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nodemcu-firmware/app/modules/si7021.c

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//***************************************************************************
// Si7021 module for ESP8266 with nodeMCU
// fetchbot @github
// MIT license, http://opensource.org/licenses/MIT
//***************************************************************************
#include "module.h"
#include "lauxlib.h"
#include "platform.h"
#include "osapi.h"
//***************************************************************************
// I2C ADDRESS DEFINITON
//***************************************************************************
#define SI7021_I2C_ADDRESS (0x40)
//***************************************************************************
// COMMAND DEFINITON
//***************************************************************************
#define SI7021_CMD_MEASURE_RH_HOLD (0xE5)
#define SI7021_CMD_MEASURE_RH_NOHOLD (0xF5)
#define SI7021_CMD_MEASURE_TEMP_HOLD (0xE3)
#define SI7021_CMD_MEASURE_TEMP_NOHOLD (0xF3)
#define SI7021_CMD_READ_PREV_TEMP (0xE0)
#define SI7021_CMD_RESET (0xFE)
#define SI7021_CMD_WRITE_RHT_REG (0xE6)
#define SI7021_CMD_READ_RHT_REG (0xE7)
#define SI7021_CMD_WRITE_HEATER_REG (0x51)
#define SI7021_CMD_READ_HEATER_REG (0x11)
#define SI7021_CMD_ID1 (0xFA0F)
#define SI7021_CMD_ID2 (0xFCC9)
#define SI7021_CMD_FIRM_REV (0x84B8)
//***************************************************************************
// REGISTER DEFINITON
//***************************************************************************
#define SI7021_RH12_TEMP14 (0x00)
#define SI7021_RH08_TEMP12 (0x01)
#define SI7021_RH10_TEMP13 (0x80)
#define SI7021_RH11_TEMP11 (0x81)
#define SI7021_HEATER_ENABLE (0x04)
#define SI7021_HEATER_DISABLE (0x00)
//***************************************************************************
static const uint32_t si7021_i2c_id = 0;
static uint8_t si7021_i2c_addr = SI7021_I2C_ADDRESS;
static uint8_t si7021_res = 0x00;
static uint8_t si7021_config = 0x3A;
static uint8_t si7021_heater = 0x00;
static uint8_t si7021_heater_setting = 0x00;
static uint8_t write_byte(uint8_t reg) {
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(si7021_i2c_id, reg);
platform_i2c_send_stop(si7021_i2c_id);
}
static uint8_t write_reg(uint8_t reg, uint8_t data) {
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(si7021_i2c_id, reg);
platform_i2c_send_byte(si7021_i2c_id, data);
platform_i2c_send_stop(si7021_i2c_id);
}
static uint8_t read_reg(uint8_t reg, uint8_t *buf, uint8_t size) {
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(si7021_i2c_id, reg);
platform_i2c_send_stop(si7021_i2c_id);
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
os_delay_us(25000);
while (size-- > 0)
*buf++ = platform_i2c_recv_byte(si7021_i2c_id, size > 0);
platform_i2c_send_stop(si7021_i2c_id);
return 1;
}
static uint8_t read_serial(uint16_t reg, uint8_t *buf, uint8_t size) {
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
platform_i2c_send_byte(si7021_i2c_id, (uint8_t)(reg >> 8));
platform_i2c_send_byte(si7021_i2c_id, (uint8_t)(reg & 0xFF));
// platform_i2c_send_stop(si7021_i2c_id);
platform_i2c_send_start(si7021_i2c_id);
platform_i2c_send_address(si7021_i2c_id, si7021_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
while (size-- > 0)
*buf++ = platform_i2c_recv_byte(si7021_i2c_id, size > 0);
platform_i2c_send_stop(si7021_i2c_id);
return 1;
}
// CRC8
uint8_t si7021_crc8(uint8_t crc, uint8_t *buf, uint8_t size) {
while (size--) {
crc ^= *buf++;
for (uint8_t i = 0; i < 8; i++) {
if (crc & 0x80) {
crc = (crc << 1) ^ 0x31;
} else crc <<= 1;
}
}
return crc;
}
static int si7021_lua_setup(lua_State* L) {
write_byte(SI7021_CMD_RESET);
os_delay_us(50000);
// check for device on i2c bus
uint8_t buf_r[1];
read_reg(SI7021_CMD_READ_RHT_REG, buf_r, 1);
if (buf_r[0] != 0x3A)
return luaL_error(L, "found no device");
return 0;
}
// Change sensor settings and returns them
// Lua: res, vdds, heater[, heater_set] = si7021.settings(RESOLUTION[,HEATER,HEATER_SETTING])
static int si7021_lua_setting(lua_State* L) {
// check variable
