hspi_sd_card

#include "PCF8574.h"
PCF8574 pcf8574(0x20);
byte pinWDT = P7;
byte pinLED = P4;

bool stateWDT = 0;

#include "FS.h"
#include "SD.h"
#include "SPI.h"
SPIClass spiSD(HSPI);
#define SD_CS 14
#define SDSPEED 27000000
File root;

unsigned long cur_time, old_time ;
bool stateLed = 0;
const byte wdtPin =  12;
const byte ledPin =  13;

bool wdtState = LOW;
bool ledState = LOW;

void setup() {
  Serial.begin(115200);
  Serial.println("init pcf: ");
  pcf8574.pinMode(pinWDT, OUTPUT);
  pcf8574.pinMode(pinLED, OUTPUT);
  if (pcf8574.begin()) {
    Serial.println("OK");
  } else {
    Serial.println("KO");
  }
  delay(100);

  spiSD.begin(12, 2, 15, SD_CS); //SCK,MISO,MOSI,ss
  while (!SD.begin( SD_CS, spiSD, SDSPEED)) {
    // if(!SD.begin()){
    Serial.println("Card Mount Failed");
    delay(1000);
  }
  Serial.println("found SD card");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("SD card Done");

}

void loop() {
  cur_time = millis();
  if (cur_time - old_time >= 1000) {
    Serial.println("loop function");
    seed_wdt();
    old_time = cur_time;
  }
}

void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}


void seed_wdt() {
  stateWDT = !stateWDT;
  pcf8574.digitalWrite(pinWDT, stateWDT);
  pcf8574.digitalWrite(pinLED, stateWDT);
}