ARDUINO MEGA 2560 PIN DESCRIPTIONS CODE

It's just pure self-contained code that goes right onto the bare metal, and does everything to drive the display, from initialization to filling the screen with a colour.Īnd it does put the data1,0 bits in PH6,5 as I had expected. It has 54 digital input/output pins (of which 15 can be used as PWM outputs). Here is a dead simple sketch with no libraries, no classes and uses no other code. The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. Upon further investigation, I'm pretty sure that the UTFT code above is wrong. NOTE: Digital pin 13 is harder to use as a digital input than the other digital pins because it has an LED and resistor attached to it thats.

2 digitalWrite(pin, HIGH) // turn on pullup resistors. I would be grateful if someone can explain this apparent contradiction. Prior to Arduino 1.0.1, it was possible to configure the internal pull-ups in the following manner: 1 pinMode(pin, INPUT) // set pin to input. Obviously the code does work, and I'm just not seeing something.

So how can this work? Those 2 bits should go to PH6,5 not PE1,0.įurthermore, PE1,0 are used for TXD and RXD, so those bits can't be used for the display. The shield uses the D9 and D8 pins for these bits, but they are connected to PH6 and PH5. This makes sense except for the two least significant data bits, which the code above is setting into port bits PE1 and PE0. This is done in the UTFT library for the MEGA board, using this code:. Therefore, code that writes to these shields must splatter the data bits to the appropriate AVR port bits, before strobing the shield's WR line. These pins don't connect to a single AVR 8 bit port, but are split amongst 2 or 3 ports. Here you will find all of the technical documentation and support files for the Arduino Mega 2560 Revision 3. On these shields, the 8 data lines for bits 7.0 connect to Arduino pins D7.D2,D9,D8 on both UNO and MEGA. I'm experimenting with TFT LCD display shields designed for UNOs, but which can alsoīe used with the MEGA 2560 board, and I'm confused by an apparent contradiction.

Arduino mega 2560 pin descriptions