SD记录数据和串口软件收到的数据不一样，少了0

suoma

串口软件收到的数据和SD卡记录的数据不一样，SD中少了0，不知道什么原因？还请分析一下

程序，串口缓冲区大小修改为20

1. File myFile;
   
2. //char data;
   
3. //int firstSensor = 0;    // first analog sensor
   
4. //int secondSensor = 0;   // second analog sensor
   
5. //int thirdSensor = 0;    // digital sensor
   
6. byte inByte;         // incoming serial byte
   
7. //String Byte="";
   
8. void setup()
   
9. {
   
10.   // start serial port at 1200 bps,EVEN check,2 stop bit
    
11.   Serial.begin(1200,SERIAL_8E1);
    
12.   /*while (!Serial) {
    
13.     ; // wait for serial port to connect. Needed for Leonardo only
    
14. }*/
    
15.   pinMode(10, OUTPUT);
    
16.    
    
17.   if (!SD.begin(4)) {
    
18.     //Serial.println("initialization failed!");
    
19.     return;
    
20.   }
    
21.   //pinMode(2, INPUT);   // digital sensor is on digital pin 2
    
22. // establishContact();  // send a byte to establish contact until receiver responds
    
23. }
    
24. 
    
25. void loop()
    
26. {
    
27.   int i;
    
28.   if (Serial.available() > 0) {
    
29.    inByte=Serial.read();
    
30.    myFile = SD.open("test10.txt", FILE_WRITE);
    
31.    if (myFile)
    
32. 
    
33.     {
    
34.     // get incoming byte:
    
35.    
    
36.     // read first analog input, divide by 4 to make the range 0-255:
    
37.     //firstSensor = analogRead(A0)/4;
    
38.     // delay 10ms to let the ADC recover:
    
39.     //delay(10);
    
40.     // read second analog input, divide by 4 to make the range 0-255:
    
41.     //secondSensor = analogRead(1)/4;
    
42.     // read  switch, map it to 0 or 255L
    
43.     //thirdSensor = map(digitalRead(2), 0, 1, 0, 255);  
    
44.     // send sensor values:
    
45.    // Serial.write(firstSensor);
    
46.    // Serial.write(secondSensor);
    
47.    //for(i=0;i<20;i++)
    
48.    //{
    
49.      Serial.println(inByte,HEX);
    
50.     myFile.println(inByte,HEX); ///myFile.println(inByte,HEX);
    
51.    //}
    
52.    myFile.close();
    
53.    //delay(100);
    
54.    while(Serial.read() >= 0)
    
55.    {}
    
56.    Serial.println();
    
57.    Serial.println(Serial.available());
    
58.      //Serial.print(Serial.read());
    
59.    }
    
60.    delay(100) ;   
    
61.   }
    
62. }

复制代码

Super169

0 是來自這裡的:
   Serial.println(Serial.available());

suoma

Super169 发表于 2016-9-9 10:16
0 是來自這裡的:
   Serial.println(Serial.available());

谢谢，明白了