![]() So to jump right in, the first thing we do in the code is include the libraries that we will be using as shown below. The code will also be attached in a zip file at the end of this post. The aim of this code is to basically show us the functions that can be performed with the SD card module, including read, write, etc.Īs usual, I will do a breakdown of the code here, and will then drop the full code at the end. It is one of the libraries that comes with the the installation of the IDE. The code for this tutorial will be based on the standard SD.h arduino library. To further highlight the connection made in the fritzing schematics above, below is a pin map of the connection between the SD card and the Arduino Uno The SPI pins on an Arduino differs from one arduino to the other, but on the UNO which was used for this project, it is found between pin 10 to 12. N.B: Don’t forget to set MEGA_SOFT_SPI to 0 when using another Arduino board.The SD card module as earlier stated, communicates with the arduino over the SPI (serial Peripheral interface) communication protocol and it is connected to the arduino hardware SPI pins. 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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