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50 lines
1.2 KiB
C++

/*
* Read the logfile created by the eventlog.ino example.
* Demo of pathnames and working directories
*/
#include <SPI.h>
#include "SdFat.h"
// SD chip select pin
const uint8_t chipSelect = SS;
// file system object
SdFat sd;
// define a serial output stream
ArduinoOutStream cout(Serial);
//------------------------------------------------------------------------------
void setup() {
int c;
Serial.begin(9600);
// Wait for USB Serial
while (!Serial) {
SysCall::yield();
}
// Initialize at the highest speed supported by the board that is
// not over 50 MHz. Try a lower speed if SPI errors occur.
if (!sd.begin(chipSelect, SD_SCK_MHZ(50))) {
sd.initErrorHalt();
}
// set current working directory
if (!sd.chdir("logs/2014/Jan/")) {
sd.errorHalt("chdir failed. Did you run eventlog.ino?");
}
// open file in current working directory
ifstream file("logfile.txt");
if (!file.is_open()) {
sd.errorHalt("open failed");
}
// copy the file to Serial
while ((c = file.get()) >= 0) {
cout << (char)c;
}
cout << "Done" << endl;
}
//------------------------------------------------------------------------------
void loop() {}