56 lines
1.8 KiB
Markdown
56 lines
1.8 KiB
Markdown
# Driver for BMP085/BMP180 digital pressure sensor
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This driver is written for usage with the ESP8266 and FreeRTOS ([esp-open-rtos](https://github.com/SuperHouse/esp-open-rtos) and [esp-open-rtos-driver-i2c](https://github.com/kanflo/esp-open-rtos-driver-i2c)).
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### Usage
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Before using the BMP180 module, the function `bmp180_init(SCL_PIN, SDA_PIN)` needs to be called to setup the I2C interface and do validation if the BMP180/BMP085 is accessible.
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If the setup is sucessfully and a measurement is triggered, the result of the measurement is provided to the user as an event send via the `qQueue` provided with `bmp180_trigger_*measurement(pQueue);`
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#### Example
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```
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#define SCL_PIN GPIO_ID_PIN(0)
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#define SDA_PIN GPIO_ID_PIN(2)
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...
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if (!bmp180_init(SCL_PIN, SDA_PIN)) {
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// An error occured, while dong the init (E.g device not found etc.)
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}
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// Trigger a measurement
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bmp180_trigger_measurement(pQueue);
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```
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#### Change queue event
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Per default the event send to the user via the provided queue is of the type `bmp180_result_t`. As this might not always be desired, a way is provided so that the user can provide a function, which creates and sends the event via the provided queue.
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As all data aqquired from the BMP180/BMP085 is provided to the `bmp180_informUser` function, it is also possible to calculate new informations (E.g altitude etc.)
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##### Example
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```
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// Own BMP180 User Inform Implementation
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bool my_informUser(const xQueueHandle* resultQueue, uint8_t cmd, bmp180_temp_t temperature, bmp180_press_t pressure) {
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my_event_t ev;
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ev.event_type = MY_EVT_BMP180;
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ev.bmp180_data.cmd = cmd;
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ev.bmp180_data.temperature = temperature;
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ev.bmp180_data.pressure = pressure;
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return (xQueueSend(*resultQueue, &ev, 0) == pdTRUE);
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}
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...
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// Use our user inform implementation
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// needs to be set before first measurement is triggered
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bmp180_informUser = my_informUser;
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```
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