Hello,
I have a personal project based on file transfer between an Arduino Due and my PC. Theses files are in text format and can go over 10Mb.
I firstly bought an SD SPI module to connect an external SD card to my Arduino and a compatible micro-SD card.
SD card sided, everything works well, the card is detected and data storage is also working.
To transfer data from my PC, I am using Batch scripts that send text file content over Serial port used by Arduino.
The problem comes: I am unable to transfer over 65535 length file over Serial port at once.
If the file contains more than 65535 characters, the transfer stuck and I am unable to do anything until I reset the Arduino card. I tried with a bit more characters, but it only writes firsts characters in the file.
So, if my file does 65635 characters, only the first 100 characters will be written in the new file.
But as I said, my goal is to transfer huge files.
To illustrate my problem I give you some codes on Arduino and Batch scripts.
Arduino part
I launch different states with buttons.
- First one run a "send_file" batch script that will send data to serial port and write into a new file on SD card.
- A second one will run a "read_serial" batch script that will read file content sent over Serial port by Arduino.
- The third one is used to delete the file created before.
Note that I use RGB led for different states, and also Keyboard library to do actions on my computer.
Here is the complete code:
#include <Wire.h>
#include <Keyboard.h>
#include <SPI.h>
#include <SD.h>
File myFile;
const int chipSelect = 53;
String AltGrazerty = "~#{[|`\\^@#]}";
String shiftazerty = "QBCDEFGHIJKL?NOPARSTUVZXYW1234567890 Q+QQQQM%Q./Q>";
String azerty = "qbcdefghijkl,noparstuvzxyw&q\"'(-q_qq )=q$q*mqq;:!<";
const byte scancode[] = { 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 100 };
int BP1 = 28, BP2 = 29, BP3 = 31, BP4 = 30, BP5 = 33, BP6 = 32;
int red_light_pin= 9;
int green_light_pin = 11;
int blue_light_pin = 10;
int ledstate = 0;
int val1 = 0, val2 = 0, val3 = 0, val4 = 0, val5 = 0, val6 = 0, flag = 0;
void setup() {
Serial.begin(115200);
Keyboard.begin();
if (!SD.begin(chipSelect)) {
while (1);
}
myFile = SD.open("test.txt");
while (myFile.available()) {
Serial.write(myFile.read());
}
myFile.close();
Serial.flush();
pinMode(BP1, INPUT_PULLUP);
pinMode(BP2, INPUT_PULLUP);
pinMode(BP3, INPUT_PULLUP);
pinMode(BP4, INPUT_PULLUP);
pinMode(BP5, INPUT_PULLUP);
pinMode(BP6, INPUT_PULLUP);
pinMode(red_light_pin, OUTPUT);
pinMode(green_light_pin, OUTPUT);
pinMode(blue_light_pin, OUTPUT);
}
void loop() {
val1 = digitalRead(BP1);
val2 = digitalRead(BP2);
val3 = digitalRead(BP3);
val4 = digitalRead(BP4);
val5 = digitalRead(BP5);
val6 = digitalRead(BP6);
switch (ledstate){
case 0 : RGB_color(255, 239, 0);
break;
case 1 : RGB_color(255, 0, 0);
break;
case 2 : RGB_color(0, 255, 0);
break;
case 3 : RGB_color(0, 0, 255);
break;
}
if (val1 == 0)
{
if (flag == 0)
{
Keyboard.press(KEY_LEFT_GUI);
Keyboard.press('r');
Keyboard.releaseAll();
delay(250);
Keyfr("C:/Users/***/Desktop/send_data.bat");
delay(500);
Keyboard.press(KEY_RETURN);
Keyboard.releaseAll();
String text = Serial.readString();
myFile = SD.open("test.txt",FILE_WRITE);
if(myFile){
myFile.println(text);
myFile.close();
} else {}
ledstate = 1;
flag = 1;
}
} else if (val2 == 0) {
if (flag == 0) {
Serial.flush();
delay(500);
Keyboard.press(KEY_LEFT_GUI);
Keyboard.press('r');
Keyboard.releaseAll();
delay(250);
Keyfr("C:/Users/***/Desktop/read_data.bat");
delay(500);
Keyboard.press(KEY_RETURN);
Keyboard.releaseAll();
ledstate = 2;
flag = 1;
}
} else if (val3 == 0) {
if (flag == 0) {
Keyboard.press(KEY_LEFT_GUI);
Keyboard.press('r');
Keyboard.releaseAll();
delay(250);
Keyfr("C:/Users/***/Desktop/del.bat");
delay(500);
Keyboard.press(KEY_RETURN);
Keyboard.releaseAll();
myFile = SD.open("test.txt");
if (myFile) {
SD.remove("test.txt");
myFile.close();
} else {}
ledstate = 3;
flag = 1;
}
} else if (val4 == 0) {
if (flag == 0) {
flag = 1;
}
} else if (val5 == 0)
{
if (flag == 0) {
flag = 1;
}
} else if (val6 == 0) {
if (flag == 0) {
flag = 1;
}
} else if (val1 == 1 && val2 == 1 && val3 == 1 && val4 == 1 && val5 == 1 && val6 == 1)
{
flag = 0;
}
delay(50);
}
void Keyfr(const String &Texte) {
int j = -1;
for (unsigned int i = 0; i < Texte.length(); i++) {
char c = Texte.charAt(i);
if (c == '\t') {
Keyboard.write(KEY_TAB);
}
int index = azerty.indexOf(c);
if (index > -1) {
j = scancode[index] + 136;
Keyboard.write(j);
} else {
index = shiftazerty.indexOf(c);
if (index > -1) {
j = scancode[index] + 136;
Keyboard.press(KEY_LEFT_SHIFT);
Keyboard.press(j);
Keyboard.releaseAll();
} else {
index = AltGrazerty.indexOf(c);
if (index > -1) {
j = scancode[index + 27] + 136;
Keyboard.press(KEY_LEFT_CTRL);
Keyboard.press(KEY_LEFT_ALT);
Keyboard.write(j);
Keyboard.releaseAll();
if (index == 0 || index == 7) {
Keyboard.press(KEY_LEFT_CTRL);
Keyboard.press(KEY_LEFT_ALT);
Keyboard.write(j);
Keyboard.releaseAll();
Keyboard.write(KEY_BACKSPACE);
}
}
}
}
}
}
void RGB_color(int red_light_value, int green_light_value, int blue_light_value)
{
analogWrite(red_light_pin, red_light_value);
analogWrite(green_light_pin, green_light_value);
analogWrite(blue_light_pin, blue_light_value);
}
Batch part
I give you in this part only send and read scripts, even if I think theses scripts are not a problem.
Send script :
@echo off
setlocal EnableDelayedExpansion
@echo mode COM5 BAUD=115200 PARITY=n DATA=8
set "cmd=findstr /R /N "^^" file.txt | find C/ ":""
@type file.txt > COM5
Read script :
@echo off
setlocal EnableDelayedExpansion
@mode COM5 BAUD=115200 PARITY=n DATA=8 DTR=ON
set "cmd=findstr /R /N "^^" file.txt | find /C ":""
@type COM5>file2.txt
I hope my problem is understandable and my English is correct (not my primary language).
Thanks in advance.
Romain.
