/* STM32 Blue Pill - SD Card Test with SdFat.h (Simulation 10.2) - API Corrected */

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

const int chipSelectPin = PA4; 

SdFs sd; 
FsFile myFile;

#define SD_SPI_SPEED SD_SCK_MHZ(4) // Start with a moderate speed for simulation

void setup() {
  Serial.begin(115200);
  Serial.println("\nInitializing SD card (Corrected SdFat) for Sim 10.2...");

  if (!sd.begin(chipSelectPin, SD_SPI_SPEED)) { 

    Serial.println("************************************************************");
    Serial.println("ERROR: SD Card initialization failed!");
    Serial.print("SdFat Error Code: 0x"); Serial.print(sd.sdErrorCode(), HEX); // Get general error code
    Serial.print(", Error Data: 0x"); Serial.println(sd.sdErrorData(), HEX);   // Get specific error data
    // sd.printSdError(&Serial); // This function should still work and provide a text description
    Serial.println("Please check wiring, SD card presence in Wokwi, and libraries.txt (needs 'SdFat').");
    Serial.println("************************************************************");
    while (1); 
  }
  Serial.println("SD Card initialized successfully with SdFat.h.");

  // Optional: Print volume information
  Serial.println("\n--- Volume Information ---");
  Serial.print("Volume Type: ");
  switch (sd.fatType()) {
    case FAT_TYPE_FAT12: Serial.println("FAT12"); break;
    case FAT_TYPE_FAT16: Serial.println("FAT16"); break;
    case FAT_TYPE_FAT32: Serial.println("FAT32"); break;
    case FAT_TYPE_EXFAT: Serial.println("exFAT"); break;
    default: Serial.println("Unknown"); break;
  }
  uint32_t volumeSizeMB = sd.vol()->clusterCount() * sd.vol()->sectorsPerCluster() * 512 / (1024 * 1024);
  Serial.print("Volume Size: "); Serial.print(volumeSizeMB); Serial.println(" MB");
  Serial.println("--- End Volume Information ---");


  Serial.println("\n--- Root Directory Listing ---");
  // sd.ls(&Serial, LS_R | LS_DATE | LS_SIZE); // Recursive with details
  if (!sd.ls(&Serial, LS_SIZE)) { // List with size, non-recursive for root
      Serial.println("sd.ls() failed or root directory is empty/unreadable.");
  }
  Serial.println("--- End of Listing ---");


  Serial.println("\nAttempting to open 'test.txt' from SD card...");
  if (!myFile.open("test.txt", O_RDONLY)) { // O_RDONLY for read-only
    Serial.println("************************************************************");
    Serial.print("ERROR: Failed to open 'test.txt'!");
    Serial.print(" SdFat Error Code after open attempt: 0x"); Serial.println(sd.sdErrorCode(), HEX); 
    // sd.printSdError(&Serial); // Can also print the text error here

    if (!sd.exists("test.txt")) { 
        Serial.println(" -> File 'test.txt' does not exist on SD card root (sd.exists confirms).");
    } else {
        Serial.println(" -> File 'test.txt' exists (sd.exists confirms), but could not be opened.");
    }
    Serial.println("************************************************************");
    return; 
  }
  Serial.println("'test.txt' opened successfully. File contents:");
  Serial.println("-------------------------------------------");

  int data_byte; 
  while ((data_byte = myFile.read()) >= 0) { 
    Serial.write((char)data_byte);
  }
  Serial.println("\n-------------------------------------------");
  Serial.println("Finished reading from 'test.txt'.");

  myFile.close();
  Serial.println("'test.txt' closed.");
  
  Serial.println("\nEnd of SD Card Test Sim 10.2 with SdFat.h.");
}

void loop() {
  delay(1000); 
}