PROSAGA码农传奇-Arduino-使用Arduino Mega作为I2C Slave和RPi3

<div class =“post-text”itemprop =“text”>
  
    我一直在尝试通过I2C发送和接收从Raspberry Pi到Arduino的四个16位数字，并得到以下工作。
  
  
    请注意，我不是SMBus或I2C的专家，我不知道是否有更简单的方法可以做到这一点。如果有人知道的话，我很乐意收回我的答案！
  
  
    这是Raspberry Pi的代码，它只发送四个16位数字100,200,1000,10000然后再读回来。
  
   <pre>
 <code>
 #!/usr/bin/env python3
from smbus import SMBus
from time import sleep

bus = SMBus(1)
address = 0x08

def split(v):
    """Split 16-bit value into low and high bytes"""
    lobyte = v & 0xff
    hibyte = (v >> 8) & 0xff
    return lobyte, hibyte

def join(lo,hi):
 return lo | (hi << 8)

def Transmit():
    """Send 100, 200, 1000, 10000 on I2C"""
    a,b = split(100)
    c,d = split(200)
    e,f = split(1000)
    g,h = split(10000)
    bus.write_i2c_block_data(address, a,[b, c, d, e, f, g, h])

def Receive():
    block = bus.read_i2c_block_data(address, 0)
    i = join(block[0],block[1])
    j = join(block[2],block[3])
    k = join(block[4],block[5])
    l = join(block[6],block[7])
    print("{} {} {} {}".format(i,j,k,l))

Transmit()
sleep(1)
Receive()

</code>
 </pre>
  <HR />
  
    在Arduino方面，我只是从I2C中读取了4个16位数字，将它们存储在一个数组中并递增每个数字。当读取请求进入时，我发回四个递增的数字：
  
   <pre>
 <code>
 #include <Wire.h>

const int address= 8;

#define N 4

// Last four 16-bit values we received
int16_t values[N];

void setup() {
  Serial.begin(9600);
  Serial.print("Starting on i2c address:");
  Serial.println(address,DEC);
  Wire.begin(address);
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);
}

void loop() {
  delay(100);
}

// callback for when data are received
void receiveEvent(int nBytes) {
  Serial.print("Received: ");
  Serial.println(nBytes);

if(nBytes != 2 *N){
     Serial.print("I was expecting 8 bytes");

return;
 }
 unsigned char *p = (unsigned char *)&values;
 for(int i=0;i<2*N;i++){
 *p++ = Wire.read();
 }
 // Increment all the values we received
 for(int i=0;i<N;i++){
 values[i]++;
 }

}

// Callback for when data are read
void requestEvent() {

Serial.println("Data requested");
  // Send back
 Wire.write((const uint8_t*)&values, N*2);
}

</code>
 </pre>
  
    当我在Raspberry Pi上运行Python代码时，我得到：
  
   <pre>
 <code>
 ./i2c.py 
101 201 1001 10001

</code>
 </pre>
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