Hello, I am currently using a NodeMCU,SDCard Module and a UART JPEG Camera. My goal is to snap a picture and then save it into the SDCard. The problem that I am having is that I can take the first picture and save it, but when it comes the 2nd, 3rd, 4th and so on, the picture is not saved into the SDCard.
Below is the code.
//*******************************************************
// 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(D4,D3); // 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 : 160120
/ <2> 0x11 : 320240
/ <3> 0x00 : 640480
/ <4> 0x1D : 800600
/ <5> 0x1C : 1024768
/ <6> 0x1B : 1280960
/ <7> 0x21 : 16001200
/**************/
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);
}
int number = 23;
void SendTakePhotoCmd()
{
mySerial.write(0x56);
mySerial.write(ZERO);
mySerial.write(0x36);
mySerial.write(0x01);
mySerial.write(ZERO);
number = number + 1;
}
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(38400);
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.
pinMode(10, OUTPUT);
if (!SD.begin(D8))
{
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
Serial.println("please waiting ....");
mySerial.begin(115200);
delay(100);
SendResetCmd();
delay(2000);
SetBaudRateCmd(0x2A);
delay(500);
mySerial.begin(38400);
delay(100);
}
void loop()
{
byte a[32];
int ii;
SendResetCmd();
delay(2000); //Wait 2-3 second to send take picture command
SendTakePhotoCmd();
delay(1000);
while(mySerial.available()>0)
{
incomingbyte=mySerial.read();
}
myFile = SD.open(String(number)+"pic.jpg", FILE_WRITE); //The file name should not be too long
while(!EndFlag)
{
j=0;
k=0;
count=0;
//mySerial.flush();
SendReadDataCmd();
delay(20);
while(mySerial.available()>0)
{
incomingbyte=mySerial.read();
k++;
delay(1); //250 for regular
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);
}