Description
Hi,
I am trying to create a new file for writing on an SD card from my Pico using:
myFile = SD.open("example.txt", FILE_WRITE);
I can successfully initialize the SD Card reader and can open a file for reading and read the data OK but cannot create a new file with the FILE_WRITE command.
I am using code based on the example file known as Files.ino within the Arduino IDE with core ver 1.8.4. I have slightly modified the file to configure the pins for the SPI bus. The fact that I can initialize and read files means the SPI bus is working ok.
Below is the example code I am using and the result is shown further down:
/*
SD card basic file example
*/
#include <SPI.h>
#include <SD.h>
File myFile;
void setup() {
delay(5000); //This delay is just to give time for user to open Serial Monitor window
//after uploading the sketch
//Configure pins for SPI comms to SD card when used with Raspberry Pi Pico.
SPI.setRX(0); // MISO
SPI.setCS(1);
SPI.setSCK(2);
SPI.setTX(3); // MOSI
// Open serial communications and wait for port to open:
Serial.begin(115200);
Serial.print("Initializing SD card...");
if (!SD.begin(1)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
if (SD.exists("example.txt")) {
Serial.println("example.txt exists.");
} else {
Serial.println("example.txt doesn't exist.");
}
// open a new file and immediately close it:
Serial.println("Creating example.txt...");
myFile = SD.open("example.txt", FILE_WRITE); // I expected this to create a new file but it didn't in core ver 1.8.4
myFile.close();
// Check to see if the file exists:
if (SD.exists("example.txt")) {
Serial.println("example.txt exists.");
} else {
Serial.println("example.txt doesn't exist.");
}
// delete the file:
Serial.println("Removing example.txt...");
SD.remove("example.txt");
if (SD.exists("example.txt")) {
Serial.println("example.txt exists.");
} else {
Serial.println("example.txt doesn't exist.");
}
}
void loop() {
// nothing happens after setup finishes.
}
The result I am getting is
