![]() ![]() I wish you the best of luck! I'm a big fan of tweaking the core. But it may have already knocked these ideas on their head. My plans will hopefully shave a few more instructions off into compile time. Teensyduino has a variation that really squeezes the best possible speed out of the functions. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. I have no idea how it handles a variable value. If pin is a variable the "old" function is used. Grazie al buon Alberto Pighixx, abbiamo a disposizione dei diagrammi dalla grafica. Pighixxx, from the Arduino forum, has created several. I think it's three (six if interrupts are disabled) machine instructions if the port is in "high" memory (only applicable to the 1280 family). Useful Arduino & ATMega microcontrollers pinout diagrams Arduino Blog. One machine instruction if the pin and value are constants and the port is in "low" memory. I need to test it and see how much runtime code is generated to do its final port manipulation. The digitalWriteFast looks great, in fact it was a really great read. PROGMEM tells the linker to place the declaration exclusively in Flash. They use Flash (section of memory where code is stored).Īlso those arrays I posted above use the PROGMEM keyword. Thanks for the reply, I am still learning about arduino, but as these macros below are used by 'pinMode' and stuff, does this not mean the use EEPROM? This will allow me to at least remove some arrays listed below and remove the PROGMEM access overhead. I want to try and create a more efficient set of functions replicating the 'pinMode', 'digitalRead', 'digitalWrite', etc. I believe there are plans to use the end of the EEPROM for network configuration on future boards. The same is true for the Uno revisions.Īlso does anybody know how much EEPROM is taken up by the core? Which means the MEGA 1280, MEGA 2560, MEGA ADK all have the same pin to port/bit mapping. For comparison, here's the official photograph from top above again from the Arduino store: Let's model them in Systems Modeling Language v1 (SysML) using the MagicDraw. indicates that the 12 have the same datasheet so they are in the same family. For those please inspect also the 4-page Official: Arduino Mega2560Rev3: Pinout diagrams (PDF), which you may wish to load in your PDF viewer as you work through this trail. I recently build a Pool light, that has 5 3W RGB LEDs that are all individually controlled by 15 PWM Pins on an Arduino Mega 1280, since each LED had 4 pins, and instead of all Cathodes (-), all Anodes (+) where connected together (i figured this is probrally for when you want/need to control the RGB Pins with Transistors, since Transistors usually control ground), the brightness i've got from the Arduino Pins directly (witch are limited to about 40 mA) was enough for my, or lets say i didn't think it was worth it to have to use 15 Transistors and on top of that even have to heat sink the LEDs, anyhow, since i wanted them to PWM fade the LEDs between different colors i connected the + pin from each LED to 5V and each - pin to a digital pin (witch supports PWM of course), and since the 0 to 255 brightness in this case was obviously inverted since i was controlling the - poles instead of the + poles, i just did something like analogWrite(pin, map(brightness, 0, 255, 255, 0)) witch works fine.Does the MEGA 1280, MEGA 2560, MEGA ADK have the same port register layouts?Īnd the same question for the Uno revisions.Īs far as I know, the layouts are by processor family. that connector (JP5) is not connected to ATMEGA2560 but to ATMEGA16U2 which deals with the usb serial communication to the main. Ok, so i'm having a really awkward problem here. ![]()
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