m5-docs/docs/en/api/tf.md

TF card

begin()

Syntax:

boolean begin(uint8_t cspin);

Description:

This function initialize TF card.

Argument	Description	Type
cspin	chip select line (defaults SS line of SPI bus)	uint8_t

Example:

#include <M5Stack.h>

void setup() {
  SD.begin();
}

open()

Syntax:

File open(const char *filename, uint8_t mode = FILE_READ);

Description:

This function open the file.

Argument	Description	Type
filepath	path to file	const char *
mode	read / write / rw (optional)	uint8_t

Example:

/*
display contents of hello.txt in TF card to M5 screen.
*/
#include <M5Stack.h>

void setup() {
  M5.begin();
  if (!SD.begin()) {
    M5.Lcd.println("Card failed, or not present");
    while (1);
  }
  Serial.println("TF card initialized.");
  File f = SD.open("/hello.txt", FILE_READ);
  if (f) {
    M5.Lcd.print(f.read());
    f.close();
  } else {
    M5.Lcd.println("open error hello.txt");
  }
}

void loop() {
}