Example Code for Arduino-Data interrupt function
Data interrupt function
Hardware Preparation
- Firebeetle Board-M0 x 1
- BMP390L digital barometric pressure sensor × 1
- Jumper wires
Software Preparation
- Arduino IDE
- Download and install the Library files and sample programs. (About how to install the library?)
- Or get Library files from Arduino :
Wiring Diagram
Sample Code
-
Choose interruptDataDrdy.ino
-
Burning program
/*!
* @file interruptDataDrdy.ino
* @brief Demonstrate ready data (temperature/pressure) interrupt
* @n When measured data, the sensor will generate a 2.5 ms pulse signal by INT in the non-interrupt
* @n register locked state.
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @licence The MIT License (MIT)
* @author [qsj]([email protected])
* @version V0.1
* @date 2021-4-30
* @get from https://www.dfrobot.com
* @url https://github.com/DFRobot/DFRobot_BMP3XX
*/
#include <DFRobot_BMP3XX.h>
/**
* Select chip version BMP388/BMP390L
* Select IIC communication interface, please comment out SPI interface.
* IIC communication address settings: eSDOGND: connect SDO pin to GND, I2C address is 0×76 now.
* eSDOVDD: Connect SDO pin to VDDIO (3v3), I2C address is 0×77 now
* Notice: If using Gravity products, default IIC communication address is: 0×77（eSDOVDD）
*/
//DFRobot_BMP388_IIC sensor(&Wire, sensor.eSDOVDD);
DFRobot_BMP390L_IIC sensor(&Wire, sensor.eSDOVDD);
/**
* Select the chip version BMP388/BMP390L
* Select IIC communication interface, please comment out SPI interface.
* Set up digital pin according to the on-board pin connected with SPI chip-select pin.
* Notice: csPin used here is D3 digital pin on ESP32, other non-conflicting pins can also be selected
* as external interrupt pins.
*/
// uint8_t csPin = D3;
// DFRobot_BMP388_SPI sensor(&SPI, csPin);
// DFRobot_BMP390L_SPI sensor(&SPI, csPin);
/* If you do not need to eliminate the absolute difference of measurement, please comment the following line */
#define CALIBRATE_ABSOLUTE_DIFFERENCE
/* Interrupt flag */
volatile uint8_t flag = 0;
/* External interrupt flag */
void interrupt()
{
if(flag ==0){
flag = 1;
}
}
void setup(void)
{
Serial.begin(115200);
int rslt;
while( ERR_OK != (rslt = sensor.begin()) ){
if(ERR_DATA_BUS == rslt){
Serial.println("Data bus error!!!");
}else if(ERR_IC_VERSION == rslt){
Serial.println("Chip versions do not match!!!");
}
delay(3000);
}
Serial.println("Begin ok!");
/**
* Interrupt configuration
* mode The interrupt mode needs to set. The following modes add up to mode:
* Interrupt pin output mode: eINTPinPP: Push pull, eINTPinOD: Open drain
* Interrupt pin active level: eINTPinActiveLevelLow: Active low, eINTPinActiveLevelHigh: Active high
* Register interrupt latch: eINTLatchDIS: Disable, eINTLatchEN: Enable
* FIFO water level reached interrupt: eINTFWTMDIS: Disable, eINTFWTMEN: Enable
* FIFO full interrupt: eINTFFullDIS: Disable, eINTFFullEN: Enable
* Interrupt pin initial (invalid, non-interrupt) level: eINTInitialLevelLOW: Low, eINTInitialLevelHIGH: High
* Temperature/pressure data ready interrupt: eINTDataDrdyDIS: Disable, eINTDataDrdyEN: Enable
* Notice: In non-latching mode (eINTLatchDIS), interrupt signal is 2.5 ms pulse signal
* Note: When using eINTPinActiveLevelLow (Active low interrupt pin), you need to use eINTInitialLevelHIGH (Initial
* level of interrupt pin is high). Please use “FALLING” to trigger the following interrupt.
* When using eINTPinActiveLevelHigh (Active low interrupt pin), you need to use eINTInitialLevelLOW (Initial
* level of interrupt pin is high). Please use “RISING” to trigger the following interrupt.
