

// Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits).
// Output value of “24674867” represents 24674867/256 = 96386.2 Pa = 963.862 hPa
BME280_U32_t bme280_compensate_P(BME280_S32_t adc_P) {
BME280_S64_t var1, var2, p;
var1 = ((BME280_S64_t)bme280_t_fine) - 128000;
var2 = var1 * var1 * (BME280_S64_t)(*bme280_data).dig_P6;
var2 = var2 + ((var1*(BME280_S64_t)(*bme280_data).dig_P5)<<17);
var2 = var2 + (((BME280_S64_t)(*bme280_data).dig_P4)<<35);
var1 = ((var1 * var1 * (BME280_S64_t)(*bme280_data).dig_P3)>>8) + ((var1 * (BME280_S64_t)(*bme280_data).dig_P2)<<12);
var1 = (((((BME280_S64_t)1)<<47)+var1))*((BME280_S64_t)(*bme280_data).dig_P1)>>33;
if (var1 == 0) {
return 0; // avoid exception caused by division by zero
}
p = 1048576-adc_P;
p = (((p<<31)-var2)*3125)/var1;
var1 = (((BME280_S64_t)(*bme280_data).dig_P9) * (p>>13) * (p>>13)) >> 25;
var2 = (((BME280_S64_t)(*bme280_data).dig_P8) * p) >> 19;
p = ((p + var1 + var2) >> 8) + (((BME280_S64_t)(*bme280_data).dig_P7)<<4);
p = (p * 10) >> 8;
return (BME280_U32_t)p;
}

// Returns humidity in %RH as unsigned 32 bit integer in Q22.10 format (22 integer and 10 fractional bits).
// Output value of “47445” represents 47445/1024 = 46.333 %RH
BME280_U32_t bme280_compensate_H(BME280_S32_t adc_H) {
BME280_S32_t v_x1_u32r;

v_x1_u32r = (bme280_t_fine - ((BME280_S32_t)76800));
v_x1_u32r = (((((adc_H << 14) - (((BME280_S32_t)(*bme280_data).dig_H4) << 20) - (((BME280_S32_t)(*bme280_data).dig_H5) * v_x1_u32r)) +
((BME280_S32_t)16384)) >> 15) * (((((((v_x1_u32r * ((BME280_S32_t)(*bme280_data).dig_H6)) >> 10) * (((v_x1_u32r *
((BME280_S32_t)(*bme280_data).dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) *
((BME280_S32_t)(*bme280_data).dig_H2) + 8192) >> 14));
v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((BME280_S32_t)(*bme280_data).dig_H1)) >> 4));
v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r);
v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r);
v_x1_u32r = v_x1_u32r>>12;
return (BME280_U32_t)((v_x1_u32r * 1000)>>10);
}

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;
}

uint32_t bme280_h = 0; // buffer last qfe2qnh calculation
double bme280_hc = 1.0;

double bme280_qfe2qnh(double qfe, double h) {
double hc;
if (bme280_h == h) {
hc = bme280_hc;
} else {
hc = pow((double)(1.0 - 2.25577e-5 * h), (double)(-5.25588));
bme280_hc = hc; bme280_h = h;
}
double qnh = (double)qfe * hc;
return qnh;
}

int bme280_lua_setup(lua_State* L) {
uint8_t bme280_mode = 0; // stores oversampling settings
uint8_t bme280_ossh = 0; // stores humidity oversampling settings
uint8_t config;

uint8_t const bit3 = 0b111;
uint8_t const bit2 = 0b11;

bme280_mode = (!lua_isnumber(L, 5)?BME280_NORMAL_MODE:(luaL_checkinteger(L, 5)&bit2)) // 4-th parameter: power mode
| ((!lua_isnumber(L, 3)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 3)&bit3)) << 2) // 2-nd parameter: pressure oversampling
| ((!lua_isnumber(L, 2)?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 2)&bit3)) << 5); // 1-st parameter: temperature oversampling

bme280_ossh = (!lua_isnumber(L, 4))?BME280_OVERSAMP_16X:(luaL_checkinteger(L, 4)&bit3); // 3-rd parameter: humidity oversampling

config = ((!lua_isnumber(L, 6)?BME280_STANDBY_TIME_20_MS:(luaL_checkinteger(L, 6)&bit3))<< 5) // 5-th parameter: inactive duration in normal mode
| ((!lua_isnumber(L, 7)?BME280_FILTER_COEFF_16:(luaL_checkinteger(L, 7)&bit3)) << 2); // 6-th parameter: IIR filter
// NODE_DBG("mode: %x\nhumidity oss: %x\nconfig: %x\n", bme280_mode, bme280_ossh, config);

#define r16uLE_buf(reg) (uint16_t)((reg[1] << 8) | reg[0])
#define r16sLE_buf(reg) (int16_t)(r16uLE_buf(reg))
size_t reg_len;
const char *buf = luaL_checklstring(L, 1, &reg_len);

bme280_data = (bme280_data_p) memset(lua_newuserdata(L, sizeof(*bme280_data)), 0, sizeof(*bme280_data)); // first parameter to be returned
const uint8_t *reg;

reg = buf;
(*bme280_data).dig_T1 = r16uLE_buf(reg); reg+=2;
(*bme280_data).dig_T2 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_T3 = r16sLE_buf(reg); reg+=2;
// NODE_DBG("dig_T: %d\t%d\t%d\n", (*bme280_data).dig_T1, (*bme280_data).dig_T2, (*bme280_data).dig_T3);

