Note that there are two libraries available: SD and SD_MMC. In this introductory tutorial we are going to learn how to mount the card and obtain some simple information, such as the card type or its total capacity.įor that, we will use the Arduino core library that allows to interact with the SD card. Other possible way is wiring the card directly to the ESP32, like shown on this diagram. These modules have a socket for the card and then expose pins that we can connect to the ESP32. Other approach is to use a SD card adapter, which can also be found at eBay for very low prices. In my case, I’m using a HW-818 ESP32 board model, which can be bought at eBay for around 10 Euros (link here). One of the easiest is to use board with a SD card socket, where we can plug our card and start using it right away. It’s important to mention that there are a couple of ways to connect the SD card to the microcontroller. In this tutorial we are going to learn how to interact with a SD card from the ESP32, using the Arduino core. N.B: Don’t forget to set MEGA_SOFT_SPI to 0 when using another Arduino board.In this tutorial we are going to learn how to interact with a SD card from the ESP32, using the Arduino core. You can now operate the SD module of the TFT shield with the Arduino Mega board and use the codes from the previous tutorials. On line 356, modify the definition of the SDClass::begin() function to remove the sdSpiClock line.īoolean SDClass : : begin ( uint32_t clock, uint8_t csPin ) #endif //SOFTWARE_SPI #define USE_SPI_LIB #include #include "Sd2Card.h" //modif mega #ifndef SOFTWARE_SPI //Added to enable use of MEGA #define USE_SPI_LIB #endif //SOFTWARE_SPI //modif mega SD.cpp file #define USE_SPI_LIB #include #include "Sd2Card.h" Then place this line in #if #endif after calling the file Sd2Card.h On line 20, comment out the #define USE_SPI_LIB command. */ #define MEGA_SOFT_SPI 1 //- #if MEGA_SOFT_SPI & ( defined ( _AVR_ATmega1280_ ) || defined ( _AVR_ATmega2560_ ) ) #define SOFTWARE_SPI #endif // MEGA_SOFT_SPI //- // SPI pin definitions // #ifndef SOFTWARE_SPI #define USE_SPI_LIB File Sd2Card.cpp Software SPI works well with GPS Shield V1.1 but many SD cards will fail with GPS Shield V1.0. MEGA_SOFT_SPI allows an unmodified Adafruit GPS Shield to be used on Mega Arduinos. Pins used are SS 10, MOSI 11, MISO 12, and SCK 13. */ //#define USE_SPI_LIB /** Define MEGA_SOFT_SPI non-zero to use software SPI on Mega Arduinos. ** USE_SPI_LIB: if set, use the SPI library bundled with Arduino IDE, otherwise run with a standalone driver for AVR. */ #define MEGA_SOFT_SPI 0 //XW //- #if MEGA_SOFT_SPI & ( defined ( _AVR_ATmega1280_ ) || defined ( _AVR_ATmega2560_ ) ) #define SOFTWARE_SPI #endif // MEGA_SOFT_SPI //- // SPI pin definitions // #ifndef SOFTWARE_SPI // hardware pin defs */ #define USE_SPI_LIB /** Define MEGA_SOFT_SPI non-zero to use software SPI on Mega Arduinos. Line 47, set the MEGA_SOFT_SPI variable to 1, comment on line 38 and place This file is located in the directory, C:\Program Files (x86)\Arduino\libraries\SD\src\utility To make the TFT shield’s SD module compatible, 3 files must be modified: Sd2Card.h, Sd2Card.cpp and SD.cpp. If you don’t want to solder wires on the Arduino, you can modify the code in the SD.h library. The advantage is that you don’t have to delve into the code of the Arduino libraries and you retain the performance of the SPI port. To avoid modifying the code, you can solder the pins according to the following list: In fact, the pins of the SD module are connected to pins 11, 12 and 13 of the Arduino, which corresponds to the SPI port of a UNO but not a Mega (51, 52, 53). However, like most shields, it has been developed for the Arduino UNO and is not compatible with the Arduino Mega. The TFT shield uses the SPI port to communicate with the SD module. We’ll now look at how to modify the SD library to make the SD card module compatible with the Arduino Mega board. We have seen in previous tutorials how to use the shield screen and its SD card module. The TFT shield consists of a touch screen and a micro SD card module which is not compatible with the Arduino Mega board.
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