arduino due与arduino mega 2560的I2C连接

Question

我正在尝试与每一个I2C的应付款进行接口。我所做的是：

shared.

• SCL/SDA on mega 2560 (非20/21)与SCL1 1/SDA1 1在到期时连接。SCL/SDA (20/21)连接到工作良好的imu bno055。

• 无拉电阻连接。

。

在巨无霸上，我会：

#include <Time.h>
#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <EasyTransferI2C.h>

EasyTransferI2C ET_GPS_data; 
struct SEND_DATA_STRUCTURE{
  double GPS_la;
  double GPS_lo;
  double GPS_alt;
};

SEND_DATA_STRUCTURE GPS_data;
#define I2C_SLAVE_ADDRESS 9

SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);

double GPS_la = 0.0;
double GPS_lo = 0.0;
double GPS_alt = 0.0;
#define GPS_Sampling_Time_ms 20
unsigned long currentMillis_GPS = 0;
unsigned long previousMillis_GPS = 0;

void getGPS();

void setup() {
  mySerial.begin(9600);
  Wire.begin();

  // ******** Initialize sim808 module *************
  while(!sim808.init())
  {
     delay(1000);
  }
  delay(3000);

  if(sim808.attachGPS()){
     //Serial.println("Open the GPS power success");
  }else{
     //Serial.println("Open the GPS power failure");
  }
  ET_GPS_data.begin(details(GPS_data), &Wire);

}

void loop() {
  currentMillis_GPS = millis();
  if (currentMillis_GPS - previousMillis_GPS > GPS_Sampling_Time_ms) {
    getGPS();
    sim808.detachGPS();
    previousMillis_GPS = currentMillis_GPS;
    ET_GPS_data.sendData(I2C_SLAVE_ADDRESS);
  }
  GPS_data.GPS_la = GPS_la;
  GPS_data.GPS_lo = GPS_lo;
  GPS_data.GPS_alt = GPS_alt;
}

void getGPS(){ 
  while(!sim808.attachGPS()){}
  delay(80);
    
  while(!sim808.getGPS()){}
  GPS_la = sim808.GPSdata.lat;
  GPS_lo = sim808.GPSdata.lon;
  GPS_alt = sim808.GPSdata.altitude;
}

到期时：

#include <Arduino.h>
#include <Wire.h>
#include <EasyTransferI2C.h>
EasyTransferI2C ET_GPS_data; 
struct RECEIVE_DATA_STRUCTURE{
  double GPS_la;
  double GPS_lo;
  double GPS_alt;
};
RECEIVE_DATA_STRUCTURE GPS_data;
double GPS_la = 0.1;
double GPS_lo = 0.1;
double GPS_alt = 0.1;
#define GPS_Sampling_Time_ms 100
unsigned long currentMillis_GPS = 0;
unsigned long previousMillis_GPS = 0;

void setup() {
 Serial.begin(57600);
 Wire1.begin(I2C_SLAVE_ADDRESS);
 ET_GPS_data.begin(details(GPS_data), &Wire1);
 Wire1.onReceive(receive);
}

void loop() {
if(ET_GPS_data.receiveData()){
    GPS_la = GPS_data.GPS_la;
    GPS_lo = GPS_data.GPS_lo;
    GPS_alt = GPS_data.GPS_alt;
    Serial.println(GPS_alt);
  }
}

没有i2c，两个板都能正常工作。我做错了什么？这仅仅是因为我没有拉电阻吗？如果是，我该如何添加？

编辑:我走了另一条路，转而使用了串行连接。

Answer 1

首先，尝试在任何I2C连接中设置拉电阻，其次，您应该注意，到期运行在3.3V，Mega运行在5V。因此，在这两个I2C器件之间应该有一个电压电平移位器(3.3V到5V)。