*/
sensor.setINTMode(sensor.eINTPinPP +
sensor.eINTPinActiveLevelHigh +
sensor.eINTLatchDIS +
sensor.eINTFWTMDIS +
sensor.eINTFFullDIS +
sensor.eINTInitialLevelLOW +
sensor.eINTDataDrdyEN);
delay(100);
#ifdef CALIBRATE_ABSOLUTE_DIFFERENCE
/**
* Calibrate the sensor according to the current altitude
* In this example, we use an altitude of 540 meters in Wenjiang District of Chengdu (China).
* Please change to the local altitude when using it.
* If this interface is not called, the measurement data will not eliminate the absolute difference
* Note: This interface is only valid for the first call
*/
if( sensor.calibratedAbsoluteDifference(540.0) ){
Serial.println("Absolute difference base value set successfully!");
}
#endif
#if defined(ESP32) || defined(ESP8266)
//D6 pin is used as interrupt pin by default, other non-conflicting pins can also be selected as external
//interrupt pins.
attachInterrupt(digitalPinToInterrupt(D6)/*Query the interrupt number of the D6 pin*/,interrupt,CHANGE);
#elif defined(ARDUINO_SAM_ZERO)
//Pin 5 is used as interrupt pin by default, other non-conflicting pins can also be selected as external
// interrupt pins
attachInterrupt(digitalPinToInterrupt(5)/*Query the interrupt number of the 5 pin*/,interrupt,CHANGE);
#else
/* The Correspondence Table of AVR Series Arduino Interrupt Pins And Terminal Numbers
* ---------------------------------------------------------------------------------------
* | | DigitalPin | 2 | 3 | |
* | Uno, Nano, Mini, other 328-based |--------------------------------------------|
* | | Interrupt No | 0 | 1 | |
* |-------------------------------------------------------------------------------------|
* | | Pin | 2 | 3 | 21 | 20 | 19 | 18 |
* | Mega2560 |--------------------------------------------|
* | | Interrupt No | 0 | 1 | 2 | 3 | 4 | 5 |
* |-------------------------------------------------------------------------------------|
* | | Pin | 3 | 2 | 0 | 1 | 7 | |
* | Leonardo, other 32u4-based |--------------------------------------------|
* | | Interrupt No | 0 | 1 | 2 | 3 | 4 | |
* |--------------------------------------------------------------------------------------
*/
/* The Correspondence Table of micro:bit Interrupt Pins And Terminal Numbers
* ---------------------------------------------------------------------------------------------------------------------------------------------
* | micro:bit | DigitalPin |P0-P20 can be used as an external interrupt |
* | (When using as an external interrupt, |---------------------------------------------------------------------------------------------|
* |no need to set it to input mode with pinMode)|Interrupt No|Interrupt number is a pin digital value, such as P0 interrupt number 0, P1 is 1 |
* |-------------------------------------------------------------------------------------------------------------------------------------------|
*/
attachInterrupt(/*Interrupt No*/0,interrupt,CHANGE);//Open the external interrupt 0, connect INT1/2 to the digital pin of the main control:
//UNO(2), Mega2560(2), Leonardo(3), microbit(P0).
#endif
/* Get the sampling period of the current measurement mode, unit: us */
float sampingPeriodus = sensor.getSamplingPeriodUS();
Serial.print("samping period : ");
Serial.print(sampingPeriodus);
Serial.println(" us");
/* Get the sampling frequency of the current measurement mode, unit: Hz */
float sampingFrequencyHz = 1000000 / sampingPeriodus;
Serial.print("samping frequency : ");
Serial.print(sampingFrequencyHz);
Serial.println(" Hz");
Serial.println();
delay(1000);
}
void loop()
{
if(flag == 1){
flag = 0;
/* When data is ready and the interrupt is triggered, read altitude, unit: m */
float altitude = sensor.readAltitudeM();
Serial.print("Altitude : ");
Serial.print(altitude);
Serial.println(" m");
}
}
Result
Additional Information
**Notice: **The tutorial example uses an altitude of 540 meters in Wenjiang District, Chengdu (China). Please change to the local altitude calibration when actually using it.
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