Earle F. Philhower, III
4e50fe866a
Pull in the ESP8266 File/Dir/etc. filesystem and port LittleFS and SD/SDFS to the RP2040. See https://arduino-esp8266.readthedocs.io/en/latest/filesystem.html for more information
62 lines
1.3 KiB
Arduino
62 lines
1.3 KiB
Arduino
/*
|
|
SD card file dump
|
|
|
|
This example shows how to read a file from the SD card using the
|
|
SD library and send it over the serial port.
|
|
|
|
The circuit:
|
|
SD card attached to SPI bus as follows:
|
|
** MISO - pin 0
|
|
** MOSI - pin 3
|
|
** CS - pin 1
|
|
** SCK - pin 2
|
|
|
|
created 22 December 2010
|
|
by Limor Fried
|
|
modified 9 Apr 2012
|
|
by Tom Igoe
|
|
|
|
This example code is in the public domain.
|
|
|
|
*/
|
|
|
|
#include <SPI.h>
|
|
#include <SD.h>
|
|
|
|
const int chipSelect = 4;
|
|
|
|
void setup() {
|
|
// Open serial communications and wait for port to open:
|
|
Serial.begin(115200);
|
|
|
|
Serial.print("Initializing SD card...");
|
|
|
|
// see if the card is present and can be initialized:
|
|
if (!SD.begin(chipSelect)) {
|
|
Serial.println("Card failed, or not present");
|
|
// don't do anything more:
|
|
return;
|
|
}
|
|
Serial.println("card initialized.");
|
|
|
|
// open the file. note that only one file can be open at a time,
|
|
// so you have to close this one before opening another.
|
|
File dataFile = SD.open("datalog.txt");
|
|
|
|
// if the file is available, write to it:
|
|
if (dataFile) {
|
|
while (dataFile.available()) {
|
|
Serial.write(dataFile.read());
|
|
}
|
|
dataFile.close();
|
|
}
|
|
// if the file isn't open, pop up an error:
|
|
else {
|
|
Serial.println("error opening datalog.txt");
|
|
}
|
|
}
|
|
|
|
void loop() {
|
|
}
|
|
|