(*bme280_data).dig_P1 = r16uLE_buf(reg); reg+=2;
(*bme280_data).dig_P2 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P3 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P4 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P5 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P6 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P7 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P8 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_P9 = r16sLE_buf(reg); reg+=2;
// NODE_DBG("dig_P: %d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", (*bme280_data).dig_P1, (*bme280_data).dig_P2,(*bme280_data).dig_P3, (*bme280_data).dig_P4, (*bme280_data).dig_P5, (*bme280_data).dig_P6, (*bme280_data).dig_P7,(*bme280_data).dig_P8, (*bme280_data).dig_P9);

if (reg_len>=6+18) { // is BME?
(*bme280_data).dig_H1 = (uint8)reg[0]; reg+=1;
(*bme280_data).dig_H2 = r16sLE_buf(reg); reg+=2;
(*bme280_data).dig_H3 = reg[0]; reg++;
(*bme280_data).dig_H4 = (int16_t)reg[0] << 4 | (reg[1] & 0x0F); reg+=1; // H4[11:4 3:0] = 0xE4[7:0] 0xE5[3:0] 12-bit signed
(*bme280_data).dig_H5 = (int16_t)reg[1] << 4 | (reg[0] >> 4); reg+=2; // H5[11:4 3:0] = 0xE6[7:0] 0xE5[7:4] 12-bit signed
(*bme280_data).dig_H6 = (int8_t)reg[0];
NODE_DBG("dig_H: %d\t%d\t%d\t%d\t%d\t%d\n", (*bme280_data).dig_H1, (*bme280_data).dig_H2, (*bme280_data).dig_H3, (*bme280_data).dig_H4, (*bme280_data).dig_H5, (*bme280_data).dig_H6);
}
#undef r16uLE_buf
#undef r16sLE_buf

int i = 1;
char cfg[2]={'\0', '\0'};
lua_createtable(L, 3, 0); /* configuration table */
cfg[0]=(char)config;
lua_pushstring(L, cfg);
lua_rawseti(L, -2, i++);
cfg[0]=(char)bme280_ossh;
lua_pushstring(L, cfg);
lua_rawseti(L, -2, i++);
cfg[0]=(char)bme280_mode;
lua_pushstring(L, cfg);
lua_rawseti(L, -2, i);
return 2;
}

// Return T, QFE, H if no altitude given
// Return T, QFE, H, QNH if altitude given
int bme280_lua_read(lua_State* L) {
double qfe;

bme280_data = (bme280_data_p)lua_touserdata(L, 1);

size_t reg_len;
const char *buf = luaL_checklstring(L, 2, &reg_len); // registers are P[3], T[3], H[2]

if (reg_len != 8 && reg_len !=6) {
luaL_error(L, "invalid readout data");
}

uint8_t calc_qnh = lua_isnumber(L, 3);

// Must do Temp first since bme280_t_fine is used by the other compensation functions
uint32_t adc_T = (uint32_t)(((buf[3] << 16) | (buf[4] << 8) | buf[5]) >> 4);
if (adc_T == 0x80000 || adc_T == 0xfffff)
return 0;
lua_pushnumber(L, bme280_compensate_T(adc_T)/100.0);

uint32_t adc_P = (uint32_t)(((buf[0] << 16) | (buf[1] << 8) | buf[2]) >> 4);
NODE_DBG("adc_P: %d\n", adc_P);
if (adc_P ==0x80000 || adc_P == 0xfffff) {
lua_pushnil(L);
calc_qnh = 0;
} else {
qfe = bme280_compensate_P(adc_P)/1000.0;
lua_pushnumber (L, qfe);
}

uint32_t adc_H = (uint32_t)((buf[6] << 8) | buf[7]);
if (reg_len!=8 || adc_H == 0x8000 || adc_H == 0xffff)
lua_pushnil(L);
else
lua_pushnumber (L, bme280_compensate_H(adc_H)/1000.0);

if (calc_qnh) { // have altitude
int32_t h = luaL_checknumber(L, 3);
double qnh = bme280_qfe2qnh(qfe, h);
lua_pushnumber (L, qnh);
return 4;
}
return 3;
}

int bme280_lua_qfe2qnh(lua_State* L) {
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
lua_remove(L, 1);
}
double qfe = luaL_checknumber(L, 1);
double h = luaL_checknumber(L, 2);
double qnh = bme280_qfe2qnh(qfe, h);
lua_pushnumber(L, qnh);
return 1;
}

int bme280_lua_altitude(lua_State* L) {
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
lua_remove(L, 1);
}
double P = luaL_checknumber(L, 1);
double qnh = luaL_checknumber(L, 2);
double h = (1.0 - pow((double)P/(double)qnh, 1.0/5.25588)) / 2.25577e-5;
lua_pushnumber (L, h);
return 1;
}

int bme280_lua_dewpoint(lua_State* L) {
if (lua_isuserdata(L, 1) || lua_istable(L, 1)) { // allow to call it as object method, userdata have no use here
lua_remove(L, 1);
}
double H = luaL_checknumber(L, 1)/100.0; // percent
double T = luaL_checknumber(L, 2);

const double c243 = 243.5;
const double c17 = 17.67;
double c = ln(H) + ((c17 * T) / (c243 + T));
double d = (c243 * c)/(c17 - c);

lua_pushnumber (L, d);
return 1;
}

LROT_BEGIN(bme280_math, NULL, 0)
LROT_FUNCENTRY( setup, bme280_lua_setup )
LROT_FUNCENTRY( read, bme280_lua_read )
LROT_FUNCENTRY( qfe2qnh, bme280_lua_qfe2qnh )
LROT_FUNCENTRY( altitude, bme280_lua_altitude )
LROT_FUNCENTRY( dewpoint, bme280_lua_dewpoint )
LROT_END(bme280_math, NULL, 0)


NODEMCU_MODULE(BME280_MATH, "bme280_math", bme280_math, NULL);
Loading