05bbe48bd4
An application using multiple I2C devices will need it's own loop. This reworks the code to make the detection, calibration constant loading, and measurment functions available too without having to use the bmp810 task which is still retained. Adds support for oversampling. Fixes a bug in the calculation of the temperature. Better error handling. Checks for I2C errors and errors in the loading of the calibration constants and propagates these up.
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* bmp180.h
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*
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* Created on: 23.08.2015
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* Author: fbargste
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*/
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#ifndef DRIVER_BMP180_H_
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#define DRIVER_BMP180_H_
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#include "stdint.h"
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#include "stdbool.h"
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#include "FreeRTOS.h"
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#include "queue.h"
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// Uncomment to enable debug output
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//#define BMP180_DEBUG
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#define BMP180_TEMPERATURE (1<<0)
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#define BMP180_PRESSURE (1<<1)
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//
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// Create bmp180_types
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//
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// temperature in °C
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typedef float bmp180_temp_t;
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// pressure in mPa (To get hPa divide by 100)
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typedef uint32_t bmp180_press_t;
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// BMP180_Event_Result
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typedef struct
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{
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uint8_t cmd;
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bmp180_temp_t temperature;
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bmp180_press_t pressure;
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} bmp180_result_t;
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// Init bmp180 driver ...
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bool bmp180_init(uint8_t scl, uint8_t sda);
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// Trigger a "complete" measurement (temperature and pressure will be valid when given to "bmp180_informUser)
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void bmp180_trigger_measurement(const xQueueHandle* resultQueue);
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// Trigger a "temperature only" measurement (only temperature will be valid when given to "bmp180_informUser)
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void bmp180_trigger_temperature_measurement(const xQueueHandle* resultQueue);
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// Trigger a "pressure only" measurement (only pressure will be valid when given to "bmp180_informUser)
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void bmp180_trigger_pressure_measurement(const xQueueHandle* resultQueue);
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// Give the user the chance to create it's own handler
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extern bool (*bmp180_informUser)(const xQueueHandle* resultQueue, uint8_t cmd, bmp180_temp_t temperature, bmp180_press_t pressure);
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// Calibration constants
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typedef struct
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{
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int16_t AC1;
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int16_t AC2;
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int16_t AC3;
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uint16_t AC4;
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uint16_t AC5;
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uint16_t AC6;
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int16_t B1;
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int16_t B2;
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int16_t MB;
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int16_t MC;
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int16_t MD;
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} bmp180_constants_t;
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// Returns true if the bmp180 is detected.
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bool bmp180_is_available();
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// Reads all the internal constants, returning true on success.
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bool bmp180_fillInternalConstants(bmp180_constants_t *c);
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// Reads an optional temperature and pressure. The over sampling
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// setting, oss, may be 0 to 3. Returns true on success.
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bool bmp180_measure(bmp180_constants_t *c, int32_t *temperature,
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uint32_t *pressure, uint8_t oss);
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#endif /* DRIVER_BMP180_H_ */
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