学习使用串口相机拍摄jpeg并存入SD卡

//*******************************************************
//              www.linksprite.com 
// Note:
// 1. SD must be formated to FAT16
// 2. As the buffer of softserial has 64 bytes,
//    so the code read 32 bytes each time
// 3. Please add the libaray to the lib path
// 
// * SD card attached to SPI bus as follows:
// * MOSI - pin 11
// * MISO - pin 12
// * CLK - pin 13
// * CS - pin 4
//*******************************************************
#include <SoftwareSerial.h>
#include <SPI.h>
#include <SD.h>
 
SoftwareSerial mySerial(5,6);          // Set Arduino pin 4 and 5 as softserial
 
byte ZERO = 0x00;
byte incomingbyte;
long int j=0,k=0,count=0,i=0x0000;
uint8_t MH,ML;
boolean EndFlag=0;
File  myFile;
 
void SendResetCmd()
{
  mySerial.write(0x56);
  mySerial.write(ZERO);
  mySerial.write(0x26);
  mySerial.write(ZERO);
}
 
/*************************************/
/* Set ImageSize :
/* <1> 0x22 : 160*120
/* <2> 0x11 : 320*240
/* <3> 0x00 : 640*480
/* <4> 0x1D : 800*600
/* <5> 0x1C : 1024*768
/* <6> 0x1B : 1280*960
/* <7> 0x21 : 1600*1200
/************************************/
void SetImageSizeCmd(byte Size)
{
  mySerial.write(0x56);
  mySerial.write(ZERO);
  mySerial.write(0x54);
  mySerial.write(0x01);
  mySerial.write(Size);
}
 
/*************************************/
/* Set BaudRate :
/* <1>　0xAE  :   9600
/* <2>　0x2A  :   38400
/* <3>　0x1C  :   57600
/* <4>　0x0D  :   115200
/* <5>　0xAE  :   128000
/* <6>　0x56  :   256000
/*************************************/
void SetBaudRateCmd(byte baudrate)
{
  mySerial.write(0x56);
  mySerial.write(ZERO);
  mySerial.write(0x24);
  mySerial.write(0x03);
  mySerial.write(0x01);
  mySerial.write(baudrate);
}
 
void SendTakePhotoCmd()
{
mySerial.write(0x56);
mySerial.write(ZERO);
mySerial.write(0x36);
mySerial.write(0x01);
mySerial.write(ZERO);
}
 
void SendReadDataCmd()
{
MH=i/0x100;
ML=i%0x100;
mySerial.write(0x56);
mySerial.write(ZERO);
mySerial.write(0x32);
mySerial.write(0x0c);
mySerial.write(ZERO);
mySerial.write(0x0a);
mySerial.write(ZERO);
mySerial.write(ZERO);
mySerial.write(MH);
mySerial.write(ML);
mySerial.write(ZERO);
mySerial.write(ZERO);
mySerial.write(ZERO);
mySerial.write(0x20);
mySerial.write(ZERO);
mySerial.write(0x0a);
i+=0x20;
}
 
void StopTakePhotoCmd()
{
mySerial.write(0x56);
mySerial.write(ZERO);
mySerial.write(0x36);
mySerial.write(0x01);
mySerial.write(0x03);
}
 
void setup()
{
 
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
 
Serial.print("Initializing SD card...");
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
if (!SD.begin(4)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
Serial.println("please waiting ....");  
}
 
void loop()
{
  byte a[32];
  int ii;       
  mySerial.begin(115200);
  delay(200);
  SendResetCmd();//Wait 2-3 second to send take picture command
  delay(2000);
  SetBaudRateCmd(0x2A);
  delay(100);
  mySerial.begin(38400);
  delay(100);
  SetImageSizeCmd(0x21);
  delay(100);
  SendTakePhotoCmd();
  delay(3000);
  while(mySerial.available()>0)
  {
     incomingbyte=mySerial.read();
  }
  myFile = SD.open("pic.jpg", FILE_WRITE); //<strong><span style="color: #ff0000;">The file name should not be too long</span></strong>
  while(!EndFlag)
  {
    j=0;
    k=0;
    count=0;
    SendReadDataCmd();
    delay(5);
    while(mySerial.available()>0)
    {
      incomingbyte=mySerial.read();
      k++;
      delayMicroseconds(100); 
      if((k>5)&&(j<32)&&(!EndFlag))
      {
        a[j]=incomingbyte;
        if((a[j-1]==0xFF)&&(a[j]==0xD9))     //tell if the picture is finished
        EndFlag=1;
        j++;
       count++; 
      }
     }
 
    for(j=0;j<count;j++)
    {
      if(a[j]<0x10)  Serial.print("0");
      Serial.print(a[j],HEX);           // observe the image through serial port
      Serial.print(" ");
    }
    for(ii=0; ii<count; ii++)
      myFile.write(a[ii]);
    Serial.println();
  }
  myFile.close();
  Serial.print("Finished writing data to file");
  while(1);
}
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