hdc1080.c 3.0 KB

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  1. /*
  2. * Driver for TI Texas Instruments HDC1080 Temperature/Humidity Sensor.
  3. * Code By Metin KOC
  4. * Sixfab Inc. metin@sixfab.com
  5. * Code based on ADXL345 driver.
  6. */
  7. #include "module.h"
  8. #include "lauxlib.h"
  9. #include "platform.h"
  10. #include <stdlib.h>
  11. #include <string.h>
  12. #include <math.h>
  13. static const uint32_t hdc1080_i2c_id = 0;
  14. static const uint8_t hdc1080_i2c_addr = 0x40;
  15. #define HDC1080_TEMPERATURE_REGISTER 0X00
  16. #define HDC1080_HUMIDITY_REGISTER 0X01
  17. #define HDC1080_CONFIG_REGISTER 0X02
  18. static int hdc1080_setup(lua_State* L) {
  19. // Configure Sensor
  20. platform_i2c_send_start(hdc1080_i2c_id);
  21. platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
  22. platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_CONFIG_REGISTER);
  23. 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.
  24. platform_i2c_send_byte(hdc1080_i2c_id, 0x00);
  25. platform_i2c_send_stop(hdc1080_i2c_id);
  26. return 0;
  27. }
  28. static int hdc1080_read(lua_State* L) {
  29. uint8_t data[2];
  30. #ifdef LUA_NUMBER_INTEGRAL
  31. int temp;
  32. int humidity;
  33. #else
  34. float temp;
  35. float humidity;
  36. #endif
  37. int i;
  38. platform_i2c_send_start(hdc1080_i2c_id);
  39. platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
  40. platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_TEMPERATURE_REGISTER);
  41. platform_i2c_send_stop(hdc1080_i2c_id);
  42. os_delay_us(7000);
  43. platform_i2c_send_start(hdc1080_i2c_id);
  44. platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
  45. for (i=0; i<2; i++) {
  46. data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1);
  47. }
  48. platform_i2c_send_stop(hdc1080_i2c_id);
  49. #ifdef LUA_NUMBER_INTEGRAL
  50. temp = ((((data[0]<<8)|data[1])*165)>>16)-40;
  51. lua_pushinteger(L, (int)temp);
  52. #else
  53. temp = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*165.0f-40.0f;
  54. lua_pushnumber(L, temp);
  55. #endif
  56. platform_i2c_send_start(hdc1080_i2c_id);
  57. platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_TRANSMITTER);
  58. platform_i2c_send_byte(hdc1080_i2c_id, HDC1080_HUMIDITY_REGISTER);
  59. platform_i2c_send_stop(hdc1080_i2c_id);
  60. os_delay_us(7000);
  61. platform_i2c_send_start(hdc1080_i2c_id);
  62. platform_i2c_send_address(hdc1080_i2c_id, hdc1080_i2c_addr, PLATFORM_I2C_DIRECTION_RECEIVER);
  63. for (i=0; i<2; i++) {
  64. data[i] = platform_i2c_recv_byte(hdc1080_i2c_id, 1);
  65. }
  66. platform_i2c_send_stop(hdc1080_i2c_id);
  67. #ifdef LUA_NUMBER_INTEGRAL
  68. humidity = ((((data[0]<<8)|data[1]))*100)>>16;
  69. lua_pushinteger(L, (int)humidity);
  70. #else
  71. humidity = ((float)((data[0]<<8)|data[1])/(float)pow(2,16))*100.0f;
  72. lua_pushnumber(L, humidity);
  73. #endif
  74. return 2;
  75. }
  76. LROT_BEGIN(hdc1080)
  77. LROT_FUNCENTRY( read, hdc1080_read )
  78. LROT_FUNCENTRY( setup, hdc1080_setup )
  79. LROT_END( hdc1080, NULL, 0 )
  80. NODEMCU_MODULE(HDC1080, "hdc1080", hdc1080, NULL);