if (!lua_isnumber(L, 1)) {
return luaL_error(L, "wrong arg range");
}
si7021_res = luaL_checkinteger(L, 1);
if (!((si7021_res == SI7021_RH12_TEMP14) || (si7021_res == SI7021_RH08_TEMP12) || (si7021_res == SI7021_RH10_TEMP13) || (si7021_res == SI7021_RH11_TEMP11))) {
return luaL_error(L, "Invalid argument: resolution");
}
si7021_config = (si7021_res | 0x3A);
write_reg(SI7021_CMD_WRITE_RHT_REG,si7021_config);
// Parse optional parameters
if (lua_isnumber(L, 2)) {
if (!lua_isnumber(L, 2) || !lua_isnumber(L, 3)) {
return luaL_error(L, "wrong arg range");
}
si7021_heater = luaL_checkinteger(L, 2);
if (!((si7021_heater == SI7021_HEATER_ENABLE) || (si7021_heater == SI7021_HEATER_DISABLE))) {
return luaL_error(L, "Invalid argument: heater");
}
si7021_heater_setting = luaL_checkinteger(L, 3);
if ((si7021_heater_setting < 0x00) || (si7021_heater_setting > 0x0F)) {
return luaL_error(L, "Invalid argument: heater_setting");
}
si7021_config = (si7021_res | si7021_heater | 0x3A);
write_reg(SI7021_CMD_WRITE_RHT_REG,si7021_config);
write_reg(SI7021_CMD_WRITE_HEATER_REG,(si7021_heater_setting & 0x0F));
}
uint8_t buf_c[1];
uint8_t buf_h[1];
read_reg(SI7021_CMD_READ_RHT_REG, buf_c, 1);
read_reg(SI7021_CMD_READ_HEATER_REG, buf_h, 1);
lua_pushinteger(L, ((buf_c[0] >> 6) + (buf_c[0] & 0x01)));
lua_pushinteger(L, ((buf_c[0] >> 6) & 0x01));
lua_pushinteger(L, ((buf_c[0] >> 2) & 0x01));
lua_pushinteger(L, (buf_h[0] & 0x0F));
return 4;
}
// Reads sensor values from device and returns them
// Lua: hum, temp, humdec, tempdec = si7021.read()
static int si7021_lua_read(lua_State* L) {
uint8_t buf_h[3]; // first two byte data, third byte crc
read_reg(SI7021_CMD_MEASURE_RH_HOLD, buf_h, 3);
if (buf_h[2] != si7021_crc8(0, buf_h, 2)) //crc check
return luaL_error(L, "crc error");
lua_Float hum = (uint16_t)((buf_h[0] << 8) | buf_h[1]);
hum = ((hum * 125) / 65536 - 6);
int humdec = (int)((hum - (int)hum) * 1000);
uint8_t buf_t[2]; // two byte data, no crc on combined temp measurement
read_reg(SI7021_CMD_READ_PREV_TEMP, buf_t, 2);
lua_Float temp = (uint16_t)((buf_t[0] << 8) | buf_t[1]);
temp = ((temp * 175.72) / 65536 - 46.85);
int tempdec = (int)((temp - (int)temp) * 1000);
lua_pushnumber(L, hum);
lua_pushnumber(L, temp);
lua_pushinteger(L, humdec);
lua_pushinteger(L, tempdec);
return 4;
}
// Reads electronic serial number from device and returns them
// Lua: serial = si7021.serial()
static int si7021_lua_serial(lua_State* L) {
uint32_t serial_a;
uint8_t crc = 0;
uint8_t buf_s_1[8]; // every second byte contains crc
read_serial(SI7021_CMD_ID1, buf_s_1, 8);
for(uint8_t i = 0; i <= 6; i+=2) {
crc = si7021_crc8(crc, buf_s_1+i, 1);
if (buf_s_1[i+1] != crc)
return luaL_error(L, "crc error");
serial_a = (serial_a << 8) + buf_s_1[i];
}
uint32_t serial_b;
crc = 0;
uint8_t buf_s_2[6]; // every third byte contains crc
read_serial(SI7021_CMD_ID2, buf_s_2, 6);
for(uint8_t i = 0; i <=3; i+=3) {
crc = si7021_crc8(crc, buf_s_2+i, 2);
if (buf_s_2[i+2] != crc)
return luaL_error(L, "crc error");
serial_b = (serial_b << 16) + (buf_s_2[i] << 8) + buf_s_2[i+1];
}
lua_pushinteger(L, serial_a);
lua_pushinteger(L, serial_b);
return 2;
}
// Reads electronic firmware revision from device and returns them
// Lua: firmware = si7021.firmware()
static int si7021_lua_firmware(lua_State* L) {
uint8_t firmware;
uint8_t buf_f[1];
read_serial(SI7021_CMD_FIRM_REV, buf_f, 1);
firmware = buf_f[0];
lua_pushinteger(L, firmware);
return 1;
}
LROT_BEGIN(si7021, NULL, 0)
LROT_FUNCENTRY( setup, si7021_lua_setup )
LROT_FUNCENTRY( setting, si7021_lua_setting )
LROT_FUNCENTRY( read, si7021_lua_read )
LROT_FUNCENTRY( serial, si7021_lua_serial )
LROT_FUNCENTRY( firmware, si7021_lua_firmware )
LROT_NUMENTRY( RH12_TEMP14, SI7021_RH12_TEMP14 )
LROT_NUMENTRY( RH08_TEMP12, SI7021_RH08_TEMP12 )
LROT_NUMENTRY( RH10_TEMP13, SI7021_RH10_TEMP13 )
LROT_NUMENTRY( RH11_TEMP11, SI7021_RH11_TEMP11 )
LROT_NUMENTRY( HEATER_ENABLE, SI7021_HEATER_ENABLE )
LROT_NUMENTRY( HEATER_DISABLE, SI7021_HEATER_DISABLE )
LROT_END(si7021, NULL, 0)
NODEMCU_MODULE(SI7021, "si7021", si7021, NULL);
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