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[进阶] BMP388传感器如何和UNO SPI接线？

csPin接uno的任意其他数字引脚即可，这里选择4号引脚，传感器CSB接UNO D4。

代码：
/*!
 * @file  interruptDataDrdy.ino
 * @brief  Demonstrate ready data (temperature/pressure) interrupt
 * @details  When measured data, the sensor will generate a 2.5 ms pulse signal by INT in the non-interrupt 
 * [url=home.php?mod=space&uid=821650]@N[/url]  register locked state.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  [qsjhyy](yihuan.huang@dfrobot.com)
 * @version  V1.0
 * @date  2021-04-30
 * @url  https://github.com/DFRobot/DFRobot_BMP3XX
 */
#include <DFRobot_BMP3XX.h>

/**
 * Select chip version BMP388/BMP390L
 * Select I2C communication interface, please comment out SPI interface.
 * I2C 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 I2C communication address is: 0×77(eSDOVDD)
 */
//DFRobot_BMP388_I2C sensor(&Wire, sensor.eSDOVDD);
//DFRobot_BMP390L_I2C sensor(&Wire, sensor.eSDOVDD);

/**
 * Select the chip version BMP388/BMP390L
 * Select I2C 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 = 4;
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*/1,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");
  }
}
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