Hi
I have a simple question.
Can someone tell me where I can find the commands I can use with a library.
By example: which commands can I use with the SD library.
Where can I find them?
Thanks
Ptr
in the source code of the library
And where can I find the 'source code of the lib'?
You could start at the Arduino reference: SD - Arduino Reference
in the "libraries" directory of your Arduino installation
Thanks 'johnwasser' and 'b707'.
I know what I wanted to know.
Greetings,
Ptr
Hi,
Also look at any Example codes that may come with the library.
Tom... 
For thanks you can use the Like button 
Unless the library is built-in, like the SD library. Then it becomes more complicated. The easy way is to turn on
Preferences... -> Show verbose output during: [X]compilation [ ]upload
The location of the library source files will show up in the build process.
Hmm. Disappointed.
I was looking for 'SD2Card' but it is no command?
I get the error during compiling: 'SD2Card does not name a type'.
In the sample is written: Sd2Card card;
greetings
Please post the full sketch.
Please post the full error message.
It's not SD2Card but Sd2Card and is a class in the SD library.
Sorry for the mismatch. Of course SdCard.
The sketch is the sample that you find by Samples-SD. The sample 'Read/Write' gives no problem. But the sample that gives information of the SD card gives the failure.
Not only by 'Sd2Card card' but also by
'SdVolume volume' and
'SdFile root'.
What do you mean by 'is a class'?
And here is the code
SD card test
This example shows how use the utility libraries on which the'
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#include <SPI.h>
#include <SD.h>
#include <FS.h>
//#define SD_RST D3
//#define SD_DC D4
#define SD_SCK D5
#define SD_MISO D6
#define SD_MOSI D7
#define SD_CS D8
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
//const int chipSelect = D2;
//#define _cs D2
void setup()
{
// pinMode(_cs, OUTPUT);
// digitalWrite(_cs, HIGH);
// Open serial communications and wait for port to open:
Serial.begin(115200);
// SPIClass spi = SPIClass(VSPI);
// spi.begin(SCK, MISO, MOSI, CS);
}
if (!SD.begin(CS) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE){
Serial.println("No SD card attached");
return;
}
// while (!Serial) {
// ; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("\nInitializing SD card...");
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
pinMode(D8, OUTPUT); // change this to 53 on a mega
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_QUARTER_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card is inserted?");
Serial.println("* Is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
// return;
// } else {
Serial.println("Wiring is correct and a card is present.");
// }
// print the type of card
Serial.print("\nCard type: ");
switch (card.type()) {
case
SD_CARD_TYPE_SD1:
Serial.println("SD1");
break;
case
SD_CARD_TYPE_SD2:
Serial.println("SD2");
break;
case
SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
break;
default:
Serial.println("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize *= 512; // SD card blocks are always 512 bytes
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
void loop(void) {
}`
That code does not compile for a few reasons
- You're missing the opening /* for the comment
- A misplaced } before
if (!SD.begin(CS); that } indicates the end of setup() and should be just before loop(). - It does not know about CS in
if (!SD.begin(CS); it probably needs to be SD_SCK instead of CS.
I stopped after that. Fix those errors and you might get there.
Which board are you using? I suspect an ESP type board; if I compile an original SD library example (CardInfo) for an ESP8266 I indeed get an error about Sd2Card; for an Uno there is no error.
I'm not familiar enough with the ESP world; you'll have to wait till somebody comes along with sufficient knowledge in that area.
Hoi Sterretje
Answer 1 and 2 are correct in the original code ( it was the first time I had to upload the code and aomething went wrong).
I tried answer 3 but it did not solve the problem.
Indeed I use a wemos D1 8266 so I'll have to wait.
Thanks for your help.
Ptr