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- /*
- * Driver for TI Texas Instruments HDC1080 Temperature/Humidity Sensor.
- * Code By Metin KOC
- * Sixfab Inc. metin@sixfab.com
- * Code based on ADXL345 driver.
- */
- #include "module.h"
- #include "lauxlib.h"
- #include "platform.h"
- #include "c_stdlib.h"
- #include "c_string.h"
- #include "c_math.h"
- static const uint32_t hdc1080_i2c_id = 0;
- static const uint8_t hdc1080_i2c_addr = 0x40;
- #define HDC1080_TEMPERATURE_REGISTER 0X00
- #define HDC1080_HUMIDITY_REGISTER 0X01
- #define HDC1080_CONFIG_REGISTER 0X02
- static int hdc1080_setup(lua_State* L) {
- // Configure Sensor
- platform_i2c_send_start(hdc1080_i2c_id);
- platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
- platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_CONFIG_REGISTER);
- platform_i2c_send_byte(hdc1080_i2c_id, 0x05); //Bit[10] to 1 for 11 bit resolution , Set Bit[9:8] to 01 for 11 bit resolution.
- platform_i2c_send_byte(hdc1080_i2c_id, 0x00);
- platform_i2c_send_stop(hdc1080_i2c_id);
-
- return 0;
- }
- static int hdc1080_init(lua_State* L) {
- uint32_t sda;
- uint32_t scl;
-
- platform_print_deprecation_note("hdc1080.init() is replaced by hdc1080.setup()", "in the next version");
-
- if (!lua_isnumber(L, 1) || !lua_isnumber(L, 2)) {
- return luaL_error(L, "wrong arg range");
- }
- sda = luaL_checkinteger(L, 1);
- scl = luaL_checkinteger(L, 2);
-
- if (scl == 0 || sda == 0) {
- return luaL_error(L, "no i2c for D0");
- }
- platform_i2c_setup(hdc1080_i2c_id, sda, scl, PLATFORM_I2C_SPEED_SLOW);
-
- // remove sda and scl parameters from stack
- lua_remove(L, 1);
- lua_remove(L, 1);
-
- return hdc1080_setup(L);
- }
- static int hdc1080_read(lua_State* L) {
- uint8_t data[2];
-
- #ifdef LUA_NUMBER_INTEGRAL
- int temp;
- int humidity;
- #else
- float temp;
- float humidity;
- #endif
-
- int i;
- platform_i2c_send_start(hdc1080_i2c_id);
- platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
- platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_TEMPERATURE_REGISTER);
- platform_i2c_send_stop(hdc1080_i2c_id);
- os_delay_us(7000);
- platform_i2c_send_start(hdc1080_i2c_id);
- platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
- for (i=0; i<2; i++) {
- data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1);
- }
- platform_i2c_send_stop(hdc1080_i2c_id);
- #ifdef LUA_NUMBER_INTEGRAL
- temp = ((((data[0]<<8)|data[1])*165)>>16)-40;
- lua_pushinteger(L, (int)temp);
- #else
- temp = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*165.0f-40.0f;
- lua_pushnumber(L, temp);
- #endif
-
-
- platform_i2c_send_start(hdc1080_i2c_id);
- platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
- platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_HUMIDITY_REGISTER);
- platform_i2c_send_stop(hdc1080_i2c_id);
- os_delay_us(7000);
- platform_i2c_send_start(hdc1080_i2c_id);
- platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
- for (i=0; i<2; i++) {
- data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1);
- }
- platform_i2c_send_stop(hdc1080_i2c_id);
- #ifdef LUA_NUMBER_INTEGRAL
- humidity = ((((data[0]<<8)|data[1]))*100)>>16;
- lua_pushinteger(L, (int)humidity);
- #else
- humidity = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*100.0f;
- lua_pushnumber(L, humidity);
- #endif
-
- return 2;
- }
- static const LUA_REG_TYPE hdc1080_map[] = {
- { LSTRKEY( "read" ), LFUNCVAL( hdc1080_read )},
- { LSTRKEY( "setup" ), LFUNCVAL( hdc1080_setup )},
- { LSTRKEY( "init" ), LFUNCVAL( hdc1080_init )},
- { LNILKEY, LNILVAL}
- };
- NODEMCU_MODULE(HDC1080, "hdc1080", hdc1080_map, NULL);
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