Three problems in same code - SD.remove and a Serial error?
Posted: Thu May 09, 2019 2:25 pmI have posted some test code I am using below and the output. I have three problems which are possibly linked:
1/ The file is not deleted with SD.remove()
2/ I am getting random serial.prints from other switch statements. It was suggested to me this was a serial/buffer error but no way on how to fix it was suggested.
3/ Not printing the contents of the file
Can anyone shed some light on the problems?
Some comments added here proceeded by *****
1/ The file is not deleted with SD.remove()
2/ I am getting random serial.prints from other switch statements. It was suggested to me this was a serial/buffer error but no way on how to fix it was suggested.
3/ Not printing the contents of the file
Can anyone shed some light on the problems?
Code: Select all
#include <SPI.h>
#include <SD.h>
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = D2;
String dataFile = "TESTDATA.TXT";
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("\nInitializing SD card...");
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card inserted?");
Serial.println("* is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
return;
} else {
Serial.println("Wiring is correct and a card is present.");
}
}
void loop() {
if (Serial.available() > 0) {
char inByte = Serial.read();
Serial.println("inByte = " + inByte);
switch (inByte) {
case 'D': { // Delete the data file
Serial.println("Look for a file called " + dataFile + ", if found remove it");
if (SD.exists(dataFile)) {
Serial.println("File " + dataFile + " found");
if (SD.remove(dataFile)) Serial.println("File successfully deleted");
else Serial.println("Error - file not deleted");
}
if (!SD.exists(dataFile)); {
Serial.println("Following confirmation checks, " + dataFile + " now deleted\r\n");
}
break;
}
case 'I': { // Display card data
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster();
volumesize *= volume.clusterCount();
volumesize *= 512;
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
break;
}
case 'P': {// Print the file to serial
Serial.println("Open a file called " + dataFile + " and read it");
File testfile = SD.open(dataFile, FILE_READ);
while (testfile.available()) {
Serial.write(testfile.read());
}
Serial.println("\r\nCompleted reading from the file\r\n");
testfile.close();
break;
}
default:
Serial.println("No command recived");
}
}
}Some comments added here proceeded by *****
Initializing SD card...Wiring is correct and a card is present. *****FROM START UP AND OK
*****INPUT D INTO THE SERIAL MONITOR
found
Look for a file called TESTDATA.TXT, if found remove it
Following confirmation checks, TESTDATA.TXT now deleted
No command recived *****THIS IS THE OUTPUT FROM THE DEFAULT SWITCH COMMAND
*****INPUT I INTO THE SERIAL MONITOR WOOPS TOOK SOMETHING I SHOULDN'T HAVE OUT OF THE CODE BUT YOU SHOULD GET THE IDEA - THE FILE I WANTED TO DELETE IS STILL ON THE SD CARD
d
Volume type is FAT0
Volume size (bytes): 0
Volume size (Kbytes): 0
Volume size (Mbytes): 0
Files found on the card (name, date and size in bytes):
No command recived
*****INPUT P INTO THE SERIAL MONITOR
successfully deleted
Open a file called TESTDATA.TXT and read it
Completed reading from the file
No command recived