/* Nucleo-L031K6 - SD Card Test with SdFat.h (Simulation 10.2) - MINIMAL SERIAL */

#include <SdFat.h>
#include <SPI.h> 

#define SPI_SPEED SD_SCK_MHZ(4) 
const uint8_t SD_CS_PIN = D10;  

SdFs sd; 
FsFile myFile;

void setup() {
  Serial.begin(115200);
  delay(100); // Short delay for serial init
  if (!sd.begin(SdSpiConfig(SD_CS_PIN, DEDICATED_SPI, SPI_SPEED))) { 
    Serial.println(F("SD.begin FAIL")); // Concise error
    while (1); 
  }
  Serial.println(F("SD OK"));

  Serial.println(F("\nRoot LS:"));
  if (!sd.ls(&Serial, LS_SIZE /*, LS_DATE | LS_SIZE */)) { // Simpler ls
  }
  Serial.println(F("\nOpen test.txt..."));
  if (!myFile.open("test.txt", O_RDONLY)) { 
    Serial.println(F("Open FAIL"));
    return; 
  }
  Serial.println(F("Open OK. Content:"));
  int data_byte; 
  while ((data_byte = myFile.read()) >= 0) { 
    Serial.write((char)data_byte);
  }
  Serial.println(); 

  myFile.close();
}
void loop() {
  delay(5000); 
}