I link the pins like this:
MicroSD card Adapter -> Teensy4.0
CS -> PIN 10
SDK -> PIN 13
MOSI -> PIN 11
MOSO -> PIN 12
VCC -> 3v
GND -> GND
why in the tool -> port I got on COM4(teenst3.2/3.1) ? when I select this port I got on initialization failed!
And when select COM4 serial(Teensy4.0) I got on " Error opening serial port 'usb:0/140000/0/3'. (Port busy) "
What is the error?
This is my code:
#include <SD.h>
File myFile;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("Initializing SD card... \n");
if (!SD.begin()) {
Serial.println("initialization failed! \n");
return;
}
Serial.println("initialization done. \n");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...\n");
myFile.println("testing 1, 2, 3.");
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt \n");
}
// re-open the file for reading:
myFile = SD.open("test.txt");
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
void loop()
{
// nothing happens after setup
}