| Author | Rob Jansen, Copyright © 2024..2025, all rights reserved. |
| Adapted-by | |
| Compiler | 2.5r9 |
Library functions for the BMP180 pressure sensor. The main
program has to setup the IIC communication using an IIC clock of
at most 3.4 MHz.
Bosch BMP180 Datasheet version 2.5, document BST-BMP180-DS000-09.
No dependency found
const byte _BMP180_READ_PRESSURE_CMD = 0x34
var sword _bmp180_ac1, _bmp180_ac2, _bmp180_ac3
const byte BMP180_MODE_HIGH_RES = 2
const byte BMP180_MODE_STANDARD = 1
var byte _bmp180_oversampling
const byte _BMP180_REG_AC5 = 0xB2
var word _bmp180_ac4, _bmp180_ac5, _bmp180_ac6
const byte _BMP180_REG_SOFT_RESET = 0xE0
const byte _BMP180_REG_CTRL_MEAS = 0xF4
const byte BMP180_MODE_ULTRA_LOW_POWER = 0
const byte _BMP180_REG_MC = 0xBC
const byte BMP180_MODE_ULTRA_HIGH_RES = 3
const byte _BMP180_REG_AC4 = 0xB0
const byte _BMP180_REG_B2 = 0xB8
const byte _BMP180_REG_OUT_LSB = 0xF7
const byte _BMP180_REG_ID = 0xD0
const byte _BMP180_REG_MD = 0xBE
const byte _BMP180_REG_OUT_XLSB = 0xF8
const byte _BMP180_REG_AC6 = 0xB4
const byte _BMP180_REG_AC1 = 0xAA
const byte _BMP180_READ_TEMPERATURE_CMD = 0x2E
const byte _BMP180_REG_B1 = 0xB6
const byte _BMP180_IIC_ADDRESS = 0b1110_1110
const byte _BMP180_REG_MB = 0xBA
const byte _BMP180_REG_AC3 = 0xAE
const byte _BMP180_REG_AC2 = 0xAC
const byte _BMP180_REG_OUT_MSB = 0xF6
var sword _bmp180_b1, _bmp180_b2, _bmp180_mb, _bmp180_mc, _bmp180_md
bmp180_get_pressure() return sdword
bmp180_get_mode() return byte
bmp180_get_temperature() return sword
_read_raw_temperature() return dword
_bmp180_read_data_byte(byte in register) return byte
_read_raw_pressure() return dword
_bmp180_read_data_word(byte in register) return word
_bmp180_calculate_b5(sdword in raw_data) return sdword
const byte _BMP180_READ_PRESSURE_CMD = 0x34
No documentation found
var sword _bmp180_ac1, _bmp180_ac2, _bmp180_ac3
Calibration coefficients to be obtained from the EEPROM of the device.
const byte BMP180_MODE_HIGH_RES = 2
No documentation found
const byte BMP180_MODE_STANDARD = 1
No documentation found
var byte _bmp180_oversampling
Holds the resolution mode.
const byte _BMP180_REG_AC5 = 0xB2
No documentation found
var word _bmp180_ac4, _bmp180_ac5, _bmp180_ac6
No documentation found
const byte _BMP180_REG_SOFT_RESET = 0xE0
No documentation found
const byte _BMP180_REG_CTRL_MEAS = 0xF4
No documentation found
const byte BMP180_MODE_ULTRA_LOW_POWER = 0
Resolution modes and oversampling settings.
const byte _BMP180_REG_MC = 0xBC
No documentation found
const byte BMP180_MODE_ULTRA_HIGH_RES = 3
No documentation found
const byte _BMP180_REG_AC4 = 0xB0
No documentation found
const byte _BMP180_REG_B2 = 0xB8
No documentation found
const byte _BMP180_REG_OUT_LSB = 0xF7
Read only.
const byte _BMP180_REG_ID = 0xD0
Read only. Fixed value 0x55.
const byte _BMP180_REG_MD = 0xBE
No documentation found
const byte _BMP180_REG_OUT_XLSB = 0xF8
BMP180 register addresses. Control and data registers addresses. These are 8 bit addresses.
const byte _BMP180_REG_AC6 = 0xB4
No documentation found
const byte _BMP180_REG_AC1 = 0xAA
Calibration addressess This is a word address so register address is MSB.
const byte _BMP180_READ_TEMPERATURE_CMD = 0x2E
Commands.
const byte _BMP180_REG_B1 = 0xB6
No documentation found
const byte _BMP180_IIC_ADDRESS = 0b1110_1110
IIC write address (A0 = 0).
const byte _BMP180_REG_MB = 0xBA
No documentation found
const byte _BMP180_REG_AC3 = 0xAE
No documentation found
const byte _BMP180_REG_AC2 = 0xAC
No documentation found
const byte _BMP180_REG_OUT_MSB = 0xF6
Read only.
var sword _bmp180_b1, _bmp180_b2, _bmp180_mb, _bmp180_mc, _bmp180_md
No documentation found
bmp180_reset()
Description: Reset the BMP180 device Parameters: None
bmp180_init()
Description: Initialize the BMP180 library The resoluton mode is set to BMP180_MODE_ULTRA_LOW_POWER. Parameters: None Notes: The IIC interface must be initialized.
bmp180_set_mode(byte in mode)
Description: Set the resolution mode Parameters: mode - Resolution mode, see BMP180_MODE_xx.
_bmp180_write_data_byte(byte in register, byte in data)
Description: Write a byte to the given BMP180 register Parameters: register - register to write to data - data to be written
bmp180_get_pressure() return sdword
Description: Get the current pressure Parameters: None Returns: Pressure in Pascal (Pa) Notes: This is a blocking call. The delay is depending on the last selected resolution mode and can be longer than 31 ms. See datasheet.
bmp180_get_mode() return byte
Description: Get the current resolution mode Parameters: None Returns: Resolution mode, see BMP180_MODE_xx.
bmp180_get_temperature() return sword
Description: Get the current temperature Parameters: None Returns: Temperature in 0.1 degrees Celcius Notes: This is a blocking call. The delay is depending on the last selected resolution mode and is at least 4.5 ms. See datasheet.
_read_raw_temperature() return dword
Description: Read the raw temperature Parameters: None Returns: Raw temperature.
_bmp180_read_data_byte(byte in register) return byte
Description: Read a byte from the given BMP180 register Parameters: register - register to read from Returns: Data from register
_read_raw_pressure() return dword
Description: Read the raw pressure Parameters: None Returns: Raw pressure.
_bmp180_read_data_word(byte in register) return word
Description: Read a word from the given BMP180 register Parameters: register - register to read from Returns: Data from register Notes: The BMP180 stores data with Most Significant Byte (MSB) first.
_bmp180_calculate_b5(sdword in raw_data) return sdword
Description: Calculate the value of B5 Parameters: raw_data - raw data Returns: Value of B5 Notes: See datasheet figure 4